Patent ID: 12237748

MODES OF THE INVENTION

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

However, the technical spirit of the present invention is not limited to some embodiments which will be described and may be embodied in a variety of different forms, and at least one or more components of the embodiments may be selectively combined, substituted, and used within the range of the technical spirit.

In addition, unless clearly and specifically defined otherwise by the context, all terms (including technical and scientific terms) used herein can be interpreted as having meanings customarily understood by those skilled in the art, and meanings of generally used terms, such as those defined in commonly used dictionaries, will be interpreted in consideration of contextual meanings of the related art.

In addition, the terms used in the embodiments of the present invention are considered in a descriptive sense only and not to limit the present invention.

In the present specification, unless clearly indicated otherwise by the context, singular forms include the plural forms, and in a case in which “at least one (or one or more) among A, B, and C” is described, this may include at least one combination among all possible combinations of A, B, and C.

In addition, in descriptions of components of the present invention, terms such as “first,” “second,” “A,” “B,” “(a),” and “(b)” can be used.

The terms are only to distinguish one element from another element, and the essence, order, and the like of the elements are not limited by the terms.

In addition, it should be understood that, 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.

In addition, when any one element is described as being formed or disposed “on” or “under” another element, such a description includes both a case in which the two elements are formed or disposed in direct contact with each other and a case in which one or more other elements are interposed between the two elements. In addition, when one element is described as being formed “on or under” another element, such a description may include a case in which the one element is formed at an upper side or a lower side with respect to another element.

FIG.1is a perspective view illustrating a motor according to an embodiment,FIG.2is a cross-sectional perspective view illustrating the motor according to the embodiment, andFIG.3is a cross-sectional view illustrating the motor according to the embodiment. InFIGS.1to3, an x direction may be an axial direction, and a y direction may be a radial direction. In addition, the axial direction and the radial direction may be perpendicular to each other. In this case, the axial direction may be a longitudinal direction of the shaft500.

A motor1according to the embodiment may include a housing100having one side at which an opening is formed, a cover200disposed on the housing100, a stator300disposed in the housing100, a rotor400disposed inside the stator300, a shaft500which rotates along with the rotor400, a busbar600disposed on the stator300, and a connector700disposed on the stator300. In this case, the term “inward” may be a direction toward a center C, and the term “outward” may be a direction opposite to “inward.”

The motor1may be a motor used in an active roll stabilizer (ARS).

The housing100and the cover200may form an exterior of the motor1. In addition, an accommodation space may be formed by coupling the housing100and the cover200. Accordingly, as illustrated inFIG.1, the stator300, the rotor400, the shaft500, and the like may be disposed in the accommodation space. In this case, the shaft500is rotatably disposed in the accommodation space. Accordingly, the motor1may further include bearings10disposed on upper and lower portions of the shaft500.

The housing100may be formed in a cylindrical shape. In addition, the housing100may accommodate the stator300, the rotor400, and the like therein. In this case, a shape or material of the housing100may be variously changed. For example, the housing100may be formed of a metal material which firmly withstands even at high temperatures.

The cover200may be disposed on an open surface of the housing100, that is, on the housing100, to cover the opening of the housing100. In this case, the cover200may be formed of a metal material.

FIG.4is a view illustrating the cover disposed in the motor according to the embodiment.

Referring toFIG.4, the cover200may include a cover body210, a first cover protruding part220, a second cover protruding part230, and a hole240formed for grounding. In this case, the cover body210, the first cover protruding part220, and the second cover protruding part230may be integrally formed.

The cover body210may serve as a cover which covers the opening of the housing100. Accordingly, the cover body210may be disposed on the open surface of the housing100, that is, on an upper portion of the housing100.

The first cover protruding part220may be formed to protrude in an upward direction, which is one direction of the axial direction, from an outer circumference or edge of the cover body210. Accordingly, the first cover protruding part220may guide an arrangement of the connector700. In this case, the first cover protruding part220may be referred to as a wall.

The second cover protruding part230may be formed to protrude in a downward direction, which is the other direction of the axial direction, from a central portion of the cover body210. Accordingly, the bearing10may be disposed inside the second cover protruding part230. In this case, the second cover protruding part230may be referred to as a bearing accommodation part or cover pocket part. In addition, the second cover protruding part230may include the hole formed in the central portion to arrange the shaft500.

The hole240may be formed in the cover body210to pass through the cover body210in the axial direction. In addition, one side of a shield terminal730may be disposed in contact with an inner circumferential surface241of the hole240.

The stator300may be disposed inside the housing100. In this case, the stator300may be supported by an inner circumferential surface of the housing100. In addition, the stator300may be disposed outside the rotor400. That is, the rotor400may be rotatably disposed inside the stator300.

Referring toFIG.2, the stator300may include a stator core310, coils320wound around the stator core310, and an insulator330disposed between the stator core310and the coils320.

The coils320which generate a rotating magnetic field may be wound around the stator core310. In this case, the stator core310may be formed as one core or formed by coupling a plurality of divided cores.

In addition, the stator core310may be formed in a form in which a plurality of thin steel plates are stacked but is not necessarily limited thereto. For example, the stator core310may also be formed as one single part.

The stator core310may include a yoke (not shown) having a cylindrical shape and a plurality of teeth (not shown) protruding from the yoke in the radial direction. In addition, the coils320may be wound around the teeth.

The insulator330insulates the stator core310from the coils320. Accordingly, the insulator330may be disposed between the stator core310and the coils320.

Accordingly, the coils320may be wound around the teeth of the stator core310on which the insulator330is disposed.

The rotor400may be disposed inside the stator300. In addition, the shaft500may be coupled to a central portion thereof.

The rotor400may be formed so that magnets420are coupled to the rotor core410. For example, the rotor400may be formed as a type in which the magnets420are disposed on an outer circumferential surface of the rotor core410.

Accordingly, the magnets420may generate a rotating magnetic field with the coils320wound around the stator300. The magnets420may be disposed so that N-poles and S-poles are alternately positioned in a circumferential direction about the shaft500.

Accordingly, the rotor400rotates due to an electric interaction between the coils320and the magnets420, and when the rotor400rotates, the shaft500rotates to generate a driving force of the motor1.

Meanwhile, the rotor core410of the rotor400may be manufactured by coupling a plurality of divided cores or manufactured as a single core form including one container. In this case, the rotor core410may be formed in a form in which a plurality of thin steel plates are stacked.

As illustrated inFIGS.1and2, the shaft500may be disposed in the housing100and rotatably supported by the bearings100. In addition, the shaft500may rotate with the rotor400in conjunction with the rotation of the rotor400.

The busbar600may be disposed on the stator300.

In addition, the busbar600may be electrically connected to the coils320of the stator300.

The busbar600may include a busbar body610and a plurality of busbar terminals620disposed on the busbar body610.

The busbar body610may be a molded part formed by injection-molding an insulation material. In addition, the busbar body610may be formed in an annular shape.

The busbar terminals620may be disposed on the busbar body610through an injection molding manner. In this case, parts of the busbar terminals620may be formed to be exposed at the busbar body610.

In addition, one sides of the busbar terminals620may be electrically connected to the coils320of the stator300. In addition, the other sides of the busbar terminals620may be formed to protrude upward to pass through the cover200. Accordingly, the other sides of the busbar terminals620may be connected to power terminals720of the connector700through fusing.

The connector700may be disposed on the cover200and coupled to the cover200using a coupling member such as a bolt. That is, the motor1has an advantage that the shield terminal730is naturally grounded to the hole240of the cover200in a process in which the connector700is assembled with the cover200.

FIG.5is an exploded perspective view illustrating an arrangement relationship between the cover and the connector which are disposed in the motor according to the embodiment,FIG.6is a view illustrating a state before the cover and the connector, which are disposed in the motor according to the embodiment, are coupled, andFIG.7is a view illustrating a state after the cover and the connector, which are disposed in the motor according to the embodiment, are coupled.

Referring toFIGS.2and3andFIGS.5to7, the connector700may be disposed on the cover200. In addition, the connector700may include a connector body710and the plurality of power terminals720and the shield terminal730which are disposed on the connector body710. In this case, the shield terminal730may be referred to as a ground terminal.

Accordingly, the connector700may transmit power applied from the outside to the coils320using the power terminals720.

The connector body710may be a molded part formed of an insulation material. In this case, the connector body710may serve as a frame which combines the power terminals720and the shield terminal730into one component.

The connector body710may include a body part711and a connector part712.

The body part711may be disposed on the cover200.

The connector part712may be formed to protrude from the body part711in the axial direction. In addition, an external power source may be connected to the connector part712.

The power terminals720and the shield terminal730may be disposed on the connector body710through injection-molding. In this case, parts of the power terminals720and a part of the shield terminal730may be disposed to be exposed at connector body710.

The power terminals720allow power applied from the outside to be transmitted to the busbar600. In this case, the power terminals720may be formed of a metal material.

One end portion of each of the power terminals720may be disposed to face or be in contact the other side of one of the busbar terminals620and be electrically coupled to one of the busbar terminals620through fusing or the like.

In addition, at least three power terminals720may be formed, and the power terminals720may be connected to the busbar terminals620of U-, V-, and W-phases.

The shield terminal730may be disposed in contact with the cover200to be grounded. As illustrated inFIG.7, an end portion of the shield terminal730disposed to be exposed at the connector body710may be in contact with the inner circumferential surface241of the hole240to be grounded.

Referring toFIGS.6and7, the shield terminal730may include a first region731which is disposed in the radial direction and has one portion disposed on the connector body710, a second region732extending from an end portion of the first region731in the axial direction, a third region733extending from an end portion of the second region732to have a curved surface733a, and a fourth region734extending from an end portion of the third region733in the axial direction. In this case, a position of the fourth region734may be changed by a reaction force generated by the curved surface733abeing in contact with the inner circumferential surface241of the hole240. Accordingly, the fourth region734may be in contact with an edge242disposed at a lower side of the hole240. In this case, the curved surface733amay be formed to have a predetermined curvature.

As illustrated inFIG.7, as one region of the third region733is bent by the reaction force generated by the inner circumferential surface241of the hole240being in contact with the curved surface733a, the position of the fourth region734may be changed to be inclined. Accordingly, a two-point contact structure of the shield terminal730may be implemented using the fourth region734in contact with the edge242disposed at the lower side of the hole240in addition to the third region733in contact with the inner circumferential surface241of the hole240. Specifically, since the curved surface733amay be formed to have the predetermined curvature, the curved surface733aof the shield terminal730moves downward while being in contact with a corner at an upper side of the inner circumferential surface241. Accordingly, the shield terminal730is bent toward an inner side of the hole240. In addition, the two-point contact structure of the shield terminal730may be implemented using the fourth region734in contact with the edge242disposed at the lower side of the hole240in addition to the third region733in contact with the inner circumferential surface241of the hole240.

That is, a part of the curved surface733aof the third region733may be disposed to overlap the hole240in the axial direction in a process of assembling the connector700and the cover200. In addition, when the fourth region734is guided by the hole240, since the part of the curved surface733aof the third region733is disposed to overlap the hole240, the curved surface733amay be in contact with the inner circumferential surface241of the hole240. In addition, since the one region of the third region733is bent by the reaction force generated by the curved surface733abeing in contact with the inner circumferential surface241of the hole240, one side of the fourth region734may be in contact with the edge242disposed at the lower side of the hole240.

Accordingly, when the end portion of the shield terminal730is inserted into the hole240by coupling the cover200and the connector700, since the two-point structure of the shield terminal730is implemented due to the reaction force, a grounding force of the shield terminal730can be increased. For example, the grounding force of the shield terminal730can be increased by implementing the two-point structure through contact between the curved surface733aand the inner circumferential surface241of the hole240and contact between the fourth region734and the edge242disposed at the lower side of the hole240.

Meanwhile, the hole240may be formed to have a circular horizontal cross section. In addition, the shield terminal730may be formed by bending a plate shaped member. Accordingly, an edge of the third region733at at least one side in the circumferential direction may be in contact with the inner circumferential surface241of the hole240. In addition, an edge of the fourth region734at at least one side in the circumferential direction may be in contact with the edge242disposed at the lower side of the hole240at at least one side.

That is, as the hole240is formed in a circular shape, and the shield terminal730is formed by bending a plate shaped member, the hole240and the shield terminal730may be in contact with each other at four points at maximum.

In addition, the shield terminal730may be formed of an elastic material, a ductile material, or the like. For example, the shield terminal730may be formed of a low resistance material such as gold, silver, and copper to reduce noise interfering with the sensing. Accordingly, a structure of the shield terminal730can allow a ground structure to be optimized by variously forming a shape according to a material.

FIGS.8A and8Bare views structures of the connector disposed in the motor according to the embodiment.FIG.8Ais the view illustrating a structure of the shield terminal730and an arrangement relationship between the shield730and the hole240before the cover200and the connector700are coupled when the shield terminal730is formed of a ductile material, andFIG.8Bis the view illustrating a structure of the shield terminal730and an arrangement relationship between the shield terminal730and the hole240before the cover200and the connector700are coupled when the shield terminal730is formed of an elastic material.

In this case, the ductile material may be a material which is deformed without being broken even when receiving a force greater than or equal to that corresponding to an elastic limit of the material. For example, the ductile material may be a material of which a load (reaction force) applied to the curved surface733aof the shield terminal730is greater than that corresponding to an elastic limit. In addition, the elastic material may be a material of which a load (reaction force) applied to the curved surface733aof the shield terminal730is less than that corresponding to an elastic limit.

Accordingly, the ductile material is a material of which deformation remains without returning to an original state even when the reaction force (deforming force) is removed because the reaction force is greater than that corresponding to an elastic limit and may be referred to as a plastic material. In addition, the elastic material is a material which returns to an original state when the reaction force is removed because the reaction force is smaller than that corresponding to an elastic limit and may be referred to as an elastic deformation material.

Referring toFIG.8A, when the shield terminal730is formed of the ductile material, the fourth region734may be disposed not to overlap the second region732in the axial direction. Accordingly, the fourth region734and the second region732may be formed to have an offset G in the radial direction. As illustrated inFIG.8A, the fourth region734may be disposed apart from a virtual line L passing through the second region732in the axial direction by a distance from the virtual line L. Accordingly, when the third region733is deformed, the fourth region734can be easily in contact with the edge242disposed at the lower side of the hole240even when a deformation amount of the third region733is smaller than a deformation amount of the third region733of the shield terminal730formed of an elastic material.

Referring toFIG.8B, when the shield terminal730is formed of the elastic material, the fourth region734may be disposed to overlap the second region732in the axial direction. Accordingly, the fourth region734and the second region732may be formed not to have the offset G in the radial direction. As illustrated inFIG.8B, the fourth region734may be disposed on the virtual line L passing through the second region732in the axial direction. Accordingly, even when the third region733is elastically deformed by the reaction force, the fourth region734may be easily in contact with the edge242disposed at the lower side of the hole240.

FIG.9is a view illustrating a modified example of the cover disposed in the motor according to the embodiment.

Referring toFIG.9, the hole240of the cover200may be formed in a tapered shape. For example, the hole240may be formed in the tapered shape having an upper inner diameter greater than a lower inner diameter. Accordingly, the fourth region734may be more easily in contact with the edge242disposed at the lower side of the hole240. For example, since an inner circumferential surface241of the hole240formed in the tapered shape is in slidable contact with the curved surface733a, the fourth region734may be more easily in contact with the edge242disposed at the lower side of the hole240.

Particularly, when the shield terminal730is formed of the ductile material, even when the deformation amount of the third region733is smaller than the deformation amount of the third region733of the shield terminal730formed of the elastic material, due to the tapered shape, the fourth region734may be more easily in contact with the edge242disposed at the lower side of the hole240.

While the present invention has been described above with reference to the exemplary embodiments, it may be understood by those skilled in the art that various modifications and changes of the present invention may be made within a range not departing from the spirit and scope of the present invention defined by the appended claims.

[REFERENCE NUMERALS]1: MOTOR100: HOUSING200: COVER240: HOLE300: STATOR310: STATOR CORE320: COIL330: INSULATOR400: ROTOR500: SHAFT600: BUSBAR700: CONNECTOR730: SHIELD TERMINAL