JP2023150342A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine which can be contributed to reduce a cost.SOLUTION: A rotary electric machine includes: a rotational shaft that is extended to a shaft direction; a motor unit 1 that includes a rotor fixed to a peripheral surface of the rotational shaft and an annular stator arranged to the circumference of the rotor; a cylinder case 10 of which one side of the shaft direction is opened, and that houses the motor unit; a step part that is provided along a peripheral direction to an inner wall of the cylinder case 10, and is directed to one side of the shaft direction; a groove part 17 that is provided to the step part, and is extended to an outer side of a radial direction from an inner side of the radial direciton; a coil wire 73a that is led from the stator, and of which one part is housed into the groove part 17; an annular guide member 60 that includes a convex part 63 projected to the other side of the shaft direction, and entered into the groove part 17, and is arranged to the step part; and a control board 80 that includes a through hole 81 into which an end part of the coil wire is passed. The coil wire 73a is nipped by the groove part 17 and the convex part 63, and is extended to the through hole 81 while passing through a gap between the inner wall 14 and the guide member 60 so that the end part side is along the shaft direction.SELECTED DRAWING: Figure 7

Description

The present invention relates to a rotating electric machine.

2. Description of the Related Art Rotating electric machines equipped with a motor having a rotor and a stator are known. For example, Patent Document 1 discloses a motor in which a coil wire drawn out from a stator core is connected to a control board via a busbar member.

International Publication No. 2018/168090

In addition to the busbar members, injection molded parts, terminal parts, resin members, etc. are used, which increases the number of parts and increases costs.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a rotating electric machine that can contribute to cost reduction.

One aspect of the rotating electric machine of the present invention includes a motor unit having a rotating shaft extending in the axial direction, a rotor fixed to the circumferential surface of the rotating shaft, and an annular stator disposed around the rotor; a cylindrical case having an open side and accommodating the motor unit; a step provided along the circumferential direction on the inner wall of the cylindrical case and facing one side in the axial direction; and a step provided in the step and radially inward. a groove portion extending radially outward from the stator; a coil wire pulled out from the stator and partially housed in the groove portion; and a protruding portion protruding toward the other side in the axial direction and entering the groove portion, and disposed in the step portion. and a substrate having a through hole through which the end of the coil wire passes, and the coil wire is sandwiched between the groove and the protrusion, and the end side is axially oriented. The guide member extends along the line through the gap between the inner wall and the guide member to the through hole.

According to one aspect of the present invention, it is possible to provide a rotating electric machine that contributes to cost reduction.

FIG. 1 is a sectional view showing a rotating electrical machine according to this embodiment. FIG. 2 is a perspective view showing the cylindrical case of this embodiment. FIG. 3 is a partial perspective view of the periphery of the step portion and groove portion of this embodiment. FIG. 4 is a perspective view of the guide member of this embodiment viewed from below. FIG. 5 is an enlarged plan view of the periphery of the semi-cylindrical wall of this embodiment. FIG. 6 is a diagram of the groove portion and the protruding portion of this embodiment viewed from the inside in the radial direction. FIG. 7 is a longitudinal sectional view of the periphery of the protruding portion of this embodiment.

Each figure hypothetically shows a central axis J in a rotating electric machine of an embodiment described below.
In the following description, the axial direction of the central axis J will be simply referred to as the "axial direction." The radial direction centered on the central axis J is simply referred to as the "radial direction." The circumferential direction centered on the central axis J is simply referred to as the "circumferential direction." The Z axis shown in each figure indicates the direction in which the central axis J extends. In the following explanation, the side of the axis that the Z-axis arrow points to (+Z side) is referred to as the "upper side," and the side of the axis that is opposite to the direction of the Z-axis arrow (-Z side) is referred to as the "lower side." It is called "side".

In this embodiment, the lower side corresponds to "one side in the axial direction" and the upper side corresponds to "the other side in the axial direction." Note that "upper side" and "lower side" are simply names used to explain the relative positional relationship of each part, and the actual positional relationship may be other than that indicated by these names. . Further, in FIG. 1, for the purpose of explanation, cross sections are shown at different positions in the circumferential direction on both left and right sides of the central axis J.

As shown in FIG. 1, the rotating electrical machine 100 includes a motor unit 1, a cylindrical case 10, a lid 20, a motor housing 30, and a guide member 60.
The motor unit 1 includes a rotating shaft 40, a rotor 50, a stator 70, and a control board 80.

The rotating shaft 40 has a cylindrical shape that extends in the axial direction centering on the central axis J. The rotating shaft 40 is rotatably supported around a central axis J by bearings 5a and 5b. The rotor 50 is rotatable around the central axis J. The rotor 50 is fixed to the circumferential surface of the rotating shaft 40. The rotor 50 has a rotor core 51 and a magnet 52. The rotor core 51 has an annular shape surrounding the central axis J. The rotary shaft 40 is passed through the rotor core 51 in the radial direction inside thereof in the axial direction. Magnet 52 is fixed to rotor core 51. Although not shown, for example, a plurality of magnets 52 are provided at intervals in the circumferential direction.

Stator 70 is located on the outside of rotor 50 in the radial direction. Stator 70 is arranged around rotor 50 . Stator 70 is annular and surrounds rotor 50 . Stator 70 includes a stator core 71, an insulator 72 attached to stator core 71, and a plurality of coils 73 attached to stator core 71 via insulator 72.

Stator core 71 surrounds rotor core 51. The stator core 71 includes an annular core back 71a surrounding the rotor core 51, and a plurality of teeth extending radially inward from the core back 71a, although not shown. The plurality of teeth are arranged side by side along the circumferential direction. A portion of the core back 71a excluding the upper end is press-fitted into the motor housing 30 and fixed. Thereby, the stator 70 is fixed to the motor housing 30. The radially inner ends of the plurality of teeth face the outer circumferential surface of the rotor 50 with a slight gap therebetween. That is, in this embodiment, the stator 70 is disposed in a non-contact state with the outer peripheral surface of the rotor 50. Insulator 72 and coil 73 protrude from stator core 71 on both sides in the axial direction.

Control board 80 is arranged above rotor 50 and stator 70 . The control board 80 is positioned in the cylindrical case 10 by fitting into the fitting protrusion 14c (details will be described later). As shown in FIG. 1, one ends of a plurality of terminals 83 are connected to the control board 80. Although not shown, the other ends of the plurality of terminals 83 are provided in the connector portion 19. By connecting an external power source (not shown) to the connector portion 19, power from the external power source is supplied to the control board 80 from the terminal 83. The control board 80 has a plurality of through holes 81 passing through in the axial direction. The end of the coil wire 73a drawn out from the stator 70 is passed through the through hole 81 (details will be described later). The control board 80 is electrically connected to the coil 73 by passing the coil wire 73 a through the through hole 81 . Power supplied to the control board 80 from an external power source (not shown) is supplied to the coil 73 via the coil wire 73a.

The cylindrical case 10 is located below the lid 20. The cylindrical case 10 has a cylindrical shape with an open upper side. In this embodiment, the cylindrical case 10 is made of resin. As shown in FIG. 2, the cylindrical case 10 includes a bottom wall portion 11, an outer peripheral wall 12, an inner wall 14, a step portion 16, a groove portion 17, an inner wall coil wire guide groove 18, a connector portion 19, has. The bottom wall portion 11 has an annular shape surrounding the central axis J. The bottom wall portion 11 is located below the stator 70.

The outer peripheral wall 12 has a cylindrical shape extending upward from the edge of the bottom wall portion 11 . The upper surface of the outer peripheral wall 12 is a joint surface to which the lid 20 is joined. The upper surface of the outer peripheral wall 12 has a groove 12a. The groove 12a is provided all around the circumference. Although not shown, a sealing material is provided in the groove 12a. The outer peripheral wall 12 has a projecting wall 13. The projecting wall 13 projects radially outward from the outer peripheral wall 12. A plurality of projecting walls 13 (six in FIG. 2) are arranged at intervals in the circumferential direction. The projecting wall 13 has a cavity 13a that opens upward. The cavity 13a extends in the axial direction. With the sealing material provided in the groove 12a, the cylindrical case 10 and the lid 20 can be fixed in a sealed state by screwing the tapping screw 13b (see FIG. 1) into the cavity 13a from above through the lid 20. . A connector portion 19 is provided on the outer peripheral wall 12.

The inner wall 14 projects upward from the bottom wall portion 11. More specifically, the inner wall 14 projects upward from the radially outer peripheral edge of the bottom wall portion 11 . The inner wall 14 has an annular shape surrounding the central axis J. As shown in FIG. 1, the inner wall 14 is located on the radially outer side of the stator 70. The inner wall 14 surrounds the stator 70 from the outside in the radial direction. The inner wall 14 is located radially inward than the outer peripheral wall 12. The upper surface of the inner wall 14 is located below the upper surface of the outer peripheral wall 12.

A fitting protrusion 14c is provided between the outer peripheral wall 12 and the inner wall 14 in the radial direction. A plurality of fitting projections 14c (six in FIG. 2) are arranged at intervals in the circumferential direction. The fitting protrusion 14c projects upward. The fitting protrusion 14c is connected to the outer circumferential wall 12 and the inner wall 14 by a rib 14d extending in the radial direction. The rib 14d projects upward from the bottom wall portion 11. Although not shown, the fitting protrusion 14c positions the control board 80 by fitting into the through hole of the control board 80.

A plurality of step portions 16 are provided on the inner wall 14 along the circumferential direction. Three stepped portions 16 are provided at intervals in the circumferential direction, corresponding to the U phase, V phase, and W phase of the coil wire 73a. The stepped portion 16 faces upward. As shown in FIG. 3, two grooves 17 are provided in one step 16 in parallel in the circumferential direction. The groove portions 17 each extend from the radially inner side to the radially outer side. A portion of the coil wire 73a drawn out from the stator 70 is accommodated in the groove 17. A semi-cylindrical wall 16A extending upwardly protrudes from the radially outer side of the step portion 16. The surface of the semi-cylindrical wall 16A facing inward in the radial direction is a plane perpendicular to the radial direction. The inner wall coil wire guide groove 18 is provided on a surface of the semi-cylindrical wall 16A facing radially inward, and faces radially outward and inward. That is, the inner wall coil wire guide groove 18 is arranged on the radially outer side of the stepped portion 16 in the inner wall 14 . The inner wall coil wire guide groove 18 extends in the axial direction. The inner wall coil wire guide groove 18 is connected to the outer side of the groove portion 17 in the radial direction. When viewed in the axial direction, the inner wall coil wire guide groove 18 has a semicircular shape. The inner wall coil wire guide groove 18 faces the through hole 81 of the control board 80 in the axial direction.

As shown in FIG. 1, the lid 20 is placed above the cylindrical case 10. The lid body 20 has a disc shape. The lid body 20 closes the opening of the cylindrical case 10 via the above-described sealing material. In this embodiment, the lid body 20 is made of metal. The material constituting the lid body 20 is, for example, iron. The lid body 20 is made, for example, by pressing a sheet metal member. That is, in this embodiment, the lid body 20 is a pressed product.

As shown in FIG. 4, the guide member 60 includes a disk portion 61, a snap fit 62, a protruding portion 63, and a circumferential coil wire guide groove 64. The disk portion 61 has an annular shape centered on the central axis J. The disk portion 61 is arranged above the stepped portion 16. As shown in FIG. 5, the outer circumferential surface of the disk portion 61 faces the surface of the semi-cylindrical wall 16A facing radially inward from the radially inner side with a gap therebetween.

The snap fit 62 extends downward from the inner edge of the disc portion 61. A plurality of snap fits 62 (six in FIG. 4) are arranged at intervals in the circumferential direction. Although not shown, the snap fit 62 is caught on the outside of the insulator 72 in the radial direction. By each of the plurality of snap fits 62 being caught on the radially outer side of the insulator 72, the guide member 60 is fixed in a positioned state on the cylindrical case 10 via the stator 70.

The protruding portion 63 protrudes downward from the disk portion 61. The protruding portion 63 has a thin plate shape extending in the radial direction. A plurality of protrusions 63 (six in FIG. 4) are arranged at intervals in the circumferential direction. The protruding portions 63 each face the groove portion 17 in the axial direction. The circumferential width of the protruding portion 63 is shorter than the circumferential width of the groove 17 . As shown in FIG. 6, the protruding portion 63 enters the groove portion 17 from above. The axial position of the lower end of the protruding portion 63 is above the bottom portion located at the uppermost side of the groove portion 17 . Therefore, there is a gap between the protruding strip 63 that has entered the groove 17 and the bottom of the groove 17. The coil wire 73a drawn out from the stator 70 is sandwiched between the protruding portion 63 and the groove portion 17 and accommodated therein.

The circumferential coil wire guide groove 64 is provided on the circumferential surface 61 a adjacent to the radially outer side of the protruding strip 63 . The circumferential coil wire guide groove 64 extends along the axial direction. When viewed in the axial direction, the circumferential coil wire guide groove 64 has a semicircular shape recessed radially inward from the circumferential surface 61a. The circumferential coil wire guide groove 64 faces the inner wall coil wire guide groove 18 in the radial direction. As shown in FIG. 7, the circumferential coil wire guide groove 64 faces the through hole 81 of the control board 80 in the axial direction. The end of the coil wire 73a passes through the gap between the inner wall 14 and the guide member 60 along the axial direction. The end side of the coil wire 73a passes through the gap between the inner wall coil wire guide groove 18 and the circumferential surface coil wire guide groove 64 along the axial direction. The coil wire 73a is positioned in a plane perpendicular to the axial direction by passing through the gap between the inner wall coil wire guide groove 18 and the circumferential surface coil wire guide groove 64. The end of the coil wire 73a positioned in a plane perpendicular to the axial direction is pulled out from the gap between the inner wall coil wire guide groove 18 and the circumferential surface coil wire guide groove 64, extends to the through hole 81, and is inserted.

Before the guide member 60 is attached to the cylindrical case 10, the coil wire 73a drawn out from the stator 70 is accommodated in the groove portion 17 along the radial direction, and is along the inner wall coil wire guide groove 18. When placing the guide member 60 on the step portion 16, the coil wire 73a along the inner wall coil wire guide groove 18 is made to run along the circumferential surface coil wire guide groove 64. The coil wire 73a accommodated in the groove portion 17 is held on both sides in the circumferential direction by the stepped portion 16, but the coil wire 73a along the inner wall coil wire guide groove 18 is not sufficiently held in the circumferential direction. Therefore, when placing the guide member 60 on the step portion 16, the position of the coil wire 73a along the inner wall coil wire guide groove 18 is maintained using a jig or the like. It can improve assembly work.

As described above, according to the rotating electrical machine 100 of the present embodiment, when the cylindrical case 10 is provided with the groove 17 that also serves as a guide for positioning the coil wire 73a, and the guide member 60 is arranged in the cylindrical case 10, By sandwiching and fixing the coil wire 73a between the cylindrical case 10 and the guide member 60, the coil wire 73a can be easily positioned at the connection position of the control board 80. Therefore, according to the rotating electrical machine 100 of the present embodiment, the coil wire 73a can be easily connected to the control board 80 using a minimum number of members, which can contribute to cost reduction and improvement of workability.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. The various shapes and combinations of the constituent members shown in the above example are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

The use of the rotating electric machine to which the present invention is applied is not particularly limited. The rotating electrical machine may be mounted on any type of equipment. The rotating electric machine may be mounted on an actuator that includes a speed reduction mechanism. The rotating electric machine may be a generator. The use of the pump to which the present invention is applied is not particularly limited. The pump may be mounted on any device. The pump may be mounted on a vehicle, for example. The pump may be any fluid pump. The pump may be an oil pump that pumps oil. Note that the configurations described above in this specification can be combined as appropriate within a mutually consistent range.

DESCRIPTION OF SYMBOLS 1... Motor unit, 10... Cylindrical case, 14... Inner wall, 16... Step part, 17... Groove part, 18... Inner wall coil wire guide groove, 40... Rotating shaft, 50... Rotor, 60... Guide member, 61a... Circumferential surface , 64...Surrounding surface coil wire guide groove, 70...Stator, 73a...Coil wire, 80...Control board, 81...Through hole, 100...Rotating electric machine, J...Center shaft

Claims (4)

a motor unit having a rotating shaft extending in an axial direction, a rotor fixed to a circumferential surface of the rotating shaft, and an annular stator disposed around the rotor;
a cylindrical case that is open on one axial side and houses the motor unit;
a stepped portion provided along the circumferential direction on the inner wall of the cylindrical case and facing toward one side in the axial direction;
a groove provided in the step portion and extending from a radially inner side to a radially outer side;
a coil wire pulled out from the stator and partially accommodated in the groove;
an annular guide member disposed in the stepped portion and having a convex portion that protrudes toward the other side in the axial direction and enters the groove portion;
a substrate having a through hole through which the end of the coil wire passes;
has
In the rotating electric machine, the coil wire is sandwiched between the groove portion and the protruding portion, and an end portion thereof extends along the axial direction through a gap between the inner wall and the guide member to the through hole. The guide member has a circumferential coil wire guide groove along the axial direction on a circumferential surface adjacent to the radially outer side of the protruding portion.
The rotating electric machine according to claim 1. An inner wall coil wire guide groove is provided on the radially outer side of the stepped portion in the inner wall and faces radially outwardly and inwardly along the axial direction.
The rotating electric machine according to claim 1 or 2. the inner wall coil wire guide groove is axially opposed to the through hole;
The rotating electric machine according to claim 3.

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