electric machine

Abstract

A motor includes a shaft, a rotor coupled to the shaft, and a stator disposed outside the rotor, wherein the stator includes a stator core, insulators disposed on the stator core, coils disposed on the insulators, and insulating members disposed between the insulators in a circumferential direction; each of the insulators includes a body and a guide: each of the coils is disposed on the body, and the guide extends from one side of the body; the guide includes a protrusion formed on an inner circumferential surface thereof and protruding toward a center of the stator, and the protrusion includes a first inclined surface formed in a lower portion thereof.

Description

Technical Field

[0001] This invention relates to an electric motor. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy to obtain rotational force, and it is widely used in vehicles, household appliances, industrial machinery, etc.

[0003] An electric motor may include a housing, a shaft, a stator disposed on the inner circumferential surface of the housing, and a rotor disposed on the outer circumferential surface of the shaft. In this case, an electrical interaction is induced between the stator and the rotor of the motor, thereby causing the rotor to rotate.

[0004] In this case, the stator may include a stator core, coils wound on the stator core, and an insulator disposed between the stator core and the coils. Additionally, the stator may also include insulating sheets disposed between these coils.

[0005] In this case, since the insulating sheets are installed while the stator and the housing are assembled together, it is difficult to assemble these insulating sheets in a uniform position.

[0006] Furthermore, during the process of inserting the insulating sheet between the coils, the insertion of the insulating sheet may be interfered with by the protrusions used to fix the coil to the insulator. Summary of the Invention

[0007] Technical Purpose

[0008] The present invention aims to provide an electric motor that allows for easy assembly of insulators and insertion of insulating sheets.

[0009] The objectives of 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 from the following description.

[0010] Technical solution

[0011] One aspect of the invention provides an electric motor including a shaft, a rotor coupled to the shaft, and a stator configured to correspond to the rotor, wherein the stator includes a stator core, an insulator disposed on the stator core, a coil disposed on the insulator, and an insulating member disposed circumferentially between the insulators, the insulator including a body (on which the coil is disposed) and a guide extending from one side of the body, the guide including a protrusion projecting from an inner surface toward the center of the stator, the lower portion of the protrusion including a first inclined surface.

[0012] The protrusion may include a first side surface facing the body and a second side surface formed on the side opposite to the first side surface, and the first side surface and the second side surface become closer together toward the center of the stator.

[0013] The first side surface may include a first surface extending from the guide and a second surface extending from the first surface, the first surface and the second surface may have different tilt angles, and the first surface and the second surface may form an angle of less than 180° toward the body.

[0014] The first inclined surface may form a first inclination angle with the inner peripheral surface of the guide member to be further away from the center of the stator towards the lower side of the first inclined surface, and the first inclination angle may be in the range of 20° to 50°.

[0015] An insulator may include a first insulator and a second insulator connected to the first insulator. The first insulator may include a first end connected to the second insulator, and the second insulator may include a second end connected to the first insulator. The first end may be disposed inside the second end.

[0016] The stator core may include a yoke and teeth that project radially from the inner circumferential surface of the yoke. A first end may contact the inner circumferential surface of the yoke, while a second end may be spaced apart from the inner circumferential surface of the yoke.

[0017] The first end may include a second inclined surface that contacts the second end, and the second end may include a third inclined surface that complements the second inclined surface.

[0018] The second inclined surface can form a second inclined angle with the inner peripheral surface of the yoke, and the second inclined angle can be smaller than the first inclined angle.

[0019] The ratio of the second tilt angle to the first tilt angle can be in the range of 0.1 to 0.2.

[0020] The first insulator may include a first step that contacts the second end, and the second insulator may include a second step that contacts the first end.

[0021] Beneficial effects

[0022] According to the embodiment, since an inclined surface of the protrusion is formed along the direction of insertion of the insulating sheet, the hooking phenomenon is minimized when the insulating sheet is inserted, and the assemblability of the stator can be improved.

[0023] Furthermore, according to the embodiment, since a structure is provided in which the second insulator is inserted into the first insulator along the inclined surface of the first insulator, the connection between the first and second insulators is easier, and thus the assemblability of the stator can be further improved. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of an electric motor according to an embodiment of the present invention.

[0025] Figure 2 This is a perspective view showing a stator core and an insulator according to an embodiment of the present invention.

[0026] Figure 3 This is an exploded perspective view showing a stator core and an insulator according to an embodiment of the present invention.

[0027] Figure 4 This is a plan view showing a stator core and an insulator according to an embodiment of the present invention.

[0028] Figure 5 It shows along Figure 4 A side view showing the state of line A-A' in the image.

[0029] Figure 6 and Figure 7 It is shown Figure 5 A magnified view of area A in the image.

[0030] Figure 8 This is a side view showing a first insulator according to an embodiment of the present invention.

[0031] Figure 9 This is a plan view showing a first insulator according to an embodiment of the present invention.

[0032] Figure 10 This is a side view showing a second insulator according to an embodiment of the present invention.

[0033] Figure 11 This is a perspective view showing the state in which an insulating member is inserted between insulators according to an embodiment of the present invention. Detailed Implementation

[0034] In the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, specific advantages, and novel features of the invention will become clearer from the exemplary embodiments and the following detailed description taken in conjunction with the accompanying drawings. Furthermore, in the description of the invention, detailed descriptions of related well-known functions that unnecessarily obscure the essence of the invention will be omitted.

[0035] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of the invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term “and / or” includes a combination of multiple associated enumerated items or any one of multiple associated enumerated items.

[0036] Figure 1 This is a side sectional view of a motor according to an embodiment of the present invention.

[0037] Reference Figure 1 The motor according to this embodiment may include a shaft 10, a rotor 20 and a stator 30.

[0038] Shaft 10 can be connected to rotor 20. When current is supplied and electromagnetic interaction occurs between rotor 20 and stator 30, rotor 20 rotates, and shaft 10 rotates together with the rotor. Shaft 10 can be connected to the vehicle's steering shaft to transmit power to the steering shaft.

[0039] The rotor 20 rotates due to the electrical interaction with the stator 30.

[0040] The rotor 20 may include a rotor core and magnets. The rotor core may be formed as a stack of multiple thin, circular steel plates, or as a cylindrical shape. A hole may be provided at the center of the rotor core for the shaft 10 to be attached thereto. Protrusions guiding the magnets may be formed on the outer peripheral surface of the rotor core. The magnets may be attached to the outer peripheral surface of the rotor core. These magnets may be arranged at predetermined intervals along the circumference of the rotor core. The rotor 20 may include a canister member surrounding the magnets to secure the magnets to the rotor core and prevent the magnets from deviating from the rotor core and being exposed.

[0041] The stator 30 may include a stator core 310, an insulator 320, and a coil 330. The insulator 320 is mounted on the stator core 310. The coil 330 is wound around the insulator 320. When electricity is applied to the coil 330, an induced current is generated. The coil 330 causes electrical interaction with the rotor 20.

[0042] Figure 2 This is a perspective view showing a stator core and an insulator according to an embodiment of the present invention. Figure 3 This is an exploded perspective view showing a stator core and an insulator according to an embodiment of the present invention. Figure 4 This is a plan view showing a stator core and an insulator according to an embodiment of the present invention.

[0043] Reference Figures 2 to 4 The stator core 310 includes a yoke 311 and a tooth 312. The yoke 311 may be formed in an arc shape. The tooth 312 may be formed to protrude radially from the inner circumferential surface of the yoke 311. The tooth 312 may be arranged radially around the center of the stator 30. The yoke 311 may be integrally formed with the tooth 312.

[0044] The insulator 320 may include a body 321 and a guide 322. The body 321 is a portion around which a coil 330 is wound. The guide 322 is configured to extend from the outside of the body 321.

[0045] More specifically, such as Figure 3 As shown, the insulator 320 includes a first insulator 320A surrounding the upper part of the stator core 310 and a second insulator 320B surrounding the lower part of the stator core 310. In this case, the first insulator 320A and the second insulator 320B can be connected in the axial direction.

[0046] The first insulator 320A may include a first body 321A and a first guide 322A. The upper portion of the wound coil 330 is disposed on the first body 321A. Furthermore, the first guide 322A extends upward from the outside of the first body 321A. In this case, the first guide 322A may include a first end portion 323A located at its lower end. The first end portion 323A is connected to the second insulator 320B. In this case, the first end portion 323A may protrude further toward the second insulator 320B than the first body 321A.

[0047] Figure 5 It shows along Figure 4 A side view of the state intercepted by line A-A' in the image. Figure 6 and Figure 7 It is shown Figure 5 A magnified view of region A in the image.

[0048] Reference Figure 5 and Figure 6 The inner surface of the first end portion 323A can contact the inner peripheral surface of the yoke portion 311. In this case, the thickness of the first end portion 323A can be less than the thickness of other portions of the first guide 322A. Furthermore, a second inclined surface 323Aa can be formed on the outer surface of the first end portion 323A. In this case, the surface of the first end portion 323A facing the inner peripheral surface of the yoke portion 311 is referred to as the inner surface, and the surface opposite to the inner surface is referred to as the outer surface.

[0049] The second inclined surface 323Aa is further away from the center of the stator 30, facing downwards from the second inclined surface 323Aa. (Refer to...) Figure 7A first tilt angle θ2 is formed between the second tilted surface 323Aa and the inner peripheral surface of the yoke 311. This first tilt angle is an acute angle.

[0050] Furthermore, a first step 324A is formed on the first guide 322A on the upper side of the first end 323A.

[0051] The second insulator 320B may include a second body 321B and a second guide 322B. The second body 321B is coupled to the lower end of the first body 321A. In this case, the coil 330 is configured to be wound around the second body 321B. The second guide 322B extends upward from the outside of the second body 321B. In this case, the second guide 322B is coupled to the lower end of the first guide 322A. Furthermore, the second guide 322B may include a second end portion 323B located at its upper end. In this case, the second end portion 323B is connected to the first end portion 323A.

[0052] The second end portion 323B can be spaced apart from the inner circumferential surface of the yoke portion 311. In this case, the first end portion 323A is disposed between the second end portion 323B and the yoke portion 311. In this case, the first end portion 323A and the second end portion 323B can overlap circumferentially.

[0053] The thickness of the second end portion 323B can be less than the thickness of other portions of the second guide 322B. A third inclined surface 323Ba can be formed on the inner surface of the second end portion 323B. In this case, the third inclined surface 323Ba contacts the second inclined surface 323Aa.

[0054] The third inclined surface 323Ba is further away from the inner circumferential surface of the yoke, facing upwards from the third inclined surface 323Ba. The third inclined surface 323Ba may have an inclination angle corresponding to the second inclined surface 323Aa. In this case, the second end 323B may contact the first step 324A.

[0055] Furthermore, the second guide 322B may include a second step 324B formed on the lower side of the second end 323B. In this case, the first end 323A may contact the second step 324B.

[0056] The insulator 320 has a structure in which a first insulator 320A is connected to the upper side of the stator core 310, a second insulator 320B is connected to the lower part of the stator core 310, and the third inclined surface 323Ba of the second end 323B is slidably connected to the second inclined surface 323Aa of the first end 323A. In this case, sliding may be restricted when the first end 323A contacts the second step 324B, and sliding may be restricted when the second end 323B contacts the first step 324A.

[0057] Figure 2 This is a perspective view showing a stator core and an insulator according to an embodiment of the present invention. Figure 8 This is a side view showing a first insulator according to an embodiment of the present invention. Figure 9 This is a plan view showing a first insulator according to an embodiment of the present invention. Figure 10 This is a side view showing a second insulator according to an embodiment of the present invention.

[0058] Reference Figure 2 and Figure 8 The first guide 322A may include a protrusion 340 projecting from the inner circumferential surface toward the stator center S. In this case, the winding coil 330 is disposed between the protrusion 340 and the first body 321A. The protrusion 340 is a protrusion used to prevent the winding coil 330 from deviating from the body 321A.

[0059] The length of the protrusion 340 in the axial direction may be greater than its width in the circumferential direction. (See reference...) Figure 9 The protrusion 340 may include a first side surface 342 and a second side surface 343 at two sides. The first side surface 342 faces the first body 321A, and the second side surface 343 is disposed in a direction opposite to the first side surface 342. In this case, the first side surface 342 and the second side surface 343 become closer to the stator center S.

[0060] The first side surface 342 may include a first surface 3421 and a second surface 3422. The first surface 3421 and the second surface 3422 may have different tilt angles. In this case, the first surface 3421 and the second surface 3422 may be connected to form a predetermined angle. In this case, the angle formed by the first surface 3421 and the second surface 3422 and facing the first body 321A may be less than 180°. That is, the portion where the first surface 3421 and the second surface 3422 are connected may be recessed to face the first body 321A. In this case, the coil 330 may be disposed on the recess, where the first surface 3421 and the second surface 3422 of the protrusion 340 are connected.

[0061] The protrusion 340 is configured to be circumferentially separated from the first body 321A. Furthermore, the protrusion 340 may be positioned above the first end 323A. In this case, the distance between the protrusion 340 and the first body 321A may be greater than the thickness of the coil 330. Additionally, the height of the protrusion 340 may be greater than the thickness of the coil 330. In this case, the height of the protrusion 340 is its protruding length in the radial direction.

[0062] The protrusion 340 includes a first inclined surface 341 on its lower side. In this case, the lower end of the first inclined surface 341 may extend to the first step 324A. The first inclined surface 341 is further away from the stator center S towards the lower side of the first inclined surface 341. The second tilt angle θ2 may be formed by the inner peripheral surfaces of the first inclined surface 341 and the first guide 322A. In this case, the second tilt angle θ2 may be in the range of 20° to 50°. Preferably, the second tilt angle θ2 may be in the range of 30° to 40°. In this case, the second tilt angle θ2 may be greater than the first tilt angle θ1. Preferably, the ratio of the first tilt angle θ1 to the second tilt angle θ2 may be in the range of 0.1 to 0.2.

[0063] The groove 320Aa can be formed in the inner peripheral surface of the first guide 322A. In this case, the groove 320Aa can be spaced apart from the first body 321A in the circumferential direction.

[0064] A groove 320Aa is formed on the side of the first body 321A opposite to the protrusion 340. The distance between the first body 321A and the groove 320Aa can be shorter than the distance between the first body 321A and the protrusion 340. In this case, the length of the groove 320Aa in the axial direction can be greater than its width. Furthermore, the groove 320Aa can extend to the upper end of the first guide 322A. The groove 320Aa is used to guide the end of the wound coil 330 upward.

[0065] Figure 11 It is a perspective view showing the state of the insulating component inserted into the stator.

[0066] Reference Figure 11 In the motor according to the invention, an insulating member 350 having insulating properties may be disposed between adjacent insulators 320. The insulating member 350 is a member for insulating the insulators 320 and the wound coil 330 from each other. In this case, multiple insulating members 350 are provided. The multiple insulating members 350 are disposed circumferentially between the insulators 320. The insulating member 350 has a plate shape. In this case, the insulating member 350 may be an insulating sheet.

[0067] After the insulators 320 of the stator 30 are assembled and the coils are wound on the insulators 320, the insulating member 350 is provided. In this case, the insulating member 350 is inserted into the stator 30 from the underside of the stator 30.

[0068] In conventional motors, during the insertion of the insulating member 350 between insulators 320, insertion failure may occur when the insulating member 350 hooks onto a protrusion. In such cases, a protrusion is used to prevent deviation of the wound coil (similar to the protrusion 340 of the present invention). Therefore, the problem is that malfunctions and damage to the insulating sheet occur due to snagging. However, in the motor according to the present invention, since the protrusion 340 is formed obliquely along the insertion direction of the insulating member 350, snagging of the insulating sheet can be prevented.

[0069] As described above, an exemplary embodiment of the present invention has been described with reference to the accompanying drawings.

[0070] The above embodiments should be considered illustrative only and not for limiting purposes, and the scope of the invention is defined not by the detailed description but by the appended claims. Furthermore, it should be understood that the scope of the invention includes all modifications and alterations derived from the meaning and scope of the appended claims and their equivalents.

[0071] [Explanation of Labels in the Attached Image]

[0072] 10: Shaft, 20: Rotor, 30: Stator, 310: Stator core, 320: Insulator, 320A: First insulator, 323A: First end, 324A: First step, 323Ab: Second inclined surface, 320B: Second insulator, 323B: Second end, 324B: Second step, 323Bb: Third inclined surface, 330: Coil, 340: Protrusion, 341: First inclined surface, 350: Insulating sheet.

Claims

1. An electric motor, comprising: axis; The rotor is connected to the shaft; as well as The stator is configured to correspond to the rotor. The stator includes: a stator core; a plurality of insulators disposed on the stator core; coils disposed on the insulators; and insulating members disposed circumferentially between the insulators. The insulator includes: a body on which the coil is disposed; and a guide extending from one side of the body. The guide includes a protrusion projecting from the inner circumferential surface toward the center of the stator, and The lower part of the protrusion includes a first inclined surface. The insulator comprises a first insulator and a second insulator assembled together, such that the positions of the protrusions are opposite to each other. The insulating member is inserted from one of the first insulator and the second insulator where the protrusion is not located, toward the other of the first insulator and the second insulator where the protrusion is located. The first inclined surface is formed to be inclined toward the first insulator and the second insulator where the protrusion is not provided.

2. The motor according to claim 1, wherein: The protrusion includes: a first side surface facing the body; and a second side surface formed on the side opposite to the first side surface; and In the direction toward the center of the stator, the first side surface and the second side surface become closer together. The first side surface includes a first surface extending from the guide and a second surface extending from the first surface; The first surface and the second surface have different tilt angles. The first surface and the second surface are oriented toward the body at an angle of less than 180°.

3. The motor according to claim 1, wherein: The first inclined surface forms a first inclination angle with the inner peripheral surface of the guide member, so as to be further away from the center of the stator towards the lower side of the first inclined surface; and The first tilt angle is in the range of 20° to 50°.

4. The motor according to claim 3, wherein: The insulator includes a first insulator and a second insulator connected to the first insulator; The first insulator includes a first end connected to the second insulator; The second insulator includes a second end connected to the first insulator; and The first end is disposed inside the second end.

5. The motor according to claim 4, wherein: The stator core includes a yoke and teeth that project radially from the inner circumferential surface of the yoke; The first end portion contacts the inner peripheral surface of the yoke; and The second end is spaced apart from the inner peripheral surface of the yoke.

6. The motor according to claim 5, wherein: The first end portion includes a second inclined surface that contacts the second end portion; and The second end includes a third inclined surface that is complementary to the second inclined surface.

7. The motor according to claim 6, wherein: The second inclined surface forms a second inclined angle with the inner peripheral surface of the yoke; and The second tilt angle is smaller than the first tilt angle.

8. The motor according to claim 7, wherein: The ratio of the second tilt angle to the first tilt angle is in the range of 0.1 to 0.

2.

9. The motor according to claim 4, wherein: The first insulator includes a first step that contacts the second end; and The second insulator includes a second step that contacts the first end.

10. The motor according to claim 9, wherein: The lower end of the first inclined surface extends to the first step.

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