Stator and motor

Abstract

A stator according to the present disclosure is a stator provided in a motor, and is provided with: a coil part which is formed in a ring shape so as to surround a rotor provided in the motor, and which has a coil end part; and a shrink tube that covers the coil end portion without covering the inner peripheral portion of the coil end portion, and that leads out a lead wire of the coil portion from the radially inner side of the coil portion.

Description

Technical Field

[0001] This disclosure relates to stators and electric motors. Background Technology

[0002] Japanese Patent Application Publication No. 50-124102 discloses a stator for an electric motor. This stator includes a coil section with coil ends and multiple protective insulating materials (adhesive tapes). The multiple protective insulating materials are laminated on the surface of the coil ends. Summary of the Invention

[0003] When miniaturizing the electric motor, the structure shown in Japanese Patent Application Publication No. 50-124102 is not necessarily preferred.

[0004] The first aspect of this disclosure is a stator, which is a stator of an electric motor, wherein the stator includes: a coil portion formed in an annular shape to surround a rotor of the electric motor and having a coil end; and a shrink tube that covers the coil end without covering the inner periphery of the coil end, and leads of the coil portion extending radially inward from the coil portion.

[0005] The second aspect of this disclosure is an electric motor having the aforementioned stator. Attached Figure Description

[0006] Figure 1 This is an exploded view of the electric motor according to the first embodiment.

[0007] Figure 2 It is an exploded view showing the housing components and the coil tube.

[0008] Figure 3 This is a top view of the stator.

[0009] Figure 4 It is a cross-sectional view showing a portion of the stator.

[0010] Figure 5 This is a top view of the stator in the second embodiment.

[0011] Figure 6 It is a cross-sectional view showing a portion of the stator.

[0012] Figure 7 This is a top view of the stator in variation example 1.

[0013] Figure 8 It is a cross-sectional view showing a portion of the stator. Detailed Implementation

[0014] The prior art, including Japanese Patent Application Publication No. 50-124102, has at least the following problems: The stator end in the axial direction is enlarged by stacking multiple covering members on the surface of the coil end. From the viewpoint of miniaturizing electric motors, stator enlargement is not preferred.

[0015] To address the miniaturization of electric motors, a countermeasure studied was reducing the amount of wire included in the coil section and making the coil end itself smaller. Therefore, it was believed that even considering the aforementioned enlargement, the axial end of the stator could be made relatively small. However, due to the reduction in the amount of wire included in the coil section, there is a problem of reduced motor output.

[0016] Based on the above preliminary description, the first embodiment will be described below.

[0017] (First Implementation)

[0018] Figure 1 This is an exploded view of the electric motor 10 according to the first embodiment.

[0019] like Figure 1 As shown, the motor 10 includes a rotating shaft 12, a rotor 14, and a stator 16 (161). The axial direction DA, which is the extension direction of the rotating shaft 12, includes a first direction DA1 and a second direction DA2, which is the opposite direction to the first direction DA1.

[0020] The rotating shaft 12 is mounted on the rotor 14. The stator 161 is formed in a cylindrical shape to surround the rotor 14. The rotor 14 and the rotating shaft 12 are rotatably disposed inside the stator 161.

[0021] The stator 161 includes a housing component 18, a coil tube 20, a coil section 22, and a pair of shrink tubes 24. Figure 1 The lead wire 26 shown is led out from the coil section 22.

[0022] The housing member 18 is a cylindrical component capable of surrounding the rotor 14. The housing member 18 extends along the axial direction DA. The housing member 18 has ends 18t (18t1, 18t2) along the axial direction DA. The ends 18t include a first end 18t1 in a first direction DA1 and a second end 18t2 in a second direction DA2.

[0023] The housing member 18 (181) can be a magnetic material formed of electromagnetism or the like, or an insulator formed of resin or the like. In this embodiment, the case where the housing member 181 is a magnetic material will be described. The housing member 181 may, for example, have a plurality of electromagnetism plates (not shown) stacked along the axial direction DA, but is not limited to this. Preferably, an insulating layer 28 (see also) is provided on the inner side (inner wall portion 181i) of the housing member 181. Figures 2-4).

[0024] Figure 2 This is an exploded view showing the housing component 181 and the coil tube 20.

[0025] Coil tube 20 supports coil section 22 (see also...) Figure 1 The coil tube 20 is an insulating component. The coil tube 20 is disposed inside the housing member 181. More specifically, the coil tube 20 is disposed inside the housing member 181, where an insulating layer 28 is formed on the inner wall portion 181i. Figure 2 As shown, the coil tube 20 has a tube core 30 and a plurality of partitions 32.

[0026] The core tube 30 is a cylindrical component. The core tube 30 extends along the axial direction DA. The rotor 14 and the rotating shaft 12 described above are disposed inside the core tube 30.

[0027] The maximum dimension L30 of the tube core 30 along the axial direction DA is longer than the dimension L181 of the receiving member 181 along the axial direction DA (L30 > L181). Therefore, the tube core 30 protrudes from the receiving member 181 (see also...). Figure 1 More specifically, the tube core 30 has a protruding portion, namely a protruding wall 34, that protrudes from the receiving member 181. The protruding wall 34 can be formed in an annular (cylindrical) shape covering the entire circumference of the tube core 30. The protruding wall 34 includes a first protruding wall 341 in a first direction DA1 and a second protruding wall 342 in a second direction DA2. Figure 1 As shown, the first protruding wall portion 341 protrudes from the first end portion 18t1 of the receiving member 181 in a first direction DA1. Additionally, the second protruding wall portion 342 protrudes from the second end portion 18t2 of the receiving member 181 in a second direction DA2. Alternatively, one of the first protruding wall portion 341 and the second protruding wall portion 342 may be omitted.

[0028] like Figure 2 As shown, the partition 32 extends along the axial direction DA. The dimension L32 of the partition 32 along the axial direction DA is not limited; for example, it may be approximately the same as the dimension L181 of the receiving member 181 along the axial direction DA (L32≈L181). That is, the error between dimension L32 and dimension L181 can also be within a predetermined error range. Dimensions L32 and L181 can be equal or different within the aforementioned error range.

[0029] Figure 3 This is a top view of stator 161. Figure 3 The image shows a top view of the stator 161 as viewed from the axial direction.

[0030] like Figure 3As shown, multiple partitions 32 (321, 322, ..., 326) protrude from the outer peripheral wall 30p of the bobbin core 30 toward the radial DR outer side of the bobbin core 30 (coil section 22). When viewed axially, the multiple partitions 32 are arranged at intervals along the circumferential DC direction of the bobbin core 30 (coil section 22). For example, multiple partitions 32 can be arranged symmetrically with the center point C of the stator 161 when viewed axially as the axis of symmetry. The number of partitions 32 that the coil bobbin 20 can have is not limited to 6.

[0031] When viewed axially, the coil portion 22 is annular in shape, capable of surrounding the rotor 14 and the rotating shaft 12. The coil portion 22 is formed by wires wound around a plurality of partitions 32. An insulating material (not shown) is filled between the wires forming the coil portion 22. This insulating material is, for example, a cured impregnating agent. The impregnating agent is, for example, a thermosetting impregnating agent such as varnish.

[0032] The coil portion 22 has a coil end 36. As described above, the coil portion 22 is annular when viewed axially. Therefore, the coil end 36 is also annular when viewed axially. The annular coil end 36 has an outer peripheral portion 36p on the radially outer side of DR, an inner peripheral portion 36i on the radially inner side of DR, and a front end portion 36t on the axial side of DA (see also...). Figure 4 ).

[0033] Figure 4 This is a cross-sectional view showing a portion of the stator 161. Figure 4 The middle shows Figure 3 A portion of the cross-section shown by line IV-IV.

[0034] The coil ends 36 (361, 362) include a first coil end 361 and a second coil end 362. The first coil end 361 protrudes from the first end 18t1 of the housing member 181 in a first direction DA1. The second coil end 362 protrudes from the second end 18t2 of the housing member 181 in a second direction DA2.

[0035] like Figure 4 As shown, the dimension of the protruding wall portion 34 in the axial direction DA is preferably greater than the dimension of the portion protruding from the end 18t in the coil end 36 in the axial direction DA.

[0036] More specifically, in Figure 4 Dimensions L341 and L361 are shown. Dimension L341 is the length from the first end 18t1 of the receiving member 181 to the front end 341t along the axial direction DA of the first protruding wall portion 341. Dimension L361 is the length from the first end 18t1 to the front end 36t (361t) along the axial direction DA of the first coil end 361. Dimension L341 is preferably greater than or equal to L361 (L341 ≥ L361). Figure 4 As shown, it is preferable that dimension L341 is longer than dimension L361 (L341 > L361). However, dimension L341 may also be shorter than dimension L361.

[0037] In addition, Figure 4 Dimensions L342 and L362 are shown. Dimension L342 is the dimension along the axial direction DA from the second end 18t2 of the receiving member 181 to the front end 342t of the second protruding wall portion 342. Dimension L362 is the length along the axial direction DA from the second end 18t2 to the front end 36t (362t) of the second coil end 362. Dimension L342 is preferably greater than or equal to L362 (L342 ≥ L362). Figure 4 As shown, it is preferable that dimension L342 is longer than dimension L362 (L342 > L362). However, dimension L342 may also be shorter than dimension L362. In addition, the dimensions L341 and L342 mentioned above may be equal or different.

[0038] A pair of shrink tubes 24 are each formed, for example, from a cylindrical thin-film material (resin material) that has insulating and heat-shrinkable properties. The pair of shrink tubes 24 are mounted on the coil end 36 in such a way that they cover the outer periphery 36p of the coil end 36 and the front end portion 36t along the axial direction DA of the coil end 36. More specifically, the pair of shrink tubes 24 includes a first shrink tube 241 mounted on the first coil end 361 and a second shrink tube 242 mounted on the second coil end 362.

[0039] The first shrink tube 241 covers the outer periphery 36p (361p) of the first coil end 361. Preferably, the first shrink tube 241 covers the entire outer periphery 361p. Furthermore, the first shrink tube 241 extends from the outer periphery 361p of the first coil end 361 toward the inner periphery 36i (361i) of the first coil end 361, and also covers at least a portion of the front end portion 361t of the first coil end 361. Preferably, the first shrink tube 241 covers the entire front end portion 361t, but is not limited thereto.

[0040] The second shrink tube 242 covers the outer periphery 36p (362p) of the second coil end 362. Preferably, the second shrink tube 242 covers the entire outer periphery 362p. Furthermore, the second shrink tube 242 extends from the outer periphery 362p of the second coil end 362 toward the inner periphery 36i (362i) of the second coil end 362, and also covers at least a portion of the front end portion 362t of the second coil end 362. Preferably, the second shrink tube 242 covers the entire front end portion 362t, but is not limited thereto.

[0041] The inner circumference 36i of the coil end 36 is not covered by the shrink tube 24. The lead wire 26 of the coil section 22 is led out from the radially inner side DR of the coil section 22 through the gap between the coil section 22 and the tube core 30. More specifically, the lead wire 26 is led out from the inner circumference 36i of the coil end 36 through the gap between the coil section 22 and the tube core 30. The lead wire 26 is part of the conductor forming the coil section 22. The coil section 22 can be connected to a power source (not shown) for supplying current to the coil section 22 via the lead wire 26.

[0042] According to this embodiment, the stator 161 and the motor 10 equipped with the stator can, for example, achieve the effects described below.

[0043] The outer periphery 36p and the front end portion 36t (at least a portion of the front end portion 36t) of the coil end 36 are covered by the shrink tube 24. The outer periphery 36p and the front end portion 36t are more likely to come into contact with, for example, the housing 181 containing the electromagnet or external foreign objects (dust, water, oil, etc.) compared to the inner periphery 36i. By covering the outer periphery 36p and the front end portion 36t with the shrink tube 24, contact between the coil end 36 and the housing 181, foreign objects, etc., can be effectively prevented. When the entire outer periphery 36p is covered by the shrink tube 24, contact between the outer periphery 36p and foreign objects is even better prevented. Similarly, when the entire front end portion 36t is covered by the shrink tube 24, contact between the front end portion 36t and foreign objects is even better prevented.

[0044] The shrink tube 24, once contracted, can effectively secure the coil end 36. Therefore, the shrink tube 24 can prevent, for example, deformation of the coil end 36 due to its own weight. By suppressing deformation of the coil end 36, it is possible to better prevent, for example, contact between the coil end 36 and the housing member 181.

[0045] According to this embodiment, the coil end 36 can be well protected by a shrink tube 24 having a minimum thickness. That is, for example, when the coil end 36 is covered with adhesive tape, the adhesive tape may peel off from the coil end 36 when the coil end 36 with the adhesive tape is heated during the manufacturing process of the stator 16. Therefore, the coil end 36 may not be well protected by adhesive tape alone. In addition, when cloth is wound around the coil end 36 with adhesive tape to prevent the adhesive tape from peeling off from the coil end 36, the end of the stator 16 becomes larger due to the adhesive tape, cloth, etc. provided on the coil end 36. As a result, the reduction of the amount of wire included in the coil portion 22 can be suppressed and the miniaturization of the stator 16 can be prevented, and the output reduction of the motor 10 equipped with the stator 16 can be suppressed and the miniaturization of the motor 10 can be prevented. In this regard, according to this embodiment, the shrink tube 24 covering the coil end 36 can maintain a tight fit with the coil end 36 even when heated. Therefore, even with a minimal thickness, the shrink tube 24 can effectively protect the coil end 36. Protecting the coil end 36 is achieved through the relatively thin shrink tube 24, thereby suppressing the enlargement of the stator 161 without reducing the amount of wire included in the coil section 22. In other words, the stator 161 of this embodiment is suitable for suppressing a decrease in the output of the motor 10 and for miniaturizing the motor 10.

[0046] The inner circumference 36i of the coil end 36 is not intentionally covered by the shrink tube 24, and the lead wire 26 is led out from the radial inner side (inner circumference 36i) of the coil section 22. As a result, the possibility of interference between the shrink tube 24 and the lead wire 26 can be reduced.

[0047] Lead wire 26 is led out from the inner side (inner circumference 36i) of the radial DR in the coil portion 22. Therefore, for example, it is not necessary to provide a hole in the shrink tube 24 to allow lead wire 26 to be led out from the outer circumference 36p of the coil end 36. As a result, the entire outer circumference 36p can be reliably covered by the shrink tube 24.

[0048] The bobbin core 30 has a protruding wall 34 located between the coil end 36 (coil portion 22) and the rotating shaft 12, rotor 14, etc. The protruding wall 34 includes at least one of a first protruding wall 341 protruding from the receiving member 181 in a first direction DA1 and a second protruding wall 342 protruding from the receiving member 181 in a second direction DA2. This reduces the likelihood of the coil end 36 (coil portion 22) contacting the rotating shaft 12, rotor 14, etc. The axial DA dimension of the protruding wall 34 in the bobbin core 30 is preferably greater than the axial DA dimension of the portion of the coil end 36 protruding from the end 18t of the receiving member 181 (L341≥L361; L342≥L362). This ensures that the coil portion 22, rotating shaft 12, rotor 14, etc., are shielded by the bobbin core 30 including the protruding wall 34. Furthermore, the dimensions L341 of the first protruding wall 341 and L342 of the second protruding wall 342 can be equal or different. In other words, stator 161 can, to some extent, allow for appropriate design changes to dimensions L341 and L342 depending on the circumstances of the manufacturer of stator 161.

[0049] More preferably, the axial dimension DA of the protruding wall portion 34 of the core portion 30 is longer than the axial dimension DA of the portion of the coil end portion 36 that protrudes from the end portion 18t of the receiving member 181 (L341 > L361; L342 > L362). As a result, the possibility of the coil end portion 36 (coil portion 22) coming into contact with the rotating shaft 12, rotor 14, etc. is further reduced.

[0050] The protruding wall portion 34 is formed throughout the entire circumference of the tube core portion 30. As a result, the tube core portion 30, including the protruding wall portion 34, more reliably shields the coil portion 22, the rotating shaft 12, the rotor 14, etc. Therefore, the possibility of the coil end portion 36 (coil portion 22) coming into contact with the rotating shaft 12, the rotor 14, etc., is further reduced.

[0051] The housing component 181 is formed of electromagnet steel. This helps to suppress iron losses generated in the electric motor 10. Furthermore, since the housing component 181 is made of electromagnet steel, a common stator core material (electromagnetic steel sheet, etc.) can be used. This, for example, helps to suppress the increase in the supply cost of the material for the housing component 181.

[0052] An insulating layer 28 is formed on the inner wall portion 181i of the housing member 181, which is made of an alloy (electromagnetic steel). This prevents a short circuit between the housing member 181 and the coil portion 22. Furthermore, if the housing member 181 is made of an insulator such as resin, the aforementioned insulating layer 28 is not required to prevent a short circuit between the housing member 181 and the coil portion 22.

[0053] The shrink tube 24 is heat-shrinkable. Therefore, the shrink tube 24 can be easily shrunk by heating. In this case, for example, there is no need for a pressing member to prevent the adhesive tape provided at the end of the coil from floating. Therefore, the manufacturing method of the stator 161 is simpler than that disclosed in, for example, Japanese Patent Application Publication No. 50-124102.

[0054] The motor 10 equipped with stator 161 can suppress the reduction of output and can be implemented in a relatively small size.

[0055] (Second Implementation)

[0056] The second embodiment will be described below. In the second embodiment, descriptions that are repeated in the first embodiment will be omitted as appropriate. In addition, in the drawings used in the second embodiment, structures that are the same as those described in the first embodiment will be labeled with the same reference numerals.

[0057] Figure 5 This is a top view of the stator 16 (162) according to the second embodiment. Figure 5 The image shows a top view of the stator 162 as viewed from the axial direction. Figure 6 This is a cross-sectional view showing a portion of stator 162. Figure 5 A portion of the VI-VI line section shown is in Figure 6 As shown in the image.

[0058] The stator 162 includes a housing member 18 (182), a coil section 22, and a shrink tube 24. The housing member 182 is cylindrical in shape. The rotating shaft 12 and rotor 14 of the motor 10 can be disposed inside the housing member 182.

[0059] The housing component 182 is a stator core (magnetic body) containing electromagnets, etc. The housing component 182 may have, for example, a plurality of electromagnet plates (not shown) stacked along the axial direction DA, but is not limited thereto.

[0060] The receiving component 182 has teeth 38. The teeth 38 include a plurality of teeth 40. Figure 5 Six teeth 40 are shown, but the number of teeth 40 is not limited to this. Multiple teeth 40 are arranged to surround the rotor 14 when viewed axially. For example, multiple teeth 40 can be arranged point-symmetrically with the center point C of the stator 162 when viewed axially as the axis of symmetry.

[0061] On the circumferential DC direction of the receiving member 182 (coil portion 22), adjacent teeth 40 form grooves 42 between each other. In other words, the receiving member 182 has a plurality of grooves 42 formed by the teeth 38. Although not shown in the figure, an insulating layer is provided on the surface of the grooves 42.

[0062] The coil section 22 is formed by a wire wound around multiple teeth 40. For example... Figure 6 As shown, a portion of the coil section 22 (conductor) is located within a plurality of slots 42. The spaces between the wires forming the coil section 22 are filled with an insulating material (not shown). This insulating material is, for example, a cured impregnating agent.

[0063] like Figure 6 As shown, the coil end 36 of the coil portion 22 protrudes from the housing member 182 along the axial direction DA. The coil end 36 includes a first coil end 361 in a first direction DA1 and a second coil end 362 in a second direction DA2.

[0064] The stator 162 includes a pair of shrink tubes 24, comprising a first shrink tube 241 and a second shrink tube 242. The first shrink tube 241 covers the outer periphery 361p of the first coil end 361 and the front end 361t of the first coil end 361 in a first direction DA1. The second shrink tube 242 covers the outer periphery 362p of the second coil end 362 and the front end 362t of the second coil end 362 in a second direction DA2. Each of the pair of shrink tubes 24 has, for example, insulation and heat shrinkability.

[0065] The inner circumference 36i of the coil end 36 is not covered by the shrink tube 24. The lead wire 26 of the coil part 22 is led out from the inner side (inner circumference 36i) of the radial DR in the coil part 22.

[0066] Stator 16 can be installed on motor 10 (see also) Figure 1 The stator 162 and the motor 10 equipped with the stator can, for example, achieve the effects described below.

[0067] The outer periphery 36p and the front end portion 36t (at least a portion of the front end portion 36t) of the coil end 36 are covered by the shrink tube 24. Therefore, similar to the first embodiment, it is possible to effectively prevent the coil end 36 from contacting the housing member 182, foreign objects, etc. When the outer periphery 36p is completely covered by the shrink tube 24, it is even more effective to prevent the outer periphery 36p from contacting foreign objects. When the front end portion 36t is completely covered by the shrink tube 24, it is even more effective to prevent the front end portion 36t from contacting foreign objects. Furthermore, the shrink tube 24, after shrinking, can effectively fix the coil end 36. Moreover, by using the shrink tube 24, which is a relatively thin component, protection of the coil end 36 can be achieved, thereby suppressing the enlargement of the stator 162 without reducing the amount of wire included in the coil portion 22.

[0068] The inner periphery 36i of the coil end 36 is not intentionally covered by the shrink tube 24, and the lead wire 26 is led out from the radially DR inner side (inner periphery 36i) of the coil portion 22. Therefore, similar to the first embodiment, interference between the shrink tube 24 and the lead wire 26 can be suppressed. Furthermore, it is unnecessary to provide a hole in the shrink tube 24 to allow the lead wire 26 to be led out from the outer periphery 36p of the coil end 36. Therefore, the entire outer periphery 36p can be reliably covered by the shrink tube 24.

[0069] The housing component 182 is a cylindrical stator core comprising an alloy such as electromagnet steel. This helps to suppress iron losses generated in the electric motor 10. Furthermore, since the housing component 182 is made of electromagnet steel, a common stator core material (electromagnetic steel sheet, etc.) can be used. This, for example, helps to reduce the increase in the material supply cost of the housing component 182.

[0070] The housing component (stator core) 182 has teeth 38. The coil portion 22 is provided on the teeth 38. In this case, the coil tube 20 is not required (see the first embodiment).

[0071] An insulating layer (not shown) is provided on the surface of the slot 42. This reduces the possibility of a short circuit between the coil section 22 and the housing member 182.

[0072] The shrink tube 24 is heat-shrinkable. Therefore, the shrink tube 24 can easily shrink, for example, by heating. In this case, for example, there is no need for a pressing member to prevent the adhesive tape provided at the end of the coil from lifting. Therefore, the manufacturing method of the stator 162 is simpler than that disclosed in, for example, Japanese Patent Application Publication No. 50-124102.

[0073] The motor 10 equipped with stator 162 can suppress the reduction of output and can be implemented in a relatively small size.

[0074] The above-described embodiments can also be modified as follows. In the following modifications, descriptions that are repeated in the embodiments are omitted as appropriate. In addition, in the drawings used in the following modifications, structures that are the same as those described in the embodiments are labeled with the same reference numerals.

[0075] (Variation Example 1)

[0076] Figure 7 This is a top view of stator 16 (16A) in variant example 1. Figure 7 The image shows a top view of the stator 16A as viewed from the axial direction. Figure 8 This is a cross-sectional view showing a portion of stator 16A. Figure 7 A portion of the section shown in line VIII-VIII is in Figure 8 As shown in the image.

[0077] Regarding the first embodiment, the protruding wall portion 34 of the coil tube 20 may also be formed only on a portion of the circumferential DC region of the tube core 30. This reduces the amount of material consumed by the coil tube 20. For example, in... Figure 7 , Figure 8 The diagram shows a tube core 30 (tube core 30A) having a protruding wall portion 34 (protruding wall portion 34A) according to this modified example. The protruding wall portion 34A protrudes axially DA from a portion of the tube core 30A in the circumferential direction DC. More specifically, Figure 7 , Figure 8 The protruding wall portion 34A shown protrudes along the first direction DA1 from the portion of the core portion 30A located between the partition portion 322 and the partition portion 323 in the circumferential direction DC.

[0078] In this case, it is preferable that the lead wire 26 is led out at the location corresponding to the protruding wall portion 34. That is, the coil portion 22 has a portion from which the lead wire 26 is led out, namely the lead portion 44. Preferably, the position of the lead portion 44 in the circumferential direction DC corresponds to the position of the protruding wall portion 34A in the circumferential direction DC. For example, Figure 7 As shown, the lead-out portion 44 is included in the portion of the coil portion 22 located between the separator 322 and the separator 323 in the circumferential direction DC. Thus, it is preferable that the position of the lead-out portion 44 overlaps with the position of the protruding wall portion 34A in the circumferential direction DC. By making the position of the lead-out portion 44 overlap with the position of the protruding wall portion 34A in the circumferential direction DC, the possibility of the rotating shaft 12, rotor 14, etc., coming into contact with the lead wire 26 can be reduced.

[0079] (Variation Example 2)

[0080] Although specific illustrations are omitted, the coil section 22 may also include multiple coils. These multiple coils may include, for example, a coil used as a U-phase coil, a coil used as a V-phase coil, and a coil used as a W-phase coil.

[0081] When multiple coils are included in the coil section 22, the coil end 36 can be formed by these multiple coils. In other words, the multiple coils included in the coil section 22 can form a ring-shaped first coil end 361 as a whole. In addition, the multiple coils included in the coil section 22 can form a ring-shaped second coil end 362 as a whole. Thus, regardless of the number of coils included in the coil section 22, the stator 16 can have two shrink tubes 24.

[0082] Furthermore, the coil section 22, which includes multiple coils, can have multiple leads 26 corresponding to the number of coils. For example, the coil section 22 can have leads 26 drawn from the U-phase coil, leads 26 drawn from the V-phase coil, and leads 26 drawn from the W-phase coil.

[0083] Regarding Modification 1, the coil tube 20 may also have multiple protruding wall portions 34A corresponding to the multiple leads 26 (multiple leads 44). For example, the leads 44 of the U-phase coil, the leads 44 of the V-phase coil, and the leads 44 of the W-phase coil may be different in the circumferential direction DC of the tube core 30A. In this case, the coil tube 20 may have protruding wall portions 34A corresponding to the leads 44 of the U-phase coil, the leads 44 of the V-phase coil, and the leads 44 of the W-phase coil.

[0084] When the coil section 22 has multiple leads 44, the positions of the multiple leads 44 and the position of a protruding wall portion 34A can also overlap in the circumferential direction DC. That is, the multiple leads 26 can also be led out at the same positions corresponding to the protruding wall portion 34A. For example, they can also be led out from the position between the separator 322 and the separator 323 in the circumferential direction DC of the coil section 22 (see also...). Figure 7 Multiple leads 26 are drawn out. In this case, not only can the possibility of the rotating shaft 12, rotor 14, etc. coming into contact with multiple leads 26 be reduced, but the number of protruding wall portions 34A can be minimized (one).

[0085] (Variation Example 3)

[0086] As described above, an insulating layer 28 is provided on the inner wall portion 181i of the housing member 181. Furthermore, as described above, an insulating material (not shown) is filled between the wires forming the coil portion 22. This insulating material and the insulating layer 28 can also be formed from the same material (impregnating agent). This helps to suppress the increase in the number of material components.

[0087] (Variation Example 4)

[0088] As described above, the space inside the cylindrical housing 18 includes a coil section 22, a rotor 14, etc. Based on this, the motor 10 may, as needed, also include a housing (not shown) covering the space inside the housing 18. This prevents foreign objects existing outside the motor 10 from entering the inside of the housing 18. The foreign objects are not limited to any particular type, but may include, for example, dust, water, oil, etc.

[0089] For example, the motor 10 may also have a housing capable of covering the entire stator 16. Additionally, for example, as described above, the housing member 18 has a first end 18t1 and a second end 18t2 (see also...). Figure 1 , Figure 6The motor 10 may also have a first housing mounted on the first end 18t1 and a second housing mounted on the second end 18t2. In this case, the first housing and the second housing sandwich the receiving member 18 in the axial direction DA. At least one of the first housing and the second housing may also have one or more holes through which the rotating shaft 12, the lead wire 26, etc. are inserted.

[0090] (Variation Example 5)

[0091] The shape of the housing component 18 or the tube core 30 is not limited to a cylinder, but can also be a square tube. In addition, the shape of the coil portion 22 (coil end 36) when viewed axially is not limited to a ring, and may have corners, for example.

[0092] (A combination of multiple variations)

[0093] The aforementioned variations can also be appropriately combined within a non-contradictory range.

[0094] According to the above embodiments and variations, the stator 16 is adapted to suppress the reduction of the output of the motor 10 and to miniaturize the motor 10.

[0095] Regarding the above-described embodiments, the following notes are further disclosed.

[0096] (Note 1)

[0097] The stator 16 disclosed herein is a stator provided by an electric motor 10, the stator comprising: a coil portion 22 which is formed in a ring shape to surround the rotor 14 provided by the electric motor and has a coil end 36; and a shrink tube 24 which covers the coil end without covering the inner periphery 36i of the coil end, and leads out the lead wire 26 of the coil portion from the radially inner side DR of the coil portion.

[0098] (Note 2)

[0099] According to Appendix 1, the stator includes a coil tube 20 supporting the coil portion, the coil tube including: a cylindrical core portion 30 extending along an axial direction DA; and a plurality of partition portions 32 protruding radially outward from the core portion, the coil portion being formed by wires wound around the plurality of partition portions, the maximum axial dimension L30 of the core portion being longer than the axial dimension L32 of the partition portions.

[0100] (Note 3)

[0101] According to Appendix 2, the stator further comprises: a cylindrical receiving member 181 extending along the axial direction to surround the coil tube, the coil end protruding from the axial end 18t in the receiving member, and the tube core having a protruding wall portion 34 protruding from the end.

[0102] (Note 4)

[0103] According to Appendix 3, the protruding wall portion has: a first protruding wall portion 341 that protrudes from the receiving member toward a first direction DA1, which is one of the axial directions; and a second protruding wall portion 342 that protrudes from the receiving member toward a second direction DA2, which is the other of the axial directions, wherein the axial dimension L341 of the first protruding wall portion is different from the axial dimension L342 of the second protruding wall portion.

[0104] (Note 5)

[0105] According to the stator described in Appendix 3, the protruding wall portion has a first protruding wall portion 341, which protrudes from the receiving member toward a first direction DA1, which is one of the axial directions. The coil portion has a first coil end portion 361, which is the coil end portion formed at the end of the coil portion in the first direction. The axial dimension L341 of the first protruding wall portion is greater than or equal to the axial dimension L361 of the portion of the first coil end portion that protrudes from the receiving member.

[0106] (Note 6)

[0107] According to the stator described in Appendix 5, the protruding wall portion has a second protruding wall portion 342, which protrudes from the receiving member toward a second direction DA2, which is the other direction in the axial direction. The coil portion has a second coil end portion 362, which is the coil end portion formed at the end of the coil portion in the second direction. The axial dimension L342 of the second protruding wall portion is greater than or equal to the axial dimension L362 of the portion of the second coil end portion that protrudes from the receiving member.

[0108] (Note 7)

[0109] According to the stator described in Appendix 3, the protruding wall portion is formed on at least one side of the axial direction of the core tube portion, extending over the entire circumference of the core tube portion.

[0110] (Note 8)

[0111] According to the stator described in Appendix 3, on at least one side of the axial direction of the tube core, the protruding wall is formed in part of the tube core when viewed axially, and the lead wire is led out at a position corresponding to the protruding wall.

[0112] (Note 9)

[0113] According to Appendix 8, the stator has a plurality of leads, which are led out at the same locations corresponding to the protruding wall portions.

[0114] (Postscript 10)

[0115] According to any one of the appendices 3 to 9, the housing component is formed of electromagnetic steel.

[0116] (Postscript 11)

[0117] According to Appendix 10, the stator further comprises an insulating layer 28 formed on the inner wall portion 181i of the housing member.

[0118] (Postscript 12)

[0119] According to any one of the appendices 3 to 9, the housing component is formed of resin.

[0120] (Postscript 13)

[0121] According to Appendix 1, the stator further comprises a cylindrical stator core 182 having teeth 38, and the coil portion is formed by a wire wound around the teeth.

[0122] (Postscript 14)

[0123] According to any one of the notes 1 to 13, the shrink tube is a heat-shrinkable tube.

[0124] (Postscript 15)

[0125] The electric motor 10 of this disclosure has a stator as described in any one of Appendices 1 to 14.

[0126] This disclosure has been described in detail, but it is not limited to the various embodiments described above. Various additions, substitutions, modifications, and partial deletions can be made to these embodiments without departing from the spirit of this disclosure, or from the spirit of this disclosure derived from the content described in the claimed scope and its equivalents. Furthermore, these embodiments can also be implemented in combination. For example, in the embodiments described above, the order of each action and the order of each process are shown as an example, and are not limited thereto. Similarly, the use of numerical values ​​or mathematical formulas in the description of the embodiments described above also applies.

[0127] Symbol Explanation

[0128] 10 electric motors;

[0129] 14 rotors;

[0130] 16, 161, 162, 16A stators;

[0131] 18, 181, 182 contain components;

[0132] 18t end;

[0133] 20 coiled tube;

[0134] 22 coil sections;

[0135] 24 Shrink tubing;

[0136] 26 leads;

[0137] 28 insulation layers;

[0138] 30, 30A tube core;

[0139] 32, 321-326 partition sections;

[0140] 34, 34A protruding from the wall;

[0141] 36 coil ends;

[0142] 36i inner circumference;

[0143] 38 teeth;

[0144] 44. Introduction;

[0145] 181i inner wall section;

[0146] 341 First protruding wall portion;

[0147] 342 Second protruding wall portion;

[0148] 361. End of the first coil;

[0149] 362 Second coil end;

[0150] L30 maximum dimensions;

[0151] Sizes: L32, L341, L342, L361, L362.

Claims

1. A stator for an electric motor, characterized in that, The stator comprises: The coil portion, which is formed in a ring shape to surround the rotor of the electric motor, and has coil ends; and A shrink tube that covers the end of the coil but not the inner circumference of the coil end. The lead wire of the coil section is drawn out from the radially inner side of the coil section.

2. The stator according to claim 1, characterized in that, The stator includes a coil tube that supports the coil section. The coil tube comprises: A cylindrical tube core that extends axially; and Multiple partitions protrude radially outward from the core portion of the tube. The coil portion is formed by wires wound around the plurality of said separators. The maximum axial dimension of the core section of the tube is longer than the axial dimension of the partition section.

3. The stator according to claim 2, characterized in that, The stator further comprises: a cylindrical receiving member that extends along the axial direction to surround the coil tube. The end of the coil protrudes from the axial end of the housing component. The core of the tube has a protruding wall portion that protrudes from the end.

4. The stator according to claim 3, characterized in that, The protruding wall portion has: A first protruding wall portion protrudes from the receiving member toward a first direction that is one of the axial directions; as well as The second protruding wall portion protrudes from the receiving member in a second direction, which is the opposite direction in the axial direction. The axial dimension of the first protruding wall portion is different from the axial dimension of the second protruding wall portion.

5. The stator according to claim 3, characterized in that, The protruding wall portion has a first protruding wall portion that protrudes from the receiving member toward a first direction that is one of the axial directions. The coil portion has a first coil end, which is the coil end formed at the end of the coil portion in the first direction. The axial dimension of the first protruding wall portion is greater than the axial dimension of the portion of the first coil end that protrudes from the receiving member.

6. The stator according to claim 5, characterized in that, The protruding wall portion has a second protruding wall portion that protrudes from the receiving member in a second direction, which is the opposite direction in the axial direction. The coil portion has a second coil end, which is the coil end formed at the end of the coil portion in the second direction. The axial dimension of the second protruding wall portion is greater than the axial dimension of the portion of the second coil end that protrudes from the receiving member.

7. The stator according to claim 3, characterized in that, The protruding wall portion is formed on at least one side of the axial direction of the core tube portion, extending over the entire circumference of the core tube portion.

8. The stator according to claim 3, characterized in that, On at least one side of the axial direction of the tube core, the protruding wall portion is formed as a part of the tube core when viewed axially. The lead wire is led out at the location corresponding to the protruding wall portion.

9. The stator according to claim 8, characterized in that, The coil section has a plurality of leads. Multiple lead wires are led out at the same locations corresponding to the protruding wall portions.

10. The stator according to any one of claims 3 to 9, characterized in that, The housing component is made of electromagnet steel.

11. The stator according to claim 10, characterized in that, The stator also has an insulating layer formed on the inner wall of the housing component.

12. The stator according to any one of claims 3 to 9, characterized in that, The housing component is made of resin.

13. The stator according to claim 1, characterized in that, The stator also has a cylindrical stator core with teeth. The coil portion is formed by winding a wire around the teeth.

14. The stator according to any one of claims 1 to 13, characterized in that, The shrink tube is a heat-shrinkable tube.

15. An electric motor, characterized in that, The stator is provided with any one of claims 1 to 14.

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