Stator and motor

Abstract

To provide a stator capable of aggregating positions of coil ends in coil groups of three phases, and a motor.SOLUTION: A stator ST comprises a stator core 3, an insulator 4, a first-phase coil group, a second-phase coil group, and a third-phase coil group. The insulator includes upper insulators 41 and lower insulators 42. An upper wiring groove 411 is provided in the upper insulator. A lower wiring groove 421 is provided in the lower insulator. At least one of upper insulators includes a neutral point terminal 7. One coil end or the other coil end in each of the first-phase coil group, the second-phase coil group and the third-phase coil group is connected to the neutral point terminal over the upper wiring groove. Crossovers of the first-phase coil group, the second-phase coil group and the third-phase coil group other than the coil ends are wired to the lower wiring groove.SELECTED DRAWING: Figure 5

Description

Technical Field

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

Background Art

[0002] In a conventional stator of an electric motor, the first, third, and fifth coils are wound around the first, third, and fifth teeth in a first direction, the second, fourth, and sixth coils are wound around the second, fourth, and sixth teeth in a second direction, the seventh, ninth, and eleventh coils are wound around the seventh, ninth, and eleventh teeth in the second direction, and the eighth, tenth, and twelfth coils are wound around the eighth, tenth, and twelfth teeth in the first direction. According to the manufacturing method of the conventional stator of the electric motor, using a winding machine with a simple and inexpensive structure in which three nozzles can only rotate in the same direction at the same time, three windings can be wound simultaneously and quickly, and the stator of the electric motor can be manufactured quickly and inexpensively.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a stator of a conventional electric motor, each of a U-phase winding group composed of a first coil, a second coil, a seventh coil, and an eighth coil, a V-phase winding group composed of a third coil, a fourth coil, a ninth coil, and a tenth coil, and a W-phase winding group composed of a fifth coil, a sixth coil, an eleventh coil, and a twelfth coil has one terminal wire connected to a power supply terminal and the other terminal wire connected to a neutral point. In this case, only the one terminal wire of the U-phase winding group and the other terminal wire of the W-phase winding group are adjacent to each other in the circumferential direction, and the other terminal wires are separated from each other by at least one or more teeth in the circumferential direction. In other words, the one terminal wires and the other terminal wires of each of the U-phase winding group, the V-phase winding group, and the W-phase winding group are distributed in the circumferential direction. Therefore, the constraints on the shape of the motor increase. For example, the size of the circuit board for supplying current to the U-phase winding group, the V-phase winding group, and the W-phase winding group increases. As a result, the constraints on the shape of the motor increase.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a stator and a motor capable of aggregating the positions of the winding ends of each winding group of three phases.

Means for Solving the Problems

[0006] An exemplary stator according to the present invention includes a stator core arranged around a central axis extending in the vertical direction, an insulator covering at least a part of the stator core, a first-phase winding group composed of a plurality of windings in which a first conductor is wound around the stator core via the insulator, a second-phase winding group composed of a plurality of windings in which a second conductor is wound around the stator core via the insulator, and a third-phase winding group composed of a plurality of windings in which a third conductor is wound around the stator core via the insulator. The stator core includes a core back arranged annularly around the central axis, a first tooth extending radially from the core back, a second tooth extending radially from the core back, a third tooth extending radially from the core back, a fourth tooth extending radially from the core back, a fifth tooth extending radially from the core back, a sixth tooth extending radially from the core back, a seventh tooth extending radially from the core back, an eighth tooth extending radially from the core back, a ninth tooth extending radially from the core back, a tenth tooth extending radially from the core back, an eleventh tooth extending radially from the core back, and a twelfth tooth extending radially from the core back. The first tooth, the second tooth, the third tooth, the fourth tooth, the fifth tooth, the sixth tooth, the seventh tooth, the eighth tooth, the ninth tooth, the tenth tooth, the eleventh tooth, and the twelfth tooth are arranged circumferentially in this order. The first-phase winding group includes a first winding wound in a first direction via the insulator around the first tooth, a second winding wound in a second direction opposite to the first direction via the insulator around the second tooth, a seventh winding wound in the second direction via the insulator around the seventh tooth, and an eighth winding wound in the first direction via the insulator around the eighth tooth.The second-phase winding group includes a third winding wound in a first direction with respect to the third tooth via the insulator, a fourth winding wound in a second direction with respect to the fourth tooth via the insulator, a ninth winding wound in a second direction with respect to the ninth tooth via the insulator, and a tenth winding wound in a first direction with respect to the tenth tooth via the insulator. The third-phase winding group includes a fifth winding wound in a first direction with respect to the fifth tooth via the insulator, a sixth winding wound in a second direction with respect to the sixth tooth via the insulator, an eleventh winding wound in a second direction with respect to the eleventh tooth via the insulator, and a twelfth winding wound in a first direction with respect to the twelfth tooth via the insulator. In the first-phase winding group, the first winding and the eighth winding are connected, the eighth winding and the seventh winding are connected, and the seventh winding and the second winding are connected. In the second-phase winding group, the third winding and the tenth winding are connected, the tenth winding and the ninth winding are connected, and the ninth winding and the fourth winding are connected. In the third-phase winding group, the fifth winding and the twelfth winding are connected, the twelfth winding and the eleventh winding are connected, and the eleventh winding and the sixth winding are connected. One winding end of the first-phase winding group is located at the first tooth, one winding end of the second-phase winding group is located at the third tooth, and one winding end of the third-phase winding group is located at the fifth tooth. The other winding end of the first-phase winding group is located at the second tooth, the other winding end of the second-phase winding group is located at the fourth tooth, and the other winding end of the third-phase winding group is located at the sixth tooth. The insulator has an upper insulator covering the upper side of the stator core and a lower insulator covering the lower side of the stator core. The upper insulator is provided with upper wiring grooves. The lower insulator is provided with lower wiring grooves. At least one of the upper insulators has a neutral point terminal.One end or the other end of each of the first-phase winding group, the second-phase winding group, and the third-phase winding group is connected to the neutral point terminal across the upper wiring groove. The jumper wires of the first-phase winding group, the second-phase winding group, and the third-phase winding group other than the winding ends are wired in the lower wiring groove.

[0007] An exemplary motor of the present invention includes the above stator.

Advantages of the Invention

[0008] According to an exemplary aspect of the present invention, it is possible to provide a stator and a motor capable of aggregating the positions of the winding ends of each winding group of three phases.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7A

Figure 7B

Modes for Carrying Out the Invention

[0010] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and the description thereof will not be repeated.

[0011] In this specification, for convenience, there may be cases where the direction of the central axis AX (see FIG. 1) of the motor is described as the vertical direction. In the drawings, for ease of understanding, the X-axis, Y-axis, and Z-axis of the three-dimensional orthogonal coordinate system are appropriately shown. The positive direction of the Z-axis indicates the upward direction, and the negative direction of the Z-axis indicates the downward direction. However, the vertical direction, upward direction, and downward direction are defined for convenience of explanation and do not necessarily coincide with the vertical direction. Also, the vertical direction is merely defined for convenience of explanation and does not limit the orientation of the motor according to the present invention during use and assembly. Further, the direction parallel to the central axis AX of the motor is simply described as the "axial direction AD", and the radial direction and circumferential direction centered on the central axis AX of the motor are simply described as the "radial direction RD" and "circumferential direction CD", respectively. Also, "plan view" indicates viewing the object from the axial direction AD. Note that in this specification, the "parallel direction" includes a substantially parallel direction.

[0012] With reference to FIGS. 1 to 7B, a motor MT and a stator ST according to an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing the structure of a motor MT according to an embodiment of the present invention. The motor MT shown in FIG. 1 has 10 poles or 14 poles and is a three-phase motor with 12 slots. The three-phase motor is, for example, a three-phase brushless motor. Since the motor MT has 10 poles or 14 poles, cogging torque can be reduced as compared with an 8-pole motor.

[0013] As shown in FIG. 1, the motor MT includes a rotor RT, a stator ST, a rotating shaft SH, a first cover member 1, a first bearing 11, a second cover member 2, a second bearing 21, a substrate SB, and a casing CS.

[0014] The rotor RT is arranged around a central axis AX extending in the vertical direction. That is, as an example, the motor MT is an inner rotor type motor. Note that the motor MT may be an outer rotor type motor. The rotor RT rotates around the central axis AX. The rotor RT is arranged inside the radial direction RD of the stator ST.

[0015] The rotor RT has a magnet MG and a rotor core RC. The magnet MG is, for example, a permanent magnet. For example, the rotor RT may have a single substantially annular magnet MG, or may have a plurality of magnets MG arranged in the circumferential direction CD. "Substantially annular" is, for example, "substantially circular annular". The number of poles of the magnet MG is "10" or "14".

[0016] The rotor core RC is composed of, for example, a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction AD. The plurality of magnets MG are arranged inside the rotor core RC. In this embodiment, the rotor RT is a spoke type rotor. Note that the magnet MG may be fixed to the outer surface in the radial direction RD of the rotor core RC. That is, the motor MT may be an SPM (Surface Permanent Magnet) motor.

[0017] The rotating shaft SH is arranged around the central axis AX. The rotating shaft SH is substantially columnar. The rotating shaft SH is fixed to the rotor core RC. Therefore, the rotating shaft SH rotates together with the rotor RT around the central axis AX.

[0018] The first cover member 1 is arranged on the upper portion in the axial direction AD of the motor MT.

[0019] The first cover member 1 has a cylindrical first bearing holding portion 12 and a through hole formed in the center of the first bearing holding portion 12. The rotating shaft SH penetrates through the through hole. The first bearing holding portion 12 holds the first bearing 11. The first bearing 11 rotatably supports the rotating shaft SH. The first bearing 11 is, for example, a rolling bearing. The first cover member 1 is fitted to the opening side of the casing CS.

[0020] The second cover member 2 is disposed on the lower side of the axial direction AD of the motor MT.

[0021] The second cover member 2 has a cylindrical second bearing holding portion 22. The second bearing 21 rotatably supports the rotating shaft SH. The second bearing 21 is, for example, a rolling bearing. The second cover member 2 is fixed to the casing CS. The second bearing holding portion 22 holds the second bearing 21. The second bearing holding portion 22 has a substantially bottomed cylindrical shape with a hole at the center.

[0022] The stator ST is disposed around a central axis AX extending in the vertical direction. The stator ST faces the magnet MG in the radial direction RD. The stator ST includes a stator core 3, an insulator 4, and a three-phase winding group 5. In FIG. 1, a winding CL constituting a certain winding group 5 is shown. The winding CL is, for example, a coil. Specifically, the stator ST has a U-phase winding group 5U, a V-phase winding group 5V, and a W-phase winding group 5W as the three-phase winding group 5.

[0023] The U-phase winding group 5U is composed of a plurality of windings CL around which a first conductor 51 (FIG. 4) is wound around the stator core 3 via the insulator 4. The V-phase winding group 5V is composed of a plurality of windings CL around which a second conductor 52 (FIG. 4) is wound around the stator core 3 via the insulator 4. The W-phase winding group 5W is composed of a plurality of windings CL around which a third conductor 53 (FIG. 4) is wound around the stator core 3 via the insulator 4. The first conductor 51, the second conductor 52, and the third conductor 53 are coated conductors in which a metal wire is coated with a coating. The material of the metal wire is, for example, aluminum. However, the material of the metal wire may be copper instead of aluminum. The coating covering the metal wire is, for example, an insulating resin. The material of the resin is, for example, enamel. The insulator 4 electrically insulates the stator core 3 and the winding CL. The insulator 4 is made of an insulating material. The insulator 4 is composed of, for example, a thermoplastic resin.

[0024] The U-phase winding group 5U corresponds to an example of the "first-phase winding group", the V-phase winding group 5V corresponds to an example of the "second-phase winding group", and the W-phase winding group 5W corresponds to an example of the "third-phase winding group". Details of the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W will be described later.

[0025] The stator core 3 is arranged around a central axis AX extending in the vertical direction. As an example, the stator core 3 is arranged surrounding the central axis AX and is substantially annular. "Substantially annular" is, for example, "substantially circular-ring-shaped". The stator core 3 is constituted by, for example, a laminated steel plate in which thin electromagnetic steel plates are laminated in the axial direction AD. The stator core 3 has a core back 31 and a plurality of teeth T. Details of the stator core 3 will be described later.

[0026] The insulator 4 covers at least a part of the stator core 3. As an example, the insulator 4 is arranged surrounding the central axis AX and is substantially annular. "Substantially annular" is, for example, "substantially circular-ring-shaped". The insulator 4 is an electrical insulator. The insulator 4 may be constituted by a single member or may be constituted by a plurality of separate members. For example, the insulator 4 is a resin molded product into which the stator core 3 is inserted. Also, the insulator 4 may have a structure separately attached to the stator core 3. Details of the insulator 4 will be described later.

[0027] The substrate SB is substantially flat-plate-shaped. The substrate SB is substantially orthogonal to the axial direction AD. The substrate SB is a printed circuit board on which wiring is printed and mounts various electronic components. The substrate SB faces at least a part of the stator ST and at least a part of the rotor RT in the axial direction AD and is arranged substantially horizontally.

[0028] The casing CS houses at least a part of the rotor RT and the stator ST. Specifically, the casing CS has an opening that is open upward in the axial direction AD. The casing CS is substantially bottomed cylindrical and is a member made of a thermosetting resin. "Substantially bottomed cylindrical" is, for example, "substantially bottomed circular cylindrical". The casing CS is obtained by pouring resin into the mold into which the stator ST is inserted. That is, the casing CS is a resin molded product into which the stator ST is inserted. Therefore, the stator ST is fixed by the casing CS. The second bearing holding portion 22 is fixed to the bottom portion of the casing CS in the axial direction AD.

[0029] The casing CS covers at least the outer surface of the stator core 3 in the radial direction RD with resin. At least the inner surface of the stator core 3 in the radial direction RD is exposed from the casing CS. Also, the casing CS houses at least a part of the rotor RT.

[0030] Next, with reference to FIGS. 1 to 3, the details of the stator ST will be described. FIG. 2 is a plan view showing the stator ST. FIG. 3 is a plan view showing the stator core 3.

[0031] As shown in FIGS. 2 and 3, the core back 31 is arranged along the circumferential direction CD. Specifically, the core back 31 is arranged substantially annularly around the central axis AX. "Substantially annular" means, for example, "substantially angular annular" or "substantially circular annular". "Substantially angular annular" indicates that at least the outer edge is polygonal. "Substantially circular annular" indicates that at least the outer edge is circular. The core back 31 may be constituted by a single member or may be constituted by a plurality of separate members. As an example, the core back 31 has 12 core back portions 311. The 12 core back portions 311 are arranged along the circumferential direction CD. The 12 core back portions 311 may be configured as a single member or may be separate members. Also, as an example, the insulator 4 has 12 insulator portions 4a. The 12 insulator portions 4a are arranged along the circumferential direction CD. The 12 insulator portions 4a may be configured as a single member or may be separate members.

[0032] For example, as shown in FIG. 1, the insulator portion 4a covers a part of the teeth T and a part of the core back portion 311. Specifically, the insulator portion 4a covers both end faces in the axial direction AD of the teeth T, at least a part of one end face in the axial direction AD of the core back portion 311, and at least a part of the other end face in the axial direction AD of the core back portion 311. However, in addition to both end faces in the axial direction AD of the teeth T, at least a part of one end face in the axial direction AD of the core back portion 311, and at least a part of the other end face in the axial direction AD of the core back portion 311, the insulator portion 4a may also cover at least a part of one end face in the circumferential direction CD of the teeth T and at least a part of the other end face in the circumferential direction CD of the teeth T.

[0033] The insulator 4 has an upper insulator 41 and a lower insulator 42. The upper insulator 41 covers the upper side of the stator core 3. The lower insulator 42 covers the lower side of the stator core 3. The upper insulator 41 is provided with an upper wiring groove 411, and the lower insulator 42 is provided with a lower wiring groove 421. Details of the upper wiring groove 411 and the lower wiring groove 421 will be described later.

[0034] As shown in FIGS. 2 and 3, the stator core 3 has a plurality of teeth T (FIG. 1), namely, a first tooth T1, a second tooth T2, a third tooth T3, a fourth tooth T4, a fifth tooth T5, a sixth tooth T6, a seventh tooth T7, an eighth tooth T8, a ninth tooth T9, a tenth tooth T10, an eleventh tooth T11, and a twelfth tooth T12. The first tooth T1 to the twelfth tooth T12 are arranged at equal intervals along the circumferential direction CD. The twelve core back portions 311 are respectively provided corresponding to the first tooth T1 to the twelfth tooth T12. The twelve insulator portions 4a are respectively provided corresponding to the first tooth T1 to the twelfth tooth T12.

[0035] The first tooth T1, the second tooth T2, the third tooth T3, the fourth tooth T4, the fifth tooth T5, the sixth tooth T6, the seventh tooth T7, the eighth tooth T8, the ninth tooth T9, the tenth tooth T10, the eleventh tooth T11, and the twelfth tooth T12 extend radially in the radial direction RD from the core back 31. As an example, the first tooth T1 to the twelfth tooth T12 extend radially inward in the radial direction RD from the core back 31.

[0036] The first tooth T1, the second tooth T2, the third tooth T3, the fourth tooth T4, the fifth tooth T5, the sixth tooth T6, the seventh tooth T7, the eighth tooth T8, the ninth tooth T9, the tenth tooth T10, the eleventh tooth T11, and the twelfth tooth T12 are arranged in this order in the circumferential direction CD.

[0037] The U-phase winding group 5U has, as the winding CL (Fig. 1), a first winding U1, a second winding U4, a seventh winding U3, and an eighth winding U2. The first winding U1 is wound around the first tooth T1 in the first direction D1 via the insulator 4. The first direction D1 indicates, for example, clockwise. The second winding U4 is wound around the second tooth T2 in the second direction D2 opposite to the first direction D1 via the insulator 4. The second direction D2 indicates, for example, counterclockwise. The seventh winding U3 is wound around the seventh tooth T7 in the second direction D2 via the insulator 4. The eighth winding U2 is wound around the eighth tooth T8 in the first direction D1 via the insulator 4.

[0038] The V-phase winding group 5V has, as the winding CL (Fig. 1), a third winding V1, a fourth winding V4, a ninth winding V3, and a tenth winding V2. The third winding V1 is wound around the third tooth T3 in the first direction D1 via the insulator 4. The fourth winding V4 is wound around the fourth tooth T4 in the second direction D2 via the insulator 4. The ninth winding V3 is wound around the ninth tooth T9 in the second direction D2 via the insulator 4. The tenth winding V2 is wound around the tenth tooth T10 in the first direction D1 via the insulator 4.

[0039] The W-phase winding group 5W has, as the winding CL (Fig. 1), a fifth winding W1, a sixth winding W4, an eleventh winding W3, and a twelfth winding W2. The fifth winding W1 is wound around the fifth tooth T5 in the first direction D1 via the insulator 4. The sixth winding W4 is wound around the sixth tooth T6 in the second direction D2 via the insulator 4. The eleventh winding W3 is wound around the eleventh tooth T11 in the second direction D2 via the insulator 4. The twelfth winding W2 is wound around the twelfth tooth T12 in the first direction D1 via the insulator 4.

[0040] At least one of the upper insulators 41 has a neutral point terminal 7. The neutral point terminal 7 is a pin-shaped terminal. The neutral point terminal 7 is located at the first tooth T1. The potential of the neutral point terminal 7 is set to a constant potential, for example. The constant potential is, for example, zero volts. In this case, the neutral point terminal 7 is grounded, for example.

[0041] The stator ST further includes a U-phase terminal 81, a V-phase terminal 82, and a W-phase terminal 83. The U-phase terminal 81 corresponds to an example of the "first-phase terminal", the V-phase terminal 82 corresponds to an example of the "second-phase terminal", and the W-phase terminal 83 corresponds to an example of the "third-phase terminal". The U-phase terminal 81 is located at the third tooth T3. The V-phase terminal 82 is located at the fourth tooth T4. The W-phase terminal 83 is located at the fifth tooth T5.

[0042] The U-phase terminal 81, the V-phase terminal 82, and the W-phase terminal 83 are not directly electrically connected to the third winding V1, the fourth winding V4, and the fifth winding W1 wound around the first tooth T1, the third tooth T3, and the fifth tooth T5, respectively. However, the U-phase terminal 81, the V-phase terminal 82, and the W-phase terminal 83 may be electrically connected to the third winding V1, the fourth winding V4, and the fifth winding W1.

[0043] Here, the U-phase terminal 81 functions as a terminal for energizing the U-phase winding group 5U. The V-phase terminal 82 functions as a terminal for energizing the V-phase winding group 5V. The W-phase terminal 83 functions as a terminal for energizing the W-phase winding group 5W. The U-phase terminal 81 to the W-phase terminal 83 are made of a conductive metal, for example. Note that the U-phase terminal 81 to the W-phase terminal 83 may be directly connected to a wiring pattern formed on the substrate SB.

[0044] Next, with reference to FIG. 4, the details of the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W will be described. FIG. 4 is a schematic diagram when the stator ST is linearly developed. In FIG. 4, the first teeth T1 to the twelfth teeth T12 are schematically represented by rectangular figures. Also, the first windings U1 to the twelfth windings W2 are schematically represented by rectangular figures with arrows. In this case, the arrows indicate the winding directions of the first windings U1 to the twelfth windings W2.

[0045] As shown in FIG. 4, in the U-phase winding group 5U, the first winding U1 and the eighth winding U2 are connected. In addition, the eighth winding U2 and the seventh winding U3 are connected. In addition, the seventh winding U3 and the second winding U4 are connected. Specifically, the U-phase winding group 5U has jumper wires 511, 512, 513 that connect the windings. The jumper wires 511, 512, 513 are part of the first conductor 51. And the jumper wire 511 connects the first winding U1 and the eighth winding U2. The jumper wire 512 connects the eighth winding U2 and the seventh winding U3. The jumper wire 513 connects the seventh winding U3 and the second winding U4. That is, the first winding U1, the eighth winding U2, the seventh winding U3, and the second winding U4 are connected in series in this order by the jumper wires 511 to 513.

[0046] In the V-phase winding group 5V, the third winding V1 and the tenth winding V2 are connected. In addition, the tenth winding V2 and the ninth winding V3 are connected. In addition, the ninth winding V3 and the fourth winding V4 are connected. Specifically, the V-phase winding group 5V has jumper wires 521, 522, ⑤23 that connect the windings. The jumper wires 521, 522, 523 are part of the second conductor 52. And the jumper wire 521 connects the third winding V1 and the tenth winding V2. The jumper wire 522 connects the tenth winding V2 and the ninth winding V3. The jumper wire 523 connects the ninth winding V3 and the fourth winding V4. That is, the third winding V1, the tenth winding V2, the ninth winding V3, and the fourth winding V4 are connected in series in this order by the jumper wires 521 to 523.

[0047] In the W-phase winding group 5W, the fifth winding W1 and the twelfth winding W2 are connected. In addition, the twelfth winding W2 and the eleventh winding W3 are connected. In addition, the eleventh winding W3 and the sixth winding W4 are connected. Specifically, the W-phase winding group 5W has jumper wires 531, 532, 533 that connect the windings to each other. The jumper wires 531, 532, 533 are part of the third conductor 53. And the jumper wire 531 connects the fifth winding W1 and the twelfth winding W2. The jumper wire 532 connects the twelfth winding W2 and the eleventh winding W3. The jumper wire 533 connects the eleventh winding W3 and the sixth winding W4. That is, the fifth winding W1, the twelfth winding W2, the eleventh winding W3, and the sixth winding W4 are connected in series in this order by the jumper wires 531 to 533.

[0048] One winding end 5US of the U-phase winding group 5U is located at the first tooth T1. One winding end 5VS of the V-phase winding group 5V is located at the third tooth T3. One winding end 5WS of the W-phase winding group 5W is located at the fifth tooth T5.

[0049] In addition, the other winding end 5UE of the U-phase winding group 5U is located at the second tooth T2. The other winding end 5VE of the V-phase winding group 5V is located at the fourth tooth T4. The other winding end 5WE of the W-phase winding group 5W is located at the sixth tooth T6.

[0050] Therefore, according to the present embodiment, in the stator ST having a 12-slot structure, the winding ends 5US, 5UE of the U-phase winding group 5U, the winding ends 5VS, 5VE of the V-phase winding group 5V, and the winding ends 5WS, 5WE of the W-phase winding group 5W can be aggregated at the first tooth T1 to the sixth tooth T6. That is, the positions of the winding ends 5US, 5UE, 5VS, 5VE, 5WS, 5WE of each of the three-phase winding groups 5 can be aggregated. Therefore, compared with the case where the positions of the winding ends of each of the three phases are dispersed in the circumferential direction, the restrictions on the shape of the motor MT can be relaxed. For example, it is possible to suppress an increase in the size of the substrate SB for supplying current to the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W. As a result, compared with the case where the size of the substrate is large, the restrictions on the shape of the motor MT are reduced. Note that, for example, when the positions of the winding ends of each of the three-phase winding groups are dispersed in the circumferential direction, the size of the substrate becomes large, and the restrictions on the shape of the motor become large.

[0051] Note that, for example, the winding ends 5US, 5VS, 5WS respectively indicate the starting ends of the first conductor 51, the second conductor 52, and the third conductor 53. In this case, for example, the winding ends 5UE, 5VE, 5WE respectively indicate the ending ends of the first conductor 51, the second conductor 52, and the third conductor 53. However, for this example, the start and the end may be reversed.

[0052] As described above, the U-phase winding group 5U has, as the winding CL, the first winding U1, the second winding U4, the seventh winding U3, and the eighth winding U2, and also has jumper wires 511, 512, 513. For example, the winding end 5US is located at one end of the U-phase winding group 5U, and the winding end 5UE is located at the other end of the U-phase winding group 5U. The winding end 5US is electrically connected to the jumper wire 510. The jumper wire 510 electrically connects the U-phase terminal 81 and the winding end 5US. The jumper wire 510 is a part of the first conductor 51 that constitutes the U-phase winding group 5U. Thereby, it is not necessary to provide a separate component for electrically connecting the U-phase terminal 81 and the winding end 5US. However, the jumper wire 510 may be composed of a conductor different from the first conductor 51 that constitutes the U-phase winding group 5U.

[0053] Also, the winding end portion 5UE is connected to the jumper wire 514. The jumper wire 514 electrically connects the winding end portion 5UE and the neutral point terminal 7. The jumper wire 514 is a part of the first conductor 51 that constitutes the U-phase winding group 5U. Thereby, it is not necessary to provide a separate component for electrically connecting the winding end portion 5UE and the neutral point terminal 7. However, the jumper wire 514 may be composed of a conductor different from the first conductor 51 that constitutes the U-phase winding group 5U.

[0054] Also, the V-phase winding group 5V has, as the winding CL, a third winding V1, a fourth winding V4, a ninth winding V3, and a tenth winding V2, and also has jumper wires 521, 522, and 523. For example, the winding end portion 5VS is located at one end of the V-phase winding group 5V, and the winding end portion 5VE is located at the other end of the V-phase winding group 5V. The winding end portion 5VS is electrically connected to the jumper wire 520. The jumper wire 520 electrically connects the winding end portion 5VS and the neutral point terminal 7. The jumper wire 520 is a part of the second conductor 52 that constitutes the V-phase winding group 5V. Thereby, it is not necessary to provide a separate component for electrically connecting the winding end portion 5VS and the neutral point terminal 7. However, the jumper wire 520 may be composed of a conductor different from the second conductor 52 that constitutes the V-phase winding group 5V.

[0055] Note that the winding end portion 5VE is electrically connected to the V-phase terminal 82 via the wiring 524. The wiring 524 is a part of the second conductor 52 that constitutes the V-phase winding group 5V. For example, the wiring 524 is a part of the winding end portion 5VE. Thereby, it is not necessary to provide a separate component for electrically connecting the V-phase terminal 82 and the winding end portion 5VE.

[0056] Similarly, the W-phase winding group 5W has, as winding CL, a fifth winding W1, a sixth winding W4, an eleventh winding W3, and a twelfth winding W2, and has jumper wires 531, 532, 533. For example, the winding end 5WS is located at one end of the W-phase winding group 5W, and the winding end 5WE is located at the other end of the W-phase winding group 5W. The winding end 5WE is connected to the jumper wire 534. The jumper wire 534 electrically connects the winding end 5WE and the neutral terminal 7. The jumper wire 534 is a part of the third conductor 53 that constitutes the W-phase winding group 5W. Thereby, it is not necessary to provide a separate component for electrically connecting the winding end 5WE and the neutral terminal 7. However, the jumper wire 534 may be composed of a conductor different from the third conductor 53 that constitutes the W-phase winding group 5W.

[0057] Note that the winding end 5WS is electrically connected to the W-phase terminal 83 via the wiring 530. The wiring 530 is a part of the third conductor 53 that constitutes the W-phase winding group 5W. Thereby, it is not necessary to provide a separate component for electrically connecting the W-phase terminal 83 and the winding end 5WS.

[0058] According to this embodiment, the winding directions of the first winding U1, the third winding V1, and the fifth winding W1 are the first direction D1 and are the same. Therefore, the winding of the first conductor 51 around the first tooth T1, the winding of the second conductor 52 around the third tooth T3, and the winding of the third conductor 53 around the fifth tooth T5 can be simultaneously performed in the first direction D1. In addition, the winding directions of the eighth winding U2, the tenth winding V2, and the twelfth winding W2 are the first direction D1 and are the same. Therefore, the winding of the first conductor 51 around the eighth tooth T8, the winding of the second conductor 52 around the tenth tooth T10, and the winding of the third conductor 53 around the twelfth tooth T12 can be simultaneously performed in the first direction D1.

[0059] In addition, the winding directions of the seventh winding U3, the ninth winding V3, and the eleventh winding W3 are the second direction D2 and are the same. Therefore, the winding of the first conductor 51 around the seventh tooth T7, the winding of the second conductor 52 around the ninth tooth T9, and the winding of the third conductor 53 around the eleventh tooth T11 can be simultaneously performed in the second direction D2. In addition, the winding directions of the second winding U4, the fourth winding V4, and the sixth winding W4 are the second direction D2 and are the same. Therefore, the winding of the first conductor 51 around the second tooth T2, the winding of the second conductor 52 around the fourth tooth T4, and the winding of the third conductor 53 around the sixth tooth T6 can be simultaneously performed in the second direction D2.

[0060] As a result, in the stator ST, the winding time for forming the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W can be shortened.

[0061] Furthermore, according to the present embodiment, the winding end 5UE of the U-phase winding group 5U, the winding end 5VS of the V-phase winding group 5V, and the winding end 5WE of the W-phase winding group 5W are connected to the neutral point terminal 7. In this case, by energizing the winding end 5US of the U-phase winding group 5U, the winding end 5VE of the V-phase winding group 5V, and the winding end 5WS of the W-phase winding group 5W, the energization directions can be made the same. Therefore, it is not necessary to individually control the energization directions for the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W. As a result, the control of the control IC (Integrated Circuit) for energizing the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W and the wiring pattern of the substrate SB can be simplified.

[0062] Also, the first conductor 51 of the U-phase is drawn out from the second tooth T2. Specifically, the winding end 5UE of the U-phase is drawn out from the second tooth T2 via the jumper wire 514. The second conductor 52 of the V-phase is drawn out from the third tooth T3. Specifically, the winding end 5VS of the V-phase is drawn out from the third tooth T3 via the jumper wire 520. The third conductor 53 of the W-phase is drawn out from the sixth tooth T6. Specifically, the winding end 5WE of the W-phase is drawn out from the sixth tooth T6 via the jumper wire 534.

[0063] The first conductor 51, the second conductor 52, and the third conductor 53 drawn from the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W are wound around the neutral point terminal 7. By drawing the three-phase first conductors 51 to 53 from the same direction, when winding the first conductors 51 to 53 around the neutral point terminal 7, the three can be wound in the same direction at the same time, making the winding easier.

[0064] Also, the first conductor 51 of the U-phase winding group 5U drawn from the first tooth T1 is connected to the U-phase terminal 81. The second conductor 52 of the V-phase winding group 5V drawn from the fourth tooth T4 is connected to the V-phase terminal 82. The third conductor 53 of the W-phase winding group 5W drawn from the fifth tooth T5 is connected to the W-phase terminal 83. Here, the V-phase terminal 82 is connected to the fourth tooth T4 where the winding end 5VE of the V-phase winding group 5V is located, and the W-phase terminal 83 is connected to the fifth tooth T5 where the winding end 5WS of the W-phase winding group 5W is located. Therefore, except for the U-phase, the winding ends can be connected to the terminals at the same tooth position at a short distance.

[0065] With reference to FIGS. 5 and 6, the stator ST will be further described. FIG. 5 is a perspective view showing the stator ST. FIG. 6 is a side view showing the stator ST.

[0066] As shown in FIGS. 5 and 6, one winding end or the other winding end of each of the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W is connected to the neutral point terminal 7 across the upper wiring groove 411. Specifically, the winding end 5UE of the U-phase winding group 5U, the winding end 5VS of the V-phase winding group 5V, and the winding end 5WE of the W-phase winding group 5W are connected to the neutral point terminal 7 across the upper wiring groove 411. Also, the jumper wires of the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W other than the winding ends are wired in the lower wiring groove 421. Specifically, the jumper wires 511 to 513, 521 to 523, and 531 to 533 of the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W are arranged in the lower wiring groove 421. Therefore, while avoiding the jumper wires from being intricately intertwined with each other, the three-phase windings can be connected to the neutral point terminal 7 without using another connecting component.

[0067] Next, with reference to FIGS. 7A and 7B, the U-phase terminal 81, V-phase terminal 82, and W-phase terminal 83 will be described. FIG. 7A is a diagram showing the U-phase terminal 81. FIG. 7B is a diagram showing the vicinity of the U-phase terminal 81. Since the V-phase terminal 82 and the W-phase terminal 83 have the same configuration as the U-phase terminal 81, the description thereof will be omitted.

[0068] As shown in FIG. 7A, the U-phase terminal 81 has a winding connection portion 811, a power supply connection portion 812, and a conduction portion 813. The conduction portion 813 connects the winding connection portion 811 and the power supply connection portion 812. The winding connection portion 811 protrudes in the Z direction from the conduction portion 813. The power supply connection portion 812 protrudes in the Z direction from the conduction portion 813. The length of the power supply connection portion 812 is longer than that of the winding connection portion 811.

[0069] A winding is connected to the winding connection portion 811. Specifically, the first conductor 51 that constitutes the U-phase winding group 5U is wound around the winding connection portion 811. The power supply connection portion 812 is connected to a component that supplies power to the winding. Specifically, the power supply connection portion 812 is connected to a component that supplies power to the U-phase winding group 5U.

[0070] As shown in FIG. 7B, the conduction portion 813 is attached to the insulator 4. By separating the winding connection portion 811 and the power supply connection portion 812, it is possible to separate the solder for winding connection and the solder for connecting components such as the pattern of the circuit board and the lead wire terminal. In particular, even if the types of metals of the wiring connected to the winding connection portion 811 and the components connected to the power supply connection portion 812 are different, it is possible to suppress corrosion caused by the contact of dissimilar metals.

[0071] Also, the winding connection portion 811 is provided closer to the winding end portion 5US of the U-phase winding group 5U corresponding to the winding connection portion 811 than the power supply connection portion 812. Therefore, the distance of the jumper wire 510 (FIG. 5) can be shortened.

[0072] Further, the upper insulator 41 has a jumper wire hanging portion 412 extending outside the upper wiring groove 411. Here, the jumper wire hanging portion 412 is located outside (upper side) in the axial direction AD with respect to the upper wiring groove 411. The winding connection portion 811 is provided closer to the winding connection portion 811 than the jumper wire hanging portion 412 with respect to the winding end portion 5US of the U-phase winding group 5U corresponding to the winding connection portion 811. Therefore, by arranging the winding connection portion 811 in the direction of hooking and returning the jumper wire 510 to the jumper wire hanging portion 412, soldering connection can be performed while applying a certain tension to the jumper wire 510, making the connection possible easily.

[0073] As described above, the embodiments of the present invention have been described with reference to the drawings (FIGS. 1 to 7B). However, the present invention is not limited to the above-described embodiments, and can be implemented in various forms without departing from the gist thereof. The drawings are schematically shown mainly for each component for easy understanding, and the thickness, length, number, etc. of each illustrated component are different from the actual ones for convenience of drawing creation. Also, the materials, shapes, dimensions, etc. of each component shown in the above embodiments are examples and are not particularly limited, and various changes can be made without substantially departing from the effects of the present invention.

Explanation of Reference Numerals

[0074] 3 Stator Core 31 Core Back 4 Insulator 411 Upper Wiring Groove 421 Lower Wiring Groove 5U U-Phase Winding Group (First Phase Winding Group) 5V V-Phase Winding Group (Second Phase Winding Group) 5W W-Phase Winding Group (Third Phase Winding Group) 7 Neutral Point Terminal 81 U-Phase Terminal 82 V-Phase Terminal 83 W-Phase Terminal CS Casing (Molded Resin Part) MT Motor RT Rotor ST Stator T1~T12 First Tooth~Twelfth Tooth U1, the first winding U4, the second winding V1, the third winding V4, the fourth winding W1, the fifth winding W4, the sixth winding U3, the seventh winding U2, the eighth winding V3, the ninth winding V2, the tenth winding W3, the eleventh winding W2, the twelfth winding

Claims

1. A stator core arranged around a central axis extending in the vertical direction, An insulator covering at least a part of the stator core, A first-phase winding group composed of a plurality of windings in which a first conductor is wound around the stator core via the insulator, A second-phase winding group composed of a plurality of windings in which a second conductor is wound around the stator core via the insulator, A third-phase winding group composed of a plurality of windings in which a third conductor is wound around the stator core via the insulator, having, The stator core, A core back arranged annularly around the central axis, A first tooth extending radially from the core back, A second tooth extending radially from the core back, A third tooth extending radially from the core back, A fourth tooth extending radially from the core back, A fifth tooth extending radially from the core back, A sixth tooth extending radially from the core back, A seventh tooth extending radially from the core back, An eighth tooth extending radially from the core back, A ninth tooth extending radially from the core back, A tenth tooth extending radially from the core back, An eleventh tooth extending radially from the core back, A twelfth tooth extending radially from the core back having, The first tooth, the second tooth, the third tooth, the fourth tooth, the fifth tooth, the sixth tooth, the seventh tooth, the eighth tooth, the ninth tooth, the tenth tooth, the eleventh tooth, and the twelfth tooth are arranged in the circumferential direction in this order, The first-phase winding group has a first winding wound in a first direction via the insulator with respect to the first tooth, a second winding wound in a second direction opposite to the first direction via the insulator with respect to the second tooth, a seventh winding wound in the second direction via the insulator with respect to the seventh tooth, and an eighth winding wound in the first direction via the insulator with respect to the eighth tooth, The second-phase winding group includes a third winding wound in a first direction around the third tooth via the insulator, a fourth winding wound in a second direction around the fourth tooth via the insulator, a ninth winding wound in the second direction around the ninth tooth via the insulator, and a tenth winding wound in the first direction around the tenth tooth via the insulator. The third-phase winding group includes a fifth winding wound in a first direction around the fifth tooth via the insulator, a sixth winding wound in a second direction around the sixth tooth via the insulator, an eleventh winding wound in the second direction around the eleventh tooth via the insulator, and a twelfth winding wound in the first direction around the twelfth tooth via the insulator. In the first-phase winding group, the first winding and the eighth winding are connected, the eighth winding and the seventh winding are connected, and the seventh winding and the second winding are connected. In the second-phase winding group, the third winding and the tenth winding are connected, the tenth winding and the ninth winding are connected, and the ninth winding and the fourth winding are connected. In the third-phase winding group, the fifth winding and the twelfth winding are connected, the twelfth winding and the eleventh winding are connected, and the eleventh winding and the sixth winding are connected. One winding end of the first-phase winding group is located at the first tooth, one winding end of the second-phase winding group is located at the third tooth, and one winding end of the third-phase winding group is located at the fifth tooth. The other winding end of the first-phase winding group is located at the second tooth, the other winding end of the second-phase winding group is located at the fourth tooth, and the other winding end of the third-phase winding group is located at the sixth tooth. The insulator includes an upper insulator covering the upper side of the stator core, and a lower insulator covering the lower side of the stator core. The upper insulator is provided with upper wiring grooves. The lower insulator is provided with lower wiring grooves. At least one of the upper insulators has a neutral point terminal. One winding end or the other winding end of each of the first-phase winding group, the second-phase winding group, and the third-phase winding group is connected to the neutral point terminal across the upper wiring grooves. The stator has jumper wires of the first-phase winding group, the second-phase winding group, and the third-phase winding group other than the winding ends, which are wired in the lower wiring groove.

2. The neutral point terminal is a pin-shaped terminal, the neutral point terminal is located on the first tooth, the first conductor of the first-phase winding group is drawn out from the second tooth, the second conductor of the second-phase winding group is drawn out from the third tooth, the third conductor of the third-phase winding group is drawn out from the sixth tooth, The stator according to claim 1, wherein the first conductor, the second conductor, and the third conductor drawn out from the first-phase winding group, the second-phase winding group, and the third-phase winding group are wound around the neutral point terminal.

3. a first-phase terminal, a second-phase terminal, a third-phase terminal further comprising, the first-phase terminal is located on the third tooth, the second-phase terminal is located on the fourth tooth, the third-phase terminal is located on the fifth tooth, the first conductor of the first-phase winding group drawn out from the first tooth is connected to the first-phase terminal, the second conductor of the second-phase winding group drawn out from the fourth tooth is connected to the second-phase terminal, The stator according to claim 1 or claim 2, wherein the third conductor of the third-phase winding group drawn out from the fifth tooth is connected to the third-phase terminal.

4. each of the first-phase terminal, the second-phase terminal, and the third-phase terminal has a winding connection portion, a power connection portion, and a conduction portion connecting the winding connection portion and the power connection portion and has, a winding is connected to the winding connection portion, the power connection portion is connected to a component that supplies power to the winding, The stator according to claim 3, wherein the conduction portion is attached to the insulator.

5. The stator according to claim 4, wherein the winding connection portion is provided closer to the winding end of the winding group corresponding to the winding connection portion than the power connection portion.

6. The upper insulator has a jumper wire hanging portion outside the upper wiring groove, The stator according to claim 5, wherein the winding connection portion is provided closer to the winding end of the winding group corresponding to the winding connection portion than the jumper wire hanging portion.

7. A motor comprising the stator according to any one of claims 1 to 6.

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