Motor

Abstract

To easily form a distributed winding coil.SOLUTION: A motor includes a shaft, a rotor, a first stator, and a second stator. The first stator includes a plurality of first yoke portions, a plurality of first magnetic pole portions, a connecting portion that connects the plurality of first yoke portions in a circumferential direction, and a gap portion formed between the plurality of first magnetic pole portions adjacent in the circumferential direction. Each of the second stators includes a second yoke portion and a second magnetic pole portion. The second stator is arranged in the gap portion.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a motor. [Background technology]

[0002] 2. Description of the Related Art In rotating electrical machines such as motors, a distributed winding technique is known in which a coil is formed by winding wire around a plurality of teeth (magnetic pole portions). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-274808 A [Patent Document 2] JP 2010-246342 A [Patent Document 3] JP 2017-169419 A Summary of the Invention [Problem to be solved by the invention]

[0004] For example, when the number of magnetic pole parts is increased to receive magnetic flux from a magnet, some magnetic pole parts may not have coils wound around them in a distributed winding motor. In this case, the magnetic pole parts on which the coils are not wound may become an obstacle when winding the nozzle or inserting the already-wound bobbin coil, and so there is a demand for a motor that can be easily formed when arranging coils using the distributed winding method.

[0005] One aspect of the present invention is to provide a motor that can be easily formed with distributed winding coils. [Means for solving the problem]

[0006] In one embodiment, a motor includes a shaft, a rotor, a first stator, and a second stator, the first stator including a plurality of first yoke portions, a plurality of first magnetic pole portions, a connecting portion that connects the plurality of first yoke portions in a circumferential direction, and a gap portion formed between the plurality of first magnetic pole portions adjacent in the circumferential direction. an insulating member; and a first coil disposed on the first magnetic pole portions via the insulating member; The second stator has , No. The second stator has a second yoke portion and a second magnetic pole portion. The second stator is disposed in the gap portion. The first coil is disposed across one circumferential end face of the first magnetic pole portion and the other circumferential end face of another first magnetic pole portion adjacent to the other circumferential side of the first magnetic pole portion.

[0007] According to one aspect, a distributed winding coil can be easily formed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a top view illustrating an example of a motor according to an embodiment. [Diagram 2] FIG. 2 is a perspective view illustrating an example of a stator in the embodiment. [Diagram 3] FIG. 3 is a perspective view showing an example of attachment of a second stator to a first stator in the embodiment. [Figure 4] FIG. 4 is an exploded perspective view illustrating an example of a first stator and an insulator in the embodiment. [Diagram 5] FIG. 5 is a top view illustrating an example of the first stator in the embodiment. [Figure 6] FIG. 6 is a perspective view illustrating an example of a first stator to which an insulator is attached in the embodiment. [Figure 7] FIG. 7 is a perspective view showing an example of attachment of the first coil to the first stator in the embodiment. [Figure 8] FIG. 8 is a perspective view illustrating an example of a first stator to which a first coil is attached in the embodiment. [Figure 9] FIG. 9 is a perspective view showing an example of attachment of the second coil to the first stator in the embodiment. [Figure 10]FIG. 10 is a perspective view illustrating an example of a first stator to which a second coil is attached in the embodiment. [Figure 11] FIG. 11 is an exploded perspective view illustrating an example of a first stator and a retainer in the embodiment. [Figure 12] FIG. 12 is an enlarged cross-sectional view showing an example of mounting the second stator to the first stator in the embodiment. [Figure 13] FIG. 13 is a cross-sectional view illustrating an example of a stator in the embodiment. [Figure 14] FIG. 14 is an enlarged cross-sectional view showing an example of a relationship between a first stator and a second stator in the embodiment. [Figure 15] FIG. 15 is a schematic diagram showing an example of a coil arrangement in the embodiment. [Figure 16] FIG. 16 is a schematic diagram showing an example of the arrangement of coils in the first modified example. [Figure 17] FIG. 17 is a perspective view showing an example of a stator in the second modified example. [Figure 18] FIG. 18 is a perspective view showing an example of mounting of the second stator in the second modified example. [Figure 19] FIG. 19 is a top view of the first coil in the second modified example. [Figure 20] FIG. 20 is a perspective view showing an example of a first coil disposed in a first stator in the second modified example. [Figure 21] FIG. 21 is a side view showing an example of a first coil disposed in a first stator in the second modified example. [Figure 22] FIG. 22 is an exploded perspective view showing an example of a first stator and a retainer in the second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the motor disclosed in the present application will be described in detail with reference to the drawings. Note that the dimensional relationships of the elements in the drawings, the ratios of the elements, and the like may differ from reality. The drawings may also include parts with different dimensional relationships and ratios. In order to make the description easier to understand, each drawing may show a coordinate system in which the direction in which a shaft 99, which will be described later, extends is the axial direction, and the direction in which a rotor 90 rotates is the circumferential direction.

[0010] (Embodiment) FIG. 1 is a top view showing an example of a motor in an embodiment. FIG. 2 is a perspective view showing an example of a stator in an embodiment. The motor 1 shown in FIG. 1 includes, for example, a stator 2 shown in FIG. 2, a rotor 90, and a shaft 99. The motor 1 described in each embodiment is an inner rotor type brushless motor. The motor 1 includes, for example, a rotor 90 having a plurality of magnets 91 as a component, and a rotating shaft (shaft) 99 is coupled to the rotor 90. The motor 1 is housed, for example, in a frame (not shown).

[0011] 1 and 2, the stator 2 in the embodiment includes a first stator 10, a second stator 20, a pair of insulators 31 and 32 which are an example of insulating members, a plurality of first coils 41 to 46, a plurality of second coils 51 to 56, and a pair of retainers 61 and 62. In the following, when the plurality of first coils 41 to 46 are expressed without distinction, they may be referred to as a first coil 40. Similarly, in the following, when the plurality of second coils 51 to 56 are expressed without distinction, they may be referred to as a second coil 50.

[0012] In the embodiment, the first stator 10 includes a pair of connecting portions 11 and 12, twelve first yoke portions 13, and twelve first magnetic pole portions 16, which will be described later. Note that in Fig. 1 and Fig. 2, the first magnetic pole portions 16 are covered by a pair of insulators 31 and 32 and cannot be seen.

[0013] In the embodiment, the first coil 40 and the second coil 50 are, for example, bobbin coils made of pre-wound rectangular copper wire. The first coil 40 and the second coil 50 are disposed close to the first stator 10 to which the insulators 31 and 32 are attached. In the embodiment, the first coil 40 and the second coil 50 are distributed winding coils disposed across a plurality of first magnetic pole portions 16.

[0014] In the embodiment, the first coil 40 and the second coil 50 are not wound around the second stator 20. The second stator 20 in the embodiment is attached, for example, after the first coil 40 and the second coil 50 are arranged on the first stator 10. FIG. 3 is a perspective view showing an example of attachment of the second stator to the first stator in the embodiment. In the embodiment, the second stator 20 is attached from the outside in the radial direction to a gap G formed between two adjacent first magnetic pole portions 16. For example, as shown in FIG. 3, the second stator 20a is attached to a gap Gab formed between the first magnetic pole portion 16a and the first magnetic pole portion 16b.

[0015] In this way, when the second stator 20 is attached after the first coil 40 and the second coil 50 are arranged, the second stator 20 does not get in the way when the first coil 40 and the second coil 50 are arranged on the first stator 10. This improves the workability when arranging the distributed winding coil.

[0016] In the embodiment, first, a pair of insulators 31 and 32 are attached to the first stator 10. FIG. 4 is an exploded perspective view showing an example of the first stator and the insulators in the embodiment. In the embodiment, the connecting parts 11 and 12 are annular members formed of a magnetic material such as stainless steel or electromagnetic steel plate. As shown in FIG. 4, the connecting parts 11 and 12 have approximately the same shape. Note that the material of the connecting parts does not matter as long as it can connect and hold the first yoke part. Also, the connecting parts 11 and 12 may be provided integrally with the first stator or may be provided separately.

[0017] First yoke portion 13 is a member formed, for example, by stacking electromagnetic steel sheets in the axial direction. As shown in Fig. 4, the multiple first yoke portions 13 are disposed adjacent to each other in the circumferential direction. Hereinafter, when the multiple first yoke portions 13 need to be distinguished from one another, they may be referred to as first yoke portions 13a to 13l, respectively.

[0018] An end portion of the first yoke portion 13 on the negative axial direction side is connected to the connecting portion 11. Similarly, an end portion of the first yoke portion 13 on the positive axial direction side is connected to the connecting portion 12. For example, the end portion 11a of the first yoke portion 13a is connected to the connecting portion 11, and the end portion 12a is connected to the connecting portion 12. In other words, the twelve first yoke portions 13 are arranged side by side in the circumferential direction by the pair of connecting portions 11 and 12.

[0019] The multiple first magnetic pole portions 16 are formed integrally with the first yoke portion 13, and are protrusions extending radially inward from the inner circumferential surface side of the first yoke portion 13. Hereinafter, when the multiple first magnetic pole portions 16 need to be distinguished from one another, they may be referred to as first magnetic pole portions 16a to 16l, respectively.

[0020] Fig. 5 is a top view showing an example of the first stator in the embodiment. As shown in Fig. 4 and Fig. 5, the first magnetic pole portion 16 in the first embodiment has a shape that does not include an end portion protruding in the circumferential direction on the tip side (inner side in the radial direction), for example.

[0021] 4 and 5, a gap G is formed between two first yoke portions 13 adjacent in the circumferential direction. For example, gap Gab described in FIG. 3 is formed between first yoke portion 13a and first yoke portion 13b, and gap Gla is formed between first yoke portion 13l and first yoke portion 13a. Both axial ends of gap Gab are sandwiched between portions 11ab and 12ab of coupling portions 11 and 12, and both axial ends of gap Gla are sandwiched between portions 11la and 12la of coupling portions 11 and 12.

[0022] 4, recesses 14 and 15, each of which is partially recessed in the radial direction, are formed on both circumferential ends of the outer circumferential surface of each first yoke portion 13. As shown in FIG 4, the circumferential end face of recess 15a and the circumferential end face of recess 14b face each other with a gap Gab therebetween.

[0023] 5, an end face 17 of a first magnetic pole portion 16 in the circumferential direction and an end face 18 of an adjacent first magnetic pole portion 16 on the opposite side in the circumferential direction face each other across a gap portion G. For example, an end face 17a of a first magnetic pole portion 16a and an end face 18b of a first magnetic pole portion 16b face each other across a gap portion Gab.

[0024] In the embodiment, the insulator 31 is attached to the first stator 10 from the negative axial direction. Similarly, the insulator 32 is attached to the first stator 10 from the positive axial direction. The insulators 31 and 32 are formed of, for example, resin. As shown in FIG. 4, in the embodiment, the insulator 32 has substantially the same shape as the insulator 31. That is, the first stator 10 to which the insulators 31 and 32 are attached in the embodiment has a substantially symmetrical shape in the axial direction.

[0025] As shown in Fig. 4, the insulator 31 in the embodiment includes a connecting portion 33 and twelve protruding portions 35. The connecting portion 33 is an annular member and covers the connecting portion 11 of the first stator 10 from the negative circumferential side. Each protruding portion 35 covers each first yoke portion 13 of the first stator 10 from the radially inner side. Each protruding portion 35 also covers the end face 17 and the end face 18 of the first magnetic pole portion 16 from both sides in the circumferential direction. Similarly, the insulator 32 in the embodiment includes a connecting portion 34 and twelve protruding portions 36.

[0026] Fig. 6 is a perspective view showing an example of a first stator to which an insulator is attached in the embodiment. In the first embodiment, the first coil 40 and the second coil 50 are arranged on the first stator 10 to which the insulators 31 and 32 as shown in Fig. 6 are attached, as shown in Figs. 1 and 2.

[0027] FIG. 7 is a perspective view showing an example of the attachment of the first coil to the first stator in the embodiment. FIG. 8 is a perspective view showing an example of the first stator to which the first coil in the embodiment is attached. As shown in FIG. 7 and FIG. 8, in the embodiment, the first coil 40 is disposed close to the end face 18 on one circumferential side of the first magnetic pole portion 16 and the end face 17 on the other circumferential side of the other first magnetic pole portion 16 adjacent to the other circumferential side of the first magnetic pole portion 16. For example, as shown in FIG. 7, the first coil 41 is disposed close to the end face 18a of the first magnetic pole portion 16a and the end face 17b of the other adjacent first magnetic pole portion 16b.

[0028] In the embodiment, the second coil 50 is also disposed close to the end face 18 on one circumferential side of the first magnetic pole portion 16 and the end face 17 on the other circumferential side of another first magnetic pole portion 16 adjacent to the other circumferential side of the first magnetic pole portion. FIG. 9 is a perspective view showing an example of the attachment of the second coil to the first stator in the embodiment. FIG. 10 is a perspective view showing an example of the first stator to which the second coil is attached in the embodiment. For example, as shown in FIG. 13, the second coil 51 is close to the end face 18b of the first magnetic pole portion 16b and the end face 17c of the other adjacent first magnetic pole portion 16c.

[0029] 9 and 10, one of the two circumferential end faces 17 and 18 of the first magnetic pole portion 16 is adjacent to the first coil 40, and the other is adjacent to the second coil 50. For example, as shown in Fig. 7 and 9, the second coil 51 is adjacent to one end face 18b of the first magnetic pole portion 16b, and the first coil 41 is adjacent to the other end face 17b of the first magnetic pole portion 16b.

[0030] As shown in FIG. 10, the first stator 10 is further equipped with a retainer that prevents the first coil 40 and the second coil 50, which are bobbin coils, from falling off. FIG. 11 is an exploded perspective view showing an example of the first stator and the retainer in the embodiment. As shown in FIG. 11, the retainer 61 is attached to the first stator 10 from the negative side in the axial direction. Similarly, the retainer 62 is attached to the first stator 10 from the positive side in the axial direction. As shown in FIG. 11, in the embodiment, the retainer 62 has approximately the same shape as the retainer 61.

[0031] The second stator 20 is further attached to the first stator 10 to which the retainers 61 and 62 are attached. Fig. 12 is an enlarged cross-sectional view showing an example of the attachment of the second stator to the first stator in the embodiment. Fig. 13 is a cross-sectional view showing an example of a stator in the embodiment. Fig. 12 shows a cross-section taken along line BB in Fig. 3. Fig. 13 shows a cross-section taken along line AA in Fig. 2.

[0032] In the embodiment, the second stator 20 includes a second yoke portion 23 and a second magnetic pole portion 26. The second yoke portion 23 is a member formed by, for example, stacking electromagnetic steel sheets in the axial direction. The second yoke portion 23 includes two protruding portions 24 and 25 that protrude from both sides in the circumferential direction. The second magnetic pole portion 26 may include an insulating film (not shown) that covers the side surface, an insulating coating, or the like. The insulating film is, for example, a heat-shrinkable film having insulating properties.

[0033] The second magnetic pole portion 26 is a protruding portion that is formed integrally with the second yoke portion 23 and extends radially inward from the inner circumferential surface side of the second yoke portion 23. As shown in Fig. 3 and Fig. 12, the second magnetic pole portion 26 in the embodiment also has a shape that does not include an end portion that protrudes in the circumferential direction, for example, on the tip side (radially inward).

[0034] In the embodiment, the second stator 20 is disposed by press-fitting the second magnetic pole portion 26 from the outside in the radial direction into a gap portion G formed between two adjacent first magnetic pole portions 16. For example, the second stator 20a shown in Fig. 12 is disposed in a gap portion Gab between the first magnetic pole portion 16a and the first magnetic pole portion 16b adjacent to the first magnetic pole portion 16a in the circumferential direction.

[0035] In the embodiment, a part of the gap G in which the second stator 20 is disposed is located between two adjacent first coils 40. For example, the second magnetic pole portion 26b of the second stator 20b shown in Fig. 12 and Fig. 13 is disposed in the gap Gbc located between the first coil 41 and another first coil 42 adjacent to the first coil 41 in the circumferential direction.

[0036] In the embodiment, another part of the gap G in which the second stator 20 is disposed is located between two adjacent second coils 50. For example, the second magnetic pole portion 26a of the second stator 20a shown in Fig. 12 and Fig. 13 is disposed in the gap Gab located between the second coil 56 and another second coil 51 adjacent to the second coil 56 in the circumferential direction.

[0037] As described above, the motor 1 in the embodiment includes the shaft 99, the rotor 90, the first stator 10, and the second stator 20. The first stator 10 has a plurality of first yoke portions 13, a plurality of first magnetic pole portions 16, connecting portions 11, 12 that connect the plurality of first yoke portions 13 in the circumferential direction, and a gap portion G formed between the plurality of first magnetic pole portions 16 adjacent in the circumferential direction. The second stator 20 has a second yoke portion 23 and a second magnetic pole portion 26. The second stator 20 is disposed in the gap portion G. With this configuration, a distributed winding coil can be easily formed.

[0038] Moreover, since the multiple first yoke portions 13 in the embodiment are connected to the annular connecting portions 11 and 12, it is possible to suppress positional deviation of each of the first yoke portions 13. This makes it possible to reduce the circularity of the tip of the first magnetic pole portion 16 that protrudes inward in the radial direction of the stator 2.

[0039] In the embodiment, two adjacent second stators 20 press-fitted into the gap G serve to prevent the first magnetic pole portion 16 sandwiched between the two second stators 20 from coming off. For example, the first magnetic pole portion 16a shown in Fig. 13 presses against the second magnetic pole portion 26l press-fitted into the adjacent gap Gla. Similarly, the first magnetic pole portion 16a presses against the other second magnetic pole portion 26a press-fitted into the adjacent gap Gab.

[0040] In such a configuration, for example, when a force acts on the first magnetic pole portion 16a of the first stator 10 in the direction indicated by the arrow, the first magnetic pole portion 16a and the adjacent second stators 20l and 20a try to deform as shown in FIG. 14. FIG. 14 is an enlarged cross-sectional view showing an example of the relationship between the first stator and the second stator in the embodiment. In this case, the two second stators 20l and the second stator 20a adjacent to the first magnetic pole portion 16a each suppress the first magnetic pole portion 16a from slipping out in the direction indicated by the arrow. In this way, in the configuration in the embodiment, it is possible to suppress the first magnetic pole portion 16 from falling off. And, since the second stators 20a and 20l are arranged in a motor frame (not shown), the first stator 10 and the second stator 20 can be held more firmly.

[0041] Although the configurations in each embodiment have been described above, the embodiments are not limited thereto. For example, the configuration in which two layers of coils, the first coil 40 and the second coil 50, are arranged in the first stator 10 as shown in FIG. 15 have been described, but as shown in FIG. 16, a configuration in which three or more layers of coils are arranged may be used. FIG. 15 is a schematic diagram showing an example of the arrangement of coils in the embodiment. FIG. 16 is a schematic diagram showing an example of the arrangement of coils in the first modified example. In the following embodiments and modified examples, the same parts as those shown in the drawings described above are given the same reference numerals, and duplicated explanations are omitted. Also, insulators 31 and 32 and other members are not shown in FIG. 15 and FIG. 16.

[0042] As shown in FIG. 16, in the first modified example, the first stator 10A first has four first coils 7a to 7d arranged therein, followed by four second coils 8a to 8d and four third coils 9a to 9d arranged in sequence.

[0043] In the embodiment and the first modified example, the configuration in which each coil is arranged across two mutually adjacent first magnetic pole parts has been described, but the embodiment is not limited to this. For example, the coil may be arranged across two mutually non-adjacent first magnetic pole parts 16, or may be arranged on each individual first magnetic pole part 16. In this way, the position of the first magnetic pole part 16 on which the coil is arranged may be adjusted from the viewpoint of the workability of the coil arrangement, the balance of the center of gravity of the stator, and the like. Even in this case, the second stator 20 is attached after the coil arrangement, so that the workability during the coil arrangement can be improved.

[0044] Although an example in which the first coil 40 and the second coil 50 of bobbin coil type are arranged has been described, the embodiment is not limited to this. For example, the first coil 40 and the second coil 50 may be arranged by being wound around a nozzle or the like. Also, the first magnetic pole portion 16 may be shaped to have two ends protruding in the circumferential direction, for example, on the tip side (inner side in the radial direction). Note that a shape having two ends protruding in the circumferential direction is advantageous when inserting members such as insulating members and sensors.

[0045] Also, for example, in cases where there is no risk of the first magnetic pole portion 16 falling off, the second magnetic pole portion 26 may be disposed in the gap portion G by a method other than press-fitting. Also, only one of the connecting portions 11 and 12 may be provided, and the connecting portions 11 and 12 may be provided at a location other than both ends in the axial direction.

[0046] Furthermore, when there is no risk of the first coil 40 and the second coil 50 falling off, for example when the first coil 40 and the second coil 50 are bonded to the insulators 31 and 32, a configuration may be used that does not include the stoppers 61 and 62. Moreover, instead of the insulators 31 and 32, a configuration may be used in which an insulating member is provided by a process of providing an insulating layer such as an insulating coating.

[0047] In addition, although the configuration in which the bobbin coils are arranged in multiple layers has been described, the embodiment is not limited thereto. For example, as shown in Fig. 17, instead of the configuration in which the first coil 40 and the second coil 50 are arranged in multiple layers, a configuration in which conductors such as bobbin coils and conductor segments are arranged in a line may be used. Fig. 17 is a perspective view showing an example of a stator in the second modified example. As shown in Fig. 17, a first stator 10B in the second modified example has a plurality of first coils 40B arranged in a line.

[0048] In the second modified example, the first stator 10B includes the connecting portions 11B and 12B and the first yoke portion 13B. The first coil 40B is disposed on the inner circumferential side of the first stator 10B, as described later. The first stator 10B on which the plurality of first coils 40B are disposed is further fitted with the second stator B20, as shown in FIG. 18. FIG. 18 is a perspective view showing an example of the attachment of the second stator in the second modified example. As shown in FIG. 18, the yoke portion 13B of the first stator 10B in the second modified example does not have a magnetic pole portion protruding radially inward. The first yoke portion 13B is provided at both axial ends with connecting portions 11B and 12B, which connect the first yoke portions 13B in the circumferential direction. The first yoke portions 13B adjacent to each other in the circumferential direction face each other across the gap portion GB. In addition, connecting portion 11B is provided in the axial direction as a separate member, and connecting portion 12B is provided on the other axial side integral with first yoke portion 13B, but this is not limited to the above, and connecting portions made of separate members may be provided on both axial sides, or connecting portions may be provided on both axial sides integral with the first stator.

[0049] Fig. 19 is a top view of the first coil in the second modified example. As shown in Fig. 19, the first coil 40B in the second modified example is, for example, a bobbin coil formed into a hexagonal shape. The first coil 40B is not limited to a bobbin coil formed in advance, and may be an electric conductor such as an unformed segment conductor, which may be mechanically processed, such as bent, after being arranged. The first coil 40B is an example of a conductor.

[0050] As shown in FIG. 19, the first coil 40B is formed in a shape having a pair of oblique sides extending to one axial side, a pair of oblique sides extending to the other axial side, and a pair of sides extending in the axial direction, in other words, a hexagonal shape having a first apex 41B convex on one axial side and a second apex 42B convex on the other axial side.

[0051] As shown in Fig. 19, each first coil has, for example, two connection parts 43B and 44B protruding in the axial direction. The connection parts of other first coils 40B arranged adjacently are connected to each other by, for example, welding. Note that, other than welding, electrical connection by ultrasonic welding or mechanical connection by crimping or the like may be performed.

[0052] Also, the first coil 40B has a shape having a step I1 in the radial direction. For example, the first apex 41B and the second apex 42B are inclined such that the position in the radial direction changes from the connection portion 44B toward the connection portion 43B. In this case, as shown in FIG. 20 and FIG. 21, the oblique side 48Ba, which is one of a pair of oblique sides extending to one side in the axial direction of the first coil 40Bb to be arranged later, is arranged on the other axial side of the oblique side 48Ba, which is one of a pair of oblique sides extending to one side in the axial direction of the first coil 40Ba arranged earlier. FIG. 20 is a perspective view showing an example of the first coil arranged in the first stator in the second modified example. FIG. 21 is a side view showing an example of the first coil arranged in the first stator in the second modified example. Note that FIG. 21 is an enlarged view of the portion indicated by the frame F1 in FIG. 18.

[0053] Furthermore, the other of the pair of oblique sides 49Bb of the first coil 40Bb to be inserted later is disposed on one axial side of the other of the pair of oblique sides 49Ba of the first coil 40Ba inserted earlier. Note that, at this time, the oblique sides 48Ba and 48Bb of the pair of oblique sides extending on one axial side are disposed radially inward of the other of the pair of oblique sides 49Ba and 49Bb of the first coil 40B adjacent to the first coil 40Ba in the circumferential direction. As shown in FIG. 21, the oblique side 48Ba of the first coil 40Ba and the oblique side 49Ba of the first coil 40B adjacent to the first coil 40Ba in the circumferential direction face each other with an interval I1 therebetween in the radial direction.

[0054] As shown in Fig. 21, the first coils 40B are arranged on the inner circumferential side of the first stator 10B such that the first tops 41B face the gaps GB in the radial direction. In this case, the second stators B20 are inserted and arranged between the gaps GB from the radially outer side by press-fitting or the like as shown in Fig. 18. When inserting the second stator B20, for example, the connection parts 43B and 44B of the first coils 40B arranged on the first stator 10B are held by a machine, so that the position of the first coils 40B is fixed so as to correspond to the gaps GB in the circumferential direction as shown in Fig. 21.

[0055] The second stator B20 press-fitted into the gap GB is adjacent to the first coil 40B in the circumferential direction, as shown in Fig. 17 and Fig. 18. In addition, the first stator 10B into which the second stators B20 are press-fitted may further have stoppers 61B and 62B arranged on both sides in the axial direction to prevent the first coil 40B from falling off in the radial direction, as shown in Fig. 22. Fig. 22 is an exploded perspective view showing an example of the first stator and the stopper in the second modified example. The second stator B20 includes an insulating film (not shown) covering the side surface. The insulating film is, for example, a heat-shrinkable film having insulating properties.

[0056] In this way, by using conductors such as conductor segments, the space factor of the motor 1 can be improved, and by placing the second stator in the gap of the first stator, the manufacture of the motor 1 can be made easier and the inner diameter roundness can be improved.

[0057] In addition, the motor in each embodiment is, for example, an inner rotor type brushless motor, but is not limited thereto, and the first stator and the second stator in the embodiment or the modified example may be used in an outer rotor type motor. Furthermore, the first stator and the second stator may be used in a rotating electric machine other than a motor, such as a generator.

[0058] Although the present invention has been described above based on the embodiment and each modification, it goes without saying that the present invention is not limited to the embodiment and each modification, and various modifications are possible within the scope of the gist of the present invention. Such modifications that do not depart from the scope of the gist are also included in the technical scope of the present invention, and this will be clear to those skilled in the art from the description of the claims. [Explanation of symbols]

[0059] REFERENCE SIGNS LIST 1 motor, 2 stator, 10, 10A, 10B first stator, 11, 12 connection portion, 13 (13a to 13l) first yoke portion, 16 (16a to 16l) first magnetic pole portion (teeth), 31, 32 insulator, 20 second stator, 23 second yoke portion, 26 (26a to 26l) second magnetic pole portion (teeth), 40 (41 to 46), 7a to 7d first coil, 50 (51 to 56), 8a to 8d second coil, 9a to 9d third coil

Claims

1. A shaft, a rotor, a first stator, and a second stator, the first stator has a plurality of first yoke portions, a plurality of first magnetic pole portions, a connecting portion that connects the plurality of first yoke portions in a circumferential direction, a gap portion formed between the plurality of first magnetic pole portions adjacent in the circumferential direction, an insulating member, and a first coil that is arranged on the plurality of first magnetic pole portions via the insulating member, the second stator has a second yoke portion and a second magnetic pole portion, the second stator is disposed in the gap, The first coil is disposed across an end face on one circumferential side of the first magnetic pole portion and an end face on the other circumferential side of another first magnetic pole portion adjacent to the other circumferential side of the first magnetic pole portion. Motor.

2. The motor according to claim 1 , wherein the connecting portions are respectively disposed on both axial ends of the plurality of first yoke portions.

3. The first yoke portions each have a recess that is recessed in a circumferential direction, The second yoke portion has a protruding portion protruding in a circumferential direction, The motor according to claim 1 or 2, wherein the recess and the protrusion are engaged with each other.

4. a second coil disposed on the first magnetic pole portions via the insulating member; The motor according to claim 1 , wherein the second coil is disposed on an end face of the first magnetic pole portion opposite in a circumferential direction to an end face on which the first coil is disposed.

5. The motor according to claim 4 , wherein any one of the second magnetic pole portions is disposed in a gap between the second coil and another second coil adjacent to the second coil in the circumferential direction.

6. The motor according to claim 3 , wherein at least one of the second magnetic pole portions is disposed in a gap between the first coil and another first coil adjacent to the first coil in the circumferential direction.

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