Stator and motor

Abstract

Provided is a stator and a motor capable of appropriately arranging a stator with respect to a housing. A stator (10) according to an embodiment includes a stator core (12), a coil (14) provided on the stator core (12) and having a coil portion (14X) protruding in an axial direction (AX) of the stator core (12) from both end surfaces (12F1, 12F2) in the axial direction (AX) of the stator core (12), and a covering resin (16) covering the coil portion (14X). At least one of the both end surfaces (12F1, 12F2) in the axial direction (AX) of the stator core (12) has a portion exposed from the covering resin (16).

Description

Technical Field

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

[0002] Japanese Patent Application Publication No. 2014-110716 discloses a stator having a stator core, coils, and a cover. The coils are disposed on the stator core. The cover surrounds the coil portion (the end of the coil). The coil portion protrudes from the end face in the axial direction of the stator core. Summary of the Invention

[0003] However, the cost of the cover in Japanese Patent Application Publication No. 2014-110716 tends to increase. Therefore, there is a demand to omit the cover. However, if the cover of the stator in Japanese Patent Application Publication No. 2014-110716 is omitted, it is difficult to position the stator in the housing when inserting it into the insertion hole formed in the housing of the motor.

[0004] Therefore, the object of the present invention is to provide a stator and an electric motor in which the stator can be appropriately configured relative to the housing.

[0005] One aspect of the present invention is a stator comprising: a stator core; a coil disposed on the stator core having coil portions protruding in the axial direction from two end faces of the stator core at the same end face in the axial direction; and a coating resin covering the coil portions, wherein a portion of at least one of the end faces of the stator core at the axial direction is exposed from the coating resin.

[0006] Another aspect of the invention is an electric motor comprising a stator and a rotor fixed to a housing having an insertion hole for inserting the stator, wherein the stator comprises: a stator core; a coil disposed on the stator core having coil portions protruding in the axial direction from two end faces of the stator core at the same end faces in the axial direction; and a resin coating covering the coil portions, wherein a portion of at least one of the end faces of the stator core in the axial direction is exposed from the resin coating, and a protrusion protruding into the insertion hole is provided on the housing, the protrusion contacting the end face of the stator core exposed from the resin coating, thereby fixing the position of the stator relative to the housing in the axial direction.

[0007] According to the method of the present invention, the end face exposed from the coated resin can be used as a stop when inserting the stator into the insertion hole of the housing, thereby allowing the stator to be properly positioned relative to the housing. Attached Figure Description

[0008] Figure 1 This is a perspective view of the stator representing the implementation method.

[0009] Figure 2 yes Figure 1Sectional view from direction II-II.

[0010] Figure 3 yes Figure 2 Sectional view in direction III-III.

[0011] Figure 4 This is a diagram showing the state of the stator mounted on the housing of an electric motor.

[0012] Figure 5 Therefore, with Figure 2 The same viewpoint is shown for the stator of variant example 1.

[0013] Figure 6 yes Figure 5 VI-VI view section. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings, following preferred embodiments.

[0015] use Figures 1-3 Stator 10 is described in the implementation method. Figure 1 This is a perspective view of the stator 10 in the embodiment. Figure 2 yes Figure 1 Sectional view from direction II-II. Figure 3 yes Figure 2 Sectional view in direction III-III. The stator 10 has a stator core 12, a coil 14 and a resin coating 16.

[0016] The stator core 12 is formed in a cylindrical shape. One end face 12F1 and the other end face 12F2 of the two end faces in the axial direction of the stator core 12 extend radially along the stator core 12.

[0017] A portion of end face 12F1 is exposed from the coating resin 16. The exposed portion of end face 12F1 from the coating resin 16 lies between the outer peripheral surface 12OS of the stator core 12 and the outer peripheral surface 16OS of the coating resin 16. On the other hand, end face 12F2 is entirely covered by the coating resin 16.

[0018] Coil 14 is disposed on stator core 12. Coil 14 has coil portion 14X. Coil portion 14X protrudes outward from both end faces 12F1 and 12F2 of stator core 12 along the axial direction. Coil portion 14X is commonly referred to as coil end.

[0019] The coating resin 16 is the resin that coats the coil portion 14X. The coating resin 16 is cured. The coating resin 16 is formed, for example, by molding. The cross-sectional shape of the coating resin 16 along the radial direction of the stator core 12 is the same as the radial cross-sectional shape of the stator core 12. Furthermore, in Figures 1-3The example shown illustrates the case where the radial cross-sectional shape of the stator core 12 is circular.

[0020] The outer diameter of the resin coating 16 in contact with end face 12F1 is smaller than the outer diameter of the stator core 12. That is, the resin coating 16 in contact with end face 12F1 is disposed inside the outer peripheral surface 12OS of the stator core 12. Incidentally, a stepped space ST is formed between the outer peripheral surface 16OS of the resin coating 16 in contact with end face 12F1 and the outer peripheral surface 12OS of the stator core 12. Figure 2 ).

[0021] The outer diameter of the resin coating 16 that contacts the end face 12F2 is the same as the outer diameter of the stator core 12. Alternatively, the outer diameter of the resin coating 16 that contacts the end face 12F2 may differ from the outer diameter of the stator core 12 within the allowable tolerance range.

[0022] Next, the electric motor 50 having the stator 10 described above will be explained. Figure 4 This diagram shows the state in which the stator 10 is mounted on the housing 30 of the electric motor 50.

[0023] The electric motor 50 has a stator 10 as described above and a rotor (not shown) fixed to a housing 30. The housing 30 has an insertion hole 30H for inserting the stator 10. A protrusion 32 protruding into the insertion hole 30H is provided on the housing 30. When the stator 10 is inserted into the insertion hole 30H, the protrusion 32 contacts the exposed portion of the end face 12F1 of the stator core 12 exposed from the resin coating 16.

[0024] The motor 50 is manufactured by inserting the stator 10 into the insertion hole 30H of the housing 30 and mounting the inserted stator 10 onto the housing 30.

[0025] When inserting the stator 10 into the insertion hole 30H of the housing 30, firstly, the stator 10 is placed on the clamp 40. Figure 4 In this example, the coated resin 16, which contacts the end face 12F2 of the stator core 12, is placed on the mounting surface of the fixture 40. Then, the stator 10, which is placed on the fixture 40, is inserted from the end face 12F1 of the stator core 12 into the insertion hole 30H of the housing 30.

[0026] During insertion, the protrusion 32 of the housing 30 passes through the stepped space ST between the outer peripheral surface 16OS of the coated resin 16 that contacts the end face 12F1 and the outer peripheral surface 12OS of the stator core 12. Figure 2 Then, the protrusion 32 of the housing 30 contacts the exposed portion of the end face 12F1 of the stator core 12 exposed from the resin coating 16. Thus, in the motor 50, the axial position of the stator 10 relative to the housing 30 is fixed.

[0027] Thus, in this embodiment, the stator 10 can use the end face 12F1 of the stator core 12 exposed from the coated resin 16 as a stop when the stator 10 is inserted into the insertion hole 30H of the housing 30. Therefore, the stator 10 can be appropriately positioned relative to the housing 30.

[0028] Furthermore, with the stator 10 mounted on the housing 30, the resin coating 16 that contacts the end face 12F1 of the stator core 12 and the resin coating 16 that contacts the end face 12F2 of the stator core 12 are in contact with the housing 30. Therefore, compared to the case where the resin coating 16 is not in contact with the housing 30, heat dissipation is improved.

[0029] [Variation Example]

[0030] The above-described embodiments can also be modified as follows.

[0031] (Variation Example 1)

[0032] Figure 5 Therefore, with Figure 2 The same viewpoint is shown for the stator 10 of variant example 1. Figure 6 yes Figure 5 VI-VI view section.

[0033] In this modified example, a notch 16X is provided on the outer peripheral surface 16OS of the coated resin 16 that contacts the end face 12F1 of the stator core 12. The notch 16X extends from the top end of the coated resin 16 in the axial direction AX to the end face 12F1 of the stator core 12.

[0034] like Figure 6 As shown, the number of cuts 16X can be multiple. Alternatively, the number of cuts 16X can be one. When there are multiple cuts 16X, the multiple cuts 16X are spaced apart in the circumferential direction (circumferential direction) of the stator core 12 along the AX axis.

[0035] The outer diameter of the resin coating 16 that contacts the end face 12F1 of the stator core 12 is the same as the outer diameter of the stator core 12. That is, in this modified example, the exposed portion of the end face 12F1 exposed from the resin coating 16 is the portion of the cutout 16X.

[0036] In this modified embodiment, the stator 10 is inserted into the insertion hole 30H of the housing 30 from the end face 12F1 of the stator core 12, similar to the embodiment described above. In this modified embodiment, a protrusion corresponding to the cutout 16X is formed on the housing 30. When the stator 10 is inserted into the insertion hole 30H, this protrusion contacts the exposed portion of the end face 12F1 of the stator core 12 exposed from the coated resin 16 through the cutout 16X. Thus, the position of the stator 10 relative to the axial direction of the housing 30 is fixed. Therefore, similar to the embodiment described above, the end face 12F1 can be used as a stop when the stator 10 is inserted into the insertion hole 30H of the housing 30. As a result, even in this modified embodiment, the stator 10 can be appropriately positioned relative to the housing 30.

[0037] Furthermore, in this modified example, the housing 30 can be guided in a predetermined manner by means of the cut 16X, with the relative angle to the circumferential direction of the axis AX of the stator core 12 being predetermined.

[0038] (Variation Example 2)

[0039] In this modified example, with the stator 10 mounted on the housing 30, the coating resin 16 in contact with the end face 12F1 comes into contact with the housing 30 when the motor 50 reaches a predetermined temperature. Conversely, when the motor 50 has not reached the predetermined temperature, the coating resin 16 in contact with the end face 12F1 does not come into contact with the housing 30. Specifically, the following method can be cited as an example.

[0040] Here, the outer diameter of the resin coating 16 is defined as “D0”, the outer diameter of the stator core 12 is defined as “D1”, the coefficient of linear expansion of the resin coating 16 is defined as “k0”, and the coefficient of linear expansion of the stator core 12 is defined as “k1”. In addition, the temperature of the motor 50 is defined as “t”, and the room temperature is defined as “tr”. Under these definitions, the outer diameter D0t of the resin coating 16 at the specified temperature is given by equation (1) below, and the outer diameter D1t of the stator core 12 at the specified temperature is given by equation (2) below.

[0041] D0t=D0+D0×(t-tr)×k0 · · (1)

[0042] D1t=D1+D1×(t-tr)×k1 · · (2)

[0043] When the outer diameter D0t of the coated resin 16 at a specified temperature and the outer diameter D1t of the stator core 12 at a specified temperature are equal, the above equations (1) and (2) become equal. Therefore, according to the above equations (1) and (2), the following equation (3) holds.

[0044] D0=D1(1+k1(t-tr)) / (1+k0(t-tr)) · · (3)

[0045] According to equation (3) above, when the motor 50 reaches the specified temperature, the coated resin 16 that is in contact with the end face 12F1 can be made to contact the housing 30. In addition, the specified temperature can be, for example, the temperature reached by the motor 50 based on the heat generated during rated operation.

[0046] Thus, according to Modification 2, ventilation can be improved when the motor 50 is below the specified temperature. Furthermore, heat dissipation can be improved when the motor 50 is above the specified temperature.

[0047] (Variation Example 3)

[0048] Alternatively, an exposed portion can be provided on the end face 12F2 of the stator core 12, which protrudes from the coated resin 16. Thus, even if either of the two end faces 12F1 and 12F2 of the stator core 12 in the axial direction becomes one side of the insertion hole 30H of the insertion housing 30, the stator 10 can be appropriately configured relative to the housing 30.

[0049] Furthermore, in the above embodiment, only the end face 12F1 of the two end faces 12F1 and 12F2 of the stator core 12 is provided with an exposed portion protruding from the coated resin 16. In the case of the above embodiment, the operator can visually determine which of the two end faces 12F1 and 12F2 of the stator 10 should be inserted into the insertion hole 30H of the housing 30 based on whether or not there is an exposed portion.

[0050] [invention]

[0051] The inventions that can be understood from the above embodiments and variations are described below as the first invention and the second invention.

[0052] (First Invention)

[0053] The first invention is a stator (10) comprising: a stator core (12); a coil (14) disposed on the stator core (12) having coil portions (14X) protruding in the axial (AX) direction from two end faces (12F1, 12F2) of the stator core (12); and a coating resin (16) covering the coil portions (14X). In this stator (10), at least a portion of one of the end faces (12F1, 12F2) of the stator core (12) in the axial (AX) direction is exposed from the coating resin (16).

[0054] Therefore, the end face (12F1) exposed from the coated resin (16) can be used as a stop when the stator (10) is inserted into the insertion hole (30H) of the housing (30), and as a result, the stator (10) can be properly positioned relative to the housing (30).

[0055] Alternatively, one end face (12F1, 12F2) of the stator core (12) in the axial (AX) direction may be partially exposed from the coating resin (16), while the other end face (12F1, 12F2) of the stator core (12) in the axial (AX) direction may be entirely covered by the coating resin (16). Thus, the operator can visually determine which end face of the stator (10) in the axial direction becomes the side of the insertion hole (30H) of the insertion housing (30) based on whether or not a portion is exposed.

[0056] Alternatively, the cross-sectional shape of the coating resin (16) along the radial direction of the stator core (12) may be the same as the radial cross-sectional shape of the stator core (12). This allows the coating resin (16) to come into contact with the stator core (12).

[0057] Alternatively, the resin coating (16) covering at least one of the coil portions (14X) may be disposed inside the outer peripheral surface (12OS) of the stator core (12), and a portion of the end face (12F1) of the stator core (12) exposed from the resin coating (16) may be the area between the outer peripheral surface (12OS) of the stator core (12) and the outer peripheral surface (16OS) of the resin coating (16). Thus, the area between the outer peripheral surface (12OS) of the stator core (12) and the outer peripheral surface (16OS) of the resin coating (16) can be used as a stop when the stator (10) is inserted into the insertion hole (30H) of the housing (30).

[0058] Alternatively, at least one cutout (16X) may be provided on the outer peripheral surface (16OS) of the resin coating (16) covering at least one of the coil portions (14X), extending from the top end of the resin coating (16) along the axial (AX) direction to a portion of the exposed end face (12F1) of the stator core (12), with a portion of the exposed end face (12F1) of the stator core (12) being the area where the cutout (16X) is located. Thus, the area where the cutout (16X) is located can be used as a stop when the stator (10) is inserted into the insertion hole (30H) of the housing (30). Furthermore, the cutout (16X) allows the housing (30) to be guided in a predetermined manner with the relative angle of the stator core (12) along the axial (AX) circumferential direction.

[0059] (Second Invention)

[0060] The second invention is an electric motor (50) comprising a stator (10) and a rotor fixed on a housing (30) having an insertion hole (30H) for inserting the stator (10). The stator (10) comprises: a stator core (12); a coil (14) disposed on the stator core (12) having coil portions (14X) protruding from two end faces (12F1, 12F2) of the stator core (12) in the axial (AX) direction in the axial (AX) direction; and a coated resin (16) covering the coil portions (14X). In this motor (50), at least one of the two end faces (12F1, 12F2) of the stator core (12) in the axial (AX) direction is exposed from the covering resin (16), and a protrusion (32) is provided on the housing (30) protruding into the insertion hole (30H). The protrusion (32) contacts the end face (12F1) of the stator core (12) exposed from the covering resin (16), thereby fixing the position of the stator (10) relative to the axial (AX) direction of the housing (30).

[0061] Therefore, the end face (12F1) exposed from the coated resin (16) can be used as a stop when the stator (10) is inserted into the insertion hole (30H) of the housing (30), and as a result, the stator (10) can be properly positioned relative to the housing (30).

[0062] Alternatively, a portion of one end facet (12F1, 12F2) of the stator core (12) in the axial (AX) direction may be exposed from the coating resin (16), while the entire other end facet (12F1, 12F2) of the stator core (12) in the axial (AX) direction may be covered by the coating resin (16). Thus, the operator can visually determine which end facet of the stator (10) in the axial direction will become the side of the insertion hole (30H) of the insertion housing (30) based on whether or not a portion is exposed.

[0063] Alternatively, the cross-sectional shape of the stator core (12) in a direction orthogonal to the axis (AX) can be the same as the cross-sectional shape of the coating resin (16). This allows the coating resin (16) to come into contact with the stator core (12).

[0064] Alternatively, the resin coating (16) covering at least one of the coil portions (14X) may be disposed inside the outer peripheral surface (12OS) of the stator core (12), and a portion of the end face (12F1) of the stator core (12) exposed from the resin coating (16) may be the area between the outer peripheral surface (12OS) of the stator core (12) and the outer peripheral surface (16OS) of the resin coating (16). Thus, the area between the outer peripheral surface (12OS) of the stator core (12) and the outer peripheral surface (16OS) of the resin coating (16) can be used as a stop when the stator (10) is inserted into the insertion hole (30H) of the housing (30).

[0065] Alternatively, at least one cut (16X) may be provided on the outer peripheral surface (16OS) of the resin coating (16) covering at least one of the coil portions (14X), extending from the top end of the resin coating (16) along the axial (AX) direction to a portion of the exposed end face (12F1) of the stator core (12), with a portion of the exposed end face (12F1) of the stator core (12) being the area where the cut (16X) is located. Thus, the area where the cut (16X) is located can be used as a stop when the stator 10 is inserted into the insertion hole (30H) of the housing (30). Furthermore, the cut (16X) allows the housing (30) to be guided in a predetermined manner with the relative angle of the stator core (12) along the axial (AX) circumferential direction.

Claims

1. A stator, characterized in that, have: Stator core (12); A coil (14), disposed on the stator core, having coil portions (14X) protruding from both end faces (12F1, 12F2) in the axial (AX) direction of the stator core in the axial direction, respectively; and Coated resin (16) covers the coil portion, At least a portion of one of the two end faces of the stator core in the axial direction is exposed from the coating resin. On the outer peripheral surface of the resin coating covering at least one of the respective coil portions, at least one cut (16X) is provided, extending from the top end of the resin coating in the axial direction to the end face of the exposed stator core portion. The portion of the end face of the stator core exposed from the coated resin is the area where the cut is located.

2. The stator according to claim 1, characterized in that, A portion of one of the two end faces of the stator core in the axial direction is exposed from the coating resin, while the entire other end face of the stator core in the axial direction is covered by the coating resin.

3. The stator according to claim 1 or 2, characterized in that, The cross-sectional shape of the coating resin along the radial direction of the stator core is the same as the cross-sectional shape of the stator core along the radial direction.

4. The stator according to claim 1 or 2, characterized in that, The coating resin covering at least one of the respective coil portions is disposed on the inner side of the outer peripheral surface (12OS) of the stator core. The portion of the end face of the stator core exposed from the coating resin is the area between the outer peripheral surface of the stator core and the outer peripheral surface (16OS) of the coating resin.

5. An electric motor (50) comprising a stator (10) and a rotor fixed to a housing having an insertion hole (30H) for insertion of said stator, wherein, The stator (10) comprises: a stator core; a coil disposed on the stator core, having coil portions protruding from two end faces of the stator core in the axial direction; and a coating resin covering the coil portions. The electric motor is characterized in that, At least a portion of one of the two end faces of the stator core in the axial direction is exposed from the coating resin. The housing is provided with a protrusion (32) that protrudes into the insertion hole. The protrusion contacts the end face of the stator core exposed from the resin coating, thereby fixing the position of the stator relative to the axial direction of the housing. On the outer peripheral surface of the resin coating covering at least one of the respective coil portions, at least one cut is provided, extending from the top end of the resin coating in the axial direction to the end face of the exposed stator core portion. The portion of the end face of the stator core exposed from the coated resin is the area where the cut is located.

6. The electric motor according to claim 5, characterized in that, A portion of one of the two end faces of the stator core in the axial direction is exposed from the coating resin, while the entire other end face of the stator core in the axial direction is covered by the coating resin.

7. The electric motor according to claim 5 or 6, characterized in that, The cross-sectional shape of the stator core in a direction orthogonal to the axial direction is the same as the cross-sectional shape of the coated resin.

8. The electric motor according to claim 5 or 6, characterized in that, The coating resin covering at least one of the respective coil portions is disposed on the inner side of the outer peripheral surface of the stator core. The portion of the end face of the stator core exposed from the coated resin is the area between the outer peripheral surface of the stator core and the outer peripheral surface of the coated resin.

Images