Patent Description:
<CIT> discloses a motor according to the preamble of claim <NUM>. <CIT> discloses an electric fluid pump and a rotor unit therefor. <CIT> discloses a motor with a rotor. Vehicles have a high temperature in an engine and thus require a cooling device. As the cooling device, a radiator configured to cool a high-temperature refrigerant and a condenser configured to condense the refrigerant may be provided. In addition, a fan is provided for blowing air toward the radiator or the condenser. The fan may be driven by a motor.

The motor includes a rotor and a stator. A plurality of magnets may be arranged in the rotor. Pockets may be provided in a rotor core and the magnets may be inserted into the pockets. An adhesive is used to fix the magnet to the pocket. The adhesive may be applied to the pocket, and the bonding force between the pocket and the magnet may be decreased due to the non-uniform application of the adhesive during the application process or the gap between the pocket and the magnet. As a result, there is a great risk of the magnet being separated from the rotor in a high-temperature narrow space in which the engine is disposed.

The motor may also include a housing configured to accommodate the rotor and the stator. The housing serves to physically fix the stator and at the same time to isolate and protect the rotor and the stator from the external space. Such a housing is a very disadvantageous configuration under high-temperature conditions, in which the engine is disposed, in dissipating heat generated by the rotor, the stator, or a printed circuit board. In addition, the housing is heavy in weight and difficult to form.

An embodiment is directed to providing a motor in which a magnet is prevented from being separated from a pocket of a rotor core.

In particular, an embodiment is also directed to providing a motor in which the use of an adhesive is reduced and a magnet is prevented from being separated from a pocket of a rotor core under a high-temperature condition.

Further, an embodiment is also directed to providing a motor in which heat is easily dissipated under a high-temperature condition.

Further, an embodiment is also directed to providing a motor whose weight may be reduced.

Objectives to be achieved by an embodiment of the present invention are not limited to the above-described objectives, and other objectives, which are not described above, may be clearly understood by those skilled in the art through the following specification.

The bearing holder includes a groove formed in the second region and a plate coupled to the groove and disposed on a lower surface of the rotor core.

The bearing holder may include a first step in contact with the first bearing and a second step in contact with the second bearing.

The plate may include a protruding portion protruding downward and extending in a radial direction.

A lower surface of the plate may include a sealant disposed in a circumferential direction.

A side surface of the magnet may be in contact with the rotor core without an adhesive.

An outer diameter of the flange portion may be within <NUM>% to <NUM>% of an outer diameter of the rotor core.

The rotor core may include a hub having an annular shape and teeth radially arranged in the hub, a guide groove may be disposed on an inner circumferential surface of the hub, and a guide protrusion inserted into the guide groove may be disposed on an outer circumferential surface of the cylinder portion.

An outer circumferential surface of the hub may include a protrusion protruding toward the pocket portion.

Another aspect of the present invention is as defined in claim <NUM>.

A step in contact with a lower surface of the stator may be disposed on the inner circumferential surface of the first cover.

The stator may include an insulator, and the insulator may cover the second region.

The insulator may include an upper insulator and a lower insulator, an outer diameter of the upper insulator may be greater than an inner diameter of the first cover and less than an outer diameter of the first cover, and an outer diameter of the lower insulator may be less than the inner diameter of the first cover.

The insulator may include an upper insulator and a lower insulator, the upper insulator may include an upper body having an annular shape and a plurality of upper side coil winding parts extending inwardly from the upper body, the upper body may include an upper surface portion and a first outer side surface portion extending downward from the upper surface portion, and an inner circumferential surface of the first outer side surface portion may be in contact with the second region.

A lower surface of the first outer side surface portion and an upper surface of the first cover may be disposed to be spaced apart from each other.

The insulator may include an upper insulator and a lower insulator, the lower insulator may include a lower body having an annular shape and a plurality of lower side coil winding parts extending inwardly from the lower body, and the lower body may include a terminal groove in which a busbar terminal is accommodated.

The lower body may include a lower surface portion and a second outer side surface portion extending upward from the lower surface portion, and an upper surface of the second outer side surface portion may be in contact with the lower surface of the stator.

The lower body may include a lower surface portion and a second outer side surface portion extending upward from the lower surface portion, and a connection terminal of the busbar terminal may be disposed to protrude from the lower surface portion so as to be exposed.

A groove portion disposed from a lower end to an upper end of the stator and disposed on an outer circumferential surface of the stator to be recessed in a radial direction of the stator may be included.

The shaft may be coupled to the first cover.

According to an embodiment, provided is an advantageous effect of preventing a magnet from being separated from a pocket of a rotor core.

According to an embodiment, provided is an advantageous effect of preventing a magnet from being separated from a pocket of a rotor core under a high-temperature condition.

According to an embodiment, provided is an advantageous effect of facilitating heat dissipation.

According to an embodiment, provided is an advantageous effect of reducing the weight of a product.

Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the drawings.

However, the technical spirit of the present invention is not limited to some embodiments which will be described herein and may be realized using various other embodiments, and at least one element of the embodiments may be selectively coupled, substituted, and used to realize the technical spirit within the range of the technical spirit.

Further, unless clearly and specifically defined otherwise by context, all terms (including technical and scientific terms) used herein can be interpreted as having customary meanings to those skilled in the art, and meanings of generally used terms, such as those defined in commonly used dictionaries, will be interpreted by considering contextual meanings of the related technology.

Further, the terms used in the embodiment of the present invention are provided only to describe embodiments of the present invention and not for limiting the present invention.

In the present specification, the singular forms include the plural forms unless the context clearly indicates otherwise, and the phrase "at least one element (or one or more elements) of an element A, an element B, and an element C" should be understood as including the meaning of at least one of all combinations being obtained by combining the element A, the element B, and the element C.

Further, in describing elements of the embodiment of the present invention, the terms such as first, second, A, B, (a), (b), and the like may be used.

These terms are merely for distinguishing one element from other elements, and the essential, order, sequence, and the like of corresponding elements are not limited by the terms.

In addition, when an element is referred to as being "connected or coupled" to another element, such a description may include both a case in which the element is directly connected or coupled to another element, and a case in which the element is connected or coupled to another element with still another element disposed therebetween.

Further, when an element is described as being formed or disposed "on (above)" or "under (below)" another element, the term "on (above)" or "under (below)" includes both a case in which two elements are in direct contact with each other or a case in which one or more elements are (indirectly) disposed between two elements. In addition, when an element is described as being disposed "on or under" another element, such a description may include a case in which the element is disposed at an upper side or a lower side with respect to another element.

<FIG> is a side cross-sectional view of a motor according to an embodiment, and <FIG> is an exploded perspective view of the motor shown in <FIG>.

Referring to <FIG> and <FIG>, a motor <NUM> according to the embodiment may include a shaft <NUM>, a rotor <NUM>, a stator <NUM>, an insulator <NUM>, a busbar terminal <NUM>, a first cover <NUM>, a printed circuit board <NUM>, and a second cover <NUM>.

The shaft <NUM> is an axis of the rotor <NUM> that rotates. The shaft <NUM> may be fixed without rotating. The shaft <NUM> may be coupled to the first cover <NUM>. Alternatively, the shaft <NUM> may be integrally formed with the first cover <NUM>.

The rotor <NUM> is rotatably coupled to the shaft <NUM>. In addition, the rotor <NUM> may be disposed inside the stator <NUM>. The rotor <NUM> rotates through an electrical interaction with the stator <NUM>.

A coil may be wound around the stator <NUM> to induce the electrical interaction between the stator <NUM> and the rotor <NUM>. A specific configuration of the stator <NUM> is provided as follows. The stator <NUM> may include a stator core <NUM> having a plurality of teeth. The stator core <NUM> may be provided with a yoke portion having an annular shape and the teeth around which a coil is wound in a center direction from the yoke portion. The teeth may be provided at regular intervals along an outer circumferential surface of the yoke portion. Meanwhile, the stator core <NUM> may be formed by stacking a plurality of plates having a thin steel sheet shape. Further, the stator core <NUM> may be formed by coupling or connecting a plurality of divided cores to each other.

The insulator <NUM> may be mounted on the stator core <NUM>. The insulator <NUM> serves to insulate the stator core <NUM> from the coil. The insulator <NUM> may be disposed above the stator core <NUM>.

The busbar terminal <NUM> may be mounted on the insulator <NUM>. The busbar terminal <NUM> is electrically connected to the coil of the stator <NUM>.

The first cover <NUM> is disposed below the stator <NUM>. The first cover <NUM> may be a cylindrical-shaped member having an open upper portion. The first cover <NUM> may be disposed to partially surround a lower side of the stator <NUM>.

The printed circuit board <NUM> may be disposed on a lower surface of the first cover <NUM>. Various electronic devices including an inverter for supplying power may be disposed on the printed circuit board <NUM>.

The second cover <NUM> may be disposed on the lower surface of the first cover <NUM>. The second cover <NUM> is coupled to the first cover <NUM> to accommodate the printed circuit board <NUM> in a space therebetween. The second cover <NUM> protects the printed circuit board <NUM> by covering the printed circuit board <NUM>. A connector (not shown) electrically connected to the printed circuit board <NUM> may be disposed on the second cover <NUM>.

<FIG> is an exploded perspective view of the rotor in <FIG>.

Referring to <FIG>, the rotor <NUM> may include a rotor core <NUM>, a magnet <NUM>, a bearing holder <NUM>, a first bearing <NUM>, and a second bearing <NUM>. Here, the first bearing <NUM> and the second bearing <NUM> are accommodated in the bearing holder <NUM>. The first bearing <NUM> may be disposed relatively further upward than the second bearing <NUM>.

<FIG> is a view illustrating the rotor core shown in <FIG>, and <FIG> is a view illustrating the rotor core in which the magnets are disposed. The following descriptions will be made with reference to <FIG> and <FIG>.

The rotor core <NUM> may include a hub <NUM> and a tooth <NUM>. A hole <NUM> is disposed at the center of the hub <NUM>. The bearing holder <NUM> is coupled to the hole <NUM>. A guide groove <NUM> is disposed on an inner circumferential surface of the hub <NUM>. The guide groove <NUM> may be disposed on the inner circumferential surface of the hub <NUM> to be recessed in a radial direction of the rotor core <NUM>. The guide groove <NUM> serves to guide the bearing holder <NUM> when the bearing holder <NUM> is inserted into the hole <NUM>. In addition, a plurality of protrusions <NUM> may be disposed on an outer circumferential surface of the hub <NUM>. The protrusions <NUM> may protrude from the outer circumferential surface of the hub <NUM>. The protrusions <NUM> serve to support an inner surface <NUM> of the magnet <NUM> mounted in a pocket <NUM>. A plurality of teeth <NUM> are radially arranged on the hub <NUM>. In addition, the plurality of teeth <NUM> are arranged along a circumference of the hub <NUM> at regular intervals.

The rotor core <NUM> includes a pocket portion <NUM>. The pocket portion <NUM> includes a plurality of pockets <NUM>. Here, the pocket <NUM> is defined as a separation space between the tooth <NUM> and the tooth <NUM>. An inner side of the pocket <NUM> in the radial direction of the rotor core <NUM> is closed due to the hub <NUM> and an outer side of the pocket <NUM> in the radial direction of the rotor core <NUM> is open. The magnet <NUM> is disposed in the pocket <NUM>. A planar shape of the pocket <NUM> may be rectangular. A protruding portion 121a may be disposed at an end of the tooth <NUM>. The protruding portion 121a may protrude toward the pocket <NUM> from a side surface of the end of the tooth <NUM>. The protruding portion 121a serves to prevent the magnet <NUM> disposed in the pocket <NUM> from being separated from the pocket <NUM> in the radial direction of the rotor core <NUM>. Meanwhile, the rotor core <NUM> may be formed by stacking a plurality of plates having a circular thin steel sheet shape.

The magnet <NUM> may be disposed in the pocket <NUM> such that long sides thereof are disposed in the radial direction of the rotor core <NUM> in a cross-sectional view. Such an arrangement of the magnet <NUM> may increase the arrangement density of the magnet <NUM>, thereby increasing the performance of the motor. The pocket <NUM> includes open upper and lower sides. Accordingly, the magnet <NUM> may be separated from the pocket <NUM> in an axial direction of the rotor core <NUM>. In order to prevent this, the bearing holder <NUM> is provided.

<FIG> is a view illustrating a cylinder portion and a flange portion of the bearing holder shown in <FIG>.

A bearing holder 300A prevents the magnet <NUM> from being separated from the pocket <NUM> (in <FIG>) toward an upper side of the rotor core <NUM>. In addition, the bearing holder 300A serves to fix the first bearing <NUM> and the second bearing <NUM>. The bearing holder 300A may include a cylinder portion 310A and a flange portion 320A.

An accommodation space for accommodating the first bearing <NUM> and the second bearing <NUM> is formed inside the cylinder portion 310A.

The flange portion 320A may have a disc shape. The flange portion 320A may be disposed to extend in a radial direction of the cylinder portion 310A from an upper end of the cylinder portion 310A. A lower surface of the flange portion 320A is disposed on an upper surface of the rotor core <NUM> to prevent the magnet <NUM> (in <FIG>) from being separated from the pocket <NUM> (in <FIG>) toward the upper side of the rotor core <NUM>. The lower surface of the flange portion 320A may be in contact with the upper surface of the rotor core <NUM>. A fastening portion 321A protrudes from an upper surface of the flange portion 320A. The fastening portion 321A is coupled to the fan. A plurality of fastening portions 321A may be provided.

<FIG> is a view illustrating a cylinder portion and a flange portion of a bearing holder according to a modified example.

A bearing holder 300B prevents the magnet <NUM> from being separated from the pocket <NUM> (in <FIG>) toward the upper side of the rotor core <NUM>. In addition, the bearing holder 300B serves to fix only the first bearing <NUM> among the first bearing <NUM> and the second bearing <NUM>. The second bearing <NUM> is fixed by a guide <NUM> of a plate <NUM> in <FIG>. The bearing holder 300B may include a cylinder portion 310B and a flange portion 320B.

An accommodation space for accommodating the first bearing <NUM> is formed inside the cylinder portion 310B. The cylinder portion 310B may be formed of a plurality of fragments. The flange portion 320B may have a disc shape. A fastening portion 321B protrudes from an upper surface of the flange portion 320B. The fastening portion 321B may be a fragment in which a portion of the flange portion 320B is cut and bent upward. The cylinder portion 310B may be a fragment bent downward from the flange portion 320B. The fastening portion 321B is coupled to the fan.

<FIG> is a view illustrating the plate, and <FIG> is a side cross-sectional view of the bearing holder in which the first bearing and the second bearing are accommodated.

Referring to <FIG>, the plate <NUM> may be disposed on a lower surface of the rotor core <NUM>. The plate <NUM> may include a base <NUM> having a disc shape. A hole <NUM> is disposed in a center of the base <NUM>. A plurality of guides <NUM> may be arranged at regular intervals along a circumference of the hole <NUM>. The guide <NUM> may be formed by being bent upward from an inner wall of the hole <NUM>. When the plate <NUM> is coupled to a lower surface of a cylinder portion <NUM>, the guide <NUM> may be press-fitted along a groove <NUM> of a second region <NUM> of the cylinder portion <NUM>. Alternatively, the guide <NUM> may be directly press-fitted on an inner circumferential surface of the rotor core. The second bearing <NUM> is disposed inside the guide <NUM>. An inner circumferential surface of the guide <NUM> is in contact with an outer circumferential surface of an outer ring of the second bearing <NUM>. An upper surface of the plate <NUM> is disposed on the lower surface of the rotor core <NUM> to prevent the magnet <NUM> from being separated from the pocket <NUM> toward a lower side of the rotor core <NUM>.

Referring to <FIG> and <FIG>, the cylinder portion 310A may include a first region <NUM> and the second region <NUM>. The first region <NUM> and the second region <NUM> are inserted into the hole <NUM> (in <FIG>) of the rotor core <NUM> (in <FIG>). The first bearing <NUM> may be disposed by being press-fitted into the first region <NUM>. A first step <NUM> may be disposed in the first region <NUM>. The first step <NUM> protrudes from an inner circumferential surface of the cylinder portion 310A and is in contact with a lower surface of the first bearing <NUM>. In addition, the first step <NUM> serves to distinguish the first region <NUM> from the second region <NUM>. The second bearing <NUM> may be disposed by being press-fitted into the second region <NUM>. Meanwhile, a second step <NUM> may be disposed in the second region <NUM>. The second step <NUM> protrudes from the inner circumferential surface of the cylinder portion 310A and is in contact with an upper surface of the second bearing <NUM>. The second step <NUM> also serves to distinguish the first region <NUM> from the second region <NUM>.

A guide protrusion 315A may be disposed on an outer circumferential surface of the cylinder portion 310A. The guide protrusion 315A is inserted into the guide groove <NUM> disposed on the inner circumferential surface of the hub <NUM> of the rotor core <NUM>. The groove <NUM> may be disposed in the second region <NUM> of the cylinder portion 310A. The groove <NUM> is for coupling with the plate <NUM>.

<FIG> is a view illustrating the motor and the fan shown in <FIG>.

Referring to <FIG>, the fastening portion <NUM> is coupled to a hub <NUM> of a fan <NUM>. The hub <NUM> may be provided with coupling holes 21a to which the fastening portions <NUM> are coupled. The plurality of fastening portions <NUM> are arranged to be aligned with the coupling holes 21a of the hub <NUM>.

<FIG> is a view illustrating an upper surface of the rotor shown in <FIG>.

Referring to <FIG>, an outer diameter R1 of the flange portion 320A is less than an outer diameter R2 of the rotor core <NUM> on the basis of a center C of the rotor <NUM>. For example, the outer diameter R1 of the flange portion 320A may range from <NUM>% to <NUM>% of the outer diameter R2 of the rotor core <NUM>. When the outer diameter R1 of the flange portion 320A is less than <NUM>% of the outer diameter R2 of the rotor core <NUM>, there is a great risk in that the magnet <NUM> may not be sufficiently prevented from being separated from the pocket <NUM>. In addition, there is a problem in that coupling safety with the fan <NUM> is poor because the fastening portion <NUM> is disposed too close to the center C of the bearing holder 300A. When the outer diameter R1 of the flange portion 320A is greater than <NUM>% of the outer diameter R2 of the rotor core <NUM>, there is a problem in that dimensional management of the gap with the stator <NUM> is difficult. Meanwhile, here, the outer diameter R2 of the rotor core <NUM> refers to the longest distance from the center C of the rotor <NUM> to an outer circumferential surface of the rotor core <NUM>.

<FIG> is a perspective view of the plate shown in <FIG> viewed from below.

Referring to <FIG>, the plate <NUM> may be disposed on the lower surface of the rotor core <NUM>. The plate <NUM> may include the base <NUM> having a disc shape. The hole <NUM> is disposed in the center of the base <NUM>. The plurality of guides <NUM> may be arranged at regular intervals along the circumference of the hole <NUM>. The guide <NUM> may be formed by being bent upward from the inner wall of the hole <NUM>. When the plate <NUM> is coupled to a lower surface of the cylinder portion 310A, the guide <NUM> may be press-fitted along the groove <NUM> of the second region <NUM> of the cylinder portion 310A. The second bearing <NUM> is disposed inside the guide <NUM>. The inner circumferential surface of the guide <NUM> is in contact with the outer circumferential surface of the second bearing <NUM>. The upper surface of the plate <NUM> is disposed on the lower surface of the rotor core <NUM> to prevent the magnet <NUM> from being separated from the pocket <NUM> toward the lower side of the rotor core <NUM>.

A lower surface of the plate <NUM> may be in contact with the upper surface of the rotor core <NUM>. A through hole <NUM> having an elongated shape may be disposed in the base <NUM>. A plurality of through holes <NUM> may be radially arranged around the hole <NUM>. The through hole <NUM> may become a passage through which air introduced from the upper side of the rotor core <NUM> is discharged. Alternatively, the through hole <NUM> may become a passage through which air introduced from the lower side of the rotor core <NUM> enters. The plate <NUM> may include a protruding portion <NUM>. The protruding portion <NUM> is disposed to protrude downward from the plate <NUM> and may be disposed to extend in a radial direction of the plate <NUM>. For example, the protruding portion <NUM> may be formed by extending from a sidewall of the through hole <NUM> and being bent upward.

The printed circuit board <NUM> may be disposed on the lower surface of the first cover <NUM>, and heat generated from the printed circuit board <NUM> may be transmitted toward the rotor <NUM> and the stator <NUM> through the first cover <NUM>. In addition, heat is also generated in the coil of the stator <NUM>. The protruding portion <NUM> serves to increase the contact area with air at a lower side of the plate <NUM>, thereby cooling the hot air. In addition, the protruding portion <NUM> serves as a blade as the rotor core <NUM> rotates to cause air flow in the rotor core <NUM>, thereby enhancing a heat dissipation effect.

<FIG> is a bottom view of the plate shown in <FIG>.

Referring to <FIG>, a length L1 of the protruding portion <NUM> may be less than a length L4 of the through hole <NUM>. Thus, a separation space such as "A" may be generated at a boundary between the protruding portion <NUM> and the through hole <NUM> in a longitudinal direction of the through hole <NUM>.

<FIG> is a bottom view of the rotor shown in <FIG>.

Referring to <FIG>, sealants <NUM> may be applied to the lower surface of the plate <NUM>. The sealants <NUM> may be arranged to form an annular shape in a circumferential direction of the plate <NUM>. The sealants <NUM> may be arranged with a boundary between the protruding portion <NUM> and the protruding portion <NUM> therebetween. A plurality of sealants <NUM> may be disposed. The sealant <NUM> may be disposed across the through hole <NUM>. The sealant <NUM> may be disposed to pass through a separation space such as "A" in <FIG> in which the protruding portion <NUM> is not formed. The sealant <NUM> may be continuously disposed to form an annular shape in the circumferential direction of the plate <NUM>. The sealant <NUM> located in the through hole <NUM> is in contact with the magnet <NUM> and the lower surface of the rotor core <NUM> exposed through the through hole <NUM>. Thus, together with the plate <NUM>, the sealant <NUM> may further prevent the magnet <NUM> from being separated from the pocket <NUM> toward the lower side of the rotor core <NUM>.

<FIG> is a view illustrating the stator shown in <FIG>, and <FIG> is an exploded perspective view of the stator shown in <FIG>.

Referring to <FIG> and <FIG>, the stator core <NUM> includes a yoke <NUM> having an annular shape and a plurality of teeth <NUM> protruding from an inner circumferential surface of the yoke <NUM>. In addition, the insulator <NUM> is mounted on the stator core <NUM>. The insulator <NUM> may include an upper insulator <NUM> and a lower insulator <NUM>.

The upper insulator <NUM> is mounted on an upper side of the stator core <NUM>, and the lower insulator <NUM> is mounted on a lower side of the stator core <NUM>.

<FIG> is a side view of the stator shown in <FIG>. The following descriptions will be made with reference to <FIG> and <FIG>.

The yoke <NUM> may include a first region <NUM> and a second region <NUM> on an outer circumferential surface thereof. The first region <NUM> and the second region <NUM> are divided in a height direction (a y-axis direction in <FIG>) of the yoke <NUM>. In <FIG>, an x-axis direction is a radial direction of the stator <NUM>. The second region <NUM> is a region disposed outside the first cover <NUM>. On the other hand, the first region <NUM> is a region disposed inside the first cover <NUM>. A step <NUM> in contact with a lower surface of the yoke <NUM> may be disposed on an inner circumferential surface of the first cover <NUM>.

The stator <NUM> is press-fitted into the first cover <NUM> through an open upper portion of the first cover <NUM>. In this case, the first region <NUM> is a region that is in contact with the inner circumferential surface of the first cover <NUM>, and the second region <NUM> is a region disposed above the first cover <NUM>. As described above, only the lower side of the stator <NUM> is partially inserted into the first cover <NUM> and is fixed to the first cover <NUM>. An upper side of the stator <NUM> is in an open state without a separate cover, and the lower side of the stator <NUM> is in a closed state due to the first cover <NUM>. The motor according to the embodiment eliminates a housing structure in which both the upper side and the lower side of the stator <NUM> are covered, thereby simplifying components and lightening a product.

The upper insulator <NUM> may include an upper body <NUM> having an annular shape and a plurality of upper side coil winding parts <NUM>. The plurality of upper side coil winding parts <NUM> may be formed to extend inwardly from the upper body <NUM>. Each of the plurality of upper side coil winding parts <NUM> covers each of the plurality of teeth <NUM>.

<FIG> is a side view of the stator shown in <FIG>.

Referring to <FIG>, <FIG>, and <FIG>, the upper body <NUM> may include an upper surface portion <NUM> and a first outer side surface portion <NUM>. An inner circumferential surface of the first outer side surface portion <NUM> is in contact with the second region <NUM> to cover the second region <NUM>. When the stator <NUM> is press-fitted into the first cover <NUM>, the second region <NUM> is exposed to the outside unlike the first region <NUM>. The upper body <NUM> is generally made of steel and thus has a risk of rust being generated thereon when moisture is in contact therewith. Thus, the first outer side surface portion <NUM> protects the stator <NUM> by covering the exposed second region <NUM>.

The lower insulator <NUM> may include a lower body <NUM> having an annular shape and a plurality of lower side coil winding parts <NUM>. The plurality of lower side coil winding parts <NUM> may be formed to extend inwardly from the lower body <NUM>. Each of the plurality of lower side coil winding parts <NUM> covers each of the plurality of teeth <NUM>.

The lower body <NUM> may include a lower surface portion <NUM> and a second outer side surface portion <NUM>. An upper surface of the second outer side surface portion <NUM> may be in contact with a lower surface of the stator core <NUM>. When the stator <NUM> is press-fitted into the first cover <NUM>, the lower insulator <NUM> is located inside the first cover <NUM>.

<FIG> is a view illustrating a terminal groove of the lower insulator shown in <FIG>.

Referring to <FIG>, the lower body <NUM> may include a terminal groove <NUM>. The busbar terminal <NUM> (in <FIG> and <FIG>) may be accommodated in the terminal groove <NUM>. The terminal groove <NUM> implements a space for accommodating the busbar terminal <NUM> (in <FIG> and <FIG>) through a structure having a plurality of partition walls. An upper portion of the lower body <NUM> is open so that the busbar terminal <NUM> (in <FIG> and <FIG>) may be accommodated in the terminal groove <NUM>. Thus, a cover <NUM> covering the terminal groove <NUM> may be provided. The cover <NUM> may be in the form of an annular-shaped plate. An upper surface of the cover <NUM> may be in contact with an upper surface of the stator core <NUM>.

<FIG> is a view comparing a diameter of the insulator and a diameter of the first cover.

Referring to <FIG>, an outer diameter D1 of the upper insulator <NUM> may be greater than an inner diameter D2 of the first cover <NUM> and less than an outer diameter D3 of the first cover <NUM>. In addition, an outer diameter D4 of the lower insulator <NUM> may be less than the inner diameter D2 of the first cover <NUM>.

<FIG> is a side view of the motor shown in <FIG>.

Referring to <FIG>, in a state in which the stator <NUM> is press-fitted into the first cover <NUM>, the upper insulator <NUM> covers and protects the exposed portion of the stator <NUM>. As shown in <FIG>, a gap G may be formed between a lower end of the upper insulator <NUM> and an upper end of the first cover <NUM>.

<FIG> is a plan view illustrating the stator.

Referring to <FIG>, it may include a groove portion <NUM> that is concavely disposed on the outer circumferential surface of the yoke <NUM> of the stator core <NUM>. The groove portion <NUM> may be disposed to be long from an upper end to a lower end of the yoke <NUM>. The groove portion <NUM> is for easily adjusting a press-fitting force when the stator <NUM> is press-fitted into the first cover <NUM>.

As described above, the motor according to one exemplary embodiment of the present invention has been specifically described with reference to the accompanying drawings.

Claim 1:
A motor (<NUM>) comprising:
a shaft (<NUM>) extending along an axial direction;
a rotor (<NUM>) coupled to the shaft (<NUM>); and
a stator (<NUM>) disposed outside the rotor (<NUM>),
wherein the rotor (<NUM>) includes:
a bearing holder (<NUM>) including a cylinder portion (310A) and a flange portion (320A);
a first bearing (<NUM>) and a second bearing (<NUM>) disposed in the cylinder portion (310A);
a rotor core (<NUM>) including a hole (<NUM>) coupled to the cylinder portion (310A); and
a magnet (<NUM>) coupled to the rotor core (<NUM>),
wherein the rotor core (<NUM>) includes a pocket portion (<NUM>),
the magnet (<NUM>) is disposed in the pocket portion (<NUM>),
the flange portion (320A) is disposed on a first axial end of the rotor core (<NUM>),
the cylinder portion (310A) includes a first region (<NUM>) in which the first bearing (<NUM>) is disposed and a second region (<NUM>) in which the second bearing (<NUM>) is disposed,
wherein the first region (<NUM>) and the second region (<NUM>) of the cylinder portion (310A) are inserted into the hole of the rotor core (<NUM>),
characterized in that
the flange portion (320A) is disposed on the magnet (<NUM>),
that the bearing holder (<NUM>) includes a groove (<NUM>) formed in the second region (<NUM>), and
that a plate (<NUM>) is coupled to the groove (<NUM>) and disposed on a surface of the rotor core which is axially opposite to the first axial side.