Stator and motor

Abstract

This stator 20A comprises: a stator core 30A that has an annular yoke 31A along the circumferential direction and teeth 32 protruding from the inner peripheral surface of the yoke 31A in the radial direction of the yoke 31A, and is made from a compact of a magnetic powder; coils 40 constituted by windings 41 wound around the teeth 32; and terminal members 50Aa to which the windings 41 are electrically connected. A terminal groove 33A is provided on the end face of the yoke 31A in the axial direction of the stator core 30A, the terminal member 50Aa is secured to the terminal groove 33A in a state with one end 51Aa insulated from the terminal groove 33A via an insulating member 60, and one end 41a of the winding 41 and the one end 51Aa of the terminal member 50Aa are electrically connected so that the connecting location fits inside the terminal groove 33A in the axial direction.

Description

[Technical Field]

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

[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 with slots between them 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-61408 Summary of the Invention [Problem to be solved by the invention]

[0004] The electric motor described in Patent Document 1 uses a bus bar as a wiring substrate for electrical connection inside the electric motor. However, in the electric motor described in Patent Document 1, as shown in Figure 4 of Patent Document 1, the bus bar to which the coil is connected is directly fixed to the stator core with screws and is therefore positioned axially above the stator core, which makes the electric motor significantly thicker in the axial direction.

[0005] The present invention has been made to solve the above problems, and has an object to provide a stator that enables a motor to be made thinner in the axial direction, and a motor having the above stator. [Means for solving the problem]

[0006] The stator of the present invention comprises a stator core having a circumferentially extending annular yoke and teeth protruding radially from the inner surface of the yoke, and being composed of a molded body of magnetic powder; a coil composed of a winding wound around the teeth; and a terminal member to which the winding is electrically connected, wherein a terminal groove is provided on the end face of the yoke in the axial direction of the stator core, one end of the terminal member is fixed to the terminal groove with one end insulated from the terminal groove via an insulating member, and one end of the winding and one end of the terminal member are electrically connected so that the connection point is located within the terminal groove in the axial direction.

[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. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a stator that can realize a reduction in the axial thickness of a motor, and also to provide a motor having the above-mentioned stator. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic perspective view showing an example of a motor according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic perspective view showing the stator in FIG. 1 as an example of the stator according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a schematic perspective view showing the coil unit in FIG. [Figure 4] FIG. 4 is a perspective schematic view showing the divided core in FIG. [Figure 5] FIG. 5 is a schematic cross-sectional view showing the region R1 in FIG. 3 as viewed from the coil side. [Figure 6] FIG. 6 is a schematic perspective view showing the terminal member in FIG. [Figure 7]FIG. 7 is a schematic perspective view showing a coil unit constituting an example of a stator according to the second embodiment of the present invention. [Figure 8] FIG. 8 is an enlarged perspective schematic view of region R2 (excluding the windings) in FIG. [Figure 9] FIG. 9 is a schematic perspective view showing the terminal grooves of the split cores and the vicinity thereof in a coil unit that constitutes an example of a stator according to the third embodiment of the present invention. [Figure 10] FIG. 10 is a schematic perspective view showing a coil unit constituting an example of a stator according to the fourth embodiment of the present invention. [Figure 11] FIG. 11 is a schematic cross-sectional view showing the region R3 in FIG. 10 as viewed from the coil side. [Figure 12] FIG. 12 is a schematic perspective view showing the terminal member in FIG. [Figure 13] FIG. 13 is a perspective schematic diagram showing the region R3 in FIG. 10 as viewed from the opposite side to the coil. [Figure 14] FIG. 14 is a schematic perspective view showing terminal grooves of a split core and their vicinity in a coil unit that constitutes an example of a stator according to the fifth embodiment of the present invention. [Figure 15] FIG. 15 is a schematic perspective view showing an example of a stator according to a sixth embodiment of the present invention. [Figure 16] FIG. 16 is a schematic perspective view showing an example of a stator according to the seventh embodiment of the present invention. [Figure 17] FIG. 17 is a schematic perspective view showing an example of a stator according to an eighth embodiment of the present invention. DETAILED DESCRIPTION OF THE 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 due to 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] [Embodiment 1] A motor of the present invention includes the stator of the present invention and a rotor provided opposite to the inner peripheral surface of the stator.

[0015] FIG. 1 is a schematic perspective view showing an example of a motor according to a first embodiment of the present invention.

[0016] The motor 1 shown in FIG. 1 includes a rotor 10 and a stator 20A.

[0017] In the motor 1, the rotor 10 is positioned coaxially inside the axis AX, and the stator 20A is positioned coaxially outside the axis AX.

[0018] The rotor 10 is disposed opposite the inner peripheral surface of the stator 20A.

[0019] The rotor 10 includes, for example, a rotor yoke 11, a shaft 12, and a permanent magnet 13.

[0020] 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.

[0021] The shaft 12 is inserted through the rotor yoke 11 .

[0022] The shaft 12 may be made of, for example, metal such as stainless steel.

[0023] The permanent magnets 13 are provided along the outer circumferential surface of the rotor yoke 11 so that the north and south poles are arranged alternately.

[0024] When viewed in the direction in which the shaft 12 extends, that is, in the direction in which the axis line AX extends, the rotor 10 may have a substantially circular shape or a substantially polygonal shape.

[0025] The stator of the present invention has a ring-shaped yoke extending circumferentially, and teeth protruding radially from the inner surface of the yoke, and is also equipped with a stator core made of a molded body of magnetic powder, a coil made of windings wound around the teeth, and terminal members to which the windings are electrically connected.

[0026] FIG. 2 is a schematic perspective view showing the stator in FIG. 1 as an example of the stator according to the first embodiment of the present invention.

[0027] The stator 20A shown in FIG. 2 includes a stator core 30A, a plurality of coils 40, and a plurality of terminal members 50A.

[0028] The stator core 30A has a yoke (also called a core back) 31A and a plurality of teeth 32.

[0029] In this specification, the direction in which the axis of the stator core extends is defined as the axial direction. In the example shown in Figures 1 and 2, the axial direction of the stator core 30A is parallel to the direction in which the shaft 12 extends, i.e., the direction in which the axis AX extends. In addition, the direction along the outer peripheral surface of the yoke when 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.

[0030] The yoke 31A is annular and extends in the circumferential direction.

[0031] The teeth 32 are spaced apart from one another in the circumferential direction and protrude independently from the inner peripheral surface of the yoke 31A in the radial direction of the yoke 31A. In this manner, the teeth 32 are integrated with the yoke 31A.

[0032] The stator core 30A is made of a compact of magnetic powder. That is, the yoke 31A and the teeth 32 of the stator core 30A are integrally made of a compact of magnetic powder.

[0033] In the stator of the present invention, the stator core is preferably made of a powder magnetic core.

[0034] The stator core 30A is preferably made of a powder magnetic core, that is, the yoke 31A and the teeth 32 of the stator core 30A are preferably integrally made of a powder magnetic core.

[0035] 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.

[0036] Each of the plurality of coils 40 is formed by a winding 41 wound around a tooth 32. The plurality of coils 40 are independently provided on the tooth 32 so as to be spaced apart from each other in the circumferential direction.

[0037] Each of the multiple coils 40 is insulated from the teeth 32 via, for example, an insulating member 60 described later.

[0038] For example, in the case of a three-phase motor, the multiple coils 40 include a coil configured as a U-phase winding, a coil configured as a V-phase winding, and a coil configured as 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.

[0039] The winding wire 41 may be, for example, polyurethane copper wire (UEW).

[0040] The plurality of terminal members 50A are electrically connected to the windings 41, respectively.

[0041] Although not shown in FIG. 2, the plurality of terminal members 50A are connected to one another so that the plurality of coils 40 form the above-described wire connections.

[0042] Examples of materials that can be used to form the terminal member 50A include metals such as copper.

[0043] 2, the terminal member 50A includes two types of terminal members 50Aa and 50Ab that are symmetrical in shape. The terminal members 50Aa and 50Ab are alternately arranged so as to be spaced apart from each other in the circumferential direction. Each of the terminal members 50Aa and 50Ab forms a pair, and is electrically connected to the winding 41 that constitutes one coil 40.

[0044] The terminal members 50A may include only one type of terminal member having the same shape, or may include three or more types of terminal members having different shapes.

[0045] In the following description, when there is no need to distinguish between the terminal members 50Aa and 50Ab, they will simply be referred to as the terminal members 50A.

[0046] In the stator of the present invention, a terminal groove is provided on an end surface of the yoke in the axial direction of the stator core.

[0047] A plurality of terminal grooves 33A are provided in an end face of the yoke 31A in the axial direction of the stator core 30A. More specifically, the yoke 31A has, as end faces in the axial direction, end faces 31Aa and 31Ab that face each other in the axial direction, and the plurality of terminal grooves 33A are provided in end face 31Aa of the yoke 31A.

[0048] The terminal grooves 33A may be provided on the end surface 31Ab of the yoke 31A.

[0049] As described above, it is preferable that the plurality of terminal grooves 33A be provided on one end face (end face 31Aa or end face 31Ab) of the yoke 31A in the axial direction.

[0050] Alternatively, some of the multiple terminal grooves 33A may be provided on end face 31Aa of yoke 31A, and the rest may be provided on end face 31Ab of yoke 31A. In this manner, some of the multiple terminal grooves 33A may be provided on one axial end face of yoke 31A, and the rest may be provided on the other axial end face of yoke 31A.

[0051] In the stator core 30A, when viewed from the radial direction, the entire terminal groove 33A is exposed to the inner circumferential surface of the yoke 31A.

[0052] In addition, in the stator core 30A, when viewed from the radial direction, the entire terminal groove 33A is exposed on the outer peripheral surface of the yoke 31A.

[0053] In the stator of the present invention, the terminal member is fixed in the terminal groove with one end insulated from the terminal groove via an insulating member.

[0054] One end of the terminal member 50A is fixed to the terminal groove 33A in a state insulated from the terminal groove 33A via an insulating member 60.

[0055] 2, an insulating member 60 is provided on the surface of the terminal groove 33A. One end 51Aa of the terminal member 50Aa is fixed to the terminal groove 33A while being insulated from the terminal groove 33A via the insulating member 60. Also, one end 51Ab of the terminal member 50Ab is fixed to the terminal groove 33A while being insulated from the terminal groove 33A via the insulating member 60.

[0056] 2, the insulating member 60 is an insulating film formed by applying an insulating material to the surface of the terminal groove 33A. That is, in the example shown in FIG. 2, the surface of the terminal groove 33A is covered with the insulating film serving as the insulating member 60. Note that the surface of the terminal groove 33A may not be covered with an insulating film, and the surface of one end of the terminal member 50A facing the terminal groove 33A may be covered with an insulating film. Alternatively, the surface of the terminal groove 33A and the surface of one end of the terminal member 50A facing the terminal groove 33A may each be covered with an insulating film.

[0057] As described above, at least one of the surface of the terminal groove 33A and the surface of one end of the terminal member 50A on the terminal groove 33A side may be covered with an insulating film serving as the insulating member 60.

[0058] When the surface of terminal groove 33A is covered with an insulating film serving as insulating member 60, it is preferable that the entire surface of stator core 30A be covered with the insulating film, as shown in Fig. 2. That is, it is preferable that the entire surfaces of yoke 31A and teeth 32 of stator core 30A be covered with the insulating film, as shown in Fig. 2. However, it is sufficient that the insulating film covers at least the portions of the surfaces of yoke 31A and teeth 32 of stator core 30A that come into contact with terminal member 50A and winding 41, and it is not necessary that the insulating film cover the entire surfaces.

[0059] Examples of a method for coating the surfaces of objects such as the stator core 30A and the terminal members 50A with an insulating film include a coating method such as electrodeposition coating.

[0060] The insulating member 60 may be an insulating sheet formed in advance from an insulating material, rather than an insulating film formed by applying an insulating material to the surface of an object such as the terminal groove 33A or the terminal member 50A. When the insulating member 60 is an insulating sheet, the insulating sheet is disposed at least between the terminal groove 33A and one end of the terminal member 50A, more specifically, between the surface of the terminal groove 33A and the surface of one end of the terminal member 50A facing the terminal groove 33A.

[0061] The thickness of the insulating member 60 is preferably 200 μm or less, and more preferably 10 μm or more.

[0062] Methods for fixing one end of the terminal member 50A to the terminal groove 33A include, for example, joining one end of the terminal member 50A to the terminal groove 33A with a bonding material such as an adhesive, or fitting one end of the terminal member 50A into the terminal groove 33A.

[0063] In the stator of the present invention, the other end of the terminal member may face outward from the yoke.

[0064] 2, the other end of terminal member 50A faces outward from yoke 31A. More specifically, the other end 52Aa of terminal member 50Aa faces outward from yoke 31A. Moreover, the other end 52Ab of terminal member 50Ab faces outward from yoke 31A.

[0065] Since the other end of the terminal member 50A faces outward from the yoke 31A, it is easier to connect the other end of the terminal member 50A to a wiring board, bus bar, etc. (not shown) for connecting the terminal members 50A to each other, compared to when the other end of the terminal member 50A does not face outward from the yoke 31A.

[0066] In the stator of the present invention, the other end of the terminal member may face outward from the yoke in the radial direction.

[0067] In the stator 20A shown in FIG. 2, the other end of the terminal member 50A faces outward from the yoke 31A in the radial direction.

[0068] More specifically, the other end 52Aa of the terminal member 50Aa faces radially outward from the yoke 31A, i.e., does not overlap with the yoke 31A when viewed in the axial direction.

[0069] Meanwhile, the other end 52Aa of the terminal member 50Aa overlaps with the terminal groove 33A when viewed from the radial direction. However, the other end 52Aa of the terminal member 50Aa does not have to overlap with the terminal groove 33A when viewed from the radial direction.

[0070] The other end 52Ab of the terminal member 50Ab faces radially outward from the yoke 31A, that is, the other end 52Ab of the terminal member 50Ab does not overlap with the yoke 31A when viewed in the axial direction.

[0071] On the other hand, the other end 52Ab of the terminal member 50Ab overlaps with the terminal groove 33A when viewed from the radial direction. Note that the other end 52Ab of the terminal member 50Ab does not necessarily overlap with the terminal groove 33A when viewed from the radial direction.

[0072] In the stator of the present invention, one end of the winding and one end of the terminal member are electrically connected so that the connection point is housed inside the terminal groove in the axial direction.

[0073] In the following, a stator having a plurality of coil units arranged in a ring shape will be taken as an example of a stator of the present invention, and the manner of connection between one end of the winding and one end of the terminal member in each coil unit will be described.

[0074] The stator of the present invention may have a plurality of coil units arranged in a ring shape, and each of the plurality of coil units may independently have a split core formed by dividing the stator core in the circumferential direction, the coil, and the terminal member.

[0075] The stator 20A shown in FIG. 2 is formed by arranging a plurality of coil units 70A in an annular shape.

[0076] FIG. 3 is a schematic perspective view showing the coil unit in FIG.

[0077] The coil unit 70A shown in FIG. 3 includes a split core 80A, a coil 40, and terminal members 50Aa and 50Ab.

[0078] 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.

[0079] FIG. 4 is a perspective schematic view showing the divided core in FIG.

[0080] The split core 80A shown in FIG. 4 has a split yoke 81A and teeth 32.

[0081] The split yoke 81A is formed by splitting the yoke 31A in the circumferential direction.

[0082] The teeth 32 protrude in the radial direction from the inner peripheral surface of the split yoke 81 A. In this manner, the teeth 32 are integrated with the split yoke 81 A.

[0083] The split core 80A is made of a compact of magnetic powder. That is, the split yoke 81A and the teeth 32 of the split core 80A are integrally made of a compact of magnetic powder.

[0084] 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 81A along the circumferential direction, may be, for example, curved, linear, or a shape that combines curved and linear shapes. An embodiment in which split yokes 81A whose outer peripheries when viewed from the axial direction have the above-described shapes are arranged in the circumferential direction is included in the embodiment in which the yoke 31A is annular and along the circumferential direction.

[0085] In the split core 80A, it is preferable that the teeth 32 are thinner in at least one of the axial and circumferential directions on the split yoke 81A side than on the opposite side of the split yoke 81A. In the example shown in Fig. 4, the teeth 32 are thinner in the circumferential direction on the split yoke 81A side than on the opposite side of the split yoke 81A.

[0086] That is, in the stator core 30A formed by arranging a plurality of split cores 80A in an annular shape, the teeth 32 are preferably thinner on the yoke 31A side than on the opposite side to the yoke 31A in at least one of the axial and circumferential directions.

[0087] If the yoke 31A side of the teeth 32 (the split yoke 81A side) is thinner than the opposite side of the yoke 31A (the opposite side of the split yoke 81A), the number of turns of the coil 40 can be increased by using the thinner portion as the winding axis of the coil 40. As a result, in the motor 1 incorporating the stator 20A, the magnetic flux penetrating the coil 40 tends to increase, and the output torque of the motor 1 tends to improve.

[0088] In the coil unit 70A shown in FIG. 3, the coils 40 are provided on the teeth 32 of the split core 80A.

[0089] In the split core 80A shown in FIGS. 3 and 4, two terminal grooves 33A are provided on an end surface 81Aa of the split yoke 81A in the axial direction.

[0090] In the split core 80A, when viewed from the radial direction, the entire terminal groove 33A is exposed on the inner peripheral surface of the split yoke 81A.

[0091] In addition, in the split core 80A, the entire terminal groove 33A is exposed on the outer circumferential surface of the split yoke 81A when viewed from the radial direction.

[0092] 3, one end 51Aa of a terminal member 50Aa is fixed to one of two terminal grooves 33A in an insulated state via an insulating member 60. One end 51Ab of a terminal member 50Ab is fixed to the other of the two terminal grooves 33A in an insulated state via an insulating member 60.

[0093] 3, the terminal member 50Aa is longer in the radial direction than the terminal groove 33A. The other end 52Aa of the terminal member 50Aa faces outward from the split yoke 81A, more specifically, faces outward from the split yoke 81A in the radial direction.

[0094] 3, the terminal member 50Aa may be shorter in the radial direction than the terminal groove 33A. In this case, it is preferable that the entire terminal member 50Aa is fixed to the terminal groove 33A in a state insulated from the terminal groove 33A via the insulating member 60.

[0095] 3, the terminal member 50Ab is longer in the radial direction than the terminal groove 33A. The other end 52Ab of the terminal member 50Ab faces outward from the split yoke 81A, more specifically, faces outward from the split yoke 81A in the radial direction.

[0096] 3, the terminal member 50Ab may be shorter in the radial direction than the terminal groove 33A. In this case, it is preferable that the entire terminal member 50Ab is fixed to the terminal groove 33A in a state insulated from the terminal groove 33A via the insulating member 60.

[0097] In the coil unit 70A shown in FIG. 3, one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa are electrically connected.

[0098] As described above, one end 51Aa of the terminal member 50Aa is fixed in the terminal groove 33A, and one end 41a of the winding 41 is electrically connected to one end 51Aa of the terminal member 50Aa, so that one end 41a of the winding 41 can be fixed in the terminal groove 33A via one end 51Aa of the terminal member 50Aa. This allows one end 41a of the flexible winding 41 to be converted into a strong terminal member 50Aa fixed in the terminal groove 33A, forming a structure for drawing the coil 40 to the outside. Therefore, when arranging multiple coil units 70A in a ring to fabricate the stator 20A, or when fabricating the motor 1 using the stator 20A, it becomes easier to work without damaging one end 41a of the winding 41, which ultimately leads to improved reliability of the motor 1.

[0099] Fig. 5 is a cross-sectional view showing a state in which the region R1 in Fig. 3 is viewed from the coil side. Note that Fig. 5 does not show the insulating member 60.

[0100] 5, one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa are electrically connected so that the connection point is accommodated within the terminal groove 33A in the axial direction. In other words, the connection point between one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa is accommodated within the terminal groove 33A in the axial direction.

[0101] In the example shown in FIG. 5, one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa are directly connected, and the connection point is accommodated inside the terminal groove 33A in the axial direction.

[0102] The one end 41a of the winding 41 and the one end 51Aa of the terminal member 50Aa may be electrically connected via a conductive member such as solder. In this case, the connection point between the one end 41a of the winding 41 and the one end 51Aa of the terminal member 50Aa corresponds to the arrangement region of the conductive member.

[0103] Since the coil unit 70A has the above-described configuration, in the stator 20A in which multiple coil units 70A are arranged in a ring shape, one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa are electrically connected so that the connection point is located inside the terminal groove 33A in the axial direction.

[0104] In the stator 20A, the connection between one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa is accommodated inside the terminal groove 33A in the axial direction, so that the connection between one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa does not protrude axially beyond the highest point of the yoke 31A, thereby enabling the motor 1 to be made thinner in the axial direction.

[0105] From the viewpoint of reducing the thickness of the motor 1 in the axial direction, it is preferable that one end 41a of the winding 41 is accommodated inside the terminal groove 33A in the axial direction, as shown in FIG.

[0106] From the same viewpoint, it is preferable that one end portion 51Aa of the terminal member 50Aa is accommodated inside the terminal groove 33A in the axial direction, as shown in FIG.

[0107] In this way, it is preferable that at least one of the one end 41a of the winding 41 and the one end 51Aa of the terminal member 50Aa is accommodated inside the terminal groove 33A in the axial direction. Furthermore, it is particularly preferable that both the one end 41a of the winding 41 and the one end 51Aa of the terminal member 50Aa are accommodated inside the terminal groove 33A in the axial direction, as shown in Fig. 5 .

[0108] In the stator 20A, the terminal groove 33A, which accommodates the connection between one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa, is formed simultaneously when the stator core 30A, or in this case, the split core 80A, is formed. Therefore, when the stator 20A is fabricated, there is no need to perform an additional step, such as partially removing the axial end face of the formed stator core 30A to provide the terminal groove 33A. Therefore, when fabricating the stator 20A, damage to the stator core 30A, or in this case, the split core 80A, is suppressed when providing the terminal groove 33A. As a result, a decrease in the strength of the stator core 30A, or in this case, the split core 80A, is suppressed.

[0109] In contrast, in the electric motor described in Patent Document 1, it is necessary to form threaded holes in the stator core in order to screw the bus bars, to which the coils are connected, to the stator core. However, particularly when 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. Even if it were possible to form threaded holes in the stator core, the stator core would be damaged when the threaded holes were formed, thereby reducing the strength of the resulting stator core.

[0110] In the stator of the present invention, the bottom surface of the terminal groove may be curved.

[0111] The bottom surface of the terminal groove 33A shown in Fig. 5 is curved. The terminal groove 33A with a curved bottom surface as shown in Fig. 5 is easier to form than the terminal groove 33B with a flat bottom surface as shown in Fig. 11, which will be described later. This difference in ease of forming tends to be particularly noticeable when the stator core 30A, in this case, the split core 80A, is made of a powder magnetic core.

[0112] In the stator of the present invention, when the bottom surface of the terminal groove is curved, it is preferable that one end of the terminal member has a curved first portion that follows the bottom surface of the terminal groove and a second portion that extends from one end of the first portion, and it is preferable that one end of the winding is fixed inside the terminal groove by being sandwiched between the first portion and the second portion of the terminal member.

[0113] FIG. 6 is a schematic perspective view showing the terminal member in FIG.

[0114] One end portion 51Aa of a terminal member 50Aa shown in FIGS. 5 and 6 has a first portion 53Aa and a second portion 54Aa.

[0115] The first portion 53Aa of the terminal member 50Aa is curved along the bottom surface of the terminal groove 33A.

[0116] The second portion 54Aa of the terminal member 50Aa extends from one end of the first portion 53Aa.

[0117] 5 and 6, the second portion 54Aa of the terminal member 50Aa is curved. However, the second portion 54Aa of the terminal member 50Aa may also be flat.

[0118] 5, one end 41a of the winding 41 is sandwiched and fixed between the first portion 53Aa and the second portion 54Aa of the terminal member 50Aa inside the terminal groove 33A. This easily realizes a configuration in which the one end 41a of the winding 41 and the one end 51Aa of the terminal member 50Aa are electrically connected, with the connection point being contained within the terminal groove 33A in the axial direction. Furthermore, when attempting to electrically connect the one end 41a of the winding 41 and the one end 51Aa of the terminal member 50Aa via a conductive member such as solder, the one end 41a of the winding 41 can be temporarily fixed by being sandwiched between the first portion 53Aa and the second portion 54Aa of the terminal member 50Aa.

[0119] In the stator of the present invention, it is preferable that the one end of the terminal member further has a linear third portion extending in the axial direction from the other end of the first portion.

[0120] One end portion 51Aa of the terminal member 50Aa shown in FIGS. 5 and 6 further includes a third portion 55Aa.

[0121] The third portion 55Aa of the terminal member 50Aa is linear and extends axially from the other end of the first portion 53Aa.

[0122] The terminal member 50Aa further includes the third portion 55Aa, which prevents the terminal member 50Aa from rotating along the bottom surface of the terminal groove 33A when fixing the one end 41a of the winding 41 to the one end 51Aa of the terminal member 50Aa, thereby improving the efficiency of fixing the one end 41a of the winding 41 to the one end 51Aa of the terminal member 50Aa.

[0123] In the coil unit 70A shown in Figure 3, similar to the connection between one end 41a of the winding 41 and one end 51Aa of the terminal member 50Aa described above, it is preferable that the other end 41b of the winding 41 and one end 51Ab of the terminal member 50Ab are electrically connected so that the connection point is located inside the terminal groove 33A in the axial direction.

[0124] The preferred embodiment of the other end 41b of the winding 41 is the same as the preferred embodiment of the one end 41a of the winding 41 described above.

[0125] The preferred aspects of the one end 51Ab of the terminal member 50Ab are the same as the preferred aspects of the one end 51Aa of the terminal member 50Aa described above.

[0126] 2, the winding 41 and the terminal member 50A are electrically connected at multiple connection points, and it is preferable that all of the connection points are located inside the terminal groove 33A in the axial direction. Note that, in the stator 20A, as long as at least one of the multiple connection points between the winding 41 and the terminal member 50A is located inside the terminal groove 33A in the axial direction, there may be connection points that are not located inside the terminal groove 33A in the axial direction.

[0127] [Embodiment 2] In the stator of the present invention, it is preferable that a first groove be further provided in the end face of the yoke in the axial direction, the first groove passing through between the inner peripheral surface of the yoke and the terminal groove in the radial direction so as to be narrower than the terminal groove in the circumferential direction, and insulated from the winding via the insulating member. A stator different from the stator of embodiment 1 of the present invention in this respect will be described below as a stator of embodiment 2 of the present invention.

[0128] Fig. 7 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 2 of the present invention, and Fig. 8 is a schematic perspective view showing an enlarged view of region R2 (excluding windings) in Fig. 7.

[0129] The coil unit 70B shown in FIG. 7 includes a split core 80B, a coil 40, a terminal member 50Aa, and a terminal member 50Ab.

[0130] The split core 80B has a split yoke 81B and teeth 32.

[0131] In the split core 80B shown in FIG. 7, two first grooves 34 are provided in the end surface 81Ba of the split yoke 81B in the axial direction, corresponding to the two terminal grooves 33A.

[0132] 7 and 8, the first groove 34 penetrates radially between the inner peripheral surface of the split yoke 81B and the terminal groove 33A so as to be narrower in the circumferential direction than the terminal groove 33A. In other words, in the split core 80B, the entire terminal groove 33A is not exposed to the inner peripheral surface of the split yoke 81B when viewed radially.

[0133] The first grooves 34 are insulated from the winding 41 via an insulating member 60. More specifically, one of the two first grooves 34 is insulated from one end 41a of the winding 41 via the insulating member 60. The other of the two first grooves 34 is insulated from the other end 41b of the winding 41 via the insulating member 60.

[0134] In the coil unit 70B, when the first groove 34 is provided in the end surface 81Ba of the split yoke 81B in the axial direction, one end 41a of the winding 41 can be electrically connected to one end 51Aa of the terminal member 50Aa by passing it through the first groove 34. Furthermore, when attempting to clamp and fix one end 41a of the winding 41 between one end 51Aa of the terminal member 50Aa, one end 41a of the winding 41 can be temporarily fixed by hooking it into the first groove 34.

[0135] The other end 41b of the winding 41 can be electrically connected to the one end 51Ab of the terminal member 50Ab by passing it through the first groove 34. Furthermore, when attempting to fix the other end 41b of the winding 41 by sandwiching it between the one end 51Ab of the terminal member 50Ab, the other end 41b of the winding 41 can be temporarily fixed by hooking it into the first groove 34.

[0136] In coil unit 70B, when first groove 34 is provided in end surface 81Ba of split yoke 81B in the axial direction, partition wall 82 is present in split yoke 81B, positioned around first groove 34 and separating the inner peripheral surface of split yoke 81B from terminal groove 33A. The presence of partition wall 82 makes it easier to ensure insulation between the main body of coil 40, excluding the end of winding 41, and terminal member 50A.

[0137] Since the coil unit 70B has the above-described configuration, in a stator in which multiple coil units 70B are arranged in a ring shape, in addition to the terminal groove 33A, the end face of the yoke 31A in the axial direction is further provided with a first groove 34 that penetrates radially between the inner surface of the yoke 31A and the terminal groove 33A so as to be narrower than the terminal groove 33A in the circumferential direction, and is insulated from the winding 41 via an insulating member 60.

[0138] The motor of the second embodiment of the present invention is similar to the motor of the first embodiment of the present invention, except that it has the stator of the second embodiment of the present invention.

[0139] [Embodiment 3] In the stator of the present invention, it is preferable that a recess is provided on the bottom surface of the terminal groove. A stator that differs from the stator of embodiment 1 of the present invention in this respect will be described below as a stator of embodiment 3 of the present invention.

[0140] FIG. 9 is a schematic perspective view showing the terminal grooves of the split cores and the vicinity thereof in a coil unit that constitutes an example of a stator according to the third embodiment of the present invention.

[0141] In a split core 80C of a coil unit 70C (coils and terminal members are not shown) shown in FIG. 9, a terminal groove 33A is provided on an end surface 81Ca of a split yoke 81C in the axial direction.

[0142] In a split core 80C shown in FIG. 9, a groove 83 is provided as a recess in the bottom surface of the terminal groove 33A.

[0143] By providing groove 83 on the bottom surface of terminal groove 33A, when one end of terminal member 50A is to be joined to terminal groove 33A with a joining material such as adhesive, groove 83 can be used as a filling place for the joining material, thereby improving the work efficiency of joining one end of terminal member 50A to terminal groove 33A.

[0144] Furthermore, groove 83 is provided on the bottom surface of terminal groove 33A, making it difficult for heat to be transferred from terminal member 50A fixed in terminal groove 33A to split yoke 81C. This makes soldering easier when attempting to solder winding 41 and terminal member 50A, and also prevents split yoke 81C from being damaged by heat during soldering.

[0145] The planar shape of the groove 83 is not limited to the shape extending in the circumferential and radial directions as shown in FIG. 9, and may be other shapes.

[0146] Coil unit 70C has the above-described configuration, so that in a stator in which a plurality of coil units 70C are arranged in an annular shape, groove 83 is provided as a recess in the bottom surface of terminal groove 33A.

[0147] In this embodiment, a groove is shown as an example of the depression provided in the bottom surface of the terminal groove, but it may also be a hole as shown in the later-described embodiment 5. Alternatively, in this embodiment, the depression provided in the bottom surface of the terminal groove may include both a groove and a hole.

[0148] In this embodiment, an example in which a recess is provided on the bottom surface of the terminal groove in comparison with the first embodiment has been shown, but a recess may be provided on the bottom surface of the terminal groove in comparison with the second embodiment.

[0149] The motor of the third embodiment of the present invention is similar to the motor of the first embodiment of the present invention, except that it has the stator of the third embodiment of the present invention.

[0150] [Embodiment 4] In the stator of the present invention, the bottom surface of the terminal groove may be flat. In this case, in the stator of the present invention, it is preferable that the terminal member has at least one flat portion. A stator that differs from the stator of embodiment 1 of the present invention in this respect will be described below as a stator of embodiment 4 of the present invention.

[0151] FIG. 10 is a schematic perspective view showing a coil unit constituting an example of a stator according to the fourth embodiment of the present invention.

[0152] A coil unit 70D shown in FIG. 10 includes a split core 80D, a coil 40, a terminal member 50Ba, and a terminal member 50Bb.

[0153] The split core 80D has a split yoke 81D and teeth 32.

[0154] Two terminal grooves 33B are provided on an end surface 81Da of the split yoke 81D in the axial direction.

[0155] One end 51Ba of the terminal member 50Ba is fixed to one of the two terminal grooves 33B in an insulated state via the insulating member 60. One end 51Bb of the terminal member 50Bb is fixed to the other of the two terminal grooves 33B in an insulated state via the insulating member 60.

[0156] The other end 52Ba of the terminal member 50Ba faces outward from the split yoke 81D, more specifically, faces outward from the split yoke 81D in the radial direction. The other end 52Bb of the terminal member 50Bb faces outward from the split yoke 81D, more specifically, faces outward from the split yoke 81D in the radial direction.

[0157] In the following description, when there is no need to distinguish between the terminal members 50Ba and 50Bb, they will simply be referred to as the terminal members 50B.

[0158] Fig. 11 is a schematic cross-sectional view showing the region R3 in Fig. 10 as viewed from the coil side. Note that Fig. 11 does not show the insulating member 60.

[0159] 11, one end 41a of the winding 41 and one end 51Ba of the terminal member 50Ba are electrically connected so that the connection point is accommodated within the terminal groove 33B in the axial direction. In other words, the connection point between one end 41a of the winding 41 and one end 51Ba of the terminal member 50Ba is accommodated within the terminal groove 33B in the axial direction.

[0160] The bottom surface of the terminal groove 33B shown in Fig. 11 is flat. More specifically, the bottom surface of the terminal groove 33B to which the one end portion 51Ba of the terminal member 50Ba is fixed is flat.

[0161] FIG. 12 is a schematic perspective view showing the terminal member in FIG.

[0162] The terminal member 50Ba shown in Fig. 12 has at least one flat portion. In the example shown in Fig. 12, the terminal member 50Ba is composed only of a flat portion. For example, as shown in Fig. 11, one end portion 51Ba of the terminal member 50Ba is flat and conforms to the bottom surface of the terminal groove 33B. The terminal member 50Ba having a flat portion as shown in Fig. 12 can be fabricated with easier sheet metal processing than the terminal member 50Aa as shown in Fig. 6, which is mainly curved.

[0163] In the stator of the present invention, it is preferable that a second groove is provided on the outer peripheral surface of the yoke, extending from the terminal groove in the axial direction and insulated from the terminal member via the insulating member, and that the terminal member is folded back so that a portion of its other end is positioned inside the second groove.

[0164] FIG. 13 is a perspective schematic diagram showing the region R3 in FIG. 10 as viewed from the opposite side to the coil.

[0165] A second groove 35 is provided on the outer peripheral surface of the split yoke 81D shown in FIG.

[0166] The second groove 35 extends axially (axially downward in FIG. 13) from the terminal groove 33B.

[0167] The second groove 35 is insulated from the terminal member 50Ba via the insulating member 60.

[0168] In the example shown in FIG. 13, an insulating member 60 is provided on the surface of the second groove 35.

[0169] 13, the insulating member 60 is an insulating film formed by applying an insulating material to the surface of the second groove 35. That is, in the example shown in FIG. 13, the surface of the second groove 35 is covered with the insulating film serving as the insulating member 60. Note that the surface of the second groove 35 may not be covered with an insulating film, and the surface of the terminal member 50Ba facing the second groove 35 may be covered with an insulating film. Alternatively, the surface of the second groove 35 and the surface of the terminal member 50Ba facing the second groove 35 may each be covered with an insulating film.

[0170] As described above, at least one of the surface of the second groove 35 and the surface of the terminal member 50Ba on the second groove 35 side may be covered with an insulating film serving as the insulating member 60.

[0171] 13, it is preferable that the terminal member 50Ba is folded back so that a portion of the other end 52Ba is positioned inside the second groove 35. In this case, the portion of the terminal member 50Ba on the other end 52Ba fits into the second groove 35, making it easier to position the terminal member 50Ba.

[0172] Since coil unit 70D has the above-described configuration, in a stator in which multiple coil units 70D are arranged in an annular shape, terminal groove 33B has a flat bottom surface, and terminal member 50Ba has at least one flat portion. Also, in a stator in which multiple coil units 70D are arranged in an annular shape, second groove 35 is preferably provided on the outer peripheral surface of yoke 31A, extending axially from terminal groove 33B and insulated from terminal member 50Ba via insulating member 60, and terminal member 50Ba is folded back so that a portion of the other end 52Ba side is located inside second groove 35.

[0173] In the coil unit 70D shown in Figure 10, similar to the connection mode between one end 41a of the winding 41 and one end 51Ba of the terminal member 50Ba described above, it is preferable that the other end 41b of the winding 41 and one end 51Bb of the terminal member 50Bb are electrically connected so that the connection point is located inside the terminal groove 33B in the axial direction.

[0174] 10, the terminal groove 33B to which one end 51Bb of the terminal member 50Bb is fixed is preferably flat, similar to the terminal groove 33B to which one end 51Ba of the terminal member 50Ba is fixed. Also, similar to the terminal member 50Ba, the terminal member 50Bb preferably has at least one flat portion.

[0175] 10, a second groove is preferably provided on the outer peripheral surface of the split yoke 81D, the second groove extending in the axial direction from the terminal groove 33B to which one end 51Bb of the terminal member 50Bb is fixed, and insulated from the terminal member 50Bb via the insulating member 60. Furthermore, the terminal member 50Bb is preferably folded back so that a portion of the other end 52Bb side is positioned inside the second groove.

[0176] The motor of the fourth embodiment of the present invention is similar to the motor of the first embodiment of the present invention, except that it has the stator of the fourth embodiment of the present invention.

[0177] [Embodiment 5] In the stator of the present invention, it is preferable that a recess is provided on the bottom surface of the terminal groove. A stator that differs from the stator of embodiment 4 of the present invention in this respect will be described below as a stator of embodiment 5 of the present invention.

[0178] FIG. 14 is a schematic perspective view showing terminal grooves of a split core and their vicinity in a coil unit that constitutes an example of a stator according to the fifth embodiment of the present invention.

[0179] In a split core 80E of a coil unit 70E (coils and terminal members are not shown) shown in FIG. 14, a terminal groove 33B is provided on an end surface 81Ea of a split yoke 81E in the axial direction.

[0180] In a split core 80E shown in FIG. 14, a hole 84 is provided as a recess in the bottom surface of the terminal groove 33B.

[0181] By providing a hole 84 on the bottom surface of the terminal groove 33B, when joining one end of the terminal member 50B to the terminal groove 33B with a joining material such as an adhesive, the hole 84 can be used as a place to fill the joining material, thereby improving the work efficiency of joining one end of the terminal member 50B to the terminal groove 33B.

[0182] Furthermore, the holes 84 provided in the bottom surfaces of the terminal grooves 33B make it difficult for heat to be transferred from the terminal members 50B fixed in the terminal grooves 33B to the split yokes 81E. This makes soldering easier when soldering the windings 41 to the terminal members 50B, and also prevents damage to the split yokes 81E caused by the heat generated during soldering.

[0183] The planar shape of the hole 84 is not limited to the rectangular shape shown in FIG. 14, but may be other shapes.

[0184] The number of holes 84 is not limited to three as shown in FIG. 14, but may be only one, two, or four or more.

[0185] When there are a plurality of holes 84 (particularly, three or more), these holes 84 may be aligned in one direction (in the radial direction in FIG. 14) as shown in FIG. 14, or may not be aligned in one direction.

[0186] When there are a plurality of holes 84, the intervals between these holes 84 may be the same as each other, may be different from each other, or may be partially different.

[0187] Since coil unit 70E has the above-described configuration, in a stator in which a plurality of coil units 70E are arranged in an annular shape, holes 84 are provided as recesses in the bottom surfaces of terminal grooves 33B.

[0188] In this embodiment, a hole is shown as an example of a depression provided in the bottom surface of the terminal groove, but it may also be a groove as shown in the above-mentioned embodiment 3. Alternatively, in this embodiment, the depression provided in the bottom surface of the terminal groove may include both a hole and a groove.

[0189] The motor of the fifth embodiment of the present invention is similar to the motor of the first embodiment of the present invention, except that it has the stator of the fifth embodiment of the present invention.

[0190] [Embodiment 6] In the stator of the present invention, the other end of the terminal member may face outward from the yoke in the axial direction. A stator that differs from the stator of the first embodiment of the present invention in this respect will be described below as a stator of the sixth embodiment of the present invention.

[0191] FIG. 15 is a schematic perspective view showing an example of a stator according to a sixth embodiment of the present invention.

[0192] 15, the other end of the terminal member 50A faces outward from the yoke 31A in the axial direction. That is, the other end of the terminal member 50A does not overlap with the yoke 31A when viewed in the radial direction.

[0193] If the other end of terminal member 50A faces outward from yoke 31A in the axial direction, stator 20B appears to be thicker in the axial direction. However, for example, if a motor is constructed by using a wiring board (not shown) for connecting terminal members 50A, the wiring board has terminals on its outer peripheral surface that are provided to face terminal members 50A and has an axial dimension that is not significantly different from the dimension of terminal members 50A protruding in the axial direction from yoke 31A, and is disposed on the terminal member 50A side of stator 20B, the terminal members 50A and the terminals of the wiring board can be efficiently and directly connected, and further, the axial thickness of the motor can be minimized.

[0194] 15, the other end of the terminal member 50A overlaps with the yoke 31A when viewed in the axial direction. However, the other end of the terminal member 50A does not have to overlap with the yoke 31A when viewed in the axial direction.

[0195] In this embodiment, an example is shown in which the other end of the terminal member faces outward from the yoke in the axial direction, as opposed to embodiment 1, but the other end of the terminal member may also face outward from the yoke in the axial direction, as opposed to embodiments 2 to 5.

[0196] The motor of the sixth embodiment of the present invention is similar to the motor of the first embodiment of the present invention, except that it has the stator of the sixth embodiment of the present invention.

[0197] [Embodiment 7] In the stator of the present invention, the stator core may have an integral structure that is not divided into the divided cores, instead of a split structure that is divided into the divided cores. A stator having a configuration different from the stator of the first embodiment of the present invention in this respect will be described below as a stator of the seventh embodiment of the present invention.

[0198] FIG. 16 is a schematic perspective view showing an example of a stator according to the seventh embodiment of the present invention.

[0199] In the stator 20C shown in Fig. 16, the stator core 30B is not divided into split cores, unlike the stator core 30A shown in Fig. 2 and Fig. 15. In other words, the yoke 31B of the stator core 30B is not divided into split yokes, unlike the yoke 31A shown in Fig. 2 and Fig. 15.

[0200] Comparing the stator 20A shown in Fig. 2 with the stator 20C shown in Fig. 16, the stator 20A shown in Fig. 2 has a greater number of coils 40. This is because, when the stator 20A is manufactured, a plurality of coil units 70A, each having a coil 40, are arranged in a ring shape, which results in the coils 40 being arranged more densely. In this way, the coils 40 are arranged more densely in the stator 20A than in the stator 20C, making it easier to improve the motor characteristics.

[0201] Similarly, in the stator 20B shown in FIG. 15, the coils 40 are arranged more densely than in the stator 20C, which makes it easier to improve the motor characteristics.

[0202] The motor of the seventh embodiment of the present invention is similar to the motor of the first embodiment of the present invention, except that it has the stator of the seventh embodiment of the present invention.

[0203] [Embodiment 8] A stator according to an eighth embodiment of the present invention will be described below, which differs from the stator according to the sixth embodiment in that the stator core has an integrated structure. The stator according to the eighth embodiment of the present invention also differs from the stator according to the seventh embodiment of the present invention in that the other end of the terminal member faces outward from the yoke in the axial direction.

[0204] FIG. 17 is a schematic perspective view showing an example of a stator according to an eighth embodiment of the present invention.

[0205] In the stator 20D shown in Fig. 17, the stator core 30B is not divided into split cores, unlike the stator core 30A shown in Fig. 2 and Fig. 15. In other words, the yoke 31B of the stator core 30B is not divided into split yokes, unlike the yoke 31A shown in Fig. 2 and Fig. 15.

[0206] In the stator 20A shown in FIG. 2, the coils 40 are arranged more densely than in the stator 20D, which makes it easier to improve the characteristics of the motor.

[0207] Similarly, in the stator 20B shown in FIG. 15, the coils 40 are arranged more densely than in the stator 20D, which makes it easier to improve the motor characteristics.

[0208] The motor of the eighth embodiment of the present invention is similar to the motor of the first embodiment of the present invention, except that it has the stator of the eighth embodiment of the present invention.

[0209] In embodiment 7, an example is shown in which the stator core is an integrated type compared to embodiment 1, and further, in embodiment 8, an example is shown in which the stator core is an integrated type compared to embodiment 6, but the stator core may be an integrated type compared to embodiments 2 to 5.

[0210] The stator of the present invention may be used not only as a component of a motor but also as a component of a generator, for example. [Explanation of symbols]

[0211] 1 motor 10 rotors 11 rotor yoke 12 shafts 13 Permanent magnets 20A, 20B, 20C, 20D Stator 30A, 30B stator core 31A, 31B Yoke (Core Back) 31Aa, 31Ab Yoke end faces 32 Teeth 33A, 33B terminal groove 34 First groove 35 Second groove 40 coils 41 Windings 41a One end of the winding 41b Other end of winding 50A, 50Aa, 50Ab, 50B, 50Ba, 50Bb terminal material 51Aa, 51Ab, 51Ba, 51Bb One end of terminal member 52Aa, 52Ab, 52Ba, 52Bb: other end of terminal member 53Aa First part of terminal member 54Aa Second part of terminal member 55Aa Third part of terminal member 60 Insulating material 70A, 70B, 70C, 70D, 70E coil units 80A, 80B, 80C, 80D, 80E split core 81A, 81B, 81C, 81D, 81E Split Yoke 81Aa, 81Ba, 81Ca, 81Da, 81Ea End faces of split yokes 82 Bulkhead 83 Groove (depression) 84 Hole (depression) AX axis R1, R2, R3 area

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 to which the winding is electrically connected, A terminal groove is provided on an end surface of the yoke in the axial direction of the stator core, the terminal member includes a linear portion extending from one end to the other end, the linear portion has a first extending portion including one end and a second extending portion including the other end, the first extending portion extends from one end of the terminal member in a direction opposite to a protruding direction of the teeth in the radial direction, the second extending portion extends from the first extending portion toward the other end of the terminal member so as to protrude from the terminal groove; The terminal member is fixed to the terminal groove in a state where one end of the terminal member is insulated from the terminal groove via an insulating member in the first extending portion, a terminal member that is electrically connected to one end of the winding so that the connection point is located within the terminal groove in the axial direction;

2. The stator according to claim 1 , wherein a bottom surface of the terminal groove is curved.

3. One end of the terminal member has a curved first portion that fits along the bottom surface of the terminal groove and a second portion that extends from one end of the first portion, 3. The stator according to claim 2, wherein one end of the winding is sandwiched and fixed between the first portion and the second portion of the terminal member inside the terminal groove.

4. 4. The stator according to claim 3, wherein the one end of the terminal member further includes a linear third portion extending in the axial direction from the other end of the first portion.

5. A stator according to any one of claims 1 to 4, wherein a first groove is further provided on an end face of the yoke in the axial direction, the first groove passing radially between the inner peripheral surface of the yoke and the terminal groove so as to be narrower than the terminal groove in the circumferential direction, and the first groove is insulated from the winding via the insulating member.

6. The stator according to claim 1 , wherein a bottom surface of the terminal groove is flat.

7. The stator according to claim 6 , wherein the terminal member has at least one flat portion in the linear portion.

8. a second groove extending from the terminal groove in the axial direction and insulated from the terminal member via the insulating member is provided on the outer peripheral surface of the yoke; 8. The stator according to claim 6, wherein the terminal member is folded back at the second extending portion such that a part of the other end side of the terminal member is positioned inside the second groove.

9. The stator according to any one of claims 1 to 4, 6 and 7, wherein a recess is provided in the bottom surface of the terminal groove.

10. A stator as described in any one of claims 1 to 4, 6 and 7, wherein in the linear portion, the first extension portion extends in the radial direction while the second extension portion extends from the first extension portion so that the other end of the terminal member faces outward from the yoke.

11. A stator as described in Claim 10, wherein in the linear portion, the first extension portion extends in the radial direction so that the other end of the terminal member faces outward from the yoke in the radial direction, while the second extension portion extends in the radial direction from the first extension portion.

12. A stator as described in Claim 10, wherein in the straight portion, the first extension portion extends in the radial direction while the second extension portion extends in the axial direction from the first extension portion so that the other end of the terminal member faces outward from the yoke in the axial direction.

13. Multiple coil units are arranged in a ring shape, The stator according to any one of claims 1 to 4, 6, and 7, 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.

14. The stator according to any one of claims 1 to 4, 6 and 7, wherein the stator core is made of a powder magnetic core.

15. A stator according to any one of claims 1 to 4, 6, and 7; a rotor provided opposite to the inner peripheral surface of the stator.

Images