motor

Abstract

In an embodiment, a motor is disclosed, including: a housing; a cover disposed on a top of the housing; a stator disposed inside the housing; a rotor disposed inside the stator; a shaft coupled to the rotor; and a connector disposed on a top of the cover, wherein the connector includes a connector body and a shield terminal disposed on the connector body to be partially exposed, wherein the cover is formed of a metal material, and wherein the shield terminal is inserted into a hole in the cover to form contact with the hole in the cover. Accordingly, by using the shield terminal including a curved surface and the hole formed in the cover, the clamping force of the motor can be improved.

Description

Technical Field

[0001] This invention relates to motors. Background Technology

[0002] A motor is a device constructed to convert electrical energy into mechanical energy to obtain rotational force and is widely used in vehicles, household appliances, industrial machinery, etc.

[0003] Specifically, a motor can be applied to an active roll stabilizer (ARS). In this case, the ARS can be a device that adjusts the stabilizer bars to improve safety and ride comfort. More specifically, the ARS can be a device that adjusts the degree of torsion of the stabilizer to improve the vehicle's rotational safety when the vehicle is turning.

[0004] A motor may include a housing, a shaft, a stator disposed on the inner circumferential surface of the housing, a rotor mounted on the outer circumferential surface of the shaft, and busbars disposed on the stator. In this case, the stator introduces an electrical interaction with the rotor to cause the rotor to rotate.

[0005] In this scenario, the motor can be grounded using a wire or similar material extending to the bolt area. However, using a separate wire or similar material carries the risk of disconnection, potentially leading to interference between the wire and other components of the motor. Therefore, the motor may include a shielded terminal to be grounded. In this case, the shielded terminal may be a grounding terminal configured to reduce noise during sensing operations for electronic control.

[0006] In this case, the shielding terminals can be formed of low-resistance materials such as gold, silver, or copper. However, since gold, silver, copper, or similar materials are ductile, additional fixing methods or structures are required.

[0007] Therefore, when implementing the shielding terminal of the motor structurally or mechanically, the following grounding structure is required: the grounding structure takes into account the ductility of the shielding terminal material and the contact portion of the shielding terminal. Summary of the Invention

[0008] Technical issues

[0009] The present invention relates to providing a motor that includes shielded terminals with improved grounding performance.

[0010] The objectives to be achieved by this invention are not limited to those described above, and those skilled in the art will clearly understand from the following description other objectives not described above.

[0011] Technical solution

[0012] One aspect of the present invention provides a motor comprising: a housing; a cover disposed on the housing; a stator disposed inside the housing; a rotor disposed inside the stator; a shaft coupled to the rotor; and a connector disposed on the cover, wherein the connector includes a connector body and shielding terminals disposed on the connector body such that a portion of the shielding terminals is exposed, the cover is formed of a metallic material, and the shielding terminals are inserted into and contact the holes in the cover.

[0013] The shielding terminal may include: a first region; a second region extending axially from an end portion of the first region; a third region extending from an end portion of the second region and having a curved surface; and a fourth region extending from an end portion of the third region, wherein the curved surface may be configured to contact the inner circumferential surface of the hole. Additionally, when the curved surface contacts the inner circumferential surface of the hole, the fourth region may contact a corner portion at the lower side of the hole.

[0014] Before the cover and connector are joined, the fourth region can be configured to be spaced apart from the second region in the axial direction.

[0015] Before the cover and connector are connected, the fourth region can be set on the virtual line (L) based on the virtual line (L) passing through the second region in the axial direction.

[0016] Alternatively, the hole can be formed with a circular horizontal cross-section, and the shielding terminal can be formed by bending the plate-shaped member. In this case, the hole can be formed in a tapered shape. In this case, since the inner circumferential surface of the hole formed in a tapered shape is in slidable contact with the bent surface, deformation of the shielding terminal may be more likely to occur.

[0017] The cover may include: a cover body; a first cover protrusion extending upward in an axial direction from the outer periphery of the cover body; a second cover protrusion extending downward in an axial direction from the cover body; and a hole formed to pass through the cover body in an axial direction, wherein a bearing may be provided inside the second cover protrusion.

[0018] The motor may also include a busbar disposed on the stator, wherein the busbar may include a busbar body and a plurality of busbar terminals disposed on the busbar body, and each of the busbar terminals is configured such that an end portion passing through a cover can be electrically connected to a power terminal of a connector.

[0019] Beneficial effects

[0020] According to one embodiment, grounding force can be increased using shielding terminals including curved surfaces and holes formed in the cover.

[0021] Furthermore, according to the implementation method, two-point contact can be achieved by inducing deformation of the shielding terminal using the connecting force of the cover and connector. Therefore, the grounding capability of the shielding terminal can be further improved.

[0022] The various useful advantages and effects of the implementation methods are not limited to those described above, and can be more easily understood while describing specific implementation methods. Attached Figure Description

[0023] Figure 1 This is a perspective view of a motor according to an embodiment.

[0024] Figure 2 The illustration shows a cross-sectional perspective view of a motor according to an embodiment.

[0025] Figure 3 This is a cross-sectional view of a motor according to an embodiment.

[0026] Figure 4 This is a view illustrating a cover installed in a motor according to an embodiment.

[0027] Figure 5 This is an exploded view illustrating the arrangement between the cover and the connector in the motor according to an embodiment.

[0028] Figure 6 This is a view illustrating the state of the cover and connector in the motor according to the embodiment before they are connected.

[0029] Figure 7 This is a view illustrating the state after the cover and connector in the motor according to the embodiment are connected.

[0030] Figure 8a and Figure 8b This is a view illustrating the layout and structure of the cover and connector provided in the motor according to an embodiment, wherein, Figure 8a This is a view illustrating the structure of the shielding terminals and their arrangement with the holes before the cover and connector are joined, when the connector's shielding terminals are formed of a ductile material. Figure 8b This is a view illustrating the structure of the shielding terminals and the arrangement of the shielding terminals with the holes before the cover and connector are connected, when the shielding terminals are formed of an elastic material.

[0031] Figure 9 This is a view illustrating a modified example of a cover installed in a motor according to an embodiment. Detailed Implementation

[0032] In the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0033] However, the technical spirit of the present invention is not limited to the several embodiments described and which may be implemented in various different forms, and at least one or more components of the embodiments may be selectively combined, substituted and used within the scope of this technical spirit.

[0034] Furthermore, unless otherwise clearly and specifically defined by the context, all terms used herein (including technical and scientific terms) are to be interpreted as having the meaning commonly understood by those skilled in the art, and the meaning of commonly used terms, such as those defined in common dictionaries, will be interpreted by taking into account the contextual meaning of the relevant art.

[0035] Furthermore, the terminology used in the embodiments of the present invention is for descriptive purposes only and is not intended to limit the invention.

[0036] In this specification, unless the context clearly indicates otherwise, the singular form includes the plural form, and in the case of describing “at least one of A, B and C (or one or more of them)”, this may include at least one combination of all possible combinations of A, B and C.

[0037] In addition, in the description of the components of the present invention, terms such as "first", "second", "A", "B", "(a)" and "(b)" may be used.

[0038] These terms are only used to distinguish one element from another, and the nature, order, etc., of the elements are not limited by these terms.

[0039] Additionally, it should be understood that when an element is referred to as “connected” or “linked” to another element, such a description may include cases where the element is directly connected or linked to the other element, as well as cases where the element is connected or linked to the other element through another element disposed between the element and the other element.

[0040] Additionally, when any element is described as being formed or disposed "above" or "below" another element, such a description includes cases where the two elements are formed or disposed in direct contact with each other, as well as cases where one or more other elements are inserted between the two elements. Furthermore, when an element is described as being formed "above or below" another element, such a description can include cases where one element is formed on the upper or lower side relative to the other element.

[0041] Figure 1 The illustration shows a perspective view of a motor according to an embodiment. Figure 2 The illustration shows a cross-sectional perspective view of a motor according to an embodiment, and Figure 3This illustration shows a cross-sectional view of a motor according to an embodiment. Figures 1 to 3 In this context, the X direction can be the axial direction, and the Y direction can be the radial direction. Furthermore, the axial and radial directions can be perpendicular to each other. In this case, the axial direction can be the longitudinal direction of shaft 500.

[0042] The motor 1 according to the embodiment may include: a housing 100 having a side portion with an opening; a cover 200 disposed on the housing 100; a stator 300 disposed within the housing 100; a rotor 400 disposed inside the stator 300; a shaft 500 rotating together with the rotor 400; a busbar 600 disposed on the stator 300; and a connector 700 disposed on the stator 300. In this case, the term "inward" may refer to a direction toward the center C, and the term "outward" may refer to the opposite direction to "inward".

[0043] Motor 1 can be a motor used in an active roll stabilizer (ARS).

[0044] The housing 100 and the cover 200 can form the exterior of the motor 1. Alternatively, a receiving space can be formed by connecting the housing 100 and the cover 200. Therefore, as... Figure 1 As illustrated, the stator 300, rotor 400, shaft 500, etc., can be disposed within the receiving space. In this case, the shaft 500 is rotatably disposed within the receiving space. Therefore, the motor 1 may also include bearings 10 disposed on the upper and lower portions of the shaft 500.

[0045] The housing 100 can be formed in a cylindrical shape. Additionally, the housing 100 can house the stator 300, rotor 400, etc. In this case, the shape or material of the housing 100 can be varied. For example, the housing 100 can be formed from a metallic material that can withstand high temperatures.

[0046] The cover 200 can be disposed on the opening surface of the housing 100, i.e., disposed on the housing 100, to cover the opening of the housing 100. In this case, the cover 200 can be formed of a metallic material.

[0047] Figure 4 This is a view illustrating a cover installed in a motor according to an embodiment.

[0048] Reference Figure 4 The cover 200 may include a cover body 210, a first cover protrusion 220, a second cover protrusion 230, and a hole 240 formed for grounding. In this case, the cover body 210, the first cover protrusion 220, and the second cover protrusion 230 may be integrally formed.

[0049] The cover body 210 can be used as a cover to cover the opening of the housing 100. Therefore, the cover body 210 can be provided on the opening surface of the housing 100, that is, on the upper part of the housing 100.

[0050] The first cover protrusion 220 can be formed to protrude upward from the outer periphery or edge of the cover body 210, where upward is one direction of the axial direction. Therefore, the first cover protrusion 220 can guide the arrangement of the connector 700. In this case, the first cover protrusion 220 can be referred to as a wall.

[0051] The second cover protrusion 230 can be formed to protrude downward from the central portion of the cover body 210, the downward direction being the opposite of the axial direction. Therefore, the bearing 10 can be disposed inside the second cover protrusion 230. In this case, the second cover protrusion 230 can be referred to as a bearing receiving portion or a cover-like portion. Additionally, the second cover protrusion 230 may include a hole formed in the central portion for accommodating the shaft 500.

[0052] A hole 240 may be formed in the cover body 210 to pass through the cover body 210 in the axial direction. In addition, one side of the shielding terminal 730 may be configured to contact the inner peripheral surface 241 of the hole 240.

[0053] The stator 300 can be disposed inside the housing 100. In this case, the stator 300 can be supported by the inner circumferential surface of the housing 100. Alternatively, the stator 300 can be disposed outside the rotor 400. That is, the rotor 400 can be rotatably disposed inside the stator 300.

[0054] Reference Figure 2 The stator 300 may include a stator core 310, a coil 320 wound around the stator core 310, and an insulator 330 disposed between the stator core 310 and the coil 320.

[0055] The coil 320 that generates the rotating magnetic field can be wound around the stator core 310. In this case, the stator core 310 can be formed as a single core or by connecting multiple separate cores.

[0056] In addition, the stator core 310 can be formed in the form of multiple thin steel plates stacked together, but is not necessarily limited to this. For example, the stator core 310 can also be formed as a single part.

[0057] The stator core 310 may include a yoke (not shown) having a cylindrical shape and a plurality of teeth (not shown) projecting radially from the yoke. Additionally, the coil 320 may be wound around the teeth.

[0058] Insulator 330 insulates the stator core 310 from the coil 320. Therefore, insulator 330 can be disposed between the stator core 310 and the coil 320.

[0059] Therefore, the coil 320 can be wound around the teeth of the stator core 310, which is provided with insulator 330.

[0060] The rotor 400 can be housed inside the stator 300. Additionally, the shaft 500 can be connected to the central portion of the rotor 400.

[0061] The rotor 400 can be configured such that the magnet 420 is coupled to the rotor core 410. For example, the rotor 400 can be configured such that the magnet 420 is disposed on the outer peripheral surface of the rotor core 410.

[0062] Therefore, magnet 420 can form a rotating magnetic field together with coil 320 wound around stator 300. Magnet 420 can be configured such that N pole and S pole are alternately positioned about axis 500 in the circumferential direction.

[0063] Therefore, the rotor 400 rotates due to the electrical interaction between the coil 320 and the magnet 420, and as the rotor 400 rotates, the shaft 500 rotates to generate the driving force of the motor 1.

[0064] Meanwhile, the rotor core 410 of the rotor 400 can be manufactured by connecting multiple separate cores or as a single core comprising a container. In this case, the rotor core 410 can be formed in the form of multiple thin steel plates stacked together.

[0065] like Figure 1 and Figure 2 As shown in the figure, the shaft 500 can be disposed in the housing 100 and rotatably supported by the bearing 100. In addition, the shaft 500 can rotate together with the rotor 400 in the rotation of the rotor 400.

[0066] Busbar 600 can be installed on stator 300.

[0067] In addition, busbar 600 can be electrically connected to coil 320 of stator 300.

[0068] The busbar 600 may include a busbar body 610 and a plurality of busbar terminals 620 disposed on the busbar body 610.

[0069] The busbar body 610 can be a molded portion formed by injection molding of insulating material. Alternatively, the busbar body 610 can be formed in a ring shape.

[0070] Busbar terminal 620 can be formed on busbar body 610 by injection molding. In this case, a portion of busbar terminal 620 can be formed to be exposed on busbar body 610.

[0071] Additionally, one side of the busbar terminal 620 can be electrically connected to the coil 320 of the stator 300. Furthermore, other sides of the busbar terminal 620 can be formed to protrude upwards through the cover 200. Therefore, the other sides of the busbar terminal 620 can be fused together to the power terminal 720 of the connector 700.

[0072] The connector 700 can be mounted on the cover 200 and connected to the cover 200 using a connecting member such as a bolt. That is, the motor 1 has the advantage that the shielding terminal 730 is naturally grounded to the hole 240 of the cover 200 during the assembly of the connector 700 and the cover 200.

[0073] Figure 5 This is an exploded view illustrating the arrangement between the cover and the connector, which are disposed in the motor according to the embodiment. Figure 6 This is a view illustrating the state of the cover and connector before connection, the cover and connector being disposed in the motor according to the embodiment, and Figure 7 This is a view illustrating the state of the cover and connector after connection, the cover and connector being disposed in the motor according to the embodiment.

[0074] Reference Figure 2 and Figure 3 as well as Figures 5 to 7 The connector 700 can be disposed on the cover 200. Additionally, the connector 700 may include a connector body 710 and a plurality of power terminals 720 and shielding terminals 730 disposed on the connector body 710. In this case, the shielding terminal 730 may be referred to as a grounding terminal.

[0075] Therefore, connector 700 can use power terminal 720 to transmit externally applied power to coil 320.

[0076] The connector body 710 can be a molded portion formed of insulating material. In this case, the connector body 710 can serve as a frame for combining the power terminal 720 and the shield terminal 730 into a single component.

[0077] The connector body 710 may include a body portion 711 and a connector portion 712.

[0078] The main body 711 can be mounted on the cover 200.

[0079] The connector portion 712 may be formed to protrude from the body portion 711 in the axial direction. In addition, an external power supply may be connected to the connector portion 712.

[0080] The power terminal 720 and the shielding terminal 730 can be provided on the connector body 710 by injection molding. In this case, a portion of the power terminal 720 and a portion of the shielding terminal 730 can be exposed at the connector body 710.

[0081] The power terminal 720 allows externally applied power to be transmitted to the busbar 600. In this case, the power terminal 720 can be formed of a metallic material.

[0082] One end portion of each power terminal 720 in the power terminal 720 may be configured to face or contact the other side of one of the bus terminals 620 in the bus terminal 620, and be electrically connected to one of the bus terminals 620 in the bus terminal 620 by means of fusion or other means.

[0083] In addition, at least three power terminals 720 can be formed, and the power terminals 720 can be connected to the busbar terminals 620 of the U phase, V phase and W phase.

[0084] The shielding terminal 730 can be configured to contact the cover 200 for grounding. For example... Figure 7 As illustrated, the end portion of the shielding terminal 730, which is exposed at the connector body 710, can contact the inner peripheral surface 241 of the hole 240 for grounding.

[0085] Reference Figure 6 and Figure 7 The shielding terminal 730 may include: a first region 731, which is disposed in the radial direction and has a portion disposed on the connector body 710; a second region 732, which extends axially from the end portion of the first region 731; a third region 733, which extends from the end portion of the second region 732 and has a curved surface 733a; and a fourth region 734, which extends axially from the end portion of the third region 733. In this case, the position of the fourth region 734 can be changed by a reaction force generated by the contact between the curved surface 733a and the inner peripheral surface 241 of the hole 240. Therefore, the fourth region 734 can contact the edge 242 disposed on the lower side of the hole 240. In this case, the curved surface 733a can be formed to have a predetermined curvature.

[0086] like Figure 7As illustrated, when a region of the third region 733 is bent by the reaction force generated by the contact between the inner peripheral surface 241 of the hole 240 and the bent surface 733a, the position of the fourth region 734 can change to an inclined position. Therefore, in addition to the contact between the third region 733 and the inner peripheral surface 241 of the hole 240, a two-point contact structure of the shielding terminal 730 can be achieved by contacting the fourth region 734 with the edge 242 provided on the lower side of the hole 240. Specifically, since the bent surface 733a can be formed with a predetermined curvature, the bent surface 733a of the shielding terminal 730 moves downward while contacting the corner portion on the upper side of the inner peripheral surface 241. Therefore, the shielding terminal 730 bends towards the inside of the hole 240. Furthermore, in addition to the contact between the third region 733 and the inner peripheral surface 241 of the hole 240, a two-point contact structure of the shielding terminal 730 can be achieved by contacting the fourth region 734 with the edge 242 provided on the lower side of the hole 240.

[0087] In other words, during the assembly of connector 700 and cover 200, a portion of the curved surface 733a of the third region 733 can be configured to overlap with the hole 240 in the axial direction. Furthermore, when the fourth region 734 is guided through the hole 240, since a portion of the curved surface 733a of the third region 733 is configured to overlap with the hole 240, the curved surface 733a can contact the inner circumferential surface 241 of the hole 240. Additionally, because a region of the third region 733 is bent by the reaction force generated by the contact between the curved surface 733a and the inner circumferential surface 241 of the hole 240, a side of the fourth region 734 can contact the edge 242 located on the lower side of the hole 240.

[0088] Therefore, when the end portion of the shielding terminal 730 is inserted into the hole 240 via the connecting cover 200 and the connector 700, the grounding force of the shielding terminal 730 can be increased because the two-point structure of the shielding terminal 730 is achieved by a reaction force. For example, the grounding force of the shielding terminal 730 can be increased by achieving the two-point structure through the contact between the curved surface 733a and the inner peripheral surface 241 of the hole 240, and the contact between the fourth region 734 and the edge 242 provided on the lower side of the hole 240.

[0089] Meanwhile, the hole 240 can be formed with a circular horizontal cross-section. Additionally, the shielding terminal 730 can be formed by bending the plate-shaped member. Therefore, the edge of the third region 733 at at least one side can contact the inner peripheral surface 241 of the hole 240 in the circumferential direction. Furthermore, the edge of the fourth region 734 at at least one side can contact the edge 242 disposed on the lower side of the hole 240 in the circumferential direction at at least one side.

[0090] In other words, since the hole 240 is formed in a circular shape and the shielding terminal 730 is formed by bending the plate-shaped member, the hole 240 and the shielding terminal 730 can contact each other at up to four points.

[0091] Additionally, the shielding terminal 730 can be formed of an elastic, ductile, or similar material. For example, the shielding terminal 730 can be formed of low-resistance materials such as gold, silver, and copper to reduce noise from interference sensing. Therefore, the structure of the shielding terminal 730 allows for optimization of the grounding structure by forming its shape according to different materials.

[0092] Figure 8a and Figure 8b This is a view illustrating the structure of the connector installed in the motor according to an embodiment. Figure 8a This is a view illustrating the structure of the shielding terminal 730 and its arrangement with the hole 240 before the cover 200 and connector 700 are connected, when the shielding terminal 730 is formed of a ductile material. Figure 8b This is a view illustrating the structure of the shielding terminal 730 and its arrangement with the hole 240 before the cover 200 and connector 700 are connected, when the shielding terminal 730 is formed of an elastic material.

[0093] In this case, the ductile material can be one that deforms without breaking, even when subjected to a force equal to or greater than the elastic limit of the material. For example, the ductile material can be one whose load (reaction force) applied to the bent surface 733a of the shielding terminal 730 is greater than the load (reaction force) corresponding to the elastic limit. Alternatively, the elastic material can be one whose load (reaction force) applied to the bent surface 733a of the shielding terminal 730 is smaller than the load (reaction force) corresponding to the elastic limit.

[0094] Therefore, a ductile material is one whose deformation remains even when the reaction force (deformation force) is removed, without returning to its original state, because the reaction force is greater than the reaction force (deformation force) corresponding to the elastic limit, and such a ductile material can be called a plastic material. Conversely, an elastic material is one that returns to its original state when the reaction force is removed, because the reaction force is less than the reaction force corresponding to the elastic limit, and such an elastic material can be called an elastically deformable material.

[0095] Reference Figure 8aWhen the shielding terminal 730 is formed of a ductile material, the fourth region 734 can be configured not to overlap with the second region 732 in the axial direction. Therefore, the fourth region 734 and the second region 732 can be formed to have an offset G in the radial direction. Figure 8a As illustrated, the fourth region 734 can be positioned at a distance from the virtual line L passing through the second region 732 in the axial direction. Therefore, when the third region 733 deforms, the fourth region 734 can easily contact the edge 242 located on the lower side of the hole 240, even if the deformation of the third region 733 is smaller than the deformation of the third region 733 of the shielding terminal 730 formed of elastic material.

[0096] Reference Figure 8b When the shielding terminal 730 is formed of an elastic material, the fourth region 734 can be configured to overlap with the second region 732 in the axial direction. Therefore, the fourth region 734 and the second region 732 can be formed without an offset G in the radial direction. Figure 8b As illustrated, the fourth region 734 can be positioned on a virtual line passing through the second region 732 in the axial direction. Therefore, even when the third region 733 undergoes elastic deformation under reaction force, the fourth region 734 can easily contact the edge 242 located on the lower side of the hole 240.

[0097] Figure 9 This is a view illustrating a modified example of a cover installed in a motor according to an embodiment.

[0098] Reference Figure 9 The hole 240 of the cover 200 can be formed in a tapered shape. For example, the hole 240 can be formed in a tapered shape with an upper inner diameter larger than a lower inner diameter. Therefore, the fourth region 734 can more easily contact the edge 242 provided on the lower side of the hole 240. For example, since the inner circumferential surface 241 of the hole 240, which is formed in a tapered shape, is in slidable contact with the curved surface 733a, the fourth region 734 can more easily contact the edge 242 provided on the lower side of the hole 240.

[0099] In particular, when the shielding terminal 730 is formed of a ductile material, even if the deformation of the third region 733 is smaller than that of the third region 733 of the shielding terminal 730 formed of an elastic material, the fourth region 734 can more easily contact the edge 242 provided on the underside of the hole 240 due to its tapered shape.

[0100] Although the present invention has been described above with reference to exemplary embodiments, those skilled in the art will understand that various modifications and variations of the invention can be made without departing from the spirit and scope of the invention as defined by the appended claims.

[0101] Figure Labels

[0102] 1: Motor 100: Housing

[0103] 200: Cover 240: Hole

[0104] 300: Stator; 310: Stator core

[0105] 320: Coil; 330: Insulator

[0106] 400: Rotor; 500: Shaft

[0107] 600: Busbar 700: Connector

[0108] 730: Shielded terminal

Claims

1. A motor comprising: a housing; a cover provided on the housing; a stator provided inside the housing; a rotor provided inside the stator; a shaft coupled to the rotor; and a connector provided on the cover, wherein the connector includes a connector body and a shield terminal provided on the connector body such that a portion of the shield terminal is exposed, the cover is formed of a metal material, and the shield terminal is inserted into and in contact with a hole of the cover, wherein the shield terminal includes: a first region; a second region extending in an axial direction from an end portion of the first region; a third region extending from an end portion of the second region to have a curved surface; and a fourth region extending from an end portion of the third region, wherein the curved surface is provided in contact with an inner peripheral surface of the hole, and wherein the fourth region is in contact with a corner portion at a lower side of the hole when the curved surface is in contact with the inner peripheral surface of the hole. The fourth region and the second region are provided to have an offset amount.

2. The motor of claim 1, wherein, The fourth region is provided on a virtual line (L) passing through the second region in the axial direction based on the virtual line (L).

3. The motor of claim 1, wherein, 4. The motor according to claim 1, wherein: the hole is formed to have a circular horizontal cross section; and the shield terminal is formed by bending a plate-shaped member. The hole is formed in a tapered shape.

5. The motor of claim 4, wherein, The inner peripheral surface of the hole is in slidable contact with the curved surface.

6. The motor of claim 5, wherein, The cover includes:

7. The motor of claim 1, wherein, a cover body; a first cover protruding portion extending in the axial direction from an outer periphery of the cover body to protrude upward; a second cover protruding portion extending in the axial direction from the cover body to protrude downward; and a hole formed to pass through the cover body in the axial direction, wherein a bearing is provided inside the second cover protruding portion.

8. The motor according to claim 1, further comprising a bus bar provided on the stator, the bus bar includes a bus bar body and a plurality of bus bar terminals provided on the bus bar body, and wherein, an end portion of each of the bus bar terminals is provided to be electrically connected to a power terminal of the connector through an end portion of the cover. One end portion of the power terminal is provided to face and be electrically connected to the end portion of the bus bar terminal.

9. The motor of claim 8, wherein, 10. The motor of claim 1, wherein: the connector body includes a body portion provided on the cover and a connector portion formed to protrude from the body portion; and the connector body is formed of an insulating material. An end portion of the shield terminal provided to be exposed at the connector body is in contact with an inner peripheral surface of the hole.

11. The motor of claim 1, wherein, ​ 12. The motor of claim 11, wherein, The end portion of the shield terminal is in contact with a corner portion at a lower side of the hole due to a reaction force generated by contact between a curved surface of the shield terminal and the inner peripheral surface of the hole.

13. The motor of claim 11, wherein, The end portion of the shield terminal is bent to be inclined due to a reaction force generated by contact between a curved surface of the shield terminal and the inner peripheral surface of the hole.

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