motor

Abstract

The present application can provide a motor including a shaft, a rotor coupled to the shaft, and a stator disposed corresponding to the rotor, wherein the rotor includes: first and second rotor cores arranged in an axial direction; first magnets disposed on an outer circumferential surface of the first rotor core; second magnets disposed on an outer circumferential surface of the second rotor core; a first cover disposed outside the first magnets; and a second cover disposed outside the second magnets; a spacer is disposed between the first and second rotor cores; an end of the first cover and an end of the second cover are disposed to have a gap therebetween in the axial direction; an axial thickness of the spacer is greater than or at least equal to the gap; and the first and second magnets are arranged not to overlap the gap in a radial direction.

Description

Technical Field

[0001] This invention relates to motors. Background Technology

[0002] Electric power steering (EPS) is a device that ensures vehicle steering stability and quickly provides restoring force, enabling the driver to drive the vehicle safely. Based on driving conditions detected by vehicle speed sensors, torque angle sensors, torque sensors, etc., the EPS system uses an electronic control unit (ECU) to drive a motor to control the vehicle's steering shaft.

[0003] The motor includes a stator and a rotor. The rotor includes a rotor core and magnets disposed on the outer surface of the rotor core. Additionally, the rotor may include a cover surrounding the rotor core and the magnets. The cover may be a can-shaped member formed of a metallic material. The cover may include a side cover mounted on one side of the rotor core and another side cover mounted on the other side of the rotor core. A cover comprising two parts will necessarily form a gap between the end of one side cover and the end of the other side cover.

[0004] Therefore, there is a problem that the magnets and core, which are located inside the motor, are exposed to the outside through the gap. In addition, there is a problem that foreign objects are introduced through the gap, and that foreign objects or oxides flow down the gap and contaminate the motor. Summary of the Invention

[0005] The present invention aims to provide a motor in which a gap is prevented between one side cover and another side cover to prevent magnets from being exposed to the outside.

[0006] The objectives to be achieved by this invention are not limited to those described above, and other objectives not described above will be clearly understood by those skilled in the art through the following description.

[0007] Technical solution

[0008] One aspect of the present invention provides a motor including a shaft, a rotor connected to the shaft, and a stator configured to correspond to the rotor. The rotor includes a first rotor core and a second rotor core arranged in an axial direction, a first magnet disposed on an outer peripheral surface of the first rotor core, a second magnet disposed on an outer peripheral surface of the second rotor core, a first cover disposed outside the first magnet, and a second cover disposed outside the second magnet. A spacer is disposed between the first rotor core and the second rotor core. An end of the first cover and an end of the second cover are configured to have a gap in the axial direction between the ends of the first cover and the second cover. The thickness of the spacer in the axial direction is greater than or at least equal to the size of the gap, such that the first magnet and the second magnet do not overlap with the gap in the radial direction.

[0009] Another aspect of the present invention provides a motor including a shaft, a rotor connected to the shaft, and a stator configured to correspond to the rotor. The rotor includes a first rotor core and a second rotor core arranged in an axial direction, a first magnet disposed on an outer peripheral surface of the first rotor core, a second magnet disposed on an outer peripheral surface of the second rotor core, a first cover disposed outside the first magnet, and a second cover disposed outside the second magnet. A spacer is disposed between the first rotor core and the second rotor core. The first cover includes a first extension portion that protrudes further in the axial direction than one end of the first magnet. The second cover includes a second extension portion that protrudes further in the axial direction than one end of the second magnet. The first extension portion is configured to be separated from the second extension portion in the axial direction, and the first and second extension portions are configured to overlap the spacer in the radial direction.

[0010] Another aspect of the present invention provides a motor comprising a shaft, a rotor connected to the shaft, and a stator configured to correspond to the rotor, wherein the rotor includes a first outer peripheral surface, a second outer peripheral surface, and a third outer peripheral surface, the first outer peripheral surface, the second outer peripheral surface, and the third outer peripheral surface are arranged sequentially in an axial direction to form the outermost portion of the rotor, the outer diameter of the second outer peripheral surface is smaller than the outer diameters of the first outer peripheral surface and the third outer peripheral surface, a portion of the second outer peripheral surface is configured to overlap with the first outer peripheral surface and the third outer peripheral surface in a radial direction, and the material of the second outer peripheral surface is different from the material of either the first outer peripheral surface or the third outer peripheral surface.

[0011] The ends of the first cover and the second cover can be configured to overlap with the spacer in the radial direction.

[0012] In the radial direction, the first extension portion may be configured to be separate from the spacer, and the second extension portion may be configured to be separate from the spacer.

[0013] The outer diameter of the spacer can be less than the maximum distance from the center of the shaft to the outer surface of the magnet and greater than the minimum distance from the center of the shaft to the outer surface of the magnet.

[0014] Each of the first rotor core and the second rotor core may include a first hole through which a shaft passes, and the spacer may include a second hole at the center of the spacer, and the inner diameter of the second hole may be larger than the inner diameter of the first hole.

[0015] The spacer may include a first surface and a second surface disposed opposite to each other, the first surface being in contact with one end surface of the first magnet and the second surface being in contact with one end surface of the second magnet.

[0016] Each of the boundary between the first surface and the outer peripheral surface of the spacer, and the boundary between the second surface and the outer peripheral surface of the spacer, can be either a curved surface or an inclined surface.

[0017] The spacer may include a first part, a second part, and a third part divided along the axial direction. The second part may be located on one side of the first part and in contact with the first rotor core. The third part may be located on the other side of the first part and in contact with the second rotor core. The outer diameter of the first part may be larger than the outer diameters of the second and third parts, and the inner diameter of the first cover may be smaller than the inner diameter of the second cover.

[0018] Another aspect of the present invention provides a motor including a shaft, a rotor connected to the shaft, a stator disposed outside the rotor, and a housing disposed outside the stator. The rotor includes a rotor core, a plurality of magnets disposed on the outer peripheral surface of the rotor core, and a can-shaped member disposed outside the plurality of magnets. The can-shaped member includes a first member and a second member disposed in an axial direction, and an end portion of the second member is disposed in the first member.

[0019] The end portions of the first component and the second component may overlap in the radial direction, and the sum of the lengths of the first component and the second component in the axial direction may be greater than the length of the rotor core in the axial direction.

[0020] The first component may include a first part having a cylindrical shape and a second part protruding from the end portion of the first part and having a larger diameter than the first part.

[0021] The second part may be spaced apart from the magnet in the radial direction, the end portion of the second member may be disposed between the second part and the magnet in the radial direction, and the spacing between the second part and each magnet in the magnet may be greater than the thickness of the second member.

[0022] The length of the second component can be greater than the length of the first part in the axial direction.

[0023] The ratio of the length of the first part in the axial direction to the length of the second member in the axial direction can be in the range of 0.4 to 0.6.

[0024] A second part may be formed, which is disposed between and connected to the first and second parts, and the end portion of the third part may be spaced apart from the end portion of the second member.

[0025] The second part may include a first region that does not overlap with the first component and a second region that overlaps with the first component, and the length of the second region in the axial direction may vary depending on the length of the rotor core in the axial direction.

[0026] A first inclined surface tilted to one side may be formed on the end portion of the first member, and a second inclined surface tilted to the side opposite to the tilt of the first inclined surface may be formed on the end portion of the second member.

[0027] The first inclined surface can be set inward, and the second inclined surface can be set outward.

[0028] The length of the first component in the axial direction can be increased outward, and the length of the second component in the axial direction can be increased inward.

[0029] The first inclined surface may have a first inclined angle, the second inclined surface may have a second inclined angle, and the first inclined angle may be equal to the second inclined angle.

[0030] The end portion of the first component may be spaced apart from the end portion of the second component in the radial direction, and an adhesive may be disposed between the first component and the second component.

[0031] Beneficial effects

[0032] According to the implementation method, the advantage is that the spacer prevents the magnet from being exposed to the outside.

[0033] According to the implementation method, since the gaps between the covers are eliminated, it is advantageous to prevent foreign objects from being introduced into the motor or to prevent foreign objects or oxides from flowing downwards.

[0034] According to the implementation method, although two cover pieces are used, the advantage is that the cover piece installation process is easy and the manufacturing cost of the cover piece is reduced compared to a single cover piece because the gap between the cover pieces is eliminated.

[0035] According to the embodiments, by adjusting the length of the can-shaped component in the axial direction, the present invention can be applied to rotors of various sizes. Attached Figure Description

[0036] Figure 1 This is a view illustrating a motor according to a first embodiment.

[0037] Figure 2 It's a diagram. Figure 1 An exploded view of the rotor shown.

[0038] Figure 3 The diagram shows a side cross-sectional view of the rotor.

[0039] Figure 4 This is a front view of the rotor.

[0040] Figure 5The illustration shows a side cross-sectional view of the cover and the spacer.

[0041] Figure 6 It is a plan view illustrating the magnet and rotor core, and showing the range of the outer diameter of the spacer.

[0042] Figure 7 This is a plan view of the rotor when the spacer has the minimum outer diameter.

[0043] Figure 8 This is a plan view of the rotor when the spacer has its maximum outer diameter.

[0044] Figure 9 This is a view illustrating a modified example of a spacer including a curved surface.

[0045] Figure 10 This is a view illustrating another modified example of a spacer that includes regions with different outer diameters.

[0046] Figure 11 The illustration shows a perspective view of the rotor of the motor according to the second embodiment.

[0047] Figure 12 It's a diagram. Figure 11 The exploded perspective view of the rotor shown.

[0048] Figure 13 It is a cross-sectional view along line A-A' of the rotor.

[0049] Figure 14 The illustration shows a cross-sectional view of the rotor based on the modified example.

[0050] Figure 15 It is an enlarged view showing the first end portion and the second end portion.

[0051] Figure 16 The diagram shows a cross-sectional view of the can-shaped component.

[0052] Figure 17 It's a diagram. Figure 16 Enlarged view of the first end portion and the second end portion shown.

[0053] Figure 18 The diagram illustrates the application of adhesive to... Figure 17 A view of the state of the first and second end portions.

[0054] Figure 19 The illustration shows a cross-sectional view of a rotor according to another modified example. Detailed Implementation

[0055] The direction parallel to the longitudinal direction (vertical direction) of the axis will be called the axial direction, the direction passing through the axis and perpendicular to the axial direction will be called the radial direction, and the direction along the circumference of a circle with a radius along the radial direction passing through the axis will be called the circumferential direction.

[0056] Figure 1 This is a view illustrating a motor according to an embodiment.

[0057] Reference Figure 1 The motor according to the embodiment may include a shaft 100, a rotor 200, a stator 300, and a housing 400. In the following, the term "inward" refers to the direction from the housing 400 toward the shaft 100 located at the center of the motor, and the term "outward" refers to the opposite direction to "inward", that is, the direction from the shaft 100 toward the housing 400.

[0058] Shaft 100 can be connected to rotor 200. When electromagnetic interaction occurs between rotor 200 and stator 300 due to the supply current, rotor 200 rotates, and shaft 100 rotates together with rotor 200. Shaft 100 can be connected to the vehicle's steering system, and power can be transmitted to the vehicle's steering system through shaft 100.

[0059] The rotor 200 rotates through electrical interaction with the stator 300. The rotor 200 may be disposed inside the stator 300.

[0060] The stator 300 is disposed outside the rotor 200. The stator 300 may include a stator core 300A, a coil 300B, and an insulating member 300C mounted on the stator core 300A. The coil 300B may be wound around the insulating member 300C. The insulating member 300C is disposed between the coil 300B and the stator core 300A to electrically insulate the stator core 300A from the coil 300B. The coil 300B causes interaction with the magnet 220 of the rotor 200 (see [reference]). Figure 2 The electrical interaction between .

[0061] The housing 400 can be disposed on the outside of the rotor 200 and the stator 300.

[0062] Figure 2 It's a diagram. Figure 1 The exploded view of rotor 200 shown in the figure.

[0063] Reference Figure 2The rotor 200 may include a rotor core 210, a magnet 210, a cover 230, and a spacer 240. The magnet 220 is disposed on the outer side of the rotor core 210. The cover 230 is disposed on the outer side of both the rotor core 210 and the magnet 220. The cover 230 may be a can-shaped component formed of a metallic material. The spacer 240 may be formed of plastic resin. The magnet 220 may be formed by combining multiple unit magnets 220.

[0064] The rotor core 210 may include a first rotor core 210A and a second rotor core 210B. The first rotor core 210A and the second rotor core 210B are arranged axially. The first rotor core 210A and the second rotor core 210B may be configured with an skew angle. A first hole 201 for the shaft 100 to pass through is provided in the first rotor core 210A and the second rotor core 210B. The magnet 220 may be divided into a first magnet 220 and a second magnet 220. The first magnet 220 is disposed on the outer surface of the first rotor core 210A. The second magnet 220 is disposed on the outer surface of the second rotor core 210B. The cover 230 may include a first cover 230A and a second cover 230B. The first cover 230A is configured to surround the first rotor core 210A and the first magnet 220A. The second cover 230B is configured to surround the second rotor core 210B and the second magnet 220B. The first cover 230A is mounted axially on one side of the rotor core 210, and the second cover 230B is mounted on the other side of the rotor core 210.

[0065] The spacer 240 can be disposed axially between the first rotor core 210A and the second rotor core 210B. The spacer 240 can be an annular flat member with a second hole 240a formed therethrough, wherein the shaft 100 passes through the second hole 240a.

[0066] Figure 3 The diagram shows a side cross-sectional view of rotor 200.

[0067] Reference Figure 3 A gap G is formed axially between the end 232A of the first cover 230A and the end 232B of the second cover 230B. The spacer 240 is positioned between the first rotor core 210A and the second rotor core 210B such that the magnet 220 is not exposed to the outside through the gap G.

[0068] The spacer 240 is configured to align with the gap G in the axial direction. The thickness t of the spacer 240 in the axial direction determines the position where one end of each magnet 220 contacts the spacer 240. Therefore, when viewed in the radial direction, the thickness t of the spacer 240 in the axial direction should be greater than or equal to the size of the gap G, such that the gap G does not overlap with the magnet 220. Therefore, the end 232A of the first cover 230A and the end 232B of the second cover 230B are configured in the radial direction to overlap with the spacer 240 in the axial direction.

[0069] The first cover 230A may include a first extension 231A. The first extension 231A is a portion that protrudes further along the axial direction than one end of the first magnet 220A. The second cover 230B may include a second extension 231B. The second extension 231B is a portion that protrudes further along the axial direction than one end of the second magnet 220B.

[0070] The first extension portion 231A and the second extension portion 231B are configured to be separated from each other in the axial direction by a gap G. The first extension portion 231A and the second extension portion 231B are positioned to overlap with the spacer 240 when viewed in the radial direction. Therefore, the magnet 220 is not exposed to the outside through the gap G. At the same time, the first extension portion 231A and the spacer 240 can be configured to be separated from each other in the radial direction. In addition, the second extension portion 231B and the spacer 240 can also be configured to be separated from each other in the radial direction. This is to prevent the ends 232A and 232B of the cover 230 from hooking onto the spacer 240 when the cover 230 is mounted on the rotor core 210.

[0071] Figure 4 The illustration shows a front view of rotor 200, and Figure 5 The illustration shows a side cross-sectional view of the cover 230 and the spacer 240.

[0072] Reference Figure 4 and Figure 5 The rotor 200 may include a first outer peripheral surface S1, a second outer peripheral surface S2, and a third outer peripheral surface S3 arranged sequentially along the axial direction to form the outermost portion of the rotor 200. The first outer peripheral surface S1 may correspond to the outer peripheral surface of the first cover 230A. The second outer peripheral surface S2 may correspond to the outer peripheral surface of the spacer 240. The third outer peripheral surface S3 may correspond to the outer peripheral surface of the second cover 230B. The first outer peripheral surface S1 and the third outer peripheral surface S3 may be formed of a metallic material, and the second outer peripheral surface S2 may be formed of a plastic material.

[0073] The second outer peripheral surface S2 has a stepped shape relative to the first outer peripheral surface S1 and the third outer peripheral surface S3.

[0074] The outer diameter of the first outer peripheral surface S1 is equal to the outer diameter of the third outer peripheral surface S3. The outer diameter D2 of the second outer peripheral surface S2 is smaller than the outer diameter D1 of the first outer peripheral surface S1 or the outer diameter D3 of the third outer peripheral surface S3. Furthermore, a portion of one side of the second outer peripheral surface S2 may be configured to overlap with the first outer peripheral surface S1 in the radial direction. Additionally, a portion of the other side of the second outer peripheral surface S2 may be configured to overlap with the third outer peripheral surface S3 in the radial direction.

[0075] Figure 6 It is a plan view illustrating the magnet 220 and the rotor core 210 within the range of the outer diameter D1 of the illustrated spacer 240.

[0076] Reference Figure 6 The outer diameter D1 of the spacer 240 can correspond to the diameter of the circular track existing between the first circular track O1 and the second circular track O2 in the radial direction around the center C of the rotor 200. In this case, the radius of the first circular track O1 corresponds to the maximum distance L1 from the center C of the rotor 200 to the outer surface of the magnet 220, and the radius of the second circular track O2 corresponds to the minimum distance from the center of the rotor 200 to the outer surface of the magnet 220. The maximum distance L1 from the center C of the rotor 200 to the outer surface of the magnet 220 can be the straight-line distance from the center C of the rotor 200 to the width center P1 of the outer surface of the magnet 220 in the circumferential direction. The minimum distance L2 from the center C of the rotor 200 to the outer surface of the magnet 220 can be the straight-line distance from the center C of the rotor 200 to the end 232A of the outer surface of the magnet 220.

[0077] The range of the outer diameter of the spacer 240 corresponds to the size of the spacer 240, so that the spacer 240 will not interfere when the cover 230 is installed on the rotor core 210, so that the magnet 220 will not be exposed to the outside through the gap G, and so that foreign objects will not be introduced into the rotor 200.

[0078] Figure 7 This is a plan view of the rotor 200 when the spacer 240 has the minimum outer diameter D1.

[0079] Reference Figure 7 When the spacer 240 has a minimum outer diameter D3, i.e., when the outer peripheral surface 241 of the spacer 240 is configured to pass through the end P2 of the outer surface of the magnet 220, the spacer 240 covers most of one side end of the magnet 220, and the spacer 240 allows a portion of the outermost side of the magnet 220 to be exposed when viewed in the axial direction. In this state, the magnet 220 is not exposed to the outside through the gap G, and the spacer 240 does not interfere at all when the cover 230 is mounted on the rotor core 210.

[0080] Meanwhile, a second hole 240a is provided in the central portion of the spacer 240. The second hole 240a is a hole through which the shaft 100 passes. In this case, the inner diameter D7 of the second hole 240a can be larger than the inner diameter D5 of the first hole 201 of the rotor core 210.

[0081] Figure 8 This is a plan view of the rotor 200 when the spacer 240 has the maximum outer diameter D1.

[0082] Reference Figure 8 When the spacer 240 has its maximum outer diameter D6, that is, when the outer peripheral surface 241 of the spacer 240 is configured to pass through the width center P1 of the outer surface of the magnet 220 in the circumferential direction, the spacer 240 covers the entire magnet 220 when viewed in the axial direction. In this state, the magnet 220 is not exposed to the outside at all through the gap G. When the cover 230 is mounted on the rotor core 210, the inner peripheral surface of the cover 230 can be inserted along the outer peripheral surface of the spacer 240. Therefore, the inner peripheral surface of the cover 230 can contact the outer peripheral surface of the spacer 240.

[0083] Figure 9 This is a view illustrating a modified example of a spacer 240 including a curved surface.

[0084] Reference Figure 9 The spacer 240 may include a first surface 242 and a second surface 243 that are opposite to each other. The first surface 242 contacts one end surface of the first magnet 220A. In addition, the second surface 243 contacts one end surface of the second magnet 220B.

[0085] The boundary between the first surface 242 and the outer peripheral surface 241 of the spacer 240 can be a curved surface 245 or an inclined surface.

[0086] The boundary between the second surface 243 and the outer peripheral surface 241 of the spacer 240 can be a curved surface 246 or an inclined surface.

[0087] The curved surface 245 of the spacer 240 blocks the magnet 220 from being exposed due to the gap G to the maximum extent, and the curved surface 245 of the spacer 240 guides the outer peripheral surface 241 of the spacer 240 so that it does not hook onto the cover 230 when the cover 230 is mounted on the rotor core 210.

[0088] Figure 10 This is a view illustrating another modified example of a spacer that includes regions with different outer diameters.

[0089] Reference Figure 10The spacer 240 may include regions with different outer diameters. For example, the spacer 240 may include a first portion 240A, a second portion 240B, and a third portion 240C divided along the axial direction. The second portion 240B is the portion that contacts the first rotor core 210A. The third portion 240C is the portion that contacts the second rotor core 210B. The first portion 240A is disposed axially between the first rotor core 210A and the third rotor core 210A.

[0090] The outer diameter D7 of the first portion 240A can be larger than the outer diameter D8 of the second portion 240B and the outer diameter D9 of the third portion 240C. Therefore, the spacer 240 has a shape in which the outer peripheral surface of the first portion 240A protrudes more than the outer peripheral surfaces of the second portion 240B and the third portion 240C. Furthermore, the outer diameter D7 of the first portion 240A is smaller than the inner diameter of the first cover 230A and the inner diameter of the second cover 230B.

[0091] The spacer 240 with this structure also minimizes the exposure of the magnet 220 due to the gap G, and the spacer 240 with this structure guides the outer peripheral surface 241 of the spacer 240 so that it does not hook onto the cover 230 when the cover 230 is mounted on the rotor core 210.

[0092] Figure 11 The illustration shows a perspective view of the rotor of the motor according to the second embodiment, and Figure 12 It's a diagram. Figure 11 The figure shows an exploded 3D view of the rotor.

[0093] Reference Figure 11 and Figure 12 The rotor 1200 may include a rotor core 1210, a plurality of magnets 1220 and a can-shaped component 1230.

[0094] Rotor core 1210 is coupled to shaft 1100. A plurality of magnets 1220 are coupled to the outer peripheral surface of rotor core 1210. Additionally, a can-shaped member 1230 is disposed outside the magnets 1220. In this configuration, the can-shaped member 1230 secures the magnets 1220 to the rotor core 1210. Furthermore, the can-shaped member 1230 prevents the magnets 1220 from being exposed and provides physical and chemical protection for both the rotor core 1210 and the magnets 1220. The can-shaped member 1230 may include a first member 1231 and a second member 1232. One side of each of the rotor core 1210 and the magnets 1220 is surrounded by the first member 1231, and the other side of each of the rotor core 1210 and the magnets 1220 is surrounded by the second member 1232.

[0095] Figure 13This is a cross-sectional view of rotor 1200 along line AA'.

[0096] Reference Figure 13 The first component 1231 and the second component 1232 are arranged along the axial direction. The first component 1231 and the second component 1232 may each be cylindrical with an open side. The open portions of the first component 1231 and the second component 1232 face each other. The first component 1231 and the second component 1232 form an internal space. The rotor core 1210 and the magnet 1220 are disposed inside the first component 1231 and the second component 1232.

[0097] The end portion of the second member 1232 is inserted into the first member 1231. The end portions of the first member 1231 and the end portions of the second member 1232 overlap in the radial direction.

[0098] The sum of the length L4 of the first component 1231 in the axial direction and the length L5 of the second component 1232 in the axial direction is greater than the length L3 of the rotor core 1210 in the axial direction.

[0099] The first member 1231 surrounds one side of each of the rotor core 1210 and the magnet 1220. In this case, the diameter of the first member 1231 can vary depending on its position in the axial direction. The diameter of the first member 1231 can increase as it approaches the second member 1232.

[0100] The first component 1231 may include a first part 1231a and a second part 1231b with different diameters. The first part 1231a and the second part 1231b may be integrally formed.

[0101] The thickness of the end portion of the first component 1231 can be constant.

[0102] The second member 1232 surrounds another side of the rotor 1200. The second member 1232 forms a space for accommodating the rotor 1200 therein. The second member 1232 may have a cylindrical shape. In this case, the diameter of the second member 1232 may be constant regardless of its position in the axial direction.

[0103] The end portion of the second component 1232 is inserted into the first component 1231.

[0104] The thickness of the end portion of the second component 1232 can be constant.

[0105] Figure 14 The illustration shows a cross-sectional view of a rotor according to another embodiment, and Figure 15 It is an enlarged view showing the first end portion and the second end portion.

[0106] Reference Figure 14 The end portion of the first member 1231 may be inclined. Additionally, the end portion of the second member 1232 may also be inclined. In this case, the inclined portions of the first member 1231 and the second member 1232 may correspond to each other. This is to prevent hooking when the end portion of the second member 1232 is inserted into the first member 1231.

[0107] More specifically, refer to Figure 15 A first inclined surface 1231s may be formed on the end portion of the first member 1231. The first inclined surface 1231s may be disposed inward. The first inclined surface 1231s may be disposed facing the magnet 1220. In this case, the thickness of the first member 1231 decreases as it approaches the end portion of the first member 1231. In addition, the length of the first member 1231 in the axial direction decreases outward. The first inclined surface 1231s may have a first inclination angle ∠a. The first inclination angle ∠a is the angle formed by the first inclined surface 1231s relative to the axial direction.

[0108] A second inclined surface 1232s may be formed on the end portion of the second member 1232. The second inclined surface 1232s is disposed in the opposite direction to the first inclined surface 1231s. The second inclined surface 1232s may be disposed outward. In this case, the thickness of the second member 1232 decreases as it approaches the end portion of the second member 1232. In addition, the length of the second member 1232 in the axial direction increases inward. The second inclined surface 1232s may have a second inclination angle ∠b. The second inclination angle ∠b is the angle formed by the second inclined surface 1232s relative to the axial direction. The first inclination angle ∠a may be equal to the second inclination angle ∠b. At the same time, the first inclination angle ∠a may be different from the second inclination angle ∠b.

[0109] In this invention, when the second member 1232 is inserted into the first member 1231, even if hooking occurs at the end portion, the end portion of the second member 1232 can be guided to the end portion of the first member 1231 by the inclined portion.

[0110] Figure 16 The illustration shows a cross-sectional view of the can-shaped component, and Figure 17 It's a diagram. Figure 16 Enlarged view of the first and second end portions shown in the figure.

[0111] Reference Figure 16 The first component 1231 includes a first part 1231a, a second part 1231b, and a third part 1231c.

[0112] The first part 1231a may have a cylindrical shape. The first part 1231a may include a body and a top surface. The top surface may be bent from the cylindrical body. A hole for a shaft to pass through may be formed in the top surface. The top surface contacts the upper end of the rotor core 1210. The inner circumferential surface of the body may contact the magnet 1220.

[0113] The third portion 1231c can be formed between the first portion 1231a and the second portion 1231b. The diameter of the third portion 1231c can increase from one side of the first portion 1231a toward the second portion 1231b. In this case, the third portion 1231c can connect the first portion 1231a and the second portion 1231b diagonally. However, although not shown in the figure, the third portion can also extend radially from the end portion of the first portion. In this case, the third portion can connect the first portion and the second portion vertically. A stepped portion is formed between the first portion 1231a and the second portion 1231b via the third portion 1231c.

[0114] The second part 1231b extends from the third part 1231c. The second part 1231b has a cylindrical shape. The diameter of the second part 1231b may be larger than the diameter of the first part 1231a. The inner circumferential surface of the second part 1231b may be spaced apart from each of the magnets 1220. (Refer to...) Figure 17 The distance w between the second part 1231b and the magnet 1220 is greater than the thickness tc of the second member 1232. In this case, the end portion of the second member 1232 can be disposed radially between the second part 1231b and the magnet 1220.

[0115] The second part 1231b may include a first region 231ba and a second region 231bb. The first region 231ba and the second region 231bb are integrally formed. The first region 231ba and the second region 231bb are divided according to the overlapping portion of the second member 1232.

[0116] The first region 231ba extends from the third part 231c. In this case, the first region 231ba is a region that does not overlap with the second member 1232 in the radial direction. Additionally, the second region 231bb extends from the first region 231ba. Simultaneously, the second region 231bb overlaps with the second member 1232 in the radial direction. The axial length Lb2 of the second region 231bb can be less than the axial length Lb1 of the first region 231ba. In this case, the axial length Lb2 of the second region 231bb can vary depending on the axial length of the rotor core 1210.

[0117] The second member 1232 may have the following shape: in this shape, the lower surface bends from the body having a cylindrical shape. A hole is formed in the lower surface for the shaft to pass through. The lower surface contacts the lower end of the rotor core 1210. Side surfaces surround the edge of the lower surface. In this case, the inner circumferential surface of the side surface contacts the magnet 1220.

[0118] Further reference Figure 16 The length of the second member 1232 can be greater than the length of the first part 1231a in the axial direction. In this case, the ratio of the length La1 of the first part 1231a in the axial direction to the length La2 of the second member 1232 in the axial direction can be in the range of 0.4 to 0.6. For example, the ratio of the length La1 of the first part 1231a in the axial direction to the length La2 of the second member 1232 in the axial direction can be 0.5. That is, the length La2 of the second member 1232 in the axial direction can be twice the length La1 of the first part 1231a in the axial direction.

[0119] Figure 18 The diagram illustrates the application of adhesive to... Figure 17 A view of the state of the first and second end portions.

[0120] Reference Figure 18 The first component 1231 and the second component 1232 can be airtightly sealed using an adhesive.

[0121] The end portions of the first member 1231 and the second member 1232 overlap in the radial direction. Furthermore, the overlapping portions of the first member 1231 and the second member 1232 are spaced apart from each other. Therefore, a gap can be formed between the first end portion 1101 and the second end portion 1201. In this invention, due to this gap, the process of inserting the second member 1232 into the first member 1231 is easy, but there is a risk that foreign objects may be introduced towards the magnet 1220 through the gap. Therefore, an adhesive can be applied to the gap to prevent the introduction of foreign objects. In particular, the adhesive GB can prevent the introduction of external moisture.

[0122] Adhesive GB can be disposed between the second region 231bb and the second portion 1231b. In this case, adhesive GB can be applied to the entire inner surface of the second region 231bb. Alternatively, adhesive GB can be applied only to a portion of the inner surface of the second region 231bb. In this case, the thickness Tg of adhesive GB in the axial direction is equal to the difference between the spacing W between the first member 1231 and the magnet 1220 and the thickness Tc of the second member 1232.

[0123] Figure 19This is a cross-sectional view of a rotor according to yet another embodiment.

[0124] In the rotor according to this embodiment, only the length of the rotor core in the axial direction is... Figure 14 The rotor cores shown have different lengths in the axial direction, and other components are different. Figure 14 The other components are largely the same. Therefore, the same reference numerals are assigned to the same parts. Figure 14 The same components will be listed, and duplicate descriptions will be omitted.

[0125] The length of the can-shaped part 1230 can be adjusted along the axial direction.

[0126] Reference Figure 19 The length of the can-shaped component 1230 is adjusted to correspond to the axial length of the rotor core 1210. In this case, when with Figure 14 During the comparison, the length of the second member 1232 inserted into the first member 1232 increases. That is, the length of the second region 231bb increases. However, the length of the first region 231ba in the axial direction decreases. In addition, the distance from the end portion of the second member 1232 to the stepped portion 231c decreases. In this case, the length of the second region 231bb in the axial direction can be greater than the length of the first region 231ba in the axial direction.

[0127] As described above, when the canister 1230 is applied to a rotor core having a relatively short length in the axial direction, the overlap length of the first member 1231 and the second member 1232 may decrease. However, when a rotor core having a relatively long length in the axial direction is inserted into the canister 1230, the overlap length of the first member 1231 and the second member 1232 may decrease. However, the length of the rotor core 1210 in the axial direction should be greater than the length of the first member 1231 or the second member 1232 in the axial direction and less than the sum of the lengths of the first member 1231 and the second member 1232 in the axial direction.

[0128] This invention can be applied to rotor cores of various sizes by adjusting the length of the can-shaped part in the axial direction according to the length of the rotor core.

[0129] This invention can be used in various devices used in vehicles or household appliances.

Claims

1. A motor, comprising: axis; Rotor, the rotor being connected to the shaft; as well as Stator, the stator being configured to correspond to the rotor, The rotor includes: a first rotor core and a second rotor core, the first rotor core and the second rotor core being arranged axially; a first magnet, the first magnet being disposed on the outer peripheral surface of the first rotor core; a second magnet, the second magnet being disposed on the outer peripheral surface of the second rotor core; a first cover, the first cover being disposed outside the first magnet; and a second cover, the second cover being disposed outside the second magnet. A spacer is provided between the first rotor core and the second rotor core. The first cover includes a first extension that protrudes further than one end of the first magnet along the axial direction, and the second cover includes a second extension that protrudes further than one end of the second magnet along the axial direction. The first extension portion is configured to be separate from the second extension portion in the axial direction. The first extension portion and the second extension portion are configured to be separated from the spacer in the radial direction.

2. The motor according to claim 1, The outer diameter of the spacer is less than the maximum distance from the center of the shaft to the outer surface of the magnet and greater than the minimum distance from the center of the shaft to the outer surface of the magnet.

3. The motor according to claim 1, in, The rotor includes a first outer peripheral surface, a second outer peripheral surface, and a third outer peripheral surface, which are arranged sequentially along the axial direction to form the outermost part of the rotor. The outer diameter of the second outer peripheral surface is smaller than the outer diameter of the first outer peripheral surface and the outer diameter of the third outer peripheral surface. A portion of the second outer peripheral surface is configured to overlap with the first outer peripheral surface and the third outer peripheral surface in the radial direction, and The material of the second outer peripheral surface is different from the material of either the first outer peripheral surface or the third outer peripheral surface.

4. The motor according to claim 1, wherein, The spacer includes a first part, a second part, and a third part divided along the axial direction. The second part is disposed on one side of the first part and contacts the first rotor core. The third part is located on the other side of the first part and contacts the second rotor core. Wherein, the outer diameter of the first part is greater than the outer diameter of the second part and the outer diameter of the third part, and the inner diameter of the first cover is smaller than the inner diameter of the second cover.

5. The motor according to claim 2, wherein, In the radial direction: The first extension portion is configured to be separate from the spacer; and The second extension is configured to be separate from the spacer.

6. A motor, comprising: axis; Rotor, the rotor being connected to the shaft; A stator, which is disposed on the outside of the rotor; as well as The housing is disposed on the outside of the stator. The rotor includes: a rotor core; a plurality of magnets disposed on the outer peripheral surface of the rotor core; and a can-shaped component disposed on the outside of the plurality of magnets. The can-shaped component includes a first component and a second component arranged along the axial direction, and The end portion of the second component is disposed within the first component. The first component includes a first part and a second part having a diameter larger than the first part. The second part includes a first region that does not overlap with the first part and a second region that overlaps with the first part. Furthermore, the axial length of the second region varies according to the axial length of the rotor core.

7. The motor according to claim 6, wherein: The end portions of the first component and the end portions of the second component overlap in the radial direction; and The sum of the lengths of the first component and the second component in the axial direction is greater than the length of the rotor core in the axial direction.

8. The motor according to claim 6, A first inclined surface inclined to one side is formed on the end portion of the first component, and a second inclined surface inclined to the opposite side to the inclination of the first inclined surface is formed on the end portion of the second component.

9. The motor according to claim 8, in, The first inclined surface is disposed inward, and the second inclined surface is disposed outward.

10. The motor according to claim 9, wherein, The distance between the second part and each magnet in the magnet is greater than the thickness of the second component.

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