Stator and motor

Abstract

A stator 20A comprises: a stator core 30A having an annular yoke 31 along the circumferential direction, and teeth 32 projecting from an inner peripheral surface 31d of the yoke 31 in the radial direction of the yoke 31, the stator core 30A being composed of a molded body of magnetic powder; a coil 40A composed of windings 41 wound around the teeth 32; and a terminal member 50A having a pillar portion 51 extending in the axial direction of the stator core 30A, a first fixing portion 52 provided at one end of the pillar portion 51 in the axial direction so as to project toward the inner peripheral surface 31d of the yoke 31 beyond the pillar portion 51 in the radial direction, a second fixing portion 53 provided at the other end of the pillar portion 51 in the axial direction so as to project toward the inner peripheral surface 31d of the yoke 31 beyond the pillar portion 51 in the radial direction, and a terminal portion 54 provided on the first fixing portion 52 so as to project from the first fixing portion 52. The yoke 31 has a first end surface 31a and a second end surface 31b opposite each other in the axial direction. The terminal member 50A clamps the yoke 31 in the axial direction such that the pillar portion 51 faces an outer peripheral surface 31c of the yoke 31 in the radial direction, the first fixing portion 52 faces the first end surface 31a of the yoke 31, and the second fixing portion 53 faces the second end surface 31b of the yoke 31. One end 41a of each winding 41 is fixed in a state of being wound around the terminal portion 54.

Description

Stator and motor

[0001] The present invention relates to a stator and a motor.

[0002] Patent Document 1 discloses an electric motor that includes a rotor having a plurality of magnetic poles spaced apart in the circumferential direction, and a stator surrounding the rotor, the stator including an annular stator core formed by molding magnetic powder, the stator core having an annular yoke and a plurality of teeth that protrude from the inner circumference of the yoke and are spaced apart from each other by slots in the circumferential direction of the yoke, and grooves for winding coils are provided at both axial ends of the stator core corresponding to each tooth.

[0003] Japanese Patent Application Laid-Open No. 2008-61408

[0004] The electric motor described in Patent Document 1 uses a bus bar to electrically connect the coils. As shown in FIG. 4 of Patent Document 1, the bus bar, to which the coils are connected, is fixed to the stator core with screws. However, in the electric motor described in Patent Document 1, fixing the bus bar to the stator core with screws requires additional processing to form threaded holes in the stator core after fabricating the stator core, which reduces the efficiency of the process of fixing the bus bar to the stator core. Furthermore, in the electric motor described in Patent Document 1, the stator core is damaged when the threaded holes are formed, which reduces the strength of the stator core and ultimately reduces the fixing strength of the bus bar to the stator core. Thus, the electric motor described in Patent Document 1 leaves room for improvement in terms of the efficiency of installation of the bus bar for electrically connecting the coils and the fixing strength after installation.

[0005] The present invention has been made to solve the above problems, and aims to provide a stator that can improve the work efficiency during installation of terminal members for electrically leading out the coils and the fixing strength after installation. Another aim of the present invention is to provide a motor having the above stator.

[0006] The stator of the present invention has an annular yoke extending along a circumferential direction, and teeth protruding from an inner peripheral surface of the yoke in a radial direction of the yoke, and comprises a stator core made of a compact of magnetic powder, coils made of windings wound around the teeth, pillar portions extending in the axial direction of the stator core, a first fixing portion provided at one end of the pillar portions in the axial direction so as to protrude further toward the inner peripheral surface of the yoke in the radial direction than the pillar portions, and another fixing portion provided at another end of the pillar portions in the axial direction so as to protrude further toward the inner peripheral surface of the yoke in the radial direction than the pillar portions. and a terminal member having a second fixed portion provided at one end thereof and a terminal portion provided on the first fixed portion so as to protrude from the first fixed portion, wherein the yoke has a first end face and a second end face that face each other in the axial direction, the terminal member sandwiches the yoke in the axial direction so that the pillar portion faces the outer peripheral surface of the yoke in the radial direction, the first fixed portion faces the first end face of the yoke, and the second fixed portion faces the second end face of the yoke, and one end of the winding is fixed in a state where it is wound around the terminal portion.

[0007] A motor according to the present invention is characterized by comprising the stator according to the present invention and a rotor provided opposite to the inner peripheral surface of the stator.

[0008] According to the present invention, it is possible to provide a stator that can improve the work efficiency during installation of terminal members for electrically leading out coils and the fixing strength after installation. Also, according to the present invention, it is possible to provide a motor having the above stator.

[0009] FIG. 1 is a schematic perspective view showing an example of a stator according to a first embodiment of the present invention. FIG. 2 is a schematic perspective view showing the coil unit in FIG. 1 as viewed from the inside. FIG. 3 is a schematic perspective view showing the coil unit in FIG. 1 as viewed from the outside. FIG. 4 is a schematic perspective view showing the split cores in FIGS. 2 and 3. FIG. 5 is a schematic perspective view showing the terminal members in FIGS. 2 and 3. FIG. 6 is a schematic cross-sectional view showing a portion of the cross section of the terminal member taken along line A-A' in FIG. 5. FIG. 7 is a schematic perspective view showing a state in which a housing is attached to the stator shown in FIG. 1. FIG. 8 is a schematic perspective view showing an example of a coil unit constituting a stator according to a second embodiment of the present invention. FIG. 9 is a schematic perspective view showing the split cores in FIG. 8. FIG. 10 is a schematic perspective view showing the terminal members in FIG. 8. FIG. 11 is a schematic perspective view showing an example of a coil unit constituting a stator according to a third embodiment of the present invention. FIG. 12 is a schematic perspective view showing the split cores in FIG. 11. FIG. 13 is a schematic perspective view showing a terminal member in FIG. 11 . FIG. 14 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 4 of the present invention. FIG. 15 is a schematic perspective view showing a split core in FIG. 14 . FIG. 16 is a schematic perspective view showing a terminal member in FIG. 14 . FIG. 17 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 5 of the present invention. FIG. 18 is a schematic perspective view showing a split core in FIG. 17 . FIG. 19 is a schematic perspective view showing a terminal member in FIG. 17 . FIG. 20 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 6 of the present invention. FIG. 21 is a schematic perspective view showing a split core in FIG. 20 . FIG. 22 is a schematic perspective view showing a terminal member in FIG. 20 . FIG. 23 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 7 of the present invention. FIG. 24 is a schematic perspective view showing a split core in FIG. 23 . Fig. 25 is a schematic perspective view showing a terminal member in Fig. 23. Fig. 26 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 8 of the present invention. Fig. 27 is a schematic perspective view showing a divided core in Fig. 26. Fig. 28 is a schematic perspective view showing a terminal member in Fig. 26. Fig. 29 is a schematic perspective view showing an example of a stator according to embodiment 9 of the present invention. Fig. 30 is a schematic perspective view showing an example of a motor according to the present invention.

[0010] The stator and motor of the present invention will be described below. Note that the present invention is not limited to the following configurations and may be modified as appropriate without departing from the spirit of the present invention. Furthermore, a combination of multiple individual preferred configurations described below also constitutes the present invention.

[0011] The following embodiments are merely examples, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. From embodiment 2 onwards, descriptions of matters common to embodiment 1 will be omitted, and differences will be mainly described. In particular, similar effects resulting from similar configurations will not be mentioned one after the other for each embodiment.

[0012] In the following description, when there is no need to particularly distinguish between the embodiments, they will simply be referred to as "the stator of the present invention" and "the motor of the present invention."

[0013] The drawings shown below are schematic diagrams, and the dimensions, aspect ratio, scale, etc. may differ from those of the actual product.

[0014] In this specification, terms indicating the relationship between elements (e.g., "parallel," "orthogonal," etc.) and terms indicating the shape of elements not only mean the literal strict form, but also mean a range that is substantially equivalent, for example, a range that includes a difference of about a few percent.

[0015] [Stator] A stator of the present invention includes a stator core having an annular yoke extending along a circumferential direction and teeth protruding from an inner peripheral surface of the yoke in a radial direction of the yoke, the stator core being made of a compact of magnetic powder, coils made of windings wound around the teeth, pillar portions extending in an axial direction of the stator core, a first fixing portion provided at one end of the pillar portions in the axial direction so as to protrude further toward the inner peripheral surface of the yoke in the radial direction than the pillar portions, and another fixing portion provided at another end of the pillar portions in the axial direction so as to protrude further toward the inner peripheral surface of the yoke in the radial direction than the pillar portions. and a terminal member having a second fixed portion provided at one end thereof and a terminal portion provided on the first fixed portion so as to protrude from the first fixed portion, wherein the yoke has a first end face and a second end face that face each other in the axial direction, the terminal member sandwiches the yoke in the axial direction so that the pillar portion faces the outer peripheral surface of the yoke in the radial direction, the first fixed portion faces the first end face of the yoke, and the second fixed portion faces the second end face of the yoke, and one end of the winding is fixed in a state where it is wound around the terminal portion.

[0016] In a stator according to a first embodiment of the present invention, a first end surface of the yoke is fitted to a first fixed portion. More specifically, in the stator according to the first embodiment of the present invention, a first groove is provided in the first end surface of the yoke so as to open toward the outer peripheral surface of the yoke in the radial direction, and the first groove is fitted to the first fixed portion.

[0017] In the stator of the first embodiment of the present invention, the second end surface of the yoke and the second fixed portion are fitted together. More specifically, in the stator of the first embodiment of the present invention, the second end surface of the yoke is provided with a second groove that opens radially toward the outer peripheral surface of the yoke, and the second groove and the second fixed portion are fitted together.

[0018] FIG. 1 is a perspective schematic view showing an example of a stator according to a first embodiment of the present invention.

[0019] The stator 20A shown in FIG. 1 includes a stator core 30A, a plurality of coils 40A, and a plurality of terminal members 50A.

[0020] The stator core 30A has a yoke (also called a core back) 31 and a plurality of teeth 32 .

[0021] In this specification, the direction in which the axis of the stator core extends is defined as the axial direction. The direction along the outer peripheral surface of the yoke as viewed from the axial direction is defined as the circumferential direction. Furthermore, the direction perpendicular to the axial direction and in which the outer peripheral surface and inner peripheral surface of the yoke face each other is defined as the radial direction.

[0022] The yoke 31 is annular and extends in the circumferential direction.

[0023] The yoke 31 has a first end surface 31a and a second end surface 31b that face each other in the axial direction.

[0024] The yoke 31 has an outer peripheral surface 31c and an inner peripheral surface 31d that face each other in the radial direction.

[0025] The teeth 32 are spaced apart from one another in the circumferential direction and independently protrude from an inner peripheral surface 31d of the yoke 31 in the radial direction of the yoke 31. In this manner, the teeth 32 are integrated with the yoke 31.

[0026] In this specification, two elements being integrated means that there is no interface between the elements, for example, it means that the boundary between the elements cannot be discerned.

[0027] The stator core 30A is made of a compact of magnetic powder, that is, the yoke 31 and the teeth 32 are integrally formed from a compact of magnetic powder.

[0028] The stator core 30A is preferably made of a powder magnetic core, that is, the yoke 31 and the teeth 32 are preferably integrally made of a powder magnetic core.

[0029] The stator core 30A may be configured not only as a powder magnetic core but also as a compact of a composite material containing magnetic powder and resin.

[0030] Each of the plurality of coils 40A is formed by a winding 41 wound around a tooth 32. The plurality of coils 40A are independently provided on the tooth 32 so as to be spaced apart from each other in the circumferential direction.

[0031] Each of the multiple coils 40A is insulated from the teeth 32 via, for example, an insulating member to be described later.

[0032] The windings 41 of the multiple coils 40A are connected in series, for example.

[0033] The winding wire 41 may be, for example, polyurethane copper wire (UEW).

[0034] Each of the plurality of terminal members 50A has a pillar portion 51, a first fixing portion 52, a second fixing portion 53, and a terminal portion 54.

[0035] The pillar portion 51 extends in the axial direction.

[0036] The first fixing portion 52 is provided at one end of the pillar portion 51 in the axial direction (in Figure 1, the upper end of the pillar portion 51) so as to protrude radially toward the inner surface 31d of the yoke 31 more than the pillar portion 51.

[0037] The first fixing portion 52 may protrude from the column portion 51 in the circumferential direction as shown in FIG. 1 , or may not protrude from the column portion 51 .

[0038] The first fixing portion 52 may be integral with the pillar portion 51. In this case, the first fixing portion 52 is, for example, integrally molded with the pillar portion 51.

[0039] The first fixing portion 52 does not have to be integrated with the pillar portion 51. In this case, the first fixing portion 52 is, for example, a separate member from the pillar portion 51 and is fixed to the pillar portion 51 by a method such as joining.

[0040] From the viewpoint of manufacturing efficiency of the terminal member 50A, it is preferable that the first fixing portion 52 is integrated with the pillar portion 51 .

[0041] The second fixing portion 53 is provided at the other end of the pillar portion 51 in the axial direction (in Figure 1, the lower end of the pillar portion 51) so as to protrude radially toward the inner surface 31d of the yoke 31 more than the pillar portion 51.

[0042] The second fixing portion 53 may protrude from the column portion 51 in the circumferential direction as shown in FIG. 1 , or may not protrude from the column portion 51 .

[0043] The second fixing portion 53 may be integral with the pillar portion 51. In this case, the second fixing portion 53 is, for example, integrally molded with the pillar portion 51.

[0044] The second fixing portion 53 does not have to be integrated with the pillar portion 51. In this case, the second fixing portion 53 is, for example, a separate member from the pillar portion 51 and is fixed to the pillar portion 51 by a method such as joining.

[0045] From the viewpoint of manufacturing efficiency of the terminal member 50A, it is preferable that the second fixing portion 53 is integrated with the pillar portion 51 .

[0046] It is preferable that the pillar portion 51, the first fixing portion 52, and the second fixing portion 53 are each independently made of an insulating material.

[0047] Examples of insulating materials that form the column portion 51, the first fixing portion 52, and the second fixing portion 53 include resins such as nylon and polyphenylene sulfide (PPS).

[0048] The constituent materials of the pillar portion 51, the first fixing portion 52, and the second fixing portion 53 may be the same as or different from one another, or may be partially different from one another.

[0049] In the example shown in FIG. 1, the terminal member 50A has one terminal portion 54.

[0050] The terminal portion 54 is provided on the first fixed portion 52 so as to protrude from the first fixed portion 52 .

[0051] The terminal portion 54 preferably protrudes from the first fixed portion 52 toward the opposite side to the second fixed portion 53 in the axial direction.

[0052] The terminal portion 54 may be integral with the first fixed portion 52. In this case, the terminal portion 54 is, for example, integrally molded with the first fixed portion 52.

[0053] The terminal portion 54 does not have to be integrated with the first fixed portion 52. In this case, the terminal portion 54 is, for example, a separate member from the first fixed portion 52 and is fixed to the first fixed portion 52 by a method such as press-fitting.

[0054] The terminal portion 54 is preferably made of a conductive material, so that one end 41a of the winding 41, which will be described later, can be easily connected to a terminal of a wiring board via the terminal portion 54.

[0055] Examples of conductive materials that form the terminal portions 54 include metals such as phosphor bronze.

[0056] The terminal portion 54 may be made of an insulating material. In this case, there is no need to consider insulation between the terminal portion 54 and the stator core 30A, which increases the degree of freedom in arranging the terminal portion 54 relative to the first fixed portion 52.

[0057] Examples of insulating materials that can be used to form the terminal portions 54 include resins such as nylon and polyphenylene sulfide.

[0058] The three-dimensional shape of the terminal portion 54 may be, for example, a prismatic shape, a cylindrical shape, or the like.

[0059] The terminal member 50A clamps the yoke 31 in the axial direction so that the pillar portion 51 faces the outer peripheral surface 31c of the yoke 31, the first fixing portion 52 faces the first end face 31a of the yoke 31, and the second fixing portion 53 faces the second end face 31b of the yoke 31.

[0060] In the stator 20A, the terminal member 50A has a structure in which the yoke 31 is clamped in the axial direction, so that the terminal member 50A can be easily attached to the yoke 31 without additional processing such as forming a screw hole in the yoke 31 as in Patent Document 1, for example, thereby improving work efficiency when attaching the terminal member 50A.

[0061] Furthermore, in the stator 20A, the terminal members 50A are attached so as to sandwich the yoke 31 in the axial direction, which improves the fixing strength of the terminal members 50A after attachment. In the stator 20A, the fixing strength of the terminal members 50A after attachment is improved, which also improves reliability.

[0062] An insulating member may be provided between the yoke 31 and the terminal member 50A. In this case, insulation between the yoke 31 and the terminal member 50A, particularly insulation between the yoke 31 and the terminal portion 54, is more easily ensured.

[0063] The insulating member may be an insulating film that covers at least one of the yoke 31 and the terminal member 50A.

[0064] When the yoke 31 is coated with an insulating film, it is preferable that the surface of the yoke 31 facing the terminal member 50A is coated with the insulating film, and it is more preferable that the entire surface of the yoke 31 is coated with the insulating film.

[0065] In addition, when the surface of the yoke 31 facing the terminal member 50A is covered with an insulating film, the entire surface of the yoke 31 does not have to be covered with an insulating film.

[0066] When the terminal member 50A is coated with an insulating film, it is preferable that the surfaces of the pillar portion 51, the first fixing portion 52, and the second fixing portion 53 that face the yoke 31 are coated with an insulating film, and it is more preferable that the entire surfaces of the pillar portion 51, the first fixing portion 52, and the second fixing portion 53 are coated with an insulating film.

[0067] In addition, when the surfaces of the pillar portion 51, the first fixed portion 52, and the second fixed portion 53 facing the yoke 31 are covered with an insulating film, the entire surfaces of the pillar portion 51, the first fixed portion 52, and the second fixed portion 53 do not have to be covered with an insulating film.

[0068] As a method for covering the target surface of at least one of the yoke 31 and the terminal member 50A with an insulating film, for example, a method of applying an insulating material to the target surface by a coating method such as electrodeposition coating can be mentioned.

[0069] The insulating member may be an insulating sheet preformed from an insulating material, and in this case, the insulating sheet is provided at least between the yoke 31 and the terminal member 50A.

[0070] As described above, when the pillar portion 51, the first fixed portion 52, and the second fixed portion 53 are made of an insulating material, an insulating member does not need to be provided between the yoke 31 and the terminal member 50A. However, for example, when the terminal portion 54 is exposed from the surface of the first fixed portion 52 facing the yoke 31, it is preferable that an insulating member be provided between the yoke 31 and the exposed portion of the terminal portion 54.

[0071] One end 41a of the winding 41 is fixed in a state where it is wound around the terminal portion 54. As a result, one end 41a of the winding 41 is led out to the terminal member 50A.

[0072] One end 41 a of winding 41 may be wound around terminal 54 and then fixed to terminal 54 by soldering or the like. Alternatively, one end 41 a of winding 41 may be wound around terminal 54 and then fixed to terminal 54 and a terminal of a wiring board (described later) by soldering or the like.

[0073] In the stator 20A, it is sufficient that at least one of the multiple coils 40A has one end 41 a of the winding 41 fixed in a state where it is wound around the terminal portion 54. In other words, of the multiple coils 40A, one end 41 a of the winding 41 of all the coils 40A may be fixed in a state where it is wound around the terminal portion 54, or one end 41 a of the winding 41 of some of the coils 40A may be fixed in a state where it is wound around the terminal portion 54. When one end 41 a of the winding 41 of some of the multiple coils 40A is fixed in a state where it is wound around the terminal portion 54, one end 41 a of the winding 41 of the remaining coils 40A does not have to be fixed in a state where it is wound around the terminal portion 54.

[0074] As described above, in the stator 20A, by utilizing the terminal member 50A that clamps the yoke 31 in the axial direction, electrical derivation of the coil 40A is realized, for example, electrical derivation of the coil 40A for electrical connection to the wiring board described later.

[0075] As described above, the stator 20A can improve the work efficiency when attaching the terminal members 50A for electrically leading out the coils 40A and the fixing strength after attachment.

[0076] During the manufacture of the stator 20A, there is no need to perform additional processing on the formed stator core 30A (more specifically, the yoke 31) in order to attach the terminal member 50A to the yoke 31. Therefore, during the manufacture of the stator 20A, no damage is inflicted on the stator core 30A, and as a result, a decrease in the strength of the stator 20A (more specifically, the stator core 30A) is suppressed.

[0077] Furthermore, in the stator 20A, the terminal members 50A are attached so as to sandwich the yoke 31 in the axial direction, so that the space factor of the coil 40A (winding 41) is not reduced by the terminal members 50A, thereby ensuring the output density of the motor incorporating the stator 20A.

[0078] In the following, a stator having a plurality of coil units arranged in a ring shape in the circumferential direction will be taken as an example of the stator of the first embodiment of the present invention, and the manner in which the terminal members are fixed to each coil unit will be described.

[0079] As shown in FIG. 1, the stator 20A is formed by arranging a plurality of coil units, including a coil unit 70A and a coil unit 71A, in an annular shape in the circumferential direction.

[0080] In the stator 20A, the coil unit 70A is used, for example, when connecting the windings 41 of the multiple coils 40A in series. In this case, as shown in Fig. 1, the stator 20A may further include, in addition to the coil unit 70A, a coil unit 71A that is not provided with a terminal member 50A. In this case, since it is not necessary to provide the terminal member 50A to all the coil units, the cost associated with the terminal member 50A can be reduced.

[0081] Fig. 2 is a schematic perspective view showing the coil unit in Fig. 1 as viewed from the inside. Fig. 3 is a schematic perspective view showing the coil unit in Fig. 1 as viewed from the outside. Fig. 4 is a schematic perspective view showing the divided cores in Figs. 2 and 3. Fig. 5 is a schematic perspective view showing the terminal member in Figs. 2 and 3. Fig. 6 is a schematic cross-sectional view showing a part of the cross section along line A-A' of the terminal member in Fig. 5.

[0082] The coil unit 70A shown in FIGS. 2 and 3 includes a split core 80A, a coil 40A, and a terminal member 50A.

[0083] The split cores 80A are formed by dividing the stator core 30A in the circumferential direction. In other words, the stator core 30A is formed by arranging a plurality of split cores 80A in an annular shape in the circumferential direction.

[0084] The split core 80A has a split yoke 81 and teeth 32.

[0085] The split yoke 81 is formed by splitting the yoke 31 in the circumferential direction.

[0086] The split yoke 81 has a first end face 81a and a second end face 81b that face each other in the axial direction. The first end face 81a of the split yoke 81 is included in the first end face 31a of the yoke 31. The second end face 81b of the split yoke 81 is included in the second end face 31b of the yoke 31.

[0087] The split yoke 81 has an outer peripheral surface 81c and an inner peripheral surface 81d that face each other in the radial direction. The outer peripheral surface 81c of the split yoke 81 is included in the outer peripheral surface 31c of the yoke 31. The inner peripheral surface 81d of the split yoke 81 is included in the inner peripheral surface 31d of the yoke 31.

[0088] The teeth 32 protrude in the radial direction from the inner peripheral surface 81d of the split yoke 81. In this manner, the teeth 32 are integrated with the split yoke 81.

[0089] The split core 80A is made of a molded body of magnetic powder. That is, the split yoke 81 and the teeth 32 of the split core 80A are integrally made of a molded body of magnetic powder.

[0090] When viewed from the axial direction, the outer periphery of the split core 80A along the circumferential direction, i.e., the outer periphery of the split yoke 81 along the circumferential direction, may be, for example, composed of only curved lines, only straight lines, or a combination of curved lines and straight lines. The mode in which the split yokes 81 whose outer peripheries when viewed from the axial direction are configured as described above are arranged in the circumferential direction is included in the mode in which the yoke 31 is annular along the circumferential direction.

[0091] In the split core 80A, it is preferable that the teeth 32 are narrower in at least one of the axial and circumferential directions on the split yoke 81 side than on the opposite side of the split yoke 81. In the example shown in Fig. 4, the teeth 32 are narrower in the circumferential direction on the split yoke 81 side than on the opposite side of the split yoke 81.

[0092] Therefore, in a stator core 30A in which multiple split cores 80A are arranged in a ring shape in the circumferential direction, it is preferable that the teeth 32 are thinner on the yoke 31 side than on the opposite side of the yoke 31 in at least one of the axial and circumferential directions.

[0093] If the yoke 31 side of the teeth 32 (the split yoke 81 side) is thinner than the opposite side of the yoke 31 (the opposite side of the split yoke 81), the thinner part can be used as the winding axis of the coil 40A, thereby increasing the number of turns of the coil 40A. As a result, in a motor incorporating the stator 20A, the magnetic flux penetrating the coil 40A tends to increase, which tends to improve the output torque of the motor.

[0094] The coil 40A is provided on the teeth 32 of the split core 80A.

[0095] In the terminal member 50A, the terminal portion 54 may pass through the first fixed portion 52 in the axial direction, or may not pass through the first fixed portion 52 in the axial direction as shown in FIG.

[0096] The terminal member 50A axially sandwiches the split yoke 81 so that the post portion 51 faces the outer peripheral surface 81 c of the split yoke 81, the first fixing portion 52 faces the first end surface 81 a of the split yoke 81, and the second fixing portion 53 faces the second end surface 81 b of the split yoke 81. In this way, the terminal member 50A is fixed to the split yoke 81.

[0097] A specific manner in which the terminal member 50A is fixed to the coil unit 70A will be described below.

[0098] As shown in FIGS. 2, 3, and 4, a first groove 82 is provided in a first end surface 81a of the split yoke 81 so as to open toward an outer peripheral surface 81c of the split yoke 81 in the radial direction.

[0099] The first grooves 82 may be provided so as to open at least toward the outer peripheral surface 81c of the split yoke 81 in the radial direction.

[0100] The first grooves 82 may be provided so as to open in the radial direction across both the outer peripheral surface 81 c side and the inner peripheral surface 81 d side of the split yoke 81. More specifically, the first grooves 82 may be provided so as to connect the outer peripheral surface 81 c and the inner peripheral surface 81 d of the split yoke 81 in the radial direction.

[0101] Alternatively, the first groove 82 may not open to the inner peripheral surface 81d of the split yoke 81 in the radial direction, but may be provided partway from the outer peripheral surface 81c of the split yoke 81 toward the inner peripheral surface 81d.

[0102] The three-dimensional shape of the first groove 82 is not limited to the three-dimensional shape shown in FIG.

[0103] 2 and 3 , the first end surface 81 a of the split yoke 81 is fitted into the first fixed portion 52. More specifically, the first groove 82 provided in the first end surface 81 a of the split yoke 81 is fitted into the first fixed portion 52. This firmly fixes the first fixed portion 52 to the split yoke 81 and makes it easy to position the first fixed portion 52 in the axial and circumferential directions.

[0104] As shown in FIGS. 2, 3, and 4, a second groove 83 is provided in the second end surface 81b of the split yoke 81 so as to open toward the outer peripheral surface 81c of the split yoke 81 in the radial direction.

[0105] The second grooves 83 may be provided so as to open at least toward the outer peripheral surface 81 c of the split yoke 81 in the radial direction.

[0106] The second grooves 83 may be provided so as to open in the radial direction across both the outer peripheral surface 81 c side and the inner peripheral surface 81 d side of the split yoke 81. More specifically, the second grooves 83 may be provided so as to connect the outer peripheral surface 81 c and the inner peripheral surface 81 d of the split yoke 81 in the radial direction.

[0107] Alternatively, the second groove 83 may not open to the inner peripheral surface 81d of the split yoke 81 in the radial direction, but may be provided partway from the outer peripheral surface 81c of the split yoke 81 toward the inner peripheral surface 81d.

[0108] The three-dimensional shape of the second groove 83 is not limited to the three-dimensional shape shown in FIG.

[0109] 2 and 3, the second end surface 81b of the split yoke 81 is fitted into the second fixing portion 53. More specifically, the second groove 83 provided in the second end surface 81b of the split yoke 81 is fitted into the second fixing portion 53. This firmly fixes the second fixing portion 53 to the split yoke 81 and makes it easy to position the second fixing portion 53 in the axial and circumferential directions.

[0110] As described above, in the coil unit 70A, the first groove 82 is engaged with the first fixing portion 52, and the second groove 83 is engaged with the second fixing portion 53, so that the terminal member 50A is firmly fixed to the split yoke 81 and it is easy to position the terminal member 50A in the axial and circumferential directions.

[0111] When the busbars are fixed to the stator core with screws, as in the electric motor described in Patent Document 1, additional processing is required to form threaded holes in the stator core after the stator core is manufactured, which reduces manufacturing efficiency. Furthermore, the stator core is damaged when the threaded holes are formed, which reduces the strength of the stator core. Note that, for example, if the stator core is made of a powder magnetic core, it is difficult to form threaded holes in the stator core because the powder magnetic core is brittle.

[0112] In contrast, in the coil unit 70A, the first groove 82 provided in the first end surface 81a of the split yoke 81 and the second groove 83 provided in the second end surface 81b of the split yoke 81 are formed simultaneously with the molding of the split core 80A. In other words, when manufacturing the coil unit 70A, there is no need to perform additional processing on the molded split core 80A to provide the first groove 82 and the second groove 83 in the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70A.

[0113] Furthermore, when manufacturing the coil unit 70A, there is no need to perform additional processing on the molded split core 80A in order to provide the first groove 82 and the second groove 83 in the split yoke 81, so no damage is caused to the split core 80A, and as a result, the reduction in strength of the coil unit 70A (more specifically, the split core 80A) is suppressed.

[0114] In coil unit 70A, even if the first groove 82 and the second groove 83 provided in split yoke 81 are shallower than, for example, the screw holes described in Patent Document 1, they function when fitting first end surface 81a of split yoke 81 to first fixing portion 52 and when fitting second end surface 81b of split yoke 81 to second fixing portion 53. Therefore, in coil unit 70A, even if split yoke 81 has first groove 82 and second groove 83, the effect on magnetic characteristics is minimized.

[0115] 2 and 3 , the first fixing portion 52 may protrude in the axial direction from the first groove 82. In this case, in the coil unit 70A, the distance between the split yoke 81 and the terminal portion 54 is more easily ensured, and therefore insulation between the split yoke 81 and the terminal portion 54 is more easily ensured.

[0116] FIG. 7 is a schematic perspective view showing a state in which a housing is attached to the stator shown in FIG.

[0117] As shown in Figure 7, when a housing (also called a motor case) 100 for protecting the stator core 30A is attached to the stator 20A, if the first fixing portion 52 protrudes axially from the first groove 82 (see Figures 2, 3, etc.), the distance between the terminal portion 54 and the housing 100 is more easily secured, and therefore insulation between the terminal portion 54 and the housing 100 is more easily secured.

[0118] 2, 3, 5, and 6, the first fixed portion 52 is preferably provided with a guide groove 55. In the example shown in Fig. 2 and 3, the guide groove 55 is provided on the surface of the first fixed portion 52 on the side of the inner peripheral surface 81d of the split yoke 81.

[0119] 2 and 3 , it is preferable that the winding 41 extends toward the terminal portion 54 so that one end 41 a passes through the guide groove 55. In other words, the guide groove 55 is used as a groove for arranging the winding 41 when the one end 41 a of the winding 41 is led out to the terminal portion 54.

[0120] The boundary between adjacent surfaces of the split yoke 81, for example, the boundary between the first end face 81a and the inner peripheral surface 81d of the split yoke 81, may become rough during the manufacturing process of the split core 80A, and burrs may be formed. Therefore, when one end 41a of the winding 41 is led out to the terminal portion 54, if the one end 41a of the winding 41 is in contact with the boundary between the first end face 81a and the inner peripheral surface 81d of the split yoke 81, the insulating coating of the winding 41 may be damaged by the burrs.

[0121] In contrast, in the coil unit 70A, when the winding 41 extends toward the terminal portion 54 so as to pass through the guide groove 55 on the one end 41a side, when the one end 41a of the winding 41 is led out to the terminal portion 54, the one end 41a side of the winding 41 can avoid the boundary between the first end face 81a and the inner surface 81d of the split yoke 81, thereby preventing damage to the insulating coating of the winding 41.

[0122] Furthermore, in coil unit 70A, if winding 41 extends toward terminal portion 54 so as to pass through guide groove 55 on the one end 41a side, when housing 100 is attached to stator 20A as shown in Figure 7, one end 41a side of winding 41 is less likely to come into contact with housing 100, making it easier to ensure insulation between winding 41 and housing 100.

[0123] As shown in FIG. 4, it is preferable that a third groove 84 extending in the axial direction is provided on the outer peripheral surface 81c of the split yoke 81.

[0124] 4, the third groove 84 is preferably provided so as to open in the axial direction across both the first end face 81a side and the second end face 81b side of the split yoke 81, in this case, across both the first groove 82 side and the second groove 83 side. More specifically, the third groove 84 is preferably provided so as to connect the first end face 81a and the second end face 81b of the split yoke 81 in the axial direction, in this case, to connect the first groove 82 and the second groove 83.

[0125] The three-dimensional shape of the third groove 84 is not limited to the three-dimensional shape shown in FIG.

[0126] 2 and 3, it is preferable that the outer peripheral surface 81c of the split yoke 81 is fitted into the pillar portion 51. More specifically, it is preferable that the pillar portion 51 is fitted into a third groove 84 provided in the outer peripheral surface 81c of the split yoke 81. This firmly fixes the pillar portion 51 to the split yoke 81 and makes it easy to position the pillar portion 51 in the circumferential and radial directions.

[0127] In the coil unit 70A, the first groove 82 is engaged with the first fixing portion 52, the second groove 83 is engaged with the second fixing portion 53, and the third groove 84 is engaged with the pillar portion 51, thereby firmly fixing the terminal member 50A to the split yoke 81 and facilitating positioning of the terminal member 50A in the axial, circumferential, and radial directions.

[0128] In the split core 80A of the coil unit 70A, when the third groove 84 is provided in the outer peripheral surface 81c of the split yoke 81, the third groove 84 is formed simultaneously with the molding of the split core 80A, similar to the first groove 82 and the second groove 83. In other words, when manufacturing the coil unit 70A, there is no need to perform additional processing on the molded split core 80A to provide the first groove 82, the second groove 83, and the third groove 84 in the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70A.

[0129] Furthermore, when manufacturing the coil unit 70A, there is no need to perform additional processing on the molded split core 80A to provide the first groove 82, the second groove 83, and the third groove 84 in the split yoke 81, so no damage is caused to the split core 80A, and as a result, the reduction in strength of the coil unit 70A (more specifically, the split core 80A) is suppressed.

[0130] In coil unit 70A, even if third groove 84 provided in split yoke 81 is shallower than, for example, the screw hole described in Patent Document 1, it still functions when fitting outer peripheral surface 81c of split yoke 81 with column portion 51. Therefore, in coil unit 70A, even if third groove 84 is provided in split yoke 81, the effect on magnetic characteristics is minimized.

[0131] 3, in the coil unit 70A, it is preferable that the terminal members 50A, in this case the pillar portions 51, the first fixing portion 52, and the second fixing portion 53, do not protrude radially beyond the outer peripheral surface 81c of the split yoke 81. In this case, even in a state in which the terminal members 50A are provided, an increase in the radial dimension of the coil unit 70A is suppressed.

[0132] In the coil unit 70A, in an embodiment in which the terminal member 50A does not protrude radially beyond the outer peripheral surface 81c of the split yoke 81, the outer end of the terminal member 50A may be located at the same position as the outer peripheral surface 81c of the split yoke 81 in the radial direction, or may be located on the inner peripheral surface 81d side of the split yoke 81.

[0133] 2, in coil unit 70A, it is preferable that terminal members 50A, here, first fixed portion 52 and second fixed portion 53, do not protrude radially beyond inner circumferential surface 81d of split yoke 81. In this case, even when terminal members 50A are provided, terminal members 50A are less likely to interfere with coil 40A (winding 41), and therefore, a decrease in the space factor of coil 40A (winding 41) due to terminal members 50A is suppressed.

[0134] In the coil unit 70A, in a configuration in which the terminal member 50A does not protrude radially beyond the inner surface 81d of the split yoke 81, the inner end of the terminal member 50A may be positioned at the same position as the inner surface 81d of the split yoke 81 in the radial direction, or may be positioned on the outer surface 81c side of the split yoke 81.

[0135] Second Embodiment In a stator according to a second embodiment of the present invention, the first fixing portion is accommodated inside the first groove in the axial direction.

[0136] The stator of the second embodiment of the present invention may be similar to the stator of the first embodiment of the present invention except for the above points.

[0137] Fig. 8 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 2 of the present invention. Fig. 9 is a schematic perspective view showing a divided core in Fig. 8. Fig. 10 is a schematic perspective view showing a terminal member in Fig. 8.

[0138] The coil unit 70B shown in FIG. 8 includes a split core 80A (see FIG. 9), a coil 40A, and a terminal member 50B (see FIG. 10).

[0139] 8 , the first fixed portion 52 is accommodated within the first groove 82 in the axial direction. In other words, the first fixed portion 52 does not protrude in the axial direction from the first groove 82. In such a configuration, the outer end of the first fixed portion 52 may be located at the same position as the outer end of the first groove 82 in the axial direction, or may be located on the inner end (bottom) side of the first groove 82.

[0140] In the coil unit 70B, the first fixing portion 52 is accommodated in the first groove 82 in the axial direction, which suppresses an increase in the axial dimension of the coil unit 70B. Therefore, a stator in which a plurality of coil units 70B are arranged in a ring shape in the circumferential direction, and further a motor incorporating the above-described stator, can be easily made low-profile.

[0141] In coil unit 70B, the axial dimension of first groove 82 in Fig. 9 remains the same as in Fig. 4 and the axial dimension of first groove 52 in Fig. 10 is smaller than that in Fig. 5 so that first fixed portion 52 fits inside first groove 82 in the axial direction, but is not limited to this. For example, the axial dimension of first groove 82 may remain the same as in Fig. 5 and the axial dimension of first groove 82 may be larger than that in Fig. 4 so that first fixed portion 52 fits inside first groove 82 in the axial direction.

[0142] In the first and second embodiments, the second fixing portion 53 may protrude from the second groove 83 in the axial direction, or may be accommodated within the second groove 83 in the axial direction. The same applies to the other embodiments.

[0143] <Embodiment 3> In a stator according to embodiment 3 of the present invention, a first groove is provided in a first end face of the yoke so as to open radially toward the outer peripheral surface of the yoke, and the first groove and the first fixing portion are fitted together. A second groove is provided in a second end face of the yoke so as to open radially toward the outer peripheral surface of the yoke, and the second groove and the second fixing portion are fitted together. The three-dimensional shapes of the first groove and the second groove are different from each other.

[0144] In the stator according to the third embodiment of the present invention, the maximum circumferential dimensions of the first groove and the second groove are different from each other.

[0145] In the stator of the third embodiment of the present invention, the maximum circumferential dimension of the first groove is greater than the maximum circumferential dimension of the second groove.

[0146] The stator of the third embodiment of the present invention may be similar to the stators of the first and second embodiments of the present invention except for the above points.

[0147] Fig. 11 is a schematic perspective view showing an example of a coil unit constituting a stator according to a third embodiment of the present invention. Fig. 12 is a schematic perspective view showing a divided core in Fig. 11. Fig. 13 is a schematic perspective view showing a terminal member in Fig. 11.

[0148] The coil unit 70C shown in FIG. 11 includes a split core 80C (see FIG. 12), a coil 40A, and a terminal member 50C (see FIG. 13).

[0149] 11 and 12, the three-dimensional shapes of the first groove 82 and the second groove 83 are different from each other, which makes it easy to distinguish between the first groove 82 and the second groove 83.

[0150] In this specification, the three-dimensional shapes of two elements being different from each other means not only that the types of three-dimensional shapes of the elements are different (e.g., prismatic, cylindrical, etc.), but also that even if the types of three-dimensional shapes of the elements are the same, various dimensions (e.g., axial dimension, circumferential dimension, radial dimension, etc.) are different.

[0151] 11 and 12, the maximum circumferential dimensions of the first grooves 82 and the second grooves 83 are different from each other. More specifically, as shown in Fig. 11 and 12, the maximum circumferential dimension of the first grooves 82 is larger than the maximum circumferential dimension of the second grooves 83.

[0152] In the coil unit 70C, the maximum circumferential dimension of the first groove 82 is larger than the maximum circumferential dimension of the second groove 83. Therefore, when one end 41a of the winding 41 is led out to the terminal portion 54, the one end 41a side of the winding 41 is more likely to avoid the boundary between the first end face 81a and the inner surface 81d of the split yoke 81, thereby making it easier to prevent damage to the insulating coating of the winding 41.

[0153] Furthermore, in the coil unit 70C, the maximum circumferential dimension of the first groove 82 is larger than the maximum circumferential dimension of the second groove 83, which makes it easier to ensure the distance between the first end face 81a of the split yoke 81 and the terminal portion 54, and therefore makes it easier to ensure insulation between the split yoke 81 (split core 80C) and the terminal portion 54.

[0154] Furthermore, in coil unit 70C, the maximum circumferential dimension of the first groove 82 is larger than the maximum circumferential dimension of the second groove 83. Therefore, when a housing (see Figure 7) is attached to a stator consisting of multiple coil units 70C arranged in a ring shape in the circumferential direction, the area where the part of the first end face 81a of the split yoke 81 where the first groove 82 is provided is separated from the housing is wide, making it easier to ensure insulation between the split yoke 81 (split core 80C) and the housing.

[0155] Fourth Embodiment In a stator according to a fourth embodiment of the present invention, the maximum circumferential dimension of the first grooves is smaller than the maximum circumferential dimension of the second grooves.

[0156] The stator of the fourth embodiment of the present invention may be similar to the stators of the first to third embodiments of the present invention except for the above points.

[0157] Fig. 14 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 4 of the present invention. Fig. 15 is a schematic perspective view showing a divided core in Fig. 14. Fig. 16 is a schematic perspective view showing a terminal member in Fig. 14.

[0158] A coil unit 70D shown in FIG. 14 includes a split core 80D (see FIG. 15), a coil 40A, and a terminal member 50D (see FIG. 16).

[0159] As shown in FIGS. 14 and 15, the maximum circumferential dimension of the first grooves 82 is smaller than the maximum circumferential dimension of the second grooves 83 .

[0160] <Embodiment 5> In a stator according to embodiment 5 of the present invention, a first step portion is provided at the bottom of the first groove along the axial direction so that the axial dimension of the first groove is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, and the first fixing portion has a first protrusion that protrudes in the axial direction, and the first step portion and the first protrusion are fitted together.

[0161] In the stator of embodiment 5 of the present invention, a third step portion is provided along the axial direction at the bottom of the second groove so that the axial dimension of the second groove is smaller on the outer peripheral surface side of the yoke than on the inner peripheral surface side, and the second fixing portion has a third protrusion portion that protrudes in the axial direction, and the third step portion and the third protrusion portion are fitted together.

[0162] The stator of the fifth embodiment of the present invention may be similar to the stators of the first to fourth embodiments of the present invention except for the above points.

[0163] Fig. 17 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 5 of the present invention. Fig. 18 is a schematic perspective view showing a divided core in Fig. 17. Fig. 19 is a schematic perspective view showing a terminal member in Fig. 17.

[0164] A coil unit 70E shown in FIG. 17 includes a split core 80E (see FIG. 18), a coil 40A, and a terminal member 50E (see FIG. 19).

[0165] As shown in Figures 17 and 18, a first step portion 82a is provided along the axial direction at the bottom of the first groove 82 (here, the bottom on the axial side of the second groove 83) so that the axial dimension of the first groove 82 is smaller on the outer peripheral surface 81c side of the split yoke 81 than on the inner peripheral surface 81d side.

[0166] 17 and 19, the first fixing portion 52 has a first protrusion 52a that protrudes in the axial direction. In the example shown in Fig. 17 and 19, the first protrusion 52a protrudes in a claw-like shape from the radially innermost position of the first fixing portion 52 (here, the side opposite the column portion 51) toward the second fixing portion 53 in the axial direction.

[0167] 17, the first step portion 82a and the first protrusion portion 52a are fitted together, which firmly fixes the first fixing portion 52 to the split yoke 81 and makes it easy to position the first fixing portion 52 in the axial, circumferential, and radial directions.

[0168] As shown in Figures 17 and 18, a third step portion 83a is provided along the axial direction at the bottom of the second groove 83 (here, the bottom on the axial side of the first groove 82) so that the axial dimension of the second groove 83 is smaller on the outer peripheral surface 81c side of the split yoke 81 than on the inner peripheral surface 81d side.

[0169] 17 and 19, the second fixing portion 53 has a third protrusion 53a that protrudes in the axial direction. In the example shown in Fig. 17 and 19, the third protrusion 53a protrudes in a claw-like shape from the radially innermost position of the second fixing portion 53 (here, the side opposite the column portion 51) toward the first fixing portion 52 in the axial direction.

[0170] 17, the third step portion 83a and the third protrusion portion 53a are fitted together, which firmly fixes the second fixing portion 53 to the split yoke 81 and makes it easy to position the second fixing portion 53 in the axial, circumferential, and radial directions.

[0171] As described above, in the coil unit 70E, the first step portion 82a is engaged with the first protrusion portion 52a, and the third step portion 83a is engaged with the third protrusion portion 53a, so that the terminal member 50E is firmly fixed to the split yoke 81 and it is easy to position the terminal member 50E in the axial, circumferential, and radial directions.

[0172] In the coil unit 70E, the terminal member 50E can be simply pushed into the split yoke 81 from the outer surface 81c side of the split yoke 81 to engage the first step portion 82a with the first protrusion portion 52a, and also engage the third step portion 83a with the third protrusion portion 53a, thereby improving work efficiency when installing the terminal member 50E.

[0173] The number of steps of the first step portion 82a and the third step portion 83a may be independently one or more.

[0174] The number of steps of the first step portion 82a and the third step portion 83a may be the same as or different from each other.

[0175] The three-dimensional shapes of the first protrusion 52a and the third protrusion 53a are not limited to those shown in FIGS.

[0176] When the first step portion 82a has multiple steps, the three-dimensional shape of the first protrusion 52a may be such that the surface of the first protrusion 52a has multiple steps along the surface of the first step portion 82a.

[0177] When the third step portion 83a has multiple steps, the three-dimensional shape of the third protrusion 53a may be such that the surface of the third protrusion 53a has multiple steps along the surface of the third step portion 83a.

[0178] The three-dimensional shapes of the first protrusion 52a and the third protrusion 53a may be the same as or different from each other.

[0179] As a modified example of the coil unit 70E, either the mating portion between the first step portion 82a and the first protrusion 52a or the mating portion between the third step portion 83a and the third protrusion 53a may not be provided. For example, if the first step portion 82a is provided in the first groove 82 and the first fixing portion 52 has the first protrusion 52a, the third step portion 83a may not be provided in the second groove 83 and the second fixing portion 53 may not have the third protrusion 53a. Alternatively, if the third step portion 83a is provided in the second groove 83 and the second fixing portion 53 has the third protrusion 53a, the first step portion 82a may not be provided in the first groove 82 and the first fixing portion 52 may not have the first protrusion 52a.

[0180] <Embodiment 6> In a stator according to embodiment 6 of the present invention, a second step portion is provided along the circumferential direction on the side of the first groove so that the circumferential dimension of the first groove is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, and the first fixing portion has a second protruding portion that protrudes in the circumferential direction, and the second step portion and the second protruding portion are fitted together.

[0181] In the stator of embodiment 6 of the present invention, a fourth step portion is provided along the circumferential direction on the side of the second groove so that the circumferential dimension of the second groove is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, and the second fixing portion has a fourth protrusion protruding in the circumferential direction, and the fourth step portion and the fourth protrusion are fitted together.

[0182] Except for the above points, the stator of the sixth embodiment of the present invention may be similar to the stators of the first to fifth embodiments (including the modified examples) of the present invention.

[0183] Fig. 20 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 6 of the present invention. Fig. 21 is a schematic perspective view showing a divided core in Fig. 20. Fig. 22 is a schematic perspective view showing a terminal member in Fig. 20.

[0184] A coil unit 70F shown in FIG. 20 includes a split core 80F (see FIG. 21), a coil 40A, and a terminal member 50F (see FIG. 22).

[0185] As shown in Figures 20 and 21, second step portions 82ba and 82bb are provided on the side of the first groove 82 along the circumferential direction so that the circumferential dimension of the first groove 82 is smaller on the outer peripheral surface 81c side of the split yoke 81 than on the inner peripheral surface 81d side.

[0186] 20 and 22, the first fixing portion 52 has second protrusions 52ba and 52bb that protrude in the circumferential direction. In the example shown in Fig. 20 and 22, the second protrusions 52ba and 52bb protrude in opposite directions in the circumferential direction from the innermost position in the radial direction of the first fixing portion 52 (here, the side opposite the column portion 51).

[0187] 20 , the second step portion 82ba is fitted to the second protrusion portion 52ba, and the second step portion 82bb is fitted to the second protrusion portion 52bb, thereby firmly fixing the first fixing portion 52 to the split yoke 81 and facilitating positioning of the first fixing portion 52 in the axial, circumferential, and radial directions.

[0188] As shown in Figures 20 and 21, a fourth step portion 83ba and a fourth step portion 83bb are provided on the side of the second groove 83 along the circumferential direction so that the circumferential dimension of the second groove 83 is smaller on the outer peripheral surface 81c side of the split yoke 81 than on the inner peripheral surface 81d side.

[0189] 20 and 22, the second fixing portion 53 has fourth protrusions 53ba and 53bb that protrude in the circumferential direction. In the example shown in Fig. 20 and 22, the second fixing portion 53 has a snap-fit ​​structure, and the fourth protrusions 53ba and 53bb protrude in opposite directions in the circumferential direction from the innermost position in the radial direction of the second fixing portion 53 (here, the opposite side from the column portion 51).

[0190] 20 , the fourth step portion 83ba is fitted to the fourth protrusion 53ba, and the fourth step portion 83bb is fitted to the fourth protrusion 53bb, thereby firmly fixing the second fixing portion 53 to the split yoke 81 and facilitating positioning of the second fixing portion 53 in the axial, circumferential, and radial directions.

[0191] As described above, in the coil unit 70F, the second step portion 82ba is engaged with the second protrusion portion 52ba, the second step portion 82bb is engaged with the second protrusion portion 52bb, the fourth step portion 83ba is engaged with the fourth protrusion portion 53ba, and the fourth step portion 83bb is engaged with the fourth protrusion portion 53bb, thereby firmly fixing the terminal member 50F to the split yoke 81 and facilitating positioning of the terminal member 50F in the axial, circumferential, and radial directions.

[0192] In the coil unit 70F, the work efficiency when attaching the terminal member 50F is improved. In particular, in the coil unit 70F, since the second fixing portion 53 has a snap-fit ​​structure, simply by pushing the second fixing portion 53 into the split yoke 81 from the side of the outer circumferential surface 81c of the split yoke 81, the fourth step portion 83ba can be fitted into the fourth protrusion 53ba, and the fourth step portion 83bb can be fitted into the fourth protrusion 53bb.

[0193] Furthermore, in coil unit 70F, because terminal member 50F is attached to split yoke 81 in the above-described fitting manner, even if the axial dimensions of first groove 82 and second groove 83 are smaller than in coil unit 70A (see FIGS. 2 and 3 ), terminal member 50F is firmly fixed to split yoke 81. In this way, in coil unit 70F, it is possible to reduce the axial dimensions of first groove 82 and second groove 83, so even in a state where terminal member 50F is provided, terminal member 50F is less likely to interfere with coil 40A (winding 41), and therefore a decrease in the space factor of coil 40A (winding 41) due to terminal member 50F is suppressed.

[0194] The number of steps of the second step portion 82ba, the second step portion 82bb, the fourth step portion 83ba, and the fourth step portion 83bb may be one or more, independently of each other.

[0195] The number of steps of the second step portion 82ba, the second step portion 82bb, the fourth step portion 83ba, and the fourth step portion 83bb may be the same as one another, may be different from one another, or may be partially different from one another.

[0196] The three-dimensional shapes of the second protrusion 52ba, the second protrusion 52bb, the fourth protrusion 53ba, and the fourth protrusion 53bb are not limited to the three-dimensional shapes shown in FIGS. 20 and 22 .

[0197] When the second step portion 82ba has a plurality of steps, the three-dimensional shape of the second protruding portion 52ba may be such that the surface of the second protruding portion 52ba has a staircase shape with a plurality of steps along the surface of the second step portion 82ba.

[0198] When the second step portion 82bb has multiple steps, the three-dimensional shape of the second protrusion 52bb may have a surface in the form of multiple steps along the surface of the second step portion 82bb.

[0199] When the fourth step portion 83ba has multiple steps, the three-dimensional shape of the fourth protrusion 53ba may be such that the surface of the fourth protrusion 53ba has a multiple-step staircase shape along the surface of the fourth step portion 83ba.

[0200] When the fourth step portion 83bb has multiple steps, the three-dimensional shape of the fourth protrusion 53bb may be such that the surface of the fourth protrusion 53bb has a multiple-step staircase shape along the surface of the fourth step portion 83bb.

[0201] The three-dimensional shapes of the second protrusion 52ba, the second protrusion 52bb, the fourth protrusion 53ba, and the fourth protrusion 53bb may be the same as one another, may be different from one another, or may be partially different from one another.

[0202] As a modified example of the coil unit 70F, up to three of the mating portions between the second step portion 82ba and the second protrusion 52ba, the mating portion between the second step portion 82bb and the second protrusion 52bb, the mating portion between the fourth step portion 83ba and the fourth protrusion 53ba, and the mating portion between the fourth step portion 83bb and the fourth protrusion 53bb may not be provided. For example, if the second step portion 82ba and the second step portion 82bb are provided in the first groove 82 and the first fixing portion 52 has the second protrusion 52ba and the second protrusion 52bb, the fourth step portion 83ba and the fourth step portion 83bb may not be provided in the second groove 83 and the second fixing portion 53 may not have the fourth protrusion 53ba and the fourth protrusion 53bb.

[0203] <Embodiment 7> In a stator according to embodiment 7 of the present invention, the first groove is tapered such that the circumferential dimension thereof decreases from the inner peripheral surface side of the yoke toward the outer peripheral surface side, and the first fixing portion has a tapered first tapered portion whose circumferential dimension decreases from the inner peripheral surface side of the yoke toward the outer peripheral surface side, and the first groove and the first tapered portion are fitted together.

[0204] In the stator of embodiment 7 of the present invention, the second groove is tapered such that the circumferential dimension decreases from the inner circumferential surface side of the yoke toward the outer circumferential surface side, and the second fixing portion has a tapered second tapered portion whose circumferential dimension decreases from the inner circumferential surface side of the yoke toward the outer circumferential surface side, and the second groove and the second tapered portion are fitted together.

[0205] Except for the above points, the stator of the seventh embodiment of the present invention may be similar to the stators of the first to fifth embodiments (including the modified examples) of the present invention.

[0206] Fig. 23 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 7 of the present invention. Fig. 24 is a schematic perspective view showing a divided core in Fig. 23. Fig. 25 is a schematic perspective view showing a terminal member in Fig. 23.

[0207] A coil unit 70G shown in FIG. 23 includes a split core 80G (see FIG. 24), a coil 40A, and a terminal member 50G (see FIG. 25).

[0208] As shown in FIGS. 23 and 24, the first groove 82 has a tapered shape in which the circumferential dimension decreases from the inner peripheral surface 81d side of the split yoke 81 toward the outer peripheral surface 81c side.

[0209] 23 and 25, the first fixed portion 52 has a first tapered portion 52c whose circumferential dimension decreases from the inner peripheral surface 81d toward the outer peripheral surface 81c of the split yoke 81. In the example shown in Fig. 23 and 25, the first fixed portion 52 has the first tapered portion 52c at a position closer to the second fixed portion 53 in the axial direction.

[0210] 23, the first groove 82 and the first tapered portion 52c are fitted together, which not only firmly fixes the first fixing portion 52 to the split yoke 81 but also makes it easy to position the first fixing portion 52 in the axial, circumferential, and radial directions.

[0211] As shown in FIGS. 23 and 24, the second groove 83 has a tapered shape in which the circumferential dimension decreases from the inner peripheral surface 81d side of the split yoke 81 toward the outer peripheral surface 81c side.

[0212] 23 and 25, the second fixed portion 53 has a second tapered portion 53c whose circumferential dimension decreases from the inner peripheral surface 81d toward the outer peripheral surface 81c of the split yoke 81. In the example shown in Fig. 23 and 25, the second fixed portion 53 is composed of the second tapered portion 53c.

[0213] 23, the second groove 83 and the second tapered portion 53c are fitted together, which not only firmly fixes the second fixing portion 53 to the split yoke 81 but also makes it easy to position the second fixing portion 53 in the axial, circumferential, and radial directions.

[0214] As described above, in the coil unit 70G, the first groove 82 is fitted into the first tapered portion 52c, and the second groove 83 is fitted into the second tapered portion 53c, thereby firmly fixing the terminal member 50G to the split yoke 81 and facilitating positioning of the terminal member 50G in the axial, circumferential, and radial directions.

[0215] In the coil unit 70G, work efficiency during attachment of the terminal member 50G is improved. From the viewpoint of work efficiency during attachment of the terminal member 50G, for example, a slit may be provided in the second tapered portion 53c. If a slit is provided in the second tapered portion 53c, the second tapered portion 53c (second fixing portion 53) becomes more flexible, and therefore the second groove 83 and the second tapered portion 53c can be easily fitted together. The slit may be provided, for example, in the circumferential direction or the radial direction.

[0216] Furthermore, in coil unit 70G, because terminal member 50G is attached to split yoke 81 in the above-described fitting manner, even if the axial dimensions of first groove 82 and second groove 83 are smaller than in coil unit 70A (see FIGS. 2 and 3 ), terminal member 50G is firmly fixed to split yoke 81. In this way, in coil unit 70G, because it is possible to reduce the axial dimensions of first groove 82 and second groove 83, even when terminal member 50G is provided, terminal member 50G is less likely to interfere with coil 40A (winding 41), and therefore a decrease in the space factor of coil 40A (winding 41) due to terminal member 50G is suppressed.

[0217] Furthermore, in the split core 80G of the coil unit 70G, the first grooves 82 and the second grooves 83 are easier to form than in the split core 80F of the coil unit 70F (see FIG. 21).

[0218] The axial dimensions of the first groove 82 and the first tapered portion 52c may be the same or different. When the axial dimensions of the first groove 82 and the first tapered portion 52c are different, the axial dimension of the first groove 82 may be larger than the axial dimension of the first tapered portion 52c or may be smaller than the axial dimension of the first tapered portion 52c.

[0219] The axial dimensions of the second groove 83 and the second tapered portion 53c may be the same or different. When the axial dimensions of the second groove 83 and the second tapered portion 53c are different from each other, the axial dimension of the second groove 83 may be larger than the axial dimension of the second tapered portion 53c or may be smaller than the axial dimension of the second tapered portion 53c.

[0220] The three-dimensional shapes of the first groove 82 and the second groove 83 are not limited to those shown in FIGS. 23 and 24, as long as they are tapered as described above.

[0221] The three-dimensional shapes of the first groove 82 and the second groove 83 may be the same as each other or may be different from each other.

[0222] The three-dimensional shapes of the first tapered portion 52c and the second tapered portion 53c are not limited to the three-dimensional shapes shown in FIGS. 23 and 25, as long as they are the tapered shapes described above.

[0223] The three-dimensional shapes of the first tapered portion 52c and the second tapered portion 53c may be the same as each other or may be different from each other.

[0224] As a modified example of coil unit 70G, one of the mating portion between first groove 82 and first tapered portion 52c and the mating portion between second groove 83 and second tapered portion 53c may not be provided. For example, if first groove 82 is tapered and first fixing portion 52 has first tapered portion 52c, second groove 83 may not be tapered and second fixing portion 53 may not have second tapered portion 53c. Alternatively, if second groove 83 is tapered and second fixing portion 53 has second tapered portion 53c, first groove 82 may not be tapered and first fixing portion 52 may not have first tapered portion 52c.

[0225] <Embodiment 8> In a stator according to embodiment 8 of the present invention, a first recess recessed in the axial direction is provided on one of the bottom of the first groove and the first fixed portion, and a first convex portion protruding in the axial direction is provided on the other of the bottom of the first groove and the first fixed portion, and the first recess and the first convex portion are fitted together.

[0226] In the stator of embodiment 8 of the present invention, a second recess recessed in the axial direction is provided on one of the bottom of the second groove and the second fixed portion, and a second convex portion protruding in the axial direction is provided on the other of the bottom of the second groove and the second fixed portion, and the second recess and the second convex portion are fitted together.

[0227] Except for the above points, the stator of the eighth embodiment of the present invention may be similar to the stators of the first to seventh embodiments (including the modified examples) of the present invention.

[0228] Fig. 26 is a schematic perspective view showing an example of a coil unit constituting a stator according to embodiment 8 of the present invention. Fig. 27 is a schematic perspective view showing a divided core in Fig. 26. Fig. 28 is a schematic perspective view showing a terminal member in Fig. 26.

[0229] A coil unit 70H shown in FIG. 26 includes a split core 80H (see FIG. 27), a coil 40A, and a terminal member 50H (see FIG. 28).

[0230] 26 and 27 , a first recess 91a recessed in the axial direction is provided in the bottom of the first groove 82 (here, the bottom on the second groove 83 side in the axial direction). In the example shown in Fig. 26 and 27 , the first recess 91a is recessed in the axial direction from a position spaced apart from the periphery at the bottom of the first groove 82 toward the second groove 83.

[0231] 26 and 28, a first protrusion 92a protruding in the axial direction is provided on the first fixed portion 52. In the example shown in Fig. 26 and 28, the first protrusion 92a protrudes in the axial direction from a position spaced apart from the periphery on the bottom surface of the first fixed portion 52 (here, the surface on the second fixed portion 53 side) toward the second fixed portion 53.

[0232] 26, the first recess 91a and the first protrusion 92a are fitted together, which firmly fixes the first fixing portion 52 to the split yoke 81 and makes it easy to position the first fixing portion 52 in the axial, circumferential, and radial directions.

[0233] 26 and 27 , a second recess 91b recessed in the axial direction is provided in the bottom of the second groove 83 (here, the bottom on the first groove 82 side in the axial direction). In the example shown in Fig. 26 and 27 , the second recess 91b is recessed in the axial direction from a position spaced apart from the periphery at the bottom of the second groove 83 toward the first groove 82.

[0234] 26 and 28, a second protrusion 92b protruding in the axial direction is provided on the second fixed portion 53. In the example shown in Fig. 26 and 28, the second protrusion 92b protrudes in the axial direction from a position spaced apart from the periphery on the top surface of the second fixed portion 53 (here, the surface on the first fixed portion 52 side) toward the first fixed portion 52.

[0235] 26, the second recess 91b and the second protrusion 92b are fitted together, which firmly fixes the second fixing portion 53 to the split yoke 81 and makes it easy to position the second fixing portion 53 in the axial, circumferential, and radial directions.

[0236] As described above, in the coil unit 70H, the first recess 91a and the first protrusion 92a are engaged with each other, and the second recess 91b and the second protrusion 92b are engaged with each other, so that the terminal member 50H is firmly fixed to the split yoke 81 and it is easy to position the terminal member 50H in the axial, circumferential, and radial directions.

[0237] In the coil unit 70H, the terminal member 50H can be simply pushed into the split yoke 81 from the outer surface 81c side of the split yoke 81 to engage the first recess 91a with the first protrusion 92a, and the second recess 91b with the second protrusion 92b, thereby improving work efficiency when installing the terminal member 50H.

[0238] Furthermore, in coil unit 70H, because terminal member 50H is attached to split yoke 81 in the above-described fitting manner, even if the axial dimensions of first groove 82 and second groove 83 are smaller than in coil unit 70A (see FIGS. 2 and 3), terminal member 50H is firmly fixed to split yoke 81. In this way, in coil unit 70H, it is possible to reduce the axial dimensions of first groove 82 and second groove 83, so even when terminal member 50H is provided, terminal member 50H is less likely to interfere with coil 40A (winding 41), and therefore a decrease in the space factor of coil 40A (winding 41) due to terminal member 50H is suppressed.

[0239] The three-dimensional shapes of the first recess 91a and the second recess 91b are not limited to those shown in FIGS.

[0240] The three-dimensional shapes of the first recess 91a and the second recess 91b may be the same as each other or may be different from each other.

[0241] The three-dimensional shapes of the first convex portion 92a and the second convex portion 92b are not limited to those shown in FIGS.

[0242] The three-dimensional shapes of the first convex portion 92a and the second convex portion 92b may be the same as each other or may be different from each other.

[0243] One or more mating portions between the first recess 91 a and the first protrusion 92 a may be provided for each combination of the first groove 82 and the first fixing portion 52. In other words, one or more of each of the first recess 91 a and the first protrusion 92 a may be provided.

[0244] When multiple mating portions between the first recess 91a and the first protrusion 92a are provided, the positional relationship between the multiple mating portions is not particularly limited, and for example, the mating portions may be provided so as to be spaced apart in the circumferential direction or so as to be spaced apart in the radial direction.

[0245] One or more fitting portions between the second recess 91b and the second protrusion 92b may be provided for each combination of the second groove 83 and the second fixing portion 53. In other words, one or more second recesses 91b and second protrusions 92b may be provided.

[0246] When multiple mating portions between the second recess 91b and the second protrusion 92b are provided, the positional relationship between the multiple mating portions is not particularly limited, and for example, the mating portions may be arranged so as to be spaced apart in the circumferential direction or so as to be spaced apart in the radial direction.

[0247] In addition, as a modified example of the coil unit 70H, the first recess 91a may be provided in the first fixing portion 52 instead of the bottom of the first groove 82, and the first convex portion 92a may be provided in the bottom of the first groove 82 instead of the first fixing portion 52.

[0248] In addition, as a modified example of the coil unit 70H, the second recess 91b may be provided on the second fixing portion 53 instead of the bottom of the second groove 83, and the second protrusion 92b may be provided on the bottom of the second groove 83 instead of the second fixing portion 53.

[0249] Furthermore, as a modified example of coil unit 70H, one of the mating portion between first recess 91a and first protrusion 92a and the mating portion between second recess 91b and second protrusion 92b may not be provided. For example, when first recess 91a is provided at the bottom of first groove 82 and first fixing portion 52 is provided with first protrusion 92a, second recess 91b may not be provided at the bottom of second groove 83 and second fixing portion 53 may not be provided with second protrusion 92b. Alternatively, when second recess 91b is provided at the bottom of second groove 83 and second fixing portion 53 is provided with second protrusion 92b, first recess 91a may not be provided at the bottom of first groove 82 and first fixing portion 52 may not be provided with first protrusion 92a.

[0250] Ninth Embodiment In a stator according to a ninth embodiment of the present invention, the terminal member has two terminal portions.

[0251] In the stator of embodiment 9 of the present invention, one end of the winding is fixed in a state where it is wound around one of the two terminal portions, and the other end of the winding is fixed in a state where it is wound around the other of the two terminal portions.

[0252] Except for the above points, the stator of the ninth embodiment of the present invention may be similar to the stators of the first to eighth embodiments (including the modified examples) of the present invention.

[0253] FIG. 29 is a schematic perspective view showing an example of a stator according to a ninth embodiment of the present invention.

[0254] A stator 20J shown in FIG. 29 includes a stator core 30J, a plurality of coils 40A, and a plurality of terminal members 50J.

[0255] The stator 20J is formed by arranging a plurality of coil units 70J in an annular shape in the circumferential direction.

[0256] In the stator 20J, the windings 41 of the multiple coils 40A are connected in parallel, for example.

[0257] In the stator 20J, the multiple coils 40A include, for example, in the case of a three-phase stator, a coil formed by a U-phase winding, a coil formed by a V-phase winding, and a coil formed by a W-phase winding. In this case, the U-phase winding, the V-phase winding, and the W-phase winding are connected in a star connection or a delta connection.

[0258] Each of the plurality of terminal members 50J has a pillar portion 51, a first fixing portion 52, a second fixing portion 53, a terminal portion 54a, and a terminal portion 54b.

[0259] The terminal portion 54a and the terminal portion 54b are provided on the first fixed portion 52 so as to protrude from the first fixed portion 52 at positions spaced apart from each other in the circumferential direction.

[0260] The constituent materials of the terminal portion 54a and the terminal portion 54b may be the same as or different from each other.

[0261] The three-dimensional shapes of the terminal portion 54a and the terminal portion 54b may be the same as each other or may be different from each other.

[0262] One end 41a of the winding 41 is wound around and fixed to the terminal portion 54a, so that the one end 41a of the winding 41 is led out to the terminal member 50J.

[0263] The other end 41b of the winding 41 is wound around and fixed to the terminal portion 54b, so that the other end 41b of the winding 41 is led out to the terminal member 50J.

[0264] In the stator 20J, it is sufficient that there is at least one coil 40A among the plurality of coils 40A in which one end 41a of the winding 41 is fixed in a state where it is wound around the terminal portion 54a and the other end 41b of the winding 41 is fixed in a state where it is wound around the terminal portion 54b. In other words, among the plurality of coils 40A, for all of the coils 40A, one end 41a of the winding 41 may be fixed in a state where it is wound around the terminal portion 54a and the other end 41b of the winding 41 may be fixed in a state where it is wound around the terminal portion 54b, or for some of the coils 40A, one end 41a of the winding 41 may be fixed in a state where it is wound around the terminal portion 54a and the other end 41b of the winding 41 may be fixed in a state where it is wound around the terminal portion 54b. Among the multiple coils 40A, for some of the coils 40A, one end 41a of the winding 41 is fixed in a state where it is wound around the terminal portion 54a, and the other end 41b of the winding 41 is fixed in a state where it is wound around the terminal portion 54b, but for the remaining coils 40A, at least one of the one end 41a and the other end 41b of the winding 41 does not have to be fixed in a state where it is wound around the terminal portion.

[0265] In the above embodiment, the stator core has a split structure divided into split cores, but in the stator of the present invention, the stator core may also have an integrated structure that is not divided.

[0266] In a stator with a split stator core, the coils can be arranged more densely than in a stator with an integrated stator core, which results in a larger number of coils. Therefore, a stator with a split stator core can more easily improve motor characteristics than a stator with an integrated stator core.

[0267] In the above embodiments, the first end surface of the yoke is fitted to the first fixed portion, and the second end surface of the yoke is fitted to the second fixed portion. However, in the stator of the present invention, the fitting manner between the first end surface of the yoke and the first fixed portion and the fitting manner between the second end surface of the yoke and the second fixed portion may be the same or different. In the stator of the present invention, when the fitting manner between the first end surface of the yoke and the first fixed portion and the fitting manner between the second end surface of the yoke and the second fixed portion are different from each other, for example, a stator may be combined in which a tapered first groove in the first end surface of the yoke is fitted to the first tapered portion of the first fixed portion (see embodiment 7) and a stator in which a third step portion at the bottom of the second groove in the second end surface of the yoke is fitted to the third protrusion of the second fixed portion (see embodiment 5).

[0268] In the above embodiment, the first groove provided on the first end surface of the yoke is fitted with the first fixing portion of the terminal member, and the second groove provided on the second end surface of the yoke is fitted with the second fixing portion of the terminal member. However, in the stator of the present invention, the yoke does not have to be provided with at least one of the first groove and the second groove. In the stator of the present invention, when the yoke is not provided with both the first groove and the second groove, the terminal member may simply sandwich the yoke in the axial direction.

[0269] The stator of the present invention may be used not only as a component of a motor, which will be described later, but also as a component of a generator, for example.

[0270] [Motor] A motor of the present invention is characterized by including the stator of the present invention and a rotor provided opposite to the inner peripheral surface of the stator.

[0271] FIG. 30 is a schematic perspective view showing an example of a motor according to the present invention.

[0272] A motor 1A shown in FIG. 30 includes a rotor 10A and a stator 20A.

[0273] In the motor 1A, the rotor 10A is positioned coaxially inside the axis line AX, and the stator 20A is positioned coaxially outside the axis line AX. The axis line AX corresponds to the rotation axis of the rotor 10A.

[0274] The rotor 10A is disposed opposite the inner peripheral surface of the stator 20A.

[0275] The rotor 10A includes, for example, a rotor yoke 11, a shaft 12, and a permanent magnet 13.

[0276] The rotor yoke 11 is made of, for example, a bulk soft magnetic material, an electromagnetic steel sheet, a powder magnetic core, a resin molded body containing a soft magnetic material, or the like.

[0277] The shaft 12 is inserted through the rotor yoke 11 .

[0278] Examples of materials that can be used to form the shaft 12 include metals such as stainless steel.

[0279] The direction in which the shaft 12 extends, i.e., the direction in which the axis line AX extends, is parallel to the axial direction.

[0280] The permanent magnets 13 are arranged along the outer circumferential surface of the rotor yoke 11 so that the north and south poles are arranged alternately.

[0281] When viewed in the axial direction, the rotor 10A may have a substantially circular shape or a substantially polygonal shape.

[0282] In this embodiment, a motor having a stator 20A in which multiple coil units 70A are arranged in a ring shape in the circumferential direction is shown, but the same applies to motors having stators in which other coil units, such as coil unit 70B, are arranged in a ring shape in the circumferential direction.

[0283] The motor of the present invention may further include a wiring board electrically connected to one end of the winding.

[0284] The wiring board may be provided with a plurality of through holes that penetrate between the one main surface and the other main surface and are spaced apart from each other in the circumferential direction.

[0285] In the wiring board, a terminal may be exposed on the inner wall surface of each through hole.

[0286] The wiring board may be placed in the axial direction relative to the stator so that the terminal portions of the multiple terminal members (see FIG. 1) of the stator pass through separate through holes.

[0287] When the above-described wiring board is placed axially on the stator, one end of the winding wound around the terminal portion of the terminal member can be efficiently connected to the terminal exposed on the inner wall surface of the through hole of the wiring board. Therefore, a motor having the above-described wiring board can easily achieve electrical connection between one end of the winding and the terminal of the wiring board.

[0288] The motor of the present invention may further include a housing (see FIG. 7) for protecting the stator core of the stator.

[0289] When the motor includes a wiring board and a housing, the wiring board may be provided inside the housing or outside the housing.

[0290] The present specification discloses the following:

[0291] <1> A stator core including an annular yoke extending along a circumferential direction and teeth protruding from an inner peripheral surface of the yoke in a radial direction of the yoke and formed of a compact of magnetic powder; a coil formed of a winding wound around the teeth; and a terminal member including: a pillar portion extending in an axial direction of the stator core; a first fixed portion provided at one end of the pillar portion in the axial direction so as to protrude further toward the inner peripheral surface of the yoke than the pillar portion in the radial direction; a second fixed portion provided at the other end of the pillar portion in the axial direction so as to protrude further toward the inner peripheral surface of the yoke than the pillar portion in the radial direction; and a terminal portion provided on the first fixed portion so as to protrude from the first fixed portion, wherein the yoke has a first end face and a second end face opposing each other in the axial direction, the terminal member sandwiches the yoke in the axial direction so that the pillar portion faces the outer peripheral surface of the yoke in the radial direction, the first fixed portion faces the first end face of the yoke, and the second fixed portion faces the second end face of the yoke, and one end of the winding is fixed in a state where it is wound around the terminal portion.

[0292] <2> The stator according to <1>, wherein the first end surface of the yoke and the first fixing portion are fitted together.

[0293] <3> The stator according to <2>, wherein a first groove is provided in the first end surface of the yoke so as to open toward the outer circumferential surface of the yoke in the radial direction, and the first groove and the first fixing portion are fitted together.

[0294] <4> The stator according to <3>, wherein the first fixing portion protrudes from the first groove in the axial direction.

[0295] <5> The stator according to <3>, wherein the first fixing portion is housed inside the first groove in the axial direction.

[0296] <6> The stator according to any one of <3> to <5>, wherein a first step portion is provided along the axial direction at a bottom of the first groove such that a dimension of the first groove in the axial direction is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, the first fixing portion has a first protrusion protruding in the axial direction, and the first step portion and the first protrusion are fitted together.

[0297] <7> The stator according to any one of <3> to <6>, wherein a second step portion is provided along the circumferential direction on a side portion of the first groove such that a dimension of the first groove in the circumferential direction is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, the first fixing portion has a second protruding portion protruding in the circumferential direction, and the second step portion and the second protruding portion are fitted together.

[0298] <8> The stator according to any one of <3> to <6>, wherein the first groove has a tapered shape such that the circumferential dimension thereof decreases from the inner peripheral surface side toward the outer peripheral surface side of the yoke, the first fixing portion has a tapered first tapered portion such that the circumferential dimension thereof decreases from the inner peripheral surface side toward the outer peripheral surface side of the yoke, and the first groove and the first tapered portion are fitted together.

[0299] <9> The stator according to any one of <3> to <8>, wherein a first recess recessed in the axial direction is provided on one of a bottom of the first groove and the first fixed portion, and a first protrusion protruding in the axial direction is provided on the other of the bottom of the first groove and the first fixed portion, and the first recess and the first protrusion are fitted together.

[0300] <10> The stator according to any one of <1> to <9>, wherein the second end surface of the yoke and the second fixing portion are fitted together.

[0301] <11> The stator according to <10>, wherein a second groove is provided in the second end surface of the yoke so as to open toward the outer circumferential surface of the yoke in the radial direction, and the second groove and the second fixing portion are fitted together.

[0302] <12> The stator according to <11>, wherein a third step portion is provided along the axial direction at a bottom of the second groove so that the axial dimension of the second groove is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, the second fixing portion has a third protrusion protruding in the axial direction, and the third step portion and the third protrusion are fitted together.

[0303] <13> The stator according to <11> or <12>, wherein a fourth step portion is provided along the circumferential direction on a side portion of the second groove such that a circumferential dimension of the second groove is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, the second fixing portion has a fourth protrusion protruding in the circumferential direction, and the fourth step portion and the fourth protrusion are fitted together.

[0304] <14> The stator according to <11> or <12>, wherein the second groove has a tapered shape such that the circumferential dimension thereof decreases from the inner peripheral surface side toward the outer peripheral surface side of the yoke, the second fixing portion has a tapered second tapered portion such that the circumferential dimension thereof decreases from the inner peripheral surface side toward the outer peripheral surface side of the yoke, and the second groove and the second tapered portion are fitted together.

[0305] <15> The stator according to any one of <11> to <14>, wherein a second recess recessed in the axial direction is provided on one of a bottom of the second groove and the second fixing portion, and a second protrusion protruding in the axial direction is provided on the other of the bottom of the second groove and the second fixing portion, and the second recess and the second protrusion are fitted together.

[0306] <16> The stator according to <1>, wherein a first groove is provided in the first end surface of the yoke so as to open toward the outer peripheral surface of the yoke in the radial direction, the first groove and the first fixing portion are fitted together, and a second groove is provided in the second end surface of the yoke so as to open toward the outer peripheral surface of the yoke in the radial direction, the second groove and the second fixing portion are fitted together, and the three-dimensional shapes of the first groove and the second groove are different from each other.

[0307] <17> The stator according to <16>, wherein the first groove and the second groove have different maximum dimensions in the circumferential direction.

[0308] <18> The stator according to <17>, wherein a maximum dimension of the first groove in the circumferential direction is greater than a maximum dimension of the second groove in the circumferential direction.

[0309] <19> The stator according to any one of <1> to <18>, wherein a guide groove is provided in the first fixed portion, and one end of the winding extends toward the terminal portion so as to pass through the guide groove.

[0310] <20> The stator according to any one of <1> to <19>, wherein a third groove extending in the axial direction is provided on the outer peripheral surface of the yoke, and the third groove and the column portion are fitted together.

[0311] <21> The stator according to any one of <1> to <20>, wherein a plurality of coil units are arranged in an annular shape in the circumferential direction, and each of the plurality of coil units independently has a split core formed by splitting the stator core in the circumferential direction, the coil, and the terminal member.

[0312] <22> The stator according to any one of <1> to <21>, wherein the stator core is made of a powder magnetic core.

[0313] <23> A motor comprising: the stator according to any one of <1> to <22>; and a rotor provided opposite to the inner peripheral surface of the stator.

[0314] 1A Motor 10A Rotor 11 Rotor yoke 12 Shaft 13 Permanent magnet 20A, 20J Stator 30A, 30J Stator core 31 Yoke 31a First end face of yoke 31b Second end face of yoke 31c Outer circumferential surface of yoke 31d Inner circumferential surface of yoke 32 Teeth 40A Coil 41 Winding 41a One end of winding 41b Other end of winding 50A, 50B, 50C, 50D, 50E, 50F, 50G, 50H, 50J Terminal member 51 Pillar portion 52 First fixed portion 52a First protruding portion 52ba, 52bb Second protruding portion 52c First tapered portion 53 Second fixed portion 53a Third protruding portion 53ba, 53bb Fourth protruding portion 53c Second tapered portion 54, 54a, 54b Terminal portion 55 Guide groove 70A, 70B, 70C, 70D, 70E, 70F, 70G, 70H, 70J, 71A Coil unit 80A, 80C, 80D, 80E, 80F, 80G, 80H Split core 81 Split yoke 81a First end face of split yoke 81b Second end face of split yoke 81c Outer circumferential surface of split yoke 81d Inner circumferential surface of split yoke 82 First groove 82a First step portion 82ba, 82bb Second step portion 83 Second groove 83a Third step portion 83ba, 83bb Fourth step portion 84 Third groove 91a First recess 91b Second recess 92a First convex portion 92b Second protrusion 100 Housing AX Axis

Claims

1. a stator core including a circumferentially annular yoke and teeth protruding from an inner peripheral surface of the yoke in a radial direction of the yoke, the stator core being made of a compact of magnetic powder; A coil formed by a winding wound around the teeth; a terminal member including: a pillar portion extending in an axial direction of the stator core; a first fixed portion provided at one end of the pillar portion in the axial direction so as to protrude closer to the inner circumferential surface of the yoke than the pillar portion in the radial direction; a second fixed portion provided at the other end of the pillar portion in the axial direction so as to protrude closer to the inner circumferential surface of the yoke than the pillar portion in the radial direction; and a terminal portion provided on the first fixed portion so as to protrude from the first fixed portion, The yoke has a first end surface and a second end surface opposed to each other in the axial direction, the terminal member sandwiches the yoke in the axial direction such that the pillar portion faces an outer circumferential surface of the yoke in the radial direction, the first fixed portion faces the first end surface of the yoke, and the second fixed portion faces the second end surface of the yoke; The terminal portion protrudes from the first fixed portion toward an opposite side to the second fixed portion in the axial direction, the winding is wound around the teeth so as to fall within a height range between the first end surface and the second end surface of the yoke in the axial direction, A stator, characterized in that one end of the winding is fixed in a wound state to the terminal portion.

2. The stator according to claim 1 , wherein the first end surface of the yoke and the first fixed portion are fitted together.

3. a first groove is provided in the first end surface of the yoke so as to open toward the outer circumferential surface of the yoke in the radial direction; The stator according to claim 2 , wherein the first groove and the first fixing portion are fitted together.

4. The stator according to claim 3 , wherein the first fixing portion protrudes from the first groove in the axial direction.

5. The stator according to claim 3 , wherein the first fixing portion is received within the first groove in the axial direction.

6. a first step portion is provided at a bottom of the first groove along the axial direction such that a dimension of the first groove is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side of the yoke; The first fixing portion has a first protruding portion protruding in the axial direction, 6. The stator according to claim 3, wherein the first step portion and the first protrusion portion are fitted together.

7. a second step portion is provided along a side of the first groove so that a dimension of the first groove in the circumferential direction is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, The first fixing portion has a second protruding portion protruding in the circumferential direction, 6. The stator according to claim 3, wherein the second step portion and the second protrusion portion are fitted together.

8. the first groove has a tapered shape in which a dimension in the circumferential direction becomes smaller from the inner circumferential surface side toward the outer circumferential surface side of the yoke, the first fixed portion has a first tapered portion having a circumferential dimension that decreases from the inner circumferential surface side toward the outer circumferential surface side of the yoke, 6. The stator according to claim 3, wherein the first groove and the first tapered portion are fitted together.

9. a first recess recessed in the axial direction is provided in one of a bottom of the first groove and the first fixing portion, a first protrusion protruding in the axial direction is provided on the other of the bottom of the first groove and the first fixing portion, 6. The stator according to claim 3, wherein the first recess and the first protrusion are fitted together.

10. 6. The stator according to claim 1, wherein the second end surface of the yoke and the second fixed portion are fitted together.

11. a second groove is provided in the second end surface of the yoke so as to open toward the outer circumferential surface of the yoke in the radial direction; The stator according to claim 10 , wherein the second groove and the second fixing portion are fitted together.

12. a third step portion is provided at a bottom of the second groove along the axial direction such that a dimension of the second groove is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side of the yoke, The second fixing portion has a third protruding portion protruding in the axial direction, The stator according to claim 11 , wherein the third step portion and the third protrusion portion are fitted together.

13. a fourth step portion is provided along a side portion of the second groove so that a dimension of the second groove in the circumferential direction is smaller on the outer circumferential surface side of the yoke than on the inner circumferential surface side, The second fixing portion has a fourth protruding portion protruding in the circumferential direction, The stator according to claim 11 , wherein the fourth step portion and the fourth protrusion portion are fitted together.

14. the second groove has a tapered shape in which a dimension in the circumferential direction becomes smaller from the inner circumferential surface side toward the outer circumferential surface side of the yoke, the second fixed portion has a second tapered portion having a circumferential dimension that decreases from the inner circumferential surface side toward the outer circumferential surface side of the yoke, The stator according to claim 11 , wherein the second groove and the second tapered portion are fitted together.

15. a second recess recessed in the axial direction is provided in one of a bottom of the second groove and the second fixing portion, a second protrusion protruding in the axial direction is provided on the other of the bottom of the second groove and the second fixing portion, The stator according to claim 11 , wherein the second recess and the second protrusion are fitted together.

16. a first groove is provided in the first end surface of the yoke so as to open toward the outer circumferential surface of the yoke in the radial direction; The first groove and the first fixing portion are fitted together, a second groove is provided in the second end surface of the yoke so as to open toward the outer circumferential surface of the yoke in the radial direction; The second groove and the second fixing portion are fitted together, The stator according to claim 1 , wherein the first groove and the second groove have different three-dimensional shapes.

17. The stator of claim 16 , wherein the first groove and the second groove have a maximum circumferential dimension different from each other.

18. The stator of claim 17 , wherein a maximum circumferential dimension of the first groove is greater than a maximum circumferential dimension of the second groove.

19. The first fixing portion is provided with a guide groove, 19. The stator according to claim 1, wherein one end of said winding extends toward said terminal portion so as to pass through said guide groove.

20. a third groove extending in the axial direction is provided on the outer circumferential surface of the yoke, 19. The stator according to claim 1, wherein the third groove and the column portion are fitted together.

21. A plurality of coil units are arranged in an annular shape in the circumferential direction, The stator according to any one of claims 1 to 5 and 16 to 18, wherein each of the plurality of coil units independently has a split core formed by dividing the stator core in the circumferential direction, the coil, and the terminal member.

22. The stator according to any one of claims 1 to 5 and 16 to 18, wherein the stator core is made of a powder magnetic core.

23. A stator according to any one of claims 1 to 5 and 16 to 18; a rotor provided opposite to an inner circumferential surface of the stator.