Motor

Abstract

To provide a motor that is further miniaturized.SOLUTION: A motor includes a shaft, a rotor fixed to the shaft, a stator core 44 arranged to face the rotor, an insulating member 45 mounted on the stator core 44, and a coil 42 wound around the insulating member 45. A crossover 422 connected to the end of winding of the coil 42 is arranged to extend in the circumferential direction ef of a radial outer side c of the insulating member 45, the insulating member 45 has a convex portion 451 protruding from a position where the crossover 422 extends and a concave portion 452 recessed from the position where the crossover extends in an axial direction ab on the radial outer side c, a leader line 421 connected to the beginning of winding of the coil 42 is arranged in a recess portion 452, and the crossover 422 is arranged inside the convex portion 451 in the radial direction cd.SELECTED DRAWING: Figure 8

Description

[Technical field]

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

[0002] Conventionally, motors have been used as the driving source for various devices. There are various types of motors, and the motor to be used is selected according to the purpose and the situation. For various motors, in addition to improving the basic performance as a motor, there is a demand for further miniaturization.

[0003] For example, in the motor described in Patent Document 1, the size of the motor is reduced by changing the way the coil wire is wound. In this way, various technical innovations have been implemented to make motors as small as possible. However, there is still a demand to achieve even greater size reduction by accumulating various technical innovations. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-204720 A Summary of the Invention [Problem to be solved by the invention]

[0005] An example of an object of the present invention is to provide a motor that is further miniaturized. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention employs the following means. That is, a motor according to one aspect of the present invention includes a shaft and A rotor fixed to the shaft; a stator core facing the rotor; an insulating member attached to the stator core; A coil wound around the insulating member; Equipped with A jumper wire connected to an end of the coil is disposed on a radially outer side of the insulating member and extends in a circumferential direction, The insulating member has, on a radially outer side, a convex portion protruding from a position where the jumper wire extends in the axial direction and a concave portion recessed from the position where the jumper wire extends, A lead wire connected to the beginning of the coil is disposed in the recess, The crossover wire is disposed radially inside the protruding portion.

[0007] The lead wire may be disposed in the recess between the insulating member and the crossover wire.

[0008] The insulating member has a wall portion on a radially outer side, the wall portion protruding in an axial direction and extending in a circumferential direction, The wall portion has one or more grooves extending in a circumferential direction on a radially outer side thereof, The crossover wire may be disposed in the groove.

[0009] In one aspect of the present invention, the recessed portion and the protruding portion may be adjacent to each other in the circumferential direction. In one aspect of the present invention, the lead wire connected to the beginning of the winding of the coil extends radially outward in the recess and then extends away from the recess in the axial direction. It is acceptable for the robot to be standing upright. [Brief description of the drawings]

[0010] [Figure 1] 3 is a longitudinal sectional view of the motor according to the embodiment of the present invention, and is a sectional view taken along line BB in FIG. 2. [Diagram 2] 2 is a cross-sectional view of the motor according to the embodiment of the present invention, taken along line AA in FIG. [Diagram 3] 1 is a perspective view of a motor according to an embodiment of the present invention with a housing cover removed, as viewed obliquely from above. FIG. [Figure 4]FIG. 2 is a perspective view of a holding member included in the motor according to the embodiment of the present invention. [Diagram 5] 1 is an enlarged vertical sectional view of a motor according to an embodiment of the present invention. [Figure 6] FIG. 2 is a plan view of the motor according to the embodiment of the present invention with the housing cover removed. [Figure 7] FIG. 2 is a top view of a stator included in the motor according to the embodiment of the present invention. [Figure 8] FIG. 2 is an enlarged perspective view of a specific coil having a lead wire drawn out from one end thereof, among the coils included in the motor according to the embodiment of the present invention. [Figure 9] 9 is a longitudinal sectional view of section QQ in FIG. 8. [Figure 10] FIG. 9 is a cross-sectional perspective view of the QQ section in FIG. 8. [Figure 11] FIG. 9 is a longitudinal sectional view taken along the line PP in FIG. 8. [Figure 12] 13 is a vertical cross-sectional view of a motor according to a modified example of an embodiment of the present invention. FIG. [Figure 13] 13 is a perspective view of a holding member provided in a motor according to a modified example of the present invention. FIG. [Figure 14] FIG. 11 is an enlarged vertical sectional view of a motor according to a modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a motor 1 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of a motor 1 according to this embodiment. Fig. 2 is a transverse sectional view of a motor 1 according to this embodiment. Fig. 1 corresponds to the BB sectional view in Fig. 2, and Fig. 2 corresponds to the AA sectional view in Fig. 1. Fig. 1 also corresponds to the CC sectional view in Fig. 3, which will be described later. The motor 1 is an inner rotor type three-phase motor, and is a spoke type IPM motor.

[0012] In the description of this embodiment, the terms "upper" and "lower" refer to the upper and lower positions in FIG. 1, and do not necessarily coincide with the upper and lower positions in the direction of gravity. Furthermore, in the direction of axis x (hereinafter also referred to as the "axial direction"), the direction of arrow a is the upper side a, and the direction of arrow b is the lower side b. In addition, in the direction perpendicular to axis x (hereinafter also referred to as the "radial direction"), the direction away from axis x (the direction of arrow c) is the outer circumferential side c, and the direction toward axis x (the direction of arrow d) is the inner circumferential side d. The clockwise circumferential direction (the circumferential direction as seen from the upper side a) around the rotation axis x is the circumferential direction e, and the counterclockwise circumferential direction f.

[0013] IPM motors are classified as synchronous motors, and magnets are embedded in the rotor. In a spoke-type IPM motor, the cross section of the multiple magnets appears as a rectangle in a cross section of the rotor perpendicular to the motor's rotation axis. The magnets are arranged radially so that the longitudinal direction of the rectangle coincides with the radial direction of the rotor. In a spoke-type IPM motor, the surface of each magnet on the long side of the rectangle serves as a magnetic pole. Furthermore, the opposing magnetic pole faces of adjacent magnets in the circumferential direction of the rotor have the same polarity.

[0014] As shown in FIG. 1, the motor 1 includes a shaft 2 serving as a rotating shaft, a rotor 3, a stator 4 including a coil 42, a housing 5 that accommodates the rotor 3 and the stator 4, and the coil 42. and a holding member 7 that holds the power supply lines 6 within the housing 5.

[0015] The housing 5 accommodates some of the components of the motor 1, such as the rotor 3, the stator 4, and the retaining member 7. The housing 5 has a housing body 5A having a circular opening 105, and a cover 5B that closes at least a portion of the opening 105 of the housing body 5A. The housing main body 5A includes a tubular portion 51, a bottom portion 52, and a flange portion 53. The tubular portion 51 is cylindrical, and its end on the upper side a forms an opening 105. The flange portion 53 is continuous with the end on the upper side a of the tubular portion 51, and the bottom portion 52 is continuous with the end on the lower side b of the tubular portion 51. The bottom portion 52 has a bottom surface portion 52a and a protruding portion 52b.

[0016] The bottom surface portion 52a is an annular flat plate portion covering the end portion of the bottom side (lower side b) of the tube portion 51. The protruding portion 52b is a cylindrical portion protruding from the center of the bottom surface portion 52a toward the upper side a. A bearing 81 is fixed to the inside of the protruding portion 52b by press fitting or the like. Note that a circular hole having an inner diameter smaller than the inner diameter of the protruding portion 52b may be provided in the center of the bottom surface portion 52a.

[0017] The cover 5B has a flat plate portion 5Ba, a protruding portion 5Bb, and a flange portion 5Bc. The flat plate portion 5Ba is an annular portion having a hole portion 5Bd through which the shaft 2 passes. The protruding portion 5Bb is a cylindrical portion that is connected to the inner surface of the flat plate portion 5Ba and protrudes toward the inside of the motor 1. A bearing 82 is fixed to the inner side of the protruding portion 5Bb by press fitting or the like.

[0018] The flange portion 5Bc is provided on the outer periphery of the flat plate portion 5Ba. The flange portion 53 of the housing body 5A and the flange portion 5Bc of the cover 5B are fixed together by fastening or the like, so that at least a portion of the opening of the housing body 5A is closed by the cover 5B.

[0019] The hole 5Bd is a circular hole provided in the flat plate portion 5Ba. The diameter of the hole 5Bd is smaller than the inner diameter of the protruding portion 5Bb. The axes of the flat plate portion 5Ba, the protruding portion 5Bb, and the hole 5Bd coincide with the rotation axis of the motor 1 (the axis of the shaft 2). The shaft 2 is rotatably supported by a bearing 82 near the end portion 2a relative to the cover 5B. The end portion 2a of the shaft 2 is inserted into the hole 5Bd and protrudes from the cover 5B.

[0020] The shaft 2 is generally cylindrical and has two ends 2a and 2b. The shaft 2 is rotatably supported by a bearing 82 (described later) near the end 2a on the upper side a relative to the cover 5B of the housing 5. The shaft 2 is also rotatably supported by a bearing 81 near the end 2b on the lower side b relative to the housing main body 5A of the housing 5. Thus, the shaft 2 is rotatably supported by the housing 5 via the bearings 81 and 82.

[0021] An end 2a of the shaft 2 protrudes from the cover 5B of the housing 5. The rotational force can be outputted to the outside from the end 2a of the shaft 2. The shaft 2 is fixed to the rotor 3, and when the rotor 3 rotates due to the electromagnetic action between the stator 4 and the rotor 3, the shaft 2 rotates together with the rotor 3.

[0022] The stator 4 is made up of a stator core 41 and coils 42. The stator core 41 is a laminate of magnetic material such as silicon steel plates. The stator core 41 is made up of an annular portion 44 arranged coaxially with the shaft 2, and teeth portions 43, which are multiple (e.g., 12) magnetic pole portions formed to extend from the annular portion 44 toward the shaft 2 side (inner peripheral side d). The outer periphery of 44 is fixed to the inner periphery of the cylindrical portion 51 of the housing main body 5A, and thus the stator 4 is fixed to the housing 5.

[0023] An insulator 45 serving as an insulating member is attached to the teeth 43 of the stator core 41, and the coil 42 is wound around the insulator 45 attached around each of the teeth 43. The stator core 41 and the coil 42 are insulated from each other by the insulator 45.

[0024] The rotor 3 has a rotor core 31 and a plurality of magnets 32. The rotor core 31 is formed by laminating a plurality of magnetic bodies. The rotor core 31 has a generally cylindrical shape. A plurality of slits (for example, 14 as shown in FIG. 2 ) are radially provided on the outer circumferential surface of the rotor core 31, penetrating from an end on one side (upper side a) to an end on the other side (lower side b) in the axial direction (axis x direction) of the rotor core 31. The magnets 32 are rectangular parallelepiped-shaped and fixed inside the slits. The number of magnets 32 matches the number of the slits.

[0025] In a cross section of the rotor 3 perpendicular to the axial direction (axis x direction), the cross sections of the multiple magnets 32 appear as rectangles (see FIG. 2). The longitudinal direction of the cross section of the multiple magnets 32 coincides with the radial direction cd of the rotor 3. The surfaces of the multiple magnets 32 on the long side of the cross section form magnetic pole faces. In addition, in the circumferential direction of the rotor 3, the opposing magnetic pole faces of adjacent magnets 32 have the same polarity. The shaft 2 is fixed to the inner peripheral surface of the rotor core 31.

[0026] A holding member 7 is disposed in the space between the cover 5B and the stator 4 within the housing 5. Fig. 3 is a perspective view of the motor 1 with the cover 5B of the housing 5 removed, as viewed obliquely from above. The retaining member 7 has a large ring portion 71 whose outer diameter is slightly smaller than the inner peripheral surface of the cylindrical portion 51, a small ring portion 72 whose diameter is smaller than the large ring portion 71, and a plurality of connecting portions 73 (only some of which are shown in FIG. 3) that connect the large ring portion 71 and the small ring portion 72. The large ring portion 71 and the small ring portion 72 are arranged on concentric circles with the shaft 2 as an axis.

[0027] The connecting portion 73 extends in a radial direction cd about the shaft 2. Two grooves 73c and 73d are provided on an upper side a of the connecting portion 73, side by side in the radial direction cd, and extend in the circumferential direction ef with a semicircular recessed shape toward a lower side b.

[0028] Fig. 4 is a perspective view of a holding member 7 provided in the motor 1. Fig. 5 is an enlarged vertical cross-sectional view of the motor 1.

[0029] As shown in Figs. 4 and 5, the holding member 7 is sandwiched between the cover 5B and the stator 4 in the axial direction. Specifically, the holding member 7 is sandwiched between the lower surface of the cover 5B and the insulator 45, which serves as an insulating member, provided on the stator 4 in the axial direction. In the holding member 7, the large ring portion 71 functions as a large annular portion, and the small ring portion 72 functions as a small annular portion. The holding member 7 is made of a resin having a lower rigidity than the metal cover 5B. The Young's modulus of the holding member 7 is lower than that of the cover 5B. The insulator 45 may be made of a material having a Young's modulus equal to or higher than that of the holding member 7.

[0030] The large ring portion 71 has a disk-shaped disk surface portion 111 centered on the axis. As shown in FIG. 4, the disk surface portion 111 is a surface facing either the upper or lower axial direction of the large ring portion 71. The upper axial direction disk surface portion 111 is a surface facing the lower surface of the cover 5B. The lower axial direction disk surface portion 111 is a surface facing the upper surface of the insulator 45. The plate surface portion 111 is provided with a protruding portion 107 that protrudes in the axial direction.

[0031] The protruding portion 107 protrudes axially upward from the disk surface portion 111 on the axially upper side. The planar shape of the protruding portion 107 is formed in an arc shape corresponding to the shape of the disk surface portion 111. The axial height (thickness) of the large ring portion 71 including the protruding portion 107 is greater than the height of the space between the lower surface of the cover 5B and the insulator 45. The protruding portion 107 is formed in a trapezoidal or approximately trapezoidal cross-sectional shape that converges from the disk surface portion 111 toward the end portion 112 on the axially upper side.

[0032] 5, in a state in which the opening 105 of the housing main body 5A is closed by the cover 5B, the end 112 of the protrusion 107 is in contact with the lower surface of the cover 5B. As described above, the axial height of the large ring portion 71, including the protrusion 107, is higher than the height of the space between the lower surface of the cover 5B and the insulator 45. Therefore, when the opening 105 is closed by the cover 5B, the end 112 of the protrusion 107 is crushed and deformed by the lower surface of the cover 5B. In other words, since the height of the protrusion 107 protruding in the axial direction is higher than the height of the space between the lower surface of the cover 5B and the insulator 45, the holding member 7 can fix the axial position inside the housing 5 without applying a load to the stator 4. In addition, since the retaining member 7 is fixed in its axial position, it is possible to prevent displacement even when it is subjected to force due to vibrations from the motor 1 or impacts from outside the housing main body 5A. In addition, since the retaining member 7 is in contact with the cover 5B, the stator 4, or both, it is possible to buffer forces generated by the motor 1 and external forces, and it is also possible to adjust the natural frequency of the motor 1 and prevent resonance.

[0033] The small ring portion 72 is formed with a smaller diameter than the teeth portion 43 so that it can be attached to the inner circumferential side d of the teeth portion 43 of the stator core 41. The small ring portion 72 has a disk-shaped disk surface portion 113 centered on the axis. As shown in FIG. 4, the disk surface portion 113 is a surface facing the axially upper or lower side of the small ring portion 72. The axially upper disk surface portion 113 is a surface facing the lower surface of the cover 5B. The axially lower disk surface portion 113 is a surface facing the upper surface of the insulator 45. The axially lower disk surface portion 113 of the small ring portion 72 is provided with a plurality of claw portions 114 extending to the axially lower side b in order to prevent the holding member 7 from rotating on the inner circumferential side d of the tube portion 51 when it is attached to the inner circumferential side d of the teeth portion 43. The claw portions 114 are provided at predetermined intervals in the circumferential direction of the small ring portion 72. The large ring portion 71 and the small ring portion 72 are each formed in an annular shape. The claw portions 114 are disposed between the teeth portions 43, and position the holding member 7 in the circumferential direction.

[0034] The power supply lines 6 are internal wiring of the motor 1 for guiding the lead wires of the coils 42 wound around the stator core 41 of the stator 4 to the outside of the motor 1 and connecting them to an external three-phase AC power source (not shown). Three power supply lines 6 extend along the inner circumferential surface of the large ring portion 71 of the retaining member 7 arranged inside the cylindrical portion 51 within the housing 5.

[0035] The three power supply lines 6 are power supply lines for the U-phase, V-phase, and W-phase coils 42 of the three-phase motor, and each lead-out portion 61 is connected to the lead-out of the corresponding phase coil 42. Hereinafter, the power supply lines 6 connected to the lead-outs of the U-phase, V-phase, and W-phase coils 42 are referred to as a power supply line 6U, a power supply line 6V, and a power supply line 6W, respectively.

[0036] Each power supply line 6 has a lead-out portion 61 consisting of a conductor wire branched into two, a lead-out portion 62 connected to a three-phase AC power supply, and a sleeve portion 63 electrically connecting the lead-out portion 61 and the lead-out portion 62. The lead-out portion 61 is connected to the lead-out wire of the coil 42. However, in Fig. 3, the two conductor wires of the lead-out portion 61 are not connected to the lead-out wire of the coil 42, and are shown in a cut state.

[0037] 6 is a plan view of the motor according to the embodiment of the present invention with the housing cover removed. However, for convenience, only two power feed lines 6 (6U) and 6 (6V) are shown, and power feed line 6 (6W) and other components are omitted. Lead wire portion 62 is a cylindrical coated conductor, and the inner conductor is coated with synthetic resin such as polyvinyl chloride. The outer diameter of lead wire portion 62 is approximately the same as the maximum width (corresponding to the diameter of the semicircle in this case) of grooves 73c and 73d formed in connecting portion 73 of holding member 7.

[0038] The lead wire portion 62 connects the sleeve portion 63 to an external three-phase AC power source, and is fitted into the groove 73c or 73d of the connecting portion 73 of the holding member 7. The outer diameter of the lead wire portion 62 and the maximum width of the grooves 73c, 73d of the connecting portion 73 do not necessarily have to be the same, and the outer diameter of the lead wire portion 62 may be slightly larger than the maximum width of the grooves 73c, 73d. In this case, the synthetic resin on the surface of the lead wire portion 62 is slightly crushed to fit into the grooves 73c, 73d.

[0039] The sleeve portion 63 is a member made of copper that electrically connects the lead-out wire portion 61 and the lead-out wire portion 62. Inside the sleeve portion 63, the lead-out wire portion 61 (two conductor wires) and the lead-out wire portion 62 (one conductor wire) are electrically connected by fusing (thermal compression bonding).

[0040] Furthermore, the sleeve portion 63 has two flat portions 63f formed along the circumferential direction ef by fusing (thermal compression bonding), and the sleeve portion 63 has a flat shape as a whole. The maximum width of the flat portion 63f in the radial direction is larger than the outer diameter of the cylindrical lead-out wire portion 62 and is also larger than the maximum width (corresponding to the diameter of the semicircle in this case) of the semicircular grooves 73c, 73d provided in the connecting portion 73 of the holding member 7.

[0041] Furthermore, the sleeve portion 63 is disposed so that the surface of the upper side a of the connecting portion 73 faces the flat surface of the flat portion 63f. As a result, even if the output line portion 62 of the power supply line 6 is pulled, the flat portion 63f of the sleeve portion 63 is caught in the grooves 73c, 73d formed in the connecting portion 73 of the holding member 7, and therefore is not pulled any further, thereby preventing breakage of the conductor of the output line portion 61.

[0042] The lead wire portion 62 is drawn out to the outside of the motor 1 and connected to a three-phase AC power source. As shown in Fig. 3, the lead wire portion 62 extends from the sleeve portion 63 to the grommet 64 and is drawn out to the outside of the motor 1. The lead wire portion 62 extending along the inner circumferential surface of the large ring portion 71 of the holding member 7 is fitted into either one of the grooves 73c, 73d of the connecting portion 73. Since the lead wire portion 62 is fitted into the groove 73c or 73d of the connecting portion 73 of the holding member 7, the lead wire portion 62 and the sleeve portion 63 of the power supply line 6 are not in contact with the stator 4 present below the holding member 7.

[0043] Taking the power feeder 6U as an example, the output wire portion 62 extending in the counterclockwise direction f from the sleeve portion 63 is fitted into a groove 73c of a coupling portion 73A located near the sleeve portion 63. The output wire portion 62 continues to extend in the counterclockwise direction f along the inner circumferential surface of the large ring portion 71 of the holding member 7, and is fitted into a groove 73d of a coupling portion 73B adjacent to the coupling portion 73A.

[0044] Furthermore, the output wire portion 62 extends in the counterclockwise direction f along the inner circumferential surface of the large ring portion 71 of the holding member 7, and is fitted into a groove 73d on the inner circumferential side d of a connecting portion 73C (see FIG. 1) provided next to the connecting portion 73B. In the connecting portion 73C, the output wire portion 62 of the power supply line 6V is fitted into a groove 73c on the outer circumferential side c.

[0045] The power supply lines 6U and 6V have their output wire portions 62 held by grommets 64 and raised in the upward direction a to be drawn out to the outside of the motor 1. The same is true for the power supply line W. While being appropriately fitted into the grooves 73c, 73d of the connecting portion 73, it extends in the clockwise direction e along the inner surface of the large ring portion 71 of the retaining member 7, is held by the grommet 64, and is raised upward in the direction a, and is pulled out to the outside of the motor 1. The grommet 64 also holds lead wires 91 that connect to sensors (not shown) disposed inside the motor 1, such as a rotational position sensor and a temperature sensor, and these lead wires are led out to the outside of the motor 1.

[0046] Here, the layout of the conductor wires drawn out from both ends of the coil 42 (lead wire 421 and crossover wire 422, which will be described later) will be described. FIG. 7 is a top view of the stator 4 included in the motor 1 according to this embodiment, and is a diagram for explaining the layout of the lead wires 421 and the crossover wires 422 drawn out from the coils 42. As shown in FIG.

[0047] A coil 42 is wound around an insulator 45 attached around each of the teeth 43 of the stator core 41. One of the conductor wires drawn from both ends of the coil 42 serves as a crossover wire 422 and is connected to another coil 42, and the other serves as a crossover wire 422 or a lead wire 421. The other crossover wire 422 is further connected to another coil 42, and the lead wire 421 is connected to the lead wire portion 61 of the corresponding phase power supply line 6U, 6V, 6W as described above (see FIG. 3). Hereinafter, the layout of the lead wire 421 (the lead wire 421x) and the crossover wire 422 (the crossover wire 422x) drawn from both ends of a specific coil 42 (coil 42x in FIG. 7) from which the lead wire 421 is drawn out from one end will be described.

[0048] 8 is an enlarged perspective view from above of the coil 42x and its surroundings in the stator 4. One end of the conductor drawn out from both ends of the coil 42x serves as a crossover 422x and is connected to another coil 42, and the other end serves as a lead wire 421x. The lead wire 421x is connected to the beginning of the winding of the coil 42x, and the end of the winding of the coil 42x is connected to the crossover 422x.

[0049] The insulator 45 has a wall portion 453 on an outer side c in the radial direction cd, which protrudes to an upper side a in the direction of the axis x and extends in the circumferential direction ef. The wall portion 453 has two grooves, one above the other, extending in the circumferential direction ef on the outer side in the radial direction cd (hereinafter, the groove on the upper side a is referred to as the "upper groove 453a" and the groove on the lower side b is referred to as the "lower groove 453b"). The crossover wire 422 is disposed in either the upper groove 453a or the lower groove 453b and extends in the circumferential direction ef. The crossover wire 422 connects the coils 42 of the teeth portion 43 that are separated by several (three in this embodiment) in the circumferential direction ef.

[0050] In this embodiment, the crossover wire 422x connected to the coil 42x is disposed in the upper groove 453a and extends in the clockwise direction e as shown in Fig. 8. The crossover wire 422x is connected to the coil 42 (having the same U, V, and W phases as the coil 42x) of the tooth portion 43 that is three teeth away from the coil 42x in the clockwise direction e.

[0051] A crossover wire 422y that connects coils 42 of the same phase different from the coils 42x is arranged in the lower groove 453b directly below the upper groove 453a in which the crossover wire 422x is arranged, and extends on both sides in the circumferential direction ef. On the other hand, the lead wires 421x connected to the coils 42x (not shown) are raised toward the upper side a and, as described above, are connected to the lead wire portions 61 of the power supply lines 6U, 6V, 6W of the corresponding phases (not shown).

[0052] The insulator 45 has the coil 42 wound around the tooth portion 43, but has a wall portion 453 on the radially outer side c where the coil 42 is not wound. The wall portion 453 is formed discontinuously in the circumferential direction ef, and the discontinuous region W (FIGS. 7 and 8) is a region where the coil 42 is wound. A crossover wire 422 connected to the coil 42 is led out to an upper groove 453a and a lower groove 453b on the outside of the wall portion 453 via a wire 422a and a wire 422b.

[0053] The insulator 45 has, on the radial outer side c, a protrusion 451 protruding from a position where the crossover wire 422 extends in the direction of the axis x (in FIG. 8, the inner wall surface of the lower side b of the lower groove 453b) and a recess 452 recessed from the position where the crossover wire 422 extends (as described above). The protrusion 451 and the recess 452 are adjacent to each other in the circumferential direction ef.

[0054] A longitudinal cross-sectional view of the QQ cross section in Fig. 8 is shown in Fig. 9, and a sectional perspective view of the same QQ cross section is shown in Fig. 10. Also, a longitudinal cross-sectional view of the PP cross section in Fig. 8 is shown in Fig. 11. Although the cutting positions of Fig. 9 and Fig. 11 are slightly different (see PP and QQ in Fig. 8), they show cross sections cut at almost the same positions, but viewed from 180° opposite directions.

[0055] As shown in Figures 8 to 10, a lead wire 421x connected to the beginning of the winding of the coil 42x rises from the lower side b, is bent along the way, and extends from the radial inner side d to the radial outer side c, with its end being disposed in a recess 452. 8 and 11, the crossover wire 422y connecting the coils 42 of a different phase from the coil 42x is disposed on the inner side d of the protruding portion 451 in the radial direction cd. That is, the crossover wire 422y disposed in the lower groove 435b and extending in an arc in the circumferential direction ef is disposed on the inner side d of the protruding portion 451 in the region Wx (see FIG. 8), and thus recedes from the arc extending in the circumferential direction ef to the inner side d.

[0056] The lead wire 421x is disposed between the insulator 45 and the crossover wire 422y in the recess 452. In the recess 452, the lead wire 421x faces toward the radially outer side c, and then rises in a direction away from the recess 452 in the axial x direction (toward the upper side a). At this time, the lead wire 421x rises through a portion where the crossover wire 422y retreats from the arc toward the inner side d, and interference between the lead wire 421x and the crossover wire 422y is avoided at that portion.

[0057] Generally, when winding a coil, whether by machine or by hand, the starting end of the winding is held (fixed) by some means on the outer periphery (c) of the annular portion (44) of the stator core (41 in this embodiment) and then wound around the teeth (43). At this time, the tip of the starting end of the winding is held in a position protruding from the annular portion (44).

[0058] Then, the wire is wound around another tooth (43) via a jumper (422), to form a wound coil (42). The other end of the winding is connected to the other end of the winding of the coil (42) of the other phase, for example, in the case of a Y-connected (star-connected) three-phase motor.

[0059] The starting end of the coil (42) wound in the above manner becomes the lead wire (421), but when the winding is completed, it protrudes from the annular portion (44). In order to connect to the power supply line (6) inside the motor (1) in this state, the lead wire (421) protruding from the annular portion (44) must be pulled into the motor (1).

[0060] However, the lead wire (421) is crossed by the crossover wire (422) immediately above (a). Therefore, in order to avoid the crossover wire (422) that extends in a circumferential direction (cd) in an arc outside the insulating member (insulator 45) and raise the lead wire (421) to the upper side (a) and pull it into the motor (1), the lead wire (421) must first be It will have to be protruded (c) outside the annular portion (44).

[0061] In contrast, in this embodiment, the insulator 45 has a protruding portion 451, and the crossover wire 422y is disposed on the inner side d of the protruding portion 451, so that the crossover wire 422y is recessed from the arc extending in the circumferential direction ef to the inner side d. Therefore, the crossover wire 422y is not present directly above the lead wire 421 on the radially outer side c of the recessed portion 452.

[0062] Therefore, when the winding of the coil 42 is completed, even if the lead wire 421x that passes through the recess 452 and protrudes from the annular portion 44 is raised in a direction away from the recess 452 in the axial x direction (upper side a) on the radial outer side c of the recess 452, it does not interfere with the crossover wire 422y. Therefore, the lead wire 421 does not protrude beyond the outer side c of the annular portion 44 of the stator core 41.

[0063] Therefore, according to the motor 1 of this embodiment, there is no need to set the outer diameter taking into account the portion of the lead wire 421 protruding from the annular portion 44 (i.e., there is no need to ensure a gap for the protruding lead wire 421 between the annular portion 44 of the stator core 41 and the tubular portion 51 of the housing body 5A), and the motor 1 can be made smaller (reduced in diameter).

[0064] In particular, when a thick conductor wire, for example, about 1 mm, is used as the winding of the coil, the crossover wire 422 extending in the circumferential direction ef and the lead wire 421x protruding from the annular portion 44 after winding are likely to interfere with each other, and the amount of protrusion of the lead wire 421 to the outside c when it protrudes from the annular portion 44 also becomes large. Therefore, when the winding of the coil is thick, the configuration related to the recessed portion 452 and the protruding portion 451 in this embodiment is useful. Note that the lead wire 421y of the adjacent coil 42 is arranged next to the lead wire 421x and rises from the other side in the axial direction (axis x direction) to one side (upper side a) (see FIG. 8).

[0065] 9 and 10, the lead-out wire 421x raised at the radially outer side c of the recess 452 curves while avoiding the crossover wire 422y extending in the circumferential direction ef, and then extends toward the radially inner side d. The lead-out wire 421x then rises again toward the upper side a at a position further radially inner d than the crossover wire 422y arranged at the radially inner side d of the protrusion 451. Although not shown beyond that, the lead-out wire 421x is connected to the lead-out wire portion 61 of the power supply line 6U, 6V, 6W of the corresponding phase (see FIG. 3).

[0066] The configuration of the insulator 45 in this embodiment is merely an example, and the present invention is not limited to the configuration of this embodiment. For example, in this embodiment, two grooves (upper groove 435a and lower groove 435b) are provided on the outer periphery of the insulator 45, one above the other, but it may be one or three or more. In a three-phase motor with Y connection, it is preferable that there are two grooves, but for other types of motors, the preferable number of grooves will change. Also, as long as there is an outer periphery structure that can guide the crossover wires in the circumferential direction, it may be a configuration without any grooves.

[0067] [Variations] Next, modified examples of the motor of the present invention described above will be described. In the following, components having the same or similar functions as those of the motor 1 according to the above embodiment will be given the same reference numerals and their description will be omitted, and only the different components will be described.

[0068] Fig. 12 is a vertical cross-sectional view of a motor 1B according to a modified example of the embodiment of the present invention, Fig. 13 is a perspective view of a holding member 7B included in the motor 1B, and Fig. 14 is an enlarged vertical cross-sectional view of the motor 1B.

[0069] In the motor 1 described above, the protrusion 107 of the holding member 7 is provided on the disk surface portion 111 on the axial upper side of the large ring portion 71. On the other hand, as shown in Figs. 13 and 14, in the motor 1B of the modified example, the protrusion 107B of the holding member 7B is provided on the disk surface portion 113B on the axial upper side of the small ring portion 72B. The protrusion 107B is configured so that the axial height (thickness) of the small ring portion 72B including the protrusion 107B is higher than the height of the space between the lower surface of the cover 5B and the insulator 45. In addition, the motor 1B differs from the holding member 7 of the motor 1 described above in that no groove is provided in the multiple connecting portions 73B that connect the large ring portion 71B and the small ring portion 72B.

[0070] 13 and 14, the holding member 7B holds a circuit board 101 on the inner circumferential side of the small ring portion 72B. The circuit board 101 is fixed to the holding member 7B, for example, by fastening a screw 104 to a screw hole 106 provided in the holding member 7B. The circuit board 101 is mounted with electronic components (not shown), such as a magnetic pole sensor.

[0071] As with the retaining member 7 described above, when the opening 105 of the retaining member 7B is blocked by the cover 5B, the end 112B of the protrusion 107B is crushed by the lower surface of the cover 5B. In other words, the height of the protrusion 107B protruding in the axial direction of the retaining member 7B is higher than the height of the space between the lower surface of the cover 5B and the insulator 45B, so that the axial position of the retaining member 7B can be fixed without applying a load to the stator 4 inside the housing 5. In addition, even if the retaining member 7B receives some force, such as a force from the motor 1B, the axial position of the retaining member 7B is fixed, so that it is possible to prevent positional displacement.

[0072] 12 and 13, the holding member 7B has a hole 103 in the large ring portion 71B. A pin 102 serving as a fixing member for fixing the holding member 7B and the insulator 45B is inserted into the hole 103. The pin 102 is provided on the insulator 45B. By inserting the pin 102 into the hole 103 to fix the holding member 7B and the insulator 45B, the motor 1B can position the holding member 7B in the rotation direction of the motor 1B.

[0073] Note that the holding member 7B may also be provided with the above-mentioned grooves 73c, 73d in the connecting portion 73B. This allows the lead wire portion 62 to be fitted into the grooves 73c, 73d of the connecting portion 73B in the holding member 7B, so that even if the lead wire portion 62 is pulled, the flat portion 63f of the sleeve portion 63 gets caught in the grooves 73c, 73d of the connecting portion 73B, preventing breakage of the conductor of the lead wire portion 61.

[0074] In addition, those skilled in the art can appropriately modify the motor of the present invention in accordance with conventionally known knowledge. As long as the motor of the present invention is still provided after such modification, it is of course included in the scope of the present invention. [Explanation of symbols]

[0075] 1...motor, 2...shaft, 2a, 2b...end, 3...rotor, 31...rotor core, 32...magnet, 4...stator, 41...stator core, 42, 42x...coil, 43...teeth portion, 44...annular portion, 45...insulator (insulating member), 5...housing, 5A...housing body, 5B...cover, 5Ba...flat plate portion, 5Bb...projection portion, 5Bc...flange portion, 5Bd...hole portion, 51...tubular portion, 52...bottom portion, 52a...bottom surface portion, 52b...projection portion, 53...flange 1, 6 ... power supply line, 61 ... lead wire portion, 62 ... lead wire portion, 63 ... sleeve portion, 63f ... flat portion, 64 ... grommet, 7, 7B ... holding member, 71, 71B ... large ring portion, 72, 72B ... small ring portion, 73, 73B ... connecting portion, 73c, 73d ... groove, 81, 82 ... bearing, 91 ... lead wire, 101 ... circuit board, 102 ... pin, 103 ... hole, 104 ... screw, 105 ... opening, 106 ... screw hole, 107, 107B ... protruding portion, 111, 111B, 113, 113 B...disk surface portion, 112...end portion, 114...claw portion, 421, 421x, 421y...lead line, 422, 422x, 422y...crossover line, 451...projection portion, 452...recess, 453...wall portion, 453a...upper groove (groove), 453b...lower groove (groove)

Claims

1. A shaft, A rotor fixed to the shaft; a stator core facing the rotor; an insulating member attached to the stator core; A coil wound around the insulating member; Equipped with A jumper wire connected to an end of the coil is disposed on a radially outer side of the insulating member and extends in a circumferential direction, The insulating member has, on a radially outer side, a convex portion that protrudes radially inward in the axial direction from a position where the jumper wire extends, and a concave portion that is recessed from the position where the jumper wire extends, A lead wire connected to the beginning of the coil is disposed in the recess, A portion of the crossover wire disposed in the recess is recessed radially inward, In the radial direction, the lead wire passes radially outside a part of the retracted crossover wire, a portion of the crossover wire that is retracted in the radial direction is disposed inside the protrusion.

2. The lead wire is disposed between the insulating member and the jumper wire in the recess.

2. The motor according to claim 1 .

3. The insulating member has a wall portion on a radially outer side, the wall portion protruding in an axial direction and extending in a circumferential direction, The wall portion has one or more grooves extending in a circumferential direction on a radially outer side thereof, The motor according to claim 1 , wherein the crossover wire is disposed in the groove.

4. The motor according to any one of claims 1 to 3, wherein the recessed portion and the protruding portion are adjacent to each other in a circumferential direction.

5. The motor according to any one of claims 1 to 4, wherein the lead wire connected to the beginning of the winding of the coil extends radially outward in the recess and rises in a direction away from the recess in the axial direction.

Images