Rotating electric machine

Abstract

To provide a rotary electric machine which can be contributed to reduce a cost.SOLUTION: A rotary electric machine includes: a rotational shaft 40 that is extended to a shaft direction; a motor unit 1 that includes a rotor 50 fixed to a peripheral surface of the rotational shaft 40 and an annular stator 70 arranged to the circumference of the rotor 50; 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 coil wire 73a that is led from the stator 70; a guide member 60 that is an annular guide member 60 arranged to the step part, and includes a notch part 63 extended toward an inner side of a radial direction from an outer side of the radial direction; and a control board 80 that includes a through hole 81 into which an end part of the coil wire 73a is passed. On at least one side of a peripheral direction in the notch part 63, an elastic deformation part which can be moved to the peripheral direction is included. The coil wire 73a led from the stator 70 is extended to the through hole 81 passing through the notch part 63 so that an end part side is along the shaft direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rotating electric machine.

Background Art

[0002] A rotating electric machine provided with a motor having a rotor and a stator is known. For example, Patent Document 1 discloses a motor in which a coil wire drawn from a stator core is connected to a control board via a bus bar member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since injection-molded parts, terminal parts, resin members, etc. are used in addition to the bus bar member, the number of parts increases, leading to an increase in cost.

[0005] The present invention has been made in consideration of the above points, and an object thereof is to provide a rotating electric machine that can contribute to cost reduction.

Means for Solving the Problems

[0006] One embodiment of the rotating electric machine of the present invention comprises 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 arranged around the rotor; a cylindrical case having an opening on one side in the axial direction and housing the motor unit; a stepped portion provided along the circumferential direction on the inner wall of the cylindrical case and facing one side in the axial direction; a coil wire drawn out from the stator; an annular guide member arranged in the stepped portion, the guide member having a notch extending from the radially outer side to the radially inner side; and a control board having a through hole through which the end of the coil wire passes, wherein at least one side in the circumferential direction of the notch has an elastically deformable portion that is movable in the circumferential direction, and the end of the coil wire drawn out from the stator extends along the axial direction through the notch to the through hole. [Effects of the Invention]

[0007] According to one aspect of the present invention, a rotating electric machine that contributes to cost reduction can be provided. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view showing the rotating electric machine of this embodiment. [Figure 2] Figure 2 is a perspective view showing the rotating electric machine of this embodiment, excluding the cover and control board. [Figure 3] Figure 3 is a perspective view showing the cylindrical case of this embodiment. [Figure 4] Figure 4 is a perspective view of the guide member of this embodiment, seen from above. [Figure 5] Figure 5 is a partially enlarged view of the notch and elastically deformed portion in Figure 2, seen from above. [Figure 6] Figure 6 is a magnified view of a portion where the coil wire extending in the axial direction is located radially outward from the notch. [Figure 7] Figure 7 is a magnified view of a section where the coil wire extending in the axial direction is located in the second section 63b. [Figure 8] Figure 8 is a partial cross-sectional view showing the rotating electric machine of this embodiment. [Modes for carrying out the invention]

[0009] Each figure shows a hypothetical central axis J in the rotating electric machine of the embodiment described below. In the following explanation, the axial direction of the central axis J is 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 axial direction in which the Z-axis arrow points (+Z side) is referred to as the "upper side," and the side of the axial direction opposite to the side in which the Z-axis arrow points (-Z side) is referred to as the "lower side."

[0010] 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 merely names used to describe the relative positional relationship of each part, and the actual arrangement may be different from the arrangement indicated by these names. Also, in Figure 1, for illustrative purposes, cross-sections at different circumferential positions are shown on both the left and right sides of the central axis J.

[0011] As shown in Figures 1 and 2, the rotating electric machine 100 comprises a motor unit 1, a cylindrical case 10, a lid 20, a motor housing 30, and a guide member 60. The motor unit 1 comprises a rotating shaft 40, a rotor 50, a stator 70, and a control board 80.

[0012] The rotating shaft 40 is cylindrical in shape, extending axially around a central axis J. The rotating shaft 40 is supported by bearings 5a and 5b so as to be rotatable around the central axis J. 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 magnets 52. The rotor core 51 is annular in shape, surrounding the central axis J. The rotating shaft 40 passes axially through the radially inner side of the rotor core 51. The magnets 52 are fixed to the rotor core 51. Although not shown in the illustration, multiple magnets 52 are provided, for example, spaced apart in the circumferential direction.

[0013] The stator 70 is located radially outward from the rotor 50. The stator 70 is arranged around the rotor 50. The stator 70 is annular in shape, enclosing the rotor 50. The stator 70 includes a stator core 71, an insulator 72 attached to the stator core 71, and a plurality of coils 73 attached to the stator core 71 via the insulator 72.

[0014] The stator core 71 surrounds the rotor core 51. The stator core 71 has an annular core back 71a surrounding the rotor core 51, and a plurality of teeth extending radially inward from the core back 71a (not shown in the figure). The plurality of teeth are arranged in a line along the circumferential direction. The portion of the core back 71a, excluding the upper end, is press-fitted into and fixed to the motor housing 30. In this way, the stator 70 is fixed to the motor housing 30. The radially inward ends of the plurality of teeth face the outer circumferential surface of the rotor 50 with a small gap between them. In other words, in this embodiment, the stator 70 is positioned in a non-contact state with the outer circumferential surface of the rotor 50. The insulator 72 and coil 73 protrude from the stator core 71 on both axial sides.

[0015] The control board 80 is disposed above the rotor 50 and the stator 70. The control board 80 is positioned in the cylindrical case 10 by fitting into the fitting projection 14c (details will be described later). As shown in FIG. 1, one end of a plurality of terminals 83 is 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. When an external power source (not shown) is connected to the connector portion 19, the power of the external power source is supplied from the terminal 83 to the control board 80. The control board 80 has a plurality of through-holes 81 penetrating in the axial direction. The end of the coil wire 73a drawn 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 when the coil wire 73a is passed through the through-hole 81. The power supplied from an external power source (not shown) to the control board 80 is supplied to the coil 73 via the coil wire 73a.

[0016] The cylindrical case 10 is positioned below the lid body 20. The cylindrical case 10 is cylindrical with an open upper side. In the present embodiment, the cylindrical case 10 is made of resin. As shown in FIG. 3, the cylindrical case 10 has a bottom wall portion 11, an outer peripheral wall 12, an inner wall 14, a step portion 16, a groove portion 17, and a connector portion 19. The bottom wall portion 11 is annular and surrounds the central axis J. The bottom wall portion 11 is positioned below the stator 70.

[0017] The outer peripheral wall 12 is cylindrical and extends 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 body 20 is joined. The upper surface of the outer peripheral wall 12 has a groove 12a. The groove 12a is provided over the entire circumference. Although not shown, a sealing material is provided in the groove 12a. The outer peripheral wall 12 has a protruding wall 13. The protruding wall 13 protrudes outward in the radial direction of the outer peripheral wall 12. A plurality (six in FIG. 3) of protruding walls 13 are arranged at intervals in the circumferential direction. The protruding wall 13 has a cavity 13a opening upward. The cavity 13a extends in the axial direction. By screwing the tapping screw 13b (see FIG. 2) from above into the cavity 13a through the lid body 20 in a state where the sealing material is provided in the groove 12a, the cylindrical case 10 and the lid body 20 can be fixed in a sealed state. The connector portion 19 is provided on the outer peripheral wall 12.

[0018] The inner wall 14 protrudes upward from the bottom wall portion 11. More specifically, the inner wall 14 protrudes upward from the radially outer peripheral edge portion of the bottom wall portion 11. The inner wall 14 is annular and surrounds the central axis J. As shown in FIG. 1, the inner wall 14 is located radially outside the stator 70. The inner wall 14 surrounds the stator 70 from the radially outside. The inner wall 14 is located radially inside 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.

[0019] Fitting protrusions 14c are provided at the position of the inner wall 14 in the radial direction. A plurality (six in FIG. 3) of the fitting protrusions 14c are arranged at intervals in the circumferential direction. The fitting protrusions 14c protrude upward. The fitting protrusions 14c are connected to the outer peripheral wall 12 and the inner wall 14 by ribs 14d extending in the radial direction. The ribs 14d protrude upward from the bottom wall portion 11. Although not shown, the fitting protrusions 14c position the control board 80 by fitting into the through holes of the control board 80.

[0020] A plurality of step portions 16 are provided along the circumferential direction on the inner wall 14. Three step 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 step portions 16 face upward. Groove portions 17 are provided in the step portions 16. A plurality of sets (three sets in FIG. 3) of the groove portions 17 are arranged in the circumferential direction with two adjacent ones in the circumferential direction as a set. The groove portions 17 each extend from the radially inner side to the radially outer side. A part of the coil wire 73a drawn out from the stator 70 is accommodated in the groove portions 17. Since the groove portions 17 are inclined with a deeper radially inner side and a shallower radially outer side, when the coil wire 73a drawn out from the stator 70 is accommodated in the groove portions 17, the coil wire 73a inclines in a downward direction as it goes toward the radially outer side. As a result, it is possible to suppress the end portion side of the coil wire 73a from protruding above the step portion 16 from the groove portions 17 and to suppress hindering the operation of arranging the guide member 60 on the step portion 16.

[0021] As shown in Figure 1, the lid 20 is positioned on the upper side of the cylindrical case 10. The lid 20 is disc-shaped. The lid 20 closes the opening of the cylindrical case 10 via the sealing material described above. In this embodiment, the lid 20 is made of metal. The material constituting the lid 20 is, for example, iron. The lid 20 is made, for example, by press-forming a sheet metal member. In other words, in this embodiment, the lid 20 is a press-formed product.

[0022] As shown in Figure 4, the guide member 60 has a disc portion 61, a snap fit 62, a notch 63, and an elastically deformable portion 64. The disc portion 61 is annular in shape with a central axis J. The disc portion 61 is positioned above the stepped portion 16. The outer circumferential surface 61a of the disc portion 61 is located radially outward from the inner wall 14 and the groove portion 17. As shown in Figure 5, the disc portion 61 has a hole 65.

[0023] The snap-fit ​​62 extends downward from the disc portion 61. Multiple snap-fits 62 are arranged at intervals in the circumferential direction (six in Figure 4). Although not shown in the illustration, the snap-fit ​​62 hooks onto the radially outer side of the insulator 72. By each of the multiple snap-fits 62 hooking onto the radially outer side of the insulator 72, the guide member 60 is fixed in position on the cylindrical case 10 via the stator 70.

[0024] The notches 63 extend from the radially outer side to the radially inner side. Multiple pairs of notches 63 are arranged circumferentially, with two adjacent notches 63 forming one pair (three pairs in Figure 4). As shown in Figure 5, the disc portion 61 has holes 65. The holes 65 penetrate the disc portion 61 axially. The holes 65 include holes 65a and holes 65b. Hole 65a extends circumferentially and is located radially inward of a pair of notches 63. One circumferential end of hole 65a is located one circumferential side further than the furthest circumferential end of a pair of notches 63. The other circumferential end of hole 65a is located the other circumferential side further than the furthest circumferential end of a pair of notches 63. A pair of notches 63 overlaps with hole 65a in the radial direction. The hole 65b extends radially outward from the hole 65a. The hole 65b is located at the circumferential center of the hole 65a. The radially outward end of the hole 65b is located radially outward from the outer circumferential surface 61a of the disc portion 61.

[0025] The elastically deformable portion 64 includes a pair of straight sections 64a and a curved section 64b. Viewed axially, the pair of straight sections 64a are provided on one side of the circumferentially adjacent notch 63. The pair of straight sections 64a extend linearly in the radial direction. The pair of straight sections 64a are parallel to each other and face each other with a gap in the circumferential direction. The curved section 64b curves and connects the radially outer sides of the straight sections 64a. The curved section 64b is semicircular in shape. Viewed axially, the elastically deformable portion 64 is a U-shaped rib. The elastically deformable portion 64 is movable in the circumferential direction as the straight sections 64a elastically deform in the circumferential direction. The grooves 17 described above are arranged on both sides of the circumferential direction of the U-shaped rib when viewed axially. Since the grooves 17 are arranged on both sides of the U-shaped rib in the circumferential direction, the coil wire 73a drawn from the stator 70 can be accommodated in the grooves 17 at the bottom and pass through the notches 63 at the top.

[0026] On the other side of the notch 63, adjacent in the circumferential direction, is provided the outer edge portion 61b of the disc portion 61. The outer edge portion 61b extends linearly radially inward from the end of the outer peripheral surface 61a of the disc portion 61. The notch 63 is positioned between the circumferentially opposing straight portion 64a and the outer edge portion 61b.

[0027] The notch 63 has a first portion 63a and a second portion 63b. The first portion 63a is located radially inward in the notch 63. The circumferential width of the first portion 63a is wider than the diameter of the coil wire 73a. The first portion 63a faces the through-hole 81 in the axial direction. The second portion 63b is located radially outward from the first portion 63a. The circumferential width of the second portion 63b is narrower than the diameter of the coil wire 73a. Therefore, as shown in Figure 6, when the axially extending coil wire 73a located radially outward in the notch 63 is moved radially inward and positioned in the second portion 63b as shown in Figure 7, the straight portion 64a elastically deforms toward the hole 65b side, as indicated by the arrow in Figure 7, thereby widening the circumferential width of the notch 63.

[0028] As a result, the coil wire 73a becomes movable radially inward, reaching the first portion 63a and being held by its outer surface. When the coil wire 73a reaches the first portion 63a, the second portion 63b, whose circumferential width had widened due to the elastic deformation of the straight portion 64a, becomes narrower in circumferential direction than the diameter of the coil wire 73a as the elastic deformation of the straight portion 64a is released. Consequently, the coil wire 73a held in the first portion 63a becomes unable to move radially outward and is fixed to the first portion 63a. That is, the coil wire 73a is held in a position facing the through-hole 81 in the axial direction.

[0029] In the rotating electric machine 100 with the above configuration, before the cover 20 and guide member 60 are placed, the motor unit 1 and motor housing 30 (excluding the control board 80) are fixed to the cylindrical case 10, and as shown in Figure 8, a portion of the coil wire 73a drawn from the stator 70 is housed in the groove 17, and the end of the coil wire 73a drawn from the groove 17 is curved upward at a position radially outward from the outer circumferential surface 61a of the disc portion 61 and aligned axially. At this time, since the coil wire 73a is guided by the groove 17, a portion of it is positioned to face the notch 63 in the axial direction.

[0030] Next, the guide member 60 is positioned above the stepped portion 16. As a result, as shown in Figure 6, the coil wire 73a is positioned radially outward of the notch 63. From this state, the coil wire 73a is moved radially inward and fixed to the first portion 63a via the second portion 63b, as shown in Figure 7, and as shown in Figure 5. At this time, the end of the coil wire 73a extends upward at a position axially opposite the through-hole 81 of the control board 80. Then, when the control board 80 is placed on the cylindrical case 10 as shown in Figure 1, the lower end of the coil wire 73a is housed in the groove 17, and the upper end extends through the notch 63 to the through-hole 81 and is inserted.

[0031] As described above, in the rotating electric machine 100 of this embodiment, a guide member 60 having a notch 63 is arranged in the cylindrical case 10, and the end of the coil wire 73a drawn out from the stator 70 extends axially through the notch 63 to the through hole 81, so that the coil wire 73a can be easily positioned at the connection position of the control board 80. Therefore, in the rotating electric machine 100 of this embodiment, the coil wire 73a can be easily connected to the control board 80 with a minimum number of components, contributing to cost reduction and improved workability.

[0032] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these examples. The shapes and combinations of the constituent members shown in the above examples are merely examples, and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

[0033] The applications of the rotating electric machine to which the present invention applies are not particularly limited. The rotating electric machine may be mounted on any equipment. The rotating electric machine may be mounted on an actuator equipped with a reduction mechanism. The rotating electric machine may also be a generator. The applications of the pump to which the present invention applies are not particularly limited. The pump may be mounted on any equipment. The pump may, for example, be mounted on a vehicle. The pump may be a pump that delivers any fluid. The pump may be an oil pump that delivers oil. In addition, the configurations described herein can be combined as appropriate, within the bounds of what is not mutually contradictory. [Explanation of Symbols]

[0034] 1…Motor unit, 10…Cylindrical case, 14…Inner wall, 16…Stepped section, 17…Groove section, 40…Rotating shaft, 50…Rotor, 60…Guide member, 63…Notch, 63a…First section, 63b…Second section, 64…Elastically deformable section, 64a…Straight section, 64b…Curved section, 70…Stator, 73a…Coil wire, 80…Control board, 81…Through-hole, 100…Rotating electric machine, J…Central axis

Claims

1. 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 arranged around the rotor, A cylindrical case having an opening on one side in the axial direction and housing the motor unit, A groove arrangement portion is provided on the inner wall of the cylindrical case along the circumferential direction, with grooves facing one side in the axial direction and recessed on the other side in the axial direction, The coil wire drawn from the stator, The annular guide member, having two notches extending from the radially outer to the radially inner direction, which are located close together in the circumferential direction and formed on one axial side of the groove arrangement portion, A control board having a through-hole through which the end of the coil wire passes, It has, The guide member has an elastically deformable portion that is movable in the circumferential direction between the two notches, The groove extends from the radially inner side to the radially outer side, A rotating electric machine in which the coil wire drawn out from the stator has its other axial end housed in the groove and its other axial end extending through the notch to the through-hole.

2. The groove portion is inclined such that the inner side in the radial direction is deeper and the outer side in the radial direction is shallower. The rotating electric machine according to claim 1.

3. The aforementioned notches are arranged in multiple sets in the circumferential direction, with two adjacent notches forming one pair. The rotating electric machine according to claim 1 or 2.

4. The elastically deformable portion in a pair of notches is a U-shaped rib portion that, when viewed in the axial direction, includes a pair of straight portions that are spaced apart in the circumferential direction and face each other, extending radially, and a curved portion that curves to connect the radially outer sides of the straight portions. The rotating electric machine according to claim 3.

5. The two grooves are located on both sides of the circumferential direction of the U-shaped rib when viewed in the axial direction. The rotating electric machine according to claim 4.

6. The aforementioned notch is A first portion located radially inward and having a circumferential width wider than the diameter of the coil wire, A second portion located radially outward from the first portion and having a circumferential width narrower than the diameter of the coil wire, It has, The first part is facing the through-hole in the axial direction, A rotating electric machine according to any one of claims 1 to 5.

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