Patent Description:
The contents described below are only described to provide background information related to embodiments of the present invention, and the contents described do not naturally constitute the related art.

The concept of a laundry apparatus includes a laundry treating apparatus such as, specifically, a washer for washing clothes and a dryer for drying wet clothes after washing.

The washer includes a water tub for accommodating washing water, a rotating tub which rotates inside the water tub, a pulsator which rotates inside the rotating tub, and a motor which provides a rotational force to the rotating tub and the pulsator.

When laundry is put into the rotating tub, the laundry accommodated inside the rotating tub is stirred with the washing water by rotation of the pulsator and the rotating tub which are rotated by the motor. As a result, contaminants in the laundry are removed.

The motor of the washer is axially connected to the pulsator and transmits the rotational force to the pulsator to rotate the pulsator. In addition, the motor of the washer selectively transmits the rotational force to the rotating tub through clutch operation and rotates the rotating tub. As described above, in the washer, the rotation operation of the pulsator and the rotation operation of the rotating tub may be selectively used to implement operation of a washing mode and a spin-drying mode.

In addition, an outer rotor type motor may be used in a laundry apparatus such as a washer.

The outer rotor type motor is a motor having an outer rotor. In other words, the outer rotor type motor is a motor having a form in which a rotor rotates outside a stator, and the inertia of the rotor is large, which is advantageous for constant-speed rotation and has an advantage of being suitable for high-speed operation.

In addition, in the outer rotor type motor, a magnet of the rotor may be large. Accordingly, the outer rotor type motor has an advantage of being able to generate a large torque.

For example, a shaft driving a washer, that is, a washing shaft, is connected to a rotor, and the washing shaft directly receives a rotational force of the rotor and rotates.

Recently, with a trend of increasing the capacity of household appliances, the need for high-efficiency motors used in laundry apparatuses such as washers and the like is increasing. Accordingly, a rotor frame included in a motor should secure the rigidity of the motor itself and also should have a heat dissipation function by dissipating heat generated by the motor.

In order to secure a heat dissipation function of a motor, an air inlet and a blade may be formed on a rotor frame facing a lower portion of a coil. However, when the blade is formed, a coil winding space is additionally required to secure a volume of the coil. Accordingly, there is a problem that a size of the motor, for example, a height of the motor, is increased.

In other words, an increase in a protruding height of the blade is important to increase the heat dissipation performance of the motor, but it is difficult to increase the height of the blade to a satisfactory level due to a height constraint of the motor.

When the blade protruding to a predetermined height from a lower inner side of a rotor frame toward the lower portion of the coil is omitted, the volume of the coil may be secured at the required level. However, when the blade is omitted, rotation of an airflow introduced through an air inlet is not induced, and thus there is a problem that a heat dissipation characteristic of the motor is significantly degraded.

As the related art related to the present invention, <CIT> (Related Art <NUM>) discloses a motor and a washer in which the motor is installed.

A motor disclosed in Related Art <NUM> has a structure in which a cooling hole is formed in a lower side surface of a rotor cup (that is, a frame), and a lower blade is formed as a backward-type to increase a speed of cold air in a radially outward direction from a center of the rotor cup (that is, the frame). In addition, the motor has a heat dissipation structure in which a vent is formed in a side surface of the rotor cup (that is, the frame) so that air smoothly flows through the cooling hole and the vent to improve the heat dissipation performance of a lower side of a stator.

However, in the motor disclosed in Related Art <NUM>, a plurality of the blades are positioned in a portion facing a lower portion of a coil in the frame (that is, the rotor cup). Accordingly, an additional coil winding space is required in order to secure a volume of the coil required to improve the performance of the motor. Accordingly, an overall height of the motor is increased, and thus it is difficult to satisfy the compactness and high-efficiency of the motor.

In addition, a blade structure applied to a heat dissipation structure of the motor disclosed in Related Art <NUM> is a backward-type structure of which a mold becomes complicated in order to form the backward-type blade inside the frame, and thus the motor has a disadvantage of poor manufacturability.

In addition, the backward-type blade structure disclosed in Related Art <NUM> has a disadvantage that it is difficult to increase the number of parts applied to the frame having a constant area. In addition, when there are many teeth, coils may be wound at several positions, and in this case, there is a problem that the cooling performance between the coils may be degraded.

In addition, since the heat dissipation structure of the motor disclosed in Related Art <NUM> is not a structure which guides a flow of air for cooling toward the coil, there is a disadvantage that it is insufficient to improve the heat dissipation performance of the motor.

As another related art related to the present invention, <CIT> (Related Art <NUM>) discloses a rotor structure of a motor for a drum washer.

In a rotor structure of a motor disclosed in Related Art <NUM>, a long hole is radially formed in a bottom portion of a rotor, and a blade is provided in the long hole.

However, in the case of the rotor of Related Art <NUM>, the blade is disposed to face a lower portion of a coil, and due to a height of the blade, a winding space of the coil should be further secured to secure a volume of the coil. Accordingly, an overall height of the motor increases. Accordingly, it is difficult to satisfy the compactness and high-efficiency of the motor.

In addition, in the rotor of Related Art <NUM>, since there is a limit in height of the blade in order to secure the winding space of the coil, there is a limit to improving the heat dissipation performance of the motor.

As still another related art related to the present invention, <CIT> (Related Art <NUM>) discloses a laundry device.

A rotor disclosed in Related Art <NUM> includes a plurality of heat dissipation holes and a blade which guides air to the plurality of heat dissipation holes.

However, in the case of the rotor of Related Art <NUM>, the heat dissipation holes and the blade are formed at a base portion (that is, a lower portion of a frame) of the rotor and are positioned to face a winding space of a coil.

Accordingly, there are problems that a height of the blade is constrained, and when the blade protrudes to a required height, a height of the motor should be increased as much as necessary to secure the winding space of the coil.

In addition, in the case of the rotor disclosed in Related Art <NUM>, since the rotor does not have a structure which guides a flow of air, which is suctioned when the blade rotates, toward the coil, there is a disadvantage that it is insufficient to improve the heat dissipation performance of the motor by cooling the coil.

In addition, in Related Art <NUM>, since the heat dissipation holes are formed long in a radial direction of the base portion of the rotor, there is a disadvantage that it is difficult to secure the rigidity of the rotor.

Accordingly, in an outer rotor type motor having an outer rotor, a structural improvement that an air inlet and a blade are provided in a lower portion of a rotor frame to secure a winding space of a coil to increase a volume of the coil while improving the cooling performance of the motor is required.

<CIT> relates to a structure for cooling a motor, <CIT> relates to an integrated direct drive motor and control, <CIT> relates to a motor, <CIT> relates to an outer rotor of a motor for a direct drive-type washing machine, <CIT> relates to a washing machine drive system and washing machine, and <CIT> relates to a washing machine.

The invention is specified by the independent claim <NUM>. The present invention is directed to providing a motor for a laundry apparatus in which a blade having a predetermined height is formed at a lower portion of a rotor frame so as not to affect a winding space of a coil, and thus a volume of the coil is increased to improve the output and efficiency of the motor and the heat dissipation performance of the motor at the same time in an outer rotor type motor having an outer rotor.

The present invention is directed to providing a motor for a laundry apparatus in which a blade is aligned to be biased to one side of an air inlet in consideration of a rotation direction of the rotor so that air, which is suctioned by a vortex generated when the blade rotates, flows toward a coil, in an outer rotor type motor having an outer rotor.

The present invention is directed to providing a motor for a laundry apparatus in which an inclined surface is formed at an upper end of a blade to guide a flow of air toward a coil when the blade rotates, in an outer rotor type motor having an outer rotor.

The present invention is directed to providing a motor for a laundry apparatus in which a width of one end portion of a hole close to a coil is greater than a width of the other end portion of a hole close to a center of a rotor frame so that an air intake volume is increased and a constant distance between the holes is maintained, in an outer rotor type motor having an outer rotor.

The objectives of the present invention are not limited to the above-mentioned objectives, and the other objectives and advantages of the present invention which are not mentioned may be understood through the description below and will be more clearly understood by embodiments of the present invention. In addition, it may be easy to see that the objectives and the advantages of present invention may be realized by the means defined in the claims and their combinations.

According to one aspect of the present invention, in an outer rotor type motor having an outer rotor, a motor for a laundry apparatus in which a blade having a predetermined height is formed in a lower portion of a rotor frame so as not to affect a winding space of a coil can be provided. Accordingly, the heat dissipation performance of the motor can be improved while improving the output and efficiency of the motor by increasing a volume of the coil.

According to another aspect of the present invention, blades can be arranged to be biased on one side of the air inlet in consideration of the rotation direction of the rotor to provide a motor for a laundry apparatus in which air suctioned by a vortex generated during rotation of the blades can flow toward the coil. Accordingly, the cooling of the coil is easier, which can improve the heat dissipation performance of the motor.

According to still another aspect of the present invention, a motor for a laundry apparatus in which an inclined surface is formed at an upper end of a blade to guide a flow of air toward a coil when the blade rotates can be provided. Accordingly, since the coil is easily cooled, the heat dissipation performance of the motor can be improved.

According to yet another aspect of the present invention, a motor for a laundry apparatus in which, when compared to a width of one end portion of a hole close to a coil, a width of the other end portion of the hole close to the coil is greater than the width of the one end portion in an air inlet so that an air intake volume of air is increased and a constant distance between holes is maintained. Accordingly, the rigidity of the rotor frame can be secured while improving the heat dissipation performance of the motor.

A motor for a laundry apparatus according to an embodiment of the present invention includes a stator and a rotor.

The stator includes a core having an annular shape and a coil wound around the core.

The rotor includes a magnet disposed outside the stator with an air gap interposed therebetween and a rotor frame which fixes the magnet and rotates outside the stator.

In a motor for a laundry apparatus according to an embodiment of the present invention, a rotor frame includes a base frame, an extension frame, an air inlet, and a blade.

The base frame refers to a frame having a circular shape which is disposed to face a coil with a distance therebetween.

The extension frame refers to a circular tubular frame which protrudes from an edge of the base frame in a circumferential direction. A plurality of magnets are fixed in an inner circumferential surface of the extension frame. The plurality of magnets may be disposed to surround the inner circumferential surface of the extension frame in the circumferential direction.

The air inlet is formed to pass through the base frame in a thickness direction, air of the outside of the motor is suctioned into the motor through the air inlet.

The blade refers to a plate-shaped structure disposed close to the air inlet. The blade is installed to stand in a direction intersecting one surface of the base frame to protrude to a set height from the base frame.

The blade is positioned outside a region in which the coil is disposed to face the base frame. In the case of an outer rotor type motor having an outer rotor which is a rotor in which a rotor frame rotates outside a stator, there is a disadvantage that a winding space of a coil is reduced as much as a protruding height of a blade protruding upward from a base frame. Because of this, according to the embodiment of the present invention, the blade having a predetermined height can be formed at a position outside the region in which the coil is disposed to face the base frame so as not to affect a winding space of the coil. Accordingly, the winding space of the coil, which is a height space in which the coil is wound inside the motor, may be sufficiently secured so that the output and efficiency of the motor can be improved by increasing a volume of the coil and the heat dissipation performance of the motor can be improved by sufficiently increasing the height of the blade at the same time. In addition, according to the embodiment of the present invention, the height of the blade can be sufficiently increased while increasing the volume of the coil without increasing a height of the motor.

The air inlet includes a plurality of holes formed inside the base frame.

In addition, the air inlet includes a plurality of holes formed inside the base frame, and the plurality of holes is radially arranged in the base frame around a center of the base frame. The plurality of holes is formed long in a radial direction of the base frame.

The rotor frame further includes a plurality of beads convexly formed on one surface of the base frame, and the plurality of beads may be positioned outside the region in which the coil is disposed to face the base frame.

The plurality of beads refers to a structure which has an uneven shape that reinforces the strength of the rotor frame. In the rotor frame, more specifically, in the base frame constituting the rotor frame and having a circular shape, a phenomenon of distortion or elliptical deformation due to centrifugal force may occur due to high-speed rotation. The plurality of beads reinforce the strength of the base frame to prevent such structural deformation.

Each of the plurality of beads may have a shape convexly protruding in a thickness direction of the base frame, and preferably, the plurality of beads may be positioned outside a space in which the coil is wound, that is, the region in which the coil is disposed to face the base frame. Accordingly, the winding space of the coil can be prevented from being reduced as much as a protruding height of the bead to prevent the volume of the coil from being reduced. As a result, the height space at which the coil is wound inside the motor can be sufficiently secured, and thus the output and efficiency of the motor can be improved by increasing the volume of the coil.

The plurality of beads may be radially arranged on the base frame around the center of the base frame. In addition, the plurality of beads may be formed long in the radial direction of the base frame.

In a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes may be radially arranged in the base frame around a center of the base frame and formed long in a radial direction of the base frame. In this case, each of the plurality of holes may be formed to be spaced a predetermined distance from one of two sides of each of a plurality of beads.

In a motor for a laundry apparatus according to an embodiment of the present invention, a rotor frame further includes a plurality of beads convexly formed on one surface of a base frame. In this case, one end portion of each of the plurality of beads may extend to be closer to a center of the base frame in a radial direction of the base frame than an air inlet. The other end portion of each of the plurality of beads may be shorter than a radius of the base frame and thus may be positioned outside a region in which a coil is disposed to face the base frame.

In a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes may be radially arranged in the base frame around a center of the base frame and formed long in a radial direction of the base frame. In this case, a blade may be longitudinally connected to each of the plurality of holes in a longitudinal direction and may have a plate shape protruding to a set height.

A length of the blade may be smaller than a length of each of the plurality of holes.

In a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes may be radially arranged in the base frame around a center of the base frame and may be formed long in a radial direction of the base frame. In this case, a blade may be disposed to be biased to one side of two sides of each of the plurality of holes in a longitudinal direction.

In this case, a biased position of the blade may be determined according to a rotation direction of a rotor. For example, when a rotor frame rotates clockwise, the blade may be aligned to be biased to a left side of the two sides of the hole in the longitudinal direction. Conversely, when the rotor frame rotates counterclockwise, the blade may be aligned to be biased to the right side of the two sides of the hole in the longitudinal direction.

As described above, when the blade is disposed to be biased in one direction with respect to the air inlet, more specifically, to each of the plurality of holes, air suctioned into the motor through the hole is scattered by the blade, and thus a vortex is generated so that a flow of air suctioned through the hole toward a coil can be generated to improve a cooling effect of the motor.

In a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes may be radially arranged in the base frame around a center of the base frame and may be formed long in a radial direction of the base frame. In this case, a blade may be formed so that, when compared to a height of one end portion of the blade close to the center of the base frame, a height of the other end portion of the blade close to a region in which a coil is disposed to face the base frame is greater than the height of the one end portion. In other words, the blade may have a shape in which the height significantly increases toward the coil. Accordingly, since air suctioned into the motor can flow toward the coil along the blade, the coil or core can be easily cooled.

In a motor for a laundry apparatus according to an embodiment of the present invention, a rotor frame further includes a plurality of beads convexly formed on one surface of a base frame. In this case, a height of one end portion of a blade is smaller than a height of each of the plurality of beads, and a height of the other end portion of the blade is greater than the height of each of the plurality of beads. The other end portion of the blade obliquely protrudes upward to a height greater than each of the height of each of the plurality of beads, and thus a flow direction of suctioned air can be more easily guided toward the coil.

In a motor for a laundry apparatus according to an embodiment of the present invention, an inclined surface may be provided at an upper end of a blade. In this case, the inclined surface may be formed so that a height of the blade gradually increases from one end portion of the blade toward the other end portion of the blade. The inclined surface may guide a flow direction of air suctioned through a plurality of holes toward a coil.

In a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes may be radially arranged in the base frame around a center of the base frame and may be formed long in a radial direction of the base frame. In this case, when compared to a width of one end portion of the hole close to the center of the base frame, a width of the other end portion of the hole close to a region in which a coil is disposed to face the base frame may be greater than the width of the one end portion, in each of the plurality of holes.

For example, each of the plurality of holes may have a fan shape in which the width gradually increases from the one end portion of the hole toward the other end of the hole.

As described above, the motor for a laundry apparatus according to the embodiment of the present invention, as each of the plurality of holes included in the air inlet has the fan shape in which the width gradually increases from the one end portion of the hole toward the other end portion of the hole, an air intake volume of air can be increased. In addition, a constant distance between the holes can be maintained, so that the strength and rigidity of the base frame can be improved compared to a quadrangular hole in which widths of one end portion and the other end portion of the hole are the same.

In a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes are radially arranged in the base frame around a center of the base frame and formed long in a radial direction of the base frame. In this case, each of the plurality of holes may be positioned outside a region in which a coil is disposed to face the base frame.

The holes are radially arranged in the base frame and formed long in the radial direction of the base frame, and, for example, the holes may be formed long by extending to the region in which the coil is disposed to face the base frame to correspond to a radius of the base frame. However, when such a long hole is formed, a phenomenon in which air suctioned into the motor through the hole flows along a lower surface of the base frame in an outer circumferential direction occurs, and there is a disadvantage that the air does not flow toward the coil. Accordingly, it is advantageous to form each of the plurality of holes to be shorter than the radius of the base frame so that the hole is positioned outside the region in which a coil is disposed to face the base frame and to be formed longer to correspond to a length of a blade in terms of cooling of the coil.

In addition, a motor for a laundry apparatus according to an embodiment of the present invention includes a stator, a rotor, and a driving shaft.

The stator includes a core having an annular shape and a coil wound around to the core. The rotor includes a magnet disposed outside the stator with an air gap interposed therebetween and a rotor frame which fixes the magnet and rotates outside the stator. The driving shaft may receive a rotational force from the rotor frame to rotate.

The rotor frame includes a shaft connecting part, a base frame, an extension frame, an air inlet, and a blade.

The shaft connecting part is connected to the driving shaft.

The base frame has a circular frame which is disposed to face a coil with a distance therebetween and has a center at which the shaft connecting part is positioned.

The extension frame has a circular tubular frame which protrudes from an edge of the base frame in a circumferential direction and has an inner circumferential surface to which the magnet is fixed.

The air inlet is formed to pass through the base frame in a thickness direction, and air outside the motor is suctioned into the motor through the air inlet.

The blade is positioned outside a region in which the coil is disposed to face the base frame. In other words, according to the embodiment of the present invention, the blade having a predetermined height is formed at the position outside the region in which the coil is disposed to face the base frame, so as not to affect a winding space of the coil. Accordingly, a height space in which the coil is wound inside the motor is sufficiently secured, and thus the heat dissipation performance of the motor can be improved by sufficiently increasing the height of the blade while improving the output and efficiency of the motor by increasing a volume of the coil at the same time.

The air inlet includes a plurality of holes formed inside the base frame. The plurality of holes are radially arranged in the base frame around the center of the base frame and are formed long in a radial direction of the base frame.

The rotor frame further includes a plurality of beads convexly formed on one surface of the base frame. The plurality of beads may be positioned outside the region in which the coil is disposed to face the base frame.

In addition, the plurality of beads may be radially arranged on the base frame around the center of the base frame and formed long in the radial direction of the base frame.

The shaft connecting part may be positioned on a central stepped part protruding a predetermined height from the base frame. The shaft connecting part further includes a rotor bushing provided in the central stepped part of the base frame. The rotor bushing includes a hub formed of a resin material and a serrated bushing formed of a metal material and insert-injection molded to be positioned at a rotation center of the hub. The rotor bushing may be fastened to the central stepped part of the base frame using a plurality of fastening screws.

One end portion of each of the plurality of beads may be connected to an inclined circumferential surface of the central stepped part to be closer toward the shaft connecting part than the air inlet. The other end portion of each of the plurality of beads may be positioned outside the region in which the coil is disposed to face the base frame.

In addition, in a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes may be radially arranged in the base frame around a center of the base frame and may be formed long in a radial direction of the base frame. In this case, the blade may be longitudinally connected to each of the plurality of holes in a longitudinal direction and may have a plate shape protruding to a set height.

In addition, in a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes may be radially arranged in the base frame around a center of the base frame and may be formed long in a radial direction of the base frame. In this case, a blade may be disposed to be biased to one side of two sides of each of the plurality of holes in a longitudinal direction, and a biased position may be determined according to a rotation direction of a rotor.

In addition, in a motor for a laundry apparatus according to an embodiment of the present invention, an air inlet includes a plurality of holes formed inside a base frame. The plurality of holes may be radially arranged in the base frame around a center of the base frame and formed long in a radial direction of the base frame. In this case, an inclined surface may be provided at an upper end of a blade. In this case, in the inclined surface, a height of the blade may gradually increase from one end portion of the blade toward the other end portion of the blade. The inclined surface may guide a flow direction of air suctioned through the plurality of holes toward a coil.

The above and other objects, features, and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing exemplary embodiments thereof in detail with reference to the accompanying drawings, in which:.

The above-described purposes, features, and advantages will be described in detail with reference to the accompanying drawings, and thus the technical spirit of the present invention may be easily implemented by those skilled in the art. In describing the present invention, detailed descriptions of well-known technologies related to the present invention that unnecessarily obscure the gist of the invention will be omitted. The same element or similar elements are denoted by the same reference numerals in the drawings.

Although terms such as first, second, or the like are used for describing various elements, the elements are not limited by the terms. The terms are only used to distinguish one element from another element, and unless otherwise specifically described, a first element may also be a second element.

Throughout the specification, unless specifically described otherwise, each element may be singular or a plurality.

Hereinafter, a case in which an arbitrary element is disposed "above (or under)" or "on (or below)" an element may include a case in which the arbitrary element is disposed to be in contact with an upper (or lower) surface of the element or a case in which still another element may be interposed between the element and the arbitrary element disposed above (or under) the element.

It should be understood that, when an element is referred to as being "connected or coupled" to another element, the element may be directly connected or coupled to another element, still another element may be interposed therebetween, or the elements may be connected or coupled through still another element.

The singular forms used in the present specification are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be interpreted that the term "comprise" or "include," when used herein, does not necessarily indicate the inclusion of all components or various operations stated in the specification, and some components and operations described therewith may be omitted or further additional components and operations may be included.

Throughout the specification, unless otherwise specifically described, "A and/or B" means "A," "B," or "A and B," and "C to D" means "more than or equal to C and less than or equal to D.

[Overall structure of driving apparatus for laundry apparatus to which motor for laundry apparatus is applied].

Hereinafter, the overall structure of a driving apparatus for a laundry apparatus to which a motor for a laundry apparatus according to an embodiment of the present invention is applied will be described with reference to the accompanying drawings.

<FIG> is a cross-sectional view illustrating an overall structure of a driving apparatus for a laundry apparatus according to one embodiment of the present invention.

A driving apparatus <NUM> for a laundry apparatus includes a motor <NUM> for a laundry apparatus, a shaft connecting part <NUM>, a clutch <NUM>, an inner shaft <NUM>, an outer shaft <NUM>, a gear <NUM>, a bearing housing <NUM>, and first and second bearings <NUM> and <NUM>.

The driving apparatus <NUM> for a laundry apparatus may further include various specific components which are generally usable in a washer, a dryer, or the like, in addition to the above components.

The motor <NUM> for a laundry apparatus includes a stator <NUM> and a rotor <NUM>.

The stator <NUM> includes a stator core <NUM> and a plurality of coils <NUM>.

The rotor <NUM> includes a plurality of magnets <NUM> and a rotor frame <NUM>.

The plurality of magnets <NUM> may be disposed outside of the stator <NUM> with air gaps interposed therebetween.

The rotor frame <NUM> refers to a cylindrical frame which fixes the plurality of magnets <NUM> and rotates outside the stator <NUM>.

A driving shaft <NUM> is connected to a rotation center of the rotor frame <NUM>.

In addition, a shaft connecting part <NUM>, to which the driving shaft <NUM> is fastened, may be provided at the rotation center of the rotor frame <NUM>.

For example, the shaft connecting part <NUM> and the driving shaft <NUM> may be firmly fastened in a serration manner to transmit a rotational force to each other.

In other words, the driving shaft <NUM> and the rotor frame <NUM> may be firmly fastened through a method in which one end portion of the driving shaft <NUM> is inserted into a hole (that is, a serrated hole) provided in a serrated bushing <NUM> of the shaft connecting part <NUM> positioned at a center of the rotor frame <NUM>. Accordingly, the driving shaft <NUM> may receive a rotational force of the rotor frame <NUM> without changing and output a torque necessary for a laundry apparatus.

The shaft connecting part <NUM> may be fixed to a central stepped part <NUM> protruding in a stepped shape from a base frame <NUM> constituting the rotor frame <NUM>.

For example, the shaft connecting part <NUM> further includes a rotor bushing <NUM> fixed to the central stepped part <NUM> of the base frame <NUM> using a fastening screw <NUM>.

The rotor bushing <NUM> further includes a hub <NUM> and a serrated bushing <NUM>.

For example, the hub <NUM> may be formed of a resin material by injection molding.

The serrated bushing <NUM> may be integrally molded with the hub <NUM> to be positioned at a rotation center of the hub <NUM>. As an example, the serrated bushing <NUM> may be formed of a metal material having superior rigidity and may be integrally insert-injection-molded into the hub <NUM>.

A serrated hole may be provided at a center of the serrated bushing <NUM>, and the driving shaft <NUM> may be partially inserted into and firmly fastened to the serrated hole.

In addition, a separate clutch bushing may be further provided on the shaft connecting part <NUM>.

The clutch <NUM> may slide up and down in an axial length direction of the driving shaft <NUM> by operation of a solenoid <NUM> to be selectively connected to and released from the clutch bushing so as to adjust the output of a laundry apparatus, that is, a washer or the like.

A rotational force of the motor <NUM> for a laundry apparatus may be transmitted to the driving shaft <NUM> through the rotating rotor frame <NUM> and then output as a predetermined torque through the inner shaft <NUM> and/or the outer shaft <NUM>.

The inner shaft <NUM> and the outer shaft <NUM> may be concentrically installed with the driving shaft <NUM>.

For example, the inner shaft <NUM> may be coupled to the rotor <NUM> to receive a rotational force of the motor <NUM> for a laundry apparatus. In addition, the outer shaft <NUM> may be formed to have a structure that is selectively connected to the rotor <NUM>.

The clutch <NUM> may control connection and disconnection between the outer shaft <NUM> and the rotor <NUM> through operation of the solenoid <NUM>.

In addition, a seal part <NUM> may be provided between the inner shaft <NUM> and the outer shaft <NUM>. The seal part <NUM> provides a function of sealing a space between the inner shaft <NUM> and the outer shaft <NUM>.

In addition, an oilless bearing <NUM> may be further provided between the inner shaft <NUM> and the outer shaft <NUM>.

Meanwhile, the gear <NUM> includes a sun gear <NUM> and a planetary gear <NUM>.

The sun gear <NUM> is connected to the driving shaft <NUM> and is configured to be rotatable with the driving shaft <NUM>.

The planetary gear <NUM> may be disposed to surround an outer side of the sun gear <NUM> and may be provided as a plurality of planetary gears <NUM>. The planetary gears <NUM> may receive a rotational force of the sun gear <NUM> and rotate according to a gear ratio set in correspondence with the sun gear <NUM>.

The bearing housing <NUM> is disposed under a tub of the laundry apparatus, that is, the washer, is not rotated, and is fixed to the tub without rotating. The bearing housing <NUM> may have a structure in which an upper end and a lower end are supported by the first bearing <NUM> and the second bearing <NUM>.

Hereinafter, a motor for a laundry apparatus according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings.

<FIG> is a half-cross-sectional perspective view illustrating a motor for a laundry apparatus according to an embodiment of the present invention, and <FIG> are drawings illustrating rotor frames which are included in motors for a laundry apparatus according to various embodiments of the present invention.

Referring to <FIG>, a motor <NUM> for a laundry apparatus includes a stator <NUM> and a rotor <NUM>.

The stator core (hereinafter, core) <NUM> may have an annular shape. For example, the core <NUM> may be formed in an annular structure surrounding a driving shaft <NUM> (see <FIG>) with the driving shaft <NUM> as a center. In addition, the core <NUM> is positioned inside the rotor <NUM>.

The coils <NUM> are wound and mounted on the core <NUM>, and the plurality of coils <NUM> may be mounted on the annular-shaped core <NUM> at predetermined intervals in a circumferential direction.

The output or efficiency of the motor may be improved according to a volume in which each coil <NUM> is wound. Accordingly, it is good to secure a sufficient winding space of the coils <NUM>.

The plurality of magnets <NUM> are circularly disposed outside the coils <NUM>, and each of the magnets <NUM> may be disposed to be spaced apart from the stator <NUM> with a predetermined air gap interposed therebetween.

The rotor frame <NUM> is a cylindrical frame in which one surface is open, and the plurality of magnets <NUM> may be installed and fixed along an inner circumference surface of the rotor frame <NUM> in the circumferential direction.

The rotor frame <NUM> may rotate outside the stator <NUM> by a magnetic force between the plurality of coils <NUM> and the plurality of magnets <NUM>.

For example, the plurality of magnets <NUM> are mounted and fixed along the inner circumferential surface of the rotor frame <NUM> in the circumferential direction.

The rotor frame <NUM> is rotated by an electromagnetic force between the plurality of magnets <NUM> and the coils <NUM> of the stator <NUM>. Accordingly, the driving shaft <NUM> (see <FIG>) may be fastened to a shaft connecting part <NUM> (see <FIG>) positioned at a center of the rotor frame <NUM> and rotated with the rotor frame <NUM>.

Specifically, the rotor frame <NUM> includes a base frame <NUM> and an extension frame <NUM>.

The base frame <NUM> refers to a circular plate-shaped frame disposed to face the coil <NUM> with a predetermined distance therebetween in a height direction.

The extension frame <NUM> refers to a circular tubular frame protruding from an edge of the base frame <NUM> in the circumferential direction.

The plurality of magnets <NUM> may be disposed along an inner circumferential surface of the extension frame <NUM> in the circumferential direction.

The rotor frame <NUM> is formed to include the circular plate-shaped base frame <NUM> and the circular tubular extension frame <NUM>, and has a cylindrical inner space corresponding to an area of the base frame <NUM> and a height of the extension frame <NUM>. In addition, the stator <NUM> including the core <NUM> and the plurality of coils <NUM> may be accommodated in the cylindrical inner space.

A shaft connecting part <NUM> is a part positioned at a center of the base frame <NUM> and serration-engaged with the driving shaft <NUM>.

For example, the shaft connecting part <NUM> may be positioned in a central stepped part <NUM> protruding in a stepped shape from a central portion of the base frame <NUM>.

The shaft connecting part <NUM> includes a rotor bushing <NUM>. The rotor bushing <NUM> is a member coupled to the central stepped part <NUM> using a plurality of fastening screws <NUM>.

For example, the rotor bushing <NUM> may include a hub <NUM> and a serrated bushing <NUM>. The hub <NUM> is a portion that is injection-molded using a resin material and constitutes the overall body of the rotor bushing <NUM>. Unlike the hub, the serrated bushing <NUM> is a part formed of a metal material, is positioned at a rotation center of the hub <NUM>, and is coupled to the driving shaft <NUM> (see <FIG>).

The serrated bushing <NUM> may have a structure integrally formed with the hub <NUM>. For example, the serrated bushing <NUM> may be formed of a metal material having superior rigidity and may have a structure integrally manufactured with the hub <NUM> by insert-injection molding the serrated bushing <NUM> into the hub <NUM> when the hub <NUM> formed of a resin material is injection-molded.

A serrated hole may be provided at a center of the serrated bushing <NUM>.

The driving shaft <NUM> (see <FIG>) may be partially inserted into and serration-engaged with the hole of the serrated bushing <NUM>. Accordingly, a rotational force may be transmitted between the driving shaft <NUM> (see <FIG>) and the rotor frame <NUM>, and thus a sufficient torque may be output.

In addition, the rotor frame <NUM> includes an air inlet <NUM> and a blade <NUM>.

The air inlet <NUM> is formed to pass through the base frame <NUM> in a thickness direction.

The air inlet <NUM> is formed to include a plurality of holes <NUM> and allows air outside the motor to pass through the plurality of holes <NUM> to be suctioned into the motor. The suctioned air cools the coil (or the core) of the motor to improve the heat dissipation performance of the motor.

The blade <NUM> may be formed of a thin plate shape disposed close to the air inlet <NUM>.

The blade <NUM> may be a structure integrally fixed with the rotor frame <NUM> at a position close to the air inlet <NUM> and may rotate with the rotor frame <NUM>.

When the blade <NUM> rotates, air suctioned through the air inlet <NUM> is forced to rotate and flow by the blade <NUM>, and the heat dissipation performance of the motor can be greatly improved compared to the case in which only the air inlet <NUM> is provided.

The blade <NUM> may be integrally fixed to the base frame <NUM> at a position close to the air inlet <NUM>, may protrude as much as a set height in the shape of a thin plate.

In other words, the blade <NUM> may have a shape vertically protruding from one surface of the base frame <NUM> in a direction intersecting the base frame <NUM>.

Meanwhile, the rotor frame <NUM> further includes a plurality of beads <NUM>. Each of the plurality of beads <NUM> have a shape convexly protruding from one surface of the base frame <NUM>.

The plurality of beads <NUM> refer to a structure which reinforces the strength of the base frame <NUM> which is rotationally driven. Each of the plurality of beads <NUM> may have an uneven shape convexly protruding from a surface of the base frame <NUM>.

When the base frame <NUM> rotates at a high speed, a phenomenon of structural distortion or elliptical deformation may occur due to centrifugal force.

The plurality of beads <NUM> reinforce the strength of the frame to prevent structural deformation when the base frame <NUM> is rotationally driven.

The plurality of beads <NUM> may be formed to extend to an inclined circumferential surface <NUM> of the central stepped part <NUM> formed close to the center of the base frame <NUM>. Accordingly, a reinforcement effect can be improved.

As described above, the motor <NUM> for a laundry apparatus according to the embodiment of the present invention, which is an outer rotor type motor in which a rotor rotates outside a stator, improves heat dissipation performance using the air inlet <NUM> and the blade <NUM> while securing the strength of the rotor frame <NUM>.

[Rotor frame of motor for laundry apparatus according to first embodiment].

<FIG> is a perspective view illustrating a rotor frame of a motor for a laundry apparatus according to a first embodiment of the present invention, <FIG> is a plan view illustrating the rotor frame of the motor for a laundry apparatus according to the first embodiment of the present invention. In addition, <FIG> is an enlarged view illustrating region "B" of <FIG>, <FIG> is a cross-sectional view along line "A-A" of <FIG>, and <FIG> is an enlarged view illustrating region "C" of <FIG>. <FIG> is a partial view showing a positional relationship between an air inlet, a blade, and a bead in the rotor frame of the motor for a laundry apparatus according to the first embodiment of the present invention, and <FIG> is a view showing that the air inlet, the blade, and the bead are positioned outside a region in which a coil is wound in the rotor frame of the motor for a laundry apparatus according to the first embodiment of the present invention.

As illustrated in the drawings, a rotor frame <NUM> of the motor for a laundry apparatus according to the first embodiment of the present invention refers to a cylindrical frame which fixes a plurality of magnets <NUM> (see <FIG>) and rotates outside a stator <NUM> (see <FIG>).

The rotor frame <NUM> includes a base frame <NUM> and an extension frame <NUM>. The base frame <NUM> is a circular plate-shaped frame disposed to vertically face coils <NUM> (see <FIG>) with a predetermined distance therebetween in a height direction.

The extension frame <NUM> is a circular tubular frame protruding from an edge of the base frame <NUM> in a circumferential direction. The plurality of magnets <NUM> (see <FIG>) may be fixed to an inner circumferential surface of the extension frame <NUM>.

The base frame <NUM> and the extension frame <NUM> are formed to have an integral structure so that the rotor frame <NUM> has a cylindrical inner space corresponding to an area of the base frame <NUM> and a height of the extension frame <NUM>.

A central stepped part <NUM> protruding in a stepped shape having a predetermined height is formed in a central portion of the base frame <NUM>, and an inclined circumferential surface <NUM> is formed to be inclined at an outer side of the central stepped part <NUM>.

A shaft connecting part <NUM> to which a driving shaft <NUM> is fastened in a serration manner may be fastened and assembled to a center of the central stepped part <NUM>.

In addition, the rotor frame <NUM> further includes an air inlet <NUM>, a blade <NUM>, and a bead <NUM>.

As a specific example, the air inlet <NUM> includes a plurality of holes <NUM> each having a predetermined length.

Since the plurality of holes <NUM> are formed to pass through the base frame <NUM> in the thickness direction, air outside the motor is introduced, that is, suctioned into the motor, through the plurality of holes <NUM>. The air suctioned through the plurality of holes <NUM> cools the coil (or core) inside the motor and improves the heat dissipation performance of the motor.

The plurality of holes <NUM> are radially disposed inside the base frame <NUM> about a center of the base frame <NUM>.

Each of the holes <NUM> are radially disposed from the center of the base frame <NUM> and may have a straight hole shape having a predetermined length and formed to extend in a radial direction (see <FIG>).

The blade <NUM> rotates with the rotor frame <NUM> and forces air suctioned through the plurality of holes <NUM> to flow. Accordingly, there are effects that the core (or coil) is cooled well, and the heat dissipation performance of the motor is improved.

Specifically, the blade <NUM> is disposed close to the air inlet <NUM>. This structure is provided so that the blade <NUM> forces the air suctioned through the air inlet <NUM>, that is, the plurality of holes <NUM>, to rotate.

The blade <NUM> may have a thin plate shape.

In addition, the blade <NUM> protrudes from one surface of the base frame <NUM> as much as a set height.

In this case, since the protruding height of the blade <NUM> is important in moving air suctioned by a rotational action of the blade <NUM>, it is advantageous to form the height of the blade <NUM> as large as possible in terms of the heat dissipation of the motor.

As a specific example, the blade <NUM> may have a shape vertically standing on one surface of the base frame <NUM>.

In particular, according to the embodiment of the present invention, the blade <NUM> is positioned on the base frame <NUM> outside a coil arrangement region <NUM> disposed to face the coil <NUM> (see <FIG> and <FIG>).

In the case of a motor <NUM> for a laundry apparatus according to the embodiment of the present invention, the motor <NUM> is an outer rotor type motor in which the rotor frame <NUM> rotates outside the stator <NUM> and has a disadvantage that a winding space of the coil <NUM> is reduced as much as the protruding height of the blade <NUM>.

Accordingly, in the motor <NUM> for a laundry apparatus, the blade <NUM> is disposed on the base frame <NUM> at a position outside the coil arrangement region <NUM> disposed to vertically face the coil <NUM> so as not to reduce the winding space of the coil <NUM> (see <FIG>).

Accordingly, in the motor <NUM> for a laundry apparatus, a height space in which the coil <NUM> is wound may be sufficiently secured, and thus a volume of the coil <NUM> may be sufficiently increased to improve the output and efficiency of the motor. In addition, as the blade <NUM> is also disposed at a position outside a position at which the coil <NUM> is wound, the height of the blade <NUM> may be sufficiently increased to a required level, and thus there is an advantage that it is advantageous for forcible flowing of suctioned air. As a result, the output and efficiency of the motor can be improved, and at the same time, the heat dissipation performance of the motor can be improved.

In addition, in the case of the motor <NUM> for a laundry apparatus according to the embodiment of the present invention, the volume of the coil <NUM> and the height of the blade <NUM> can be sufficiently increased without increasing the overall size of the motor by separating a space in which the coil <NUM> is wound and a space in which the blade <NUM> protrudes.

The bead <NUM> is provided on the base frame <NUM> to serve to reinforce the strength of the base frame <NUM>.

In the case of the motor <NUM> for a laundry apparatus according to the embodiment of the present invention, the motor <NUM> is the outer rotor type motor in which the rotor frame <NUM> rotates outside the stator <NUM> at a high speed.

When the rotor frame <NUM> rotates at a high speed, a phenomenon of distortion or elliptical deformation of the rotor frame <NUM> may occur due to the centrifugal force generated during rotation.

The bead <NUM> provides a function of improving and reinforcing the structural strength of the base frame <NUM> to prevent the structural deformation of the base frame <NUM> due to high-speed rotation.

The bead <NUM> is provided as a plurality of beads <NUM> on the base frame <NUM>.

Each of the plurality of beads <NUM> may have an uneven shape convexly protruding upward or downward from the inside of the base frame <NUM>.

For example, the plurality of beads <NUM> is convexly formed on one surface of the base frame <NUM> (see <FIG> and <FIG>).

In addition, the plurality of beads <NUM> may be formed on the base frame <NUM> at a position outside the coil arrangement region <NUM>.

When the plurality of beads <NUM> convexly protrude upward in the thickness direction of the base frame <NUM>, as illustrated in <FIG>, the plurality of beads <NUM> may be positioned outside the coil arrangement region <NUM> of the base frame <NUM>.

That is, by separating a region in which the plurality of beads <NUM> protrude from the region in which the coil is disposed to face in the base frame <NUM>, a decrease in height of the space, in which the coil <NUM> is wound, due to a protruding height of the bead <NUM> can be prevented.

As described above, the motor <NUM> for a laundry apparatus according to the embodiment of the present invention may include the plurality of beads <NUM> to prevent deformation of the base frame <NUM> and sufficiently secure the winding space of the coil to improve the output and efficiency of the motor at the same time.

Meanwhile, the plurality of beads <NUM> may be radially arranged on the base frame <NUM> about the center of the base frame <NUM>.

In addition, the plurality of beads <NUM> may have a straight protrusion shape having a predetermined length in a radial direction of the base frame <NUM>.

In this case, the plurality of holes <NUM> may be radially arranged to be spaced a predetermined distance from both sides of each of the plurality of beads <NUM>. For example, a length of each of the plurality of holes <NUM> formed in the radial direction of the base frame <NUM> may be smaller than a length of each of the plurality of beads <NUM>. In addition, two holes <NUM> disposed to be radially spaced a predetermined distance from each other may be formed between two adjacent beads <NUM>. In addition, the plurality of beads <NUM> and the plurality of holes <NUM> may be disposed at positions outside the coil arrangement region <NUM>. In other words, the plurality of beads <NUM> have a shape protruding only at positions outside the coil arrangement region <NUM>, and the plurality of holes <NUM> have a smaller length than a radius of the base frame <NUM> and may be formed only up to the positions outside the coil arrangement region <NUM> (see <FIG>).

Accordingly, deformation of the base frame <NUM> due to the beads <NUM> can be prevented, and air suctioned through the plurality of holes <NUM> can be forced to flow by the blade <NUM> to effectively cool the coil positioned in the coil arrangement region <NUM>.

In addition, the bead <NUM> may be formed to extend so as to be longer than a length of each of the plurality of holes <NUM> constituting the air inlet <NUM> in the radial direction of the base frame <NUM>.

For example, one end portion <NUM> of each of the plurality of beads <NUM> may longitudinally extend in the radial direction of the base frame <NUM> to be closer to the center of the base frame <NUM> than the holes <NUM> of the air inlet <NUM>. In addition, the other end portions <NUM> of the plurality of beads <NUM> may be formed at identical or similar positions to the holes <NUM> of the air inlet <NUM>. In other words, similarly to the holes <NUM>, the other end portions <NUM> of the plurality of beads <NUM> may be formed to be shorter than the radius of the base frame <NUM> and positioned outside the coil arrangement region <NUM> (see <FIG>). Accordingly, deformation can be prevented during high-speed rotation of the base frame <NUM>, an air intake volume of air suctioned through the air inlet <NUM> may be increased, and thus the heat dissipation performance of the motor can be improved.

Meanwhile, in the motor <NUM> for a laundry apparatus according to the embodiment of the present invention, the blade <NUM> may be longitudinally connected to each of the plurality of holes <NUM> in a longitudinal direction (see <FIG>).

Specifically, the blade <NUM> may be formed as a radial type.

As an example, the blade <NUM> may be manufactured by pressing the base frame <NUM>, in this case, when the blade <NUM> is manufactured to vertically protrude from the base frame <NUM>, manufacturing costs and product defects can be reduced.

The blade <NUM> is a plate-shaped structure protruding to a height H perpendicularly set from the base frame <NUM>.

In addition, the height H of the blade <NUM> may be formed to correspond to the height of each of the plurality of beads <NUM> (see <FIG>). The height H of the blade <NUM> may be sufficiently increased to force air suctioned by rotation of the blade <NUM> to flow so as to effectively cool the coil (or core).

Meanwhile, a length L2 of the blade <NUM> may be formed to be smaller than a length L1 of each of the plurality of holes <NUM> (see <FIG>). Accordingly, the air intake volume of air which passes and is suctioned through the plurality of holes <NUM> is increased, and suctioned air may be forced to flow by the rotation of the blade <NUM> so as to cool the coil (or coils).

Referring to <FIG>, each of the plurality of holes <NUM> constituting the air inlet <NUM> at both sides of the plurality of beads <NUM> may be disposed to have the length L1 in the radial direction. The blade <NUM> may protrude from the base frame <NUM> to the set height at a position adjacent to each of the holes <NUM>, and the blade <NUM> may be disposed to have a length L2 in the longitudinal direction of the hole <NUM>.

In this case, both of the air inlet <NUM> including the beads <NUM> and the holes <NUM> and the blade <NUM> may be positioned outside the coil arrangement region <NUM> in which the coil <NUM> (see <FIG>) is disposed (see <FIG>).

Accordingly, the height space in which the coil is wound on the base frame <NUM> may be sufficiently secured, and thus the output and efficiency of the motor can be improved by increasing the volume of the coil.

In addition, as the blade <NUM> is positioned outside the region in which the coil <NUM> is disposed, the height of the blade <NUM> may be sufficiently increased without constraints according to the volume of the coil to improve the heat dissipation performance of the motor.

In addition, by preventing a reduction in height space in which the coil <NUM> is wound due to a shape of the convexly protruding bead <NUM>, structural rigidity can be increased, and the output and efficiency of the motor can be improved.

[Rotor frame of motor for laundry apparatus according to second embodiment].

<FIG> is a perspective view illustrating a rotor frame of a motor for a laundry apparatus according to a second embodiment of the present invention, and <FIG> is a plan view illustrating the rotor frame of the motor for a laundry apparatus according to the second embodiment of the present invention. <FIG> is an enlarged view illustrating region "B" of <FIG>, <FIG> is a cross-sectional view along line "A-A" of <FIG>, and <FIG> is an enlarged view illustrating region "C" of <FIG>. In addition, <FIG> is a partial view showing a positional relationship between an air inlet, a blade, and a bead in the rotor frame of the motor for a laundry apparatus according to the second embodiment of the present invention, and <FIG> is a view showing that the air inlet, the blade, and the bead are positioned outside a region in which a coil is wound in the rotor frame of the motor for a laundry apparatus according to the second embodiment of the present invention.

As illustrated in the drawings, a cylindrical rotor frame <NUM> of the motor for a laundry apparatus according to the second embodiment of the present invention refers to a frame which fixes a plurality of magnets <NUM> (see <FIG>), and rotates outside a stator <NUM> (see <FIG>).

The base frame <NUM> and the extension frame <NUM> are formed to have an integral structure so that the rotor frame <NUM> has a cylindrical-shaped inner space corresponding to an area of the base frame <NUM> and a height of the extension frame <NUM>.

A central stepped part <NUM> protruding in a stepped shape having a predetermined height is formed in a central portion of the base frame <NUM>, and an inclined circumferential surface <NUM> is formed to be inclined at an outer side of the central stepped part <NUM>. A shaft connecting part <NUM> to which a driving shaft <NUM> is fastened in a serration manner may be fastened and assembled to a center of the central stepped part <NUM>.

The air inlet <NUM> is formed to pass through the base frame <NUM> in a thickness direction. The air inlet <NUM> includes a plurality of holes <NUM> each having a predetermined length. Since the plurality of holes <NUM> are formed to pass through the base frame <NUM> in the thickness direction, air outside the motor may be introduced, that is, suctioned into the motor, through the plurality of holes <NUM>. In addition, the air suctioned through the plurality of holes <NUM> cools the coil (or core) inside the motor and improves the heat dissipation performance of the motor.

The plurality of holes <NUM> is radially disposed inside the base frame <NUM> about a center of the base frame <NUM>. Each of the holes <NUM> is radially disposed from the center of the base frame <NUM> and may have a straight hole shape having a predetermined length and formed to extend in a radial direction (see <FIG>).

The blade <NUM> is disposed close to the air inlet <NUM>. Accordingly, the air suctioned through the air inlet <NUM>, that is, the plurality of holes <NUM>, is forced to flow by rotation of the blade <NUM> and can improve the heat dissipation effect of the motor.

The blade <NUM> may have a thin plate shape. In addition, the blade <NUM> protrudes from one surface of the base frame <NUM> as much as a set height.

Accordingly, in the motor <NUM> for a laundry apparatus, a height space in which the coil <NUM> is wound can be sufficiently secured, and thus a volume of the coil <NUM> can be sufficiently increased to improve the output and efficiency of the motor. In addition, as the blade <NUM> is also disposed at a position outside a position at which the coil <NUM> is wound, the height of the blade <NUM> can be sufficiently increased to a required level, and thus there is an advantage that it is advantageous for forcible flowing of suctioned air.

In the case of the motor <NUM> for a laundry apparatus according to the embodiment of the present invention, the motor <NUM> is the outer rotor type motor in which the rotor frame <NUM> rotates outside the stator <NUM> at a high speed. When the rotor frame <NUM> rotates at a high speed, a phenomenon of distortion or elliptical deformation of the rotor frame <NUM> may occur due to the centrifugal force generated during rotation.

The bead <NUM> reinforces the structural strength of the base frame <NUM> to prevent deformation of the base frame <NUM> due to high-speed rotation described above.

The bead <NUM> may be provided as a plurality of beads <NUM> on the base frame <NUM>. Each of the plurality of beads <NUM> may have an uneven shape convexly protruding upward or downward from inside the base frame <NUM>. For example, the plurality of beads <NUM> may be convexly formed on one surface of the base frame <NUM> (see <FIG> and <FIG>).

Meanwhile, the plurality of beads <NUM> may be formed on the base frame <NUM> at a position outside the coil arrangement region <NUM>. When the plurality of beads <NUM> convexly protrude upward in the thickness direction of the base frame <NUM>, as illustrated in <FIG>, the plurality of beads <NUM> may be positioned outside the coil arrangement region <NUM> of the base frame <NUM>.

As described above, by separating a region in which the plurality of beads <NUM> convexly protrude from the region in which the coil is disposed to face in the base frame <NUM>, a decrease in height of the space in which the coil <NUM> is wound due to a protruding shape of the bead <NUM> is prevented.

The plurality of beads <NUM> may be radially arranged on the base frame <NUM> about the center of the base frame <NUM>. In addition, the plurality of beads <NUM> may have a straight protrusion shape having a predetermined length in the radial direction of the base frame <NUM>.

In this case, the plurality of holes <NUM> may be radially arranged to be spaced a predetermined distance from both sides of each of the plurality of beads <NUM>. For example, a length of each of the plurality of holes <NUM> formed in the radial direction of the base frame <NUM> may be smaller than a length of each of the plurality of beads <NUM>. In addition, two holes <NUM> disposed to be radially spaced a predetermined distance from each other may be formed between two adjacent beads <NUM>. In addition, the plurality of beads <NUM> and the plurality of holes <NUM> may be disposed at positions outside the coil arrangement region <NUM> (see <FIG>).

Meanwhile, the bead <NUM> may be formed to extend so as to be longer than a length of each of the plurality of holes <NUM> constituting the air inlet <NUM> in the radial direction of the base frame <NUM>. For example, one end portion <NUM> of each of the plurality of beads <NUM> may longitudinally extend in the radial direction of the base frame <NUM> to be closer to the center of the base frame <NUM> than the hole <NUM> of the air inlet <NUM>.

In addition, the other end portion <NUM> of each of the plurality of beads <NUM> may be formed at identical or similar position to the hole <NUM> of the air inlet <NUM>.

Similarly to the holes <NUM>, the other end portion <NUM> of each of the plurality of beads <NUM> may be formed to be shorter than a radius of the base frame <NUM> and positioned outside the coil arrangement region <NUM> (see <FIG>). Accordingly, deformation due to the high-speed rotation of the base frame <NUM> can be prevented by the beads <NUM> each having a relatively long length, and by forming the holes <NUM> each having only the required length, the structural strength of the base frame <NUM> can be secured even while sufficiently suctioning external air.

Specifically, the blade <NUM> may be formed as a radial type. For example, the blade <NUM> may be manufactured by pressing the base frame <NUM>. In this case, when the blade <NUM> is manufactured to vertically protrude from the base frame <NUM>, manufacturing costs and product defects can be reduced.

In addition, the height H of the blade <NUM> may be formed to correspond to a height of each of the plurality of beads <NUM> (see <FIG>). When the height H of the blade <NUM> is sufficiently increased, a forcible flow effect of air suctioned by rotation of the blade <NUM> is improved, and, as a result, a cooling effect of the coil (or core) can be improved.

Meanwhile, the blade <NUM> may have a smaller length than each of the plurality of holes <NUM>.

In particular, a structure of the rotor frame <NUM> of the motor for a laundry apparatus according to the second embodiment of the present invention has features differentiated from a structure of the rotor frame of the first embodiment described above in terms of a formation position of the blade <NUM>.

Referring to <FIG> and <FIG>, in the case of the rotor frame <NUM> according to the second embodiment of the present invention, the blade <NUM> is disposed only at one side <NUM> of two sides <NUM> and <NUM> in the longitudinal direction of each of the plurality of holes <NUM>. That is, the blade <NUM> is disposed to be biased in only one direction with respect to the plurality of holes <NUM>.

In this case, a biased position of the blade <NUM> may be determined according to the rotation direction of the rotor frame <NUM>.

For example, when the rotor frame <NUM> rotates clockwise (R), the blade <NUM> may be disposed at one side <NUM> of each of the plurality of holes <NUM> (see <FIG>) in the longitudinal direction. Accordingly, air suctioned through the holes <NUM> may flow in a direction of an arrow of <FIG> and may be scattered by the blade <NUM> disposed at one side <NUM> of the hole <NUM> to generate a vortex. Accordingly, a flow of air may be concentrated toward the coil, and thus the heat dissipation effect of the motor can be improved.

In the opposite case, although not separately illustrated, when the rotor frame <NUM> rotates counterclockwise, the blade <NUM> may be disposed at the other side <NUM> of each of the plurality of holes <NUM> in the longitudinal direction.

As described above, in the motor for a laundry apparatus according to the second embodiment of the present invention, the blade <NUM> may be aligned in only one direction at one side <NUM> or the other side <NUM> of the hole <NUM> in the longitudinal direction according to the rotation direction of rotor frame <NUM>.

Meanwhile, referring to <FIG>, the plurality of beads <NUM>, the air inlet <NUM> including the plurality of holes <NUM>, and the blade <NUM> may be formed outside the region in which the coils <NUM> are disposed. Accordingly, the height space in which the coils are wound may be sufficiently secured, and thus the output and efficiency of the motor can be improved by increasing the volume of the coil.

In addition, since the blade <NUM> is positioned outside the region in which the coil <NUM> is disposed, the height of the blade <NUM> may be sufficiently increased, and the heat dissipation performance of the motor can be improved.

In addition, by preventing a reduction in height space in which the coil <NUM> is wound due to the shape of the convexly protruding bead <NUM>, structural rigidity can be improved, and the output and efficiency of the motor can be improved.

[Rotor frame of motor for laundry apparatus according to third embodiment].

<FIG> is a perspective view illustrating a rotor frame of a motor for a laundry apparatus according to a third embodiment of the present invention, and <FIG> is a plan view illustrating the rotor frame of the motor for a laundry apparatus according to the third embodiment of the present invention. In addition, <FIG> is an enlarged view illustrating region "B" of <FIG>, <FIG> is a cross-sectional view along line "A-A" of <FIG>, and <FIG> is an enlarged view illustrating region "C" of <FIG>.

As illustrated in the drawings, a rotor frame <NUM> of the motor for a laundry apparatus according to the third embodiment of the present invention refers to a cylindrical frame which fixes a plurality of magnets <NUM> (see <FIG>) and rotates outside a stator <NUM> (see <FIG>).

The air inlet <NUM> is formed to pass through the base frame <NUM> in a thickness direction. The air inlet <NUM> includes a plurality of holes <NUM> each having a predetermined length. Since the plurality of holes <NUM> are formed to pass through the base frame <NUM> in the thickness direction, air outside the motor is introduced, that is, suctioned into the motor, through the plurality of holes <NUM>. In addition, the air suctioned through the plurality of holes <NUM> cools the coil (or core) inside the motor and improves the heat dissipation performance of the motor.

The plurality of holes <NUM> is radially disposed inside the base frame <NUM> around a center of the base frame <NUM>.

Specifically, each of the holes <NUM> may be formed to extend to a predetermined length in a radial direction.

Referring to <FIG>, in each of the plurality of holes <NUM>, when compared to a width W1 of one end portion <NUM> of the hole <NUM> close to the center of the base frame <NUM>, a width W2 of the other end portion <NUM> of the hole <NUM> close to a coil arrangement region <NUM> may be greater than the width W1.

For example, each of the holes <NUM> may be formed in a fan shape in which a width size gradually increases from one end portion <NUM> toward the other end portion <NUM>.

As the hole <NUM> is formed in the fan shape, an air intake volume of air suctioned through the hole <NUM> may be increased to improve the heat dissipation performance of the motor.

In other words, as the hole <NUM> has the shape in which the width W2 of the other end portion <NUM> close to the coil is relatively large, more suctioned air may be introduced toward the coil. Accordingly, the cooling effect of the coil (or core) can be improved.

In addition, as the hole <NUM> is formed in the fan shape, a constant distance between the adjacent holes can be maintained to improve the strength and rigidity of the base frame <NUM>.

In other words, when the hole <NUM> has the fan shape, constant distances S1 and S2 between one end portions <NUM> and the other end portions <NUM> of the adjacent holes <NUM> may be maintained, and thus structural strength and rigidity can be improved.

When the hole <NUM> have the constant width size in a longitudinal direction, the distances between the adjacent holes <NUM> vary such that the distance between the holes <NUM> at a particular position becomes smaller, and thus a structurally weak portion may be present (see <FIG>).

In the case of the rotor frame <NUM> of the motor for a laundry apparatus according to the third embodiment of the present invention, the hole <NUM> has the fan shape, and the distances S1 and S2 between the adjacent holes <NUM> at positions of the one end portions <NUM> and the other end portions <NUM> of the holes <NUM> may be maintained the same. In <FIG>, since the distances S1 and S2 are the same, a structurally weak portion can be reduced.

The blade <NUM> rotates with the rotor frame <NUM> and forces air suctioned through the plurality of holes <NUM> to flow. Accordingly, there are effects of cooling the core (or coil) well and improving the heat dissipation performance of the motor.

The blade <NUM> is disposed close to the air inlet <NUM>. Accordingly, the air suctioned through the air inlet <NUM>, that is the plurality of holes <NUM>, is forced to flow by rotation of the blade <NUM> and thus the heat dissipation effect of the motor can be improved.

In the blade <NUM>, when compared to a height H1 of one end portion <NUM> of the blade <NUM>, which is a portion close to the base frame <NUM>, a height H2 of the other end portion <NUM> of the blade <NUM>, which is a portion close to the coil arrangement region <NUM>, is greater than the height H1 (see <FIG>).

Referring to <FIG>, a protruding shape of the blade <NUM> is formed so that the height H2 of the other end portion <NUM> is greater than the height H1 of one end portion <NUM>. More specifically, the blade <NUM> may have an inclined shape in which a height gradually increases from one end portion <NUM> toward the other end portion <NUM> of the blade <NUM>.

Accordingly, air suctioned through the hole <NUM> flows toward the coil along the inclined shape of the blade <NUM> and can effectively cool the coil (or core).

Due to such a protruding shape of the blade <NUM>, an inclined surface whose height gradually increases from one end portion <NUM> toward the other end portion <NUM> may be formed at an upper end of the blade <NUM>.

The inclined surface formed at the upper end of the blade <NUM> may move air suctioned through the plurality of holes <NUM> upward in a direction in which the coil is positioned, and thus the cooling effect of the coil (or core) can be improved.

The bead <NUM> is provided on the base frame <NUM> to serve to reinforce the strength of the base frame <NUM>. In other words, the bead <NUM> may prevent deformation of the base frame <NUM> due to high-speed rotation thereof.

The bead <NUM> is provided as a plurality of beads <NUM> on the base frame <NUM> and may be convexly formed on one surface of the base frame <NUM> to have a predetermined height.

For example, the height H1 of one end portion <NUM> of the blade <NUM> may be smaller than a height H3 of the bead <NUM>. In addition, a height of the other end portion <NUM> of the blade <NUM> is greater than the height H3 of the bead <NUM> (see <FIG>).

Accordingly, the blade <NUM> may protrude to a sufficient height to rotate air suctioned through the hole <NUM> to improve a cooling effect and, in addition, may send the suctioned air toward the coil, and thus the cooling effect of the coil can be maximized.

In addition, when the blade <NUM> is formed in the inclined shape, interference with other adjacent structures inside the rotor frame <NUM> may be reduced, a size of the hole <NUM> and a size of the blade <NUM> may be significantly increased, and thus the cooling effect can be further improved.

Hereinafter, improvement effects of the heat dissipation performance of the motor for a laundry apparatus according to the embodiment of the present invention will be described.

<FIG> is a set of heat flow analysis images for describing a motor heat dissipation effect of the motor for a laundry apparatus according to the first embodiment of the present invention. In <FIG>, an image A is a heat flow analysis result around the bead, an image B is a heat flow analysis result around the blade, and an image C is a heat flow analysis result around the hole. Referring to <FIG>, the blade generates an upward flow of air and generates a flow of the air in the radial direction through rotation thereof. In addition, it can be seen that the air diagonally flows toward the coil around the hole.

<FIG> is a set of analysis result images showing an effect of improving the motor heat dissipation performance of the motor for a laundry apparatus according to the second embodiment of the present invention. In <FIG>, an image A is a heat flow analysis result around the bead, an image B is a heat flow analysis result around the blade, and an image C is a heat flow analysis result around the hole. Referring to <FIG>, in the structure in which the blade is disposed to be biased to one side in the longitudinal direction of the hole according to a rotation direction of a rotor, when the blade is aligned only in one direction, it can be seen that the blade scatters air after suctioning the air and generates a vortex to further improve a cooling effect. In particular, referring to the images B and C of <FIG>, it can be seen that air around the blade and the hole flows more intensively toward the coil. Accordingly, the cooling effect of the coil (or core) can be improved, and the heat dissipation performance of the motor can be improved.

<FIG> is a perspective view illustrating a comparative example for comparison with the rotor frames according to the embodiments of the present invention, and <FIG> is an enlarged view illustrating a part of the comparative example illustrated in <FIG>.

Referring to <FIG>, a base frame <NUM> of a rotor frame <NUM> includes an air inlet <NUM> including a plurality of holes <NUM>, a blade <NUM>, and a bead <NUM>. In addition, a shaft connecting part <NUM> is provided at a center of the rotor frame <NUM>, and the shaft connecting part <NUM> further includes a rotor bushing <NUM> to which a driving shaft is connected.

In the case of the rotor frame <NUM> according to the comparative example illustrated in <FIG>, the air inlet <NUM>, the blade <NUM>, and the bead <NUM> are formed long in a radial direction of the base frame <NUM>, and formed to extend to a coil arrangement region.

<FIG> is a view showing a difference in possible coil winding height between an example of the present invention and the comparative example.

Referring to <FIG>, in the case of the rotor frame <NUM> according to the comparative example, the bead <NUM> and the blade <NUM> are formed up to the coil arrangement region in the base frame <NUM>. Accordingly, the rotor frame <NUM> has a layout structure in which a lower end 113a of a coil <NUM> wound around a stator core faces the bead <NUM> and the blade <NUM> protruding to set heights. As a result, a winding volume of the coil <NUM> is unavoidably reduced by the protruding heights of the bead <NUM> and the blade <NUM> and causes the output and efficiency of the motor to decrease.

Unlike the comparative example described above, in the case of the rotor frame <NUM> according to the example of the present invention, the bead <NUM> and the blade <NUM> have a structure in which the bead <NUM> and the blade <NUM> are positioned outside the coil arrangement region <NUM> in which the coils are wound and disposed in the base frame <NUM>. Accordingly, a lower end 113a of the coil <NUM> wound around the stator core does not face the bead <NUM> and the blade <NUM>, and there is an advantage of no restriction on increasing a volume of the coil <NUM> due to the protruding heights of the bead <NUM> and the blade <NUM>. In other words, the volume of the coil <NUM> can be sufficiently increased to improve the output and efficiency of the motor compared to the comparative example.

Referring to <FIG>, in rotor frames having the same size, the coil <NUM> according to the comparative example has a height CH1, and the coil <NUM> according to the example has a height CH2. In this case, the height CH2 of the coil <NUM> according to the example may be greater than the height CH1 of the coil <NUM> according to the comparative example, and the example can have higher output and efficiency than those of the comparative example.

Claim 1:
A motor (<NUM>) for a laundry apparatus, comprising:
a stator (<NUM>) including a core (<NUM>) having an annular shape and a coil (<NUM>) wound around the core (<NUM>); and
a rotor (<NUM>) including a magnet (<NUM>) disposed outside the stator (<NUM>) with an air gap interposed therebetween and a rotor frame (<NUM>) to fix the magnet and rotate outside the stator (<NUM>),
wherein the rotor (<NUM>) frame includes:
a base frame (<NUM>) having a circular shape and disposed to face a coil (<NUM>) with a distance therebetween;
an extension frame (<NUM>) protruding from an edge of the base frame (<NUM>) in a circumferential and axial direction and having an inner circumferential surface to which the magnet (<NUM>) is fixed;
an air inlet (<NUM>) which passes through the base frame (<NUM>) in a thickness direction and through which air is to be suctioned; and
a blade (<NUM>) disposed in contact with the air inlet (<NUM>) and protruding from the base frame (<NUM>) to a set height based on the axial direction, wherein the blade (<NUM>) is positioned outside a region in which the coil (<NUM>) is disposed to face the base frame (<NUM>),
wherein the air inlet (<NUM>) includes a plurality of holes (<NUM>) formed through the base frame (<NUM>); and
the plurality of holes (<NUM>) are arranged in the base frame (<NUM>) in circumferential direction around a center of the base frame (<NUM>) and formed long in a radial direction of the base frame (<NUM>),
wherein in the blade (<NUM>), when compared to a height (H1) of one end portion (<NUM>) of the blade (<NUM>) close to the center of the base frame (<NUM>), a height (H2) of the other end portion (<NUM>) of the blade (<NUM>) close to the region in which the coil (<NUM>) is disposed to face the base frame (<NUM>) is configured to be greater than the height (H1) of the one end portion (<NUM>),
wherein the rotor frame (<NUM>) further includes a plurality of beads (<NUM>) convexly formed on one surface of the base frame (<NUM>);
the height (H1) of the one end portion (<NUM>) of the blade (<NUM>) is smaller than a height (H3) based on the axial direction of each of the plurality of beads (<NUM>); and
the height (H2) of the other end portion (<NUM>) of the blade (<NUM>) is greater than the height (H3) based on the axial direction of each of the plurality of beads (<NUM>).