JP2019170137A - Bus bar unit, motor, and assembly method of bus bar unit - Google Patents

Abstract

To provide a bus bar unit capable of simplifying assembly of a bus bar and reducing costs.SOLUTION: A bus bar unit 50 is used for a motor 100 having a stator 30. The bus bar unit 50 includes: one or more bus bars 52U, 53V, 54W; a bus bar holder 60; and a retaining member 70. The bus bars 52U, 53V, 54W are electrically connected to the stator 30. The bus bar holder 60 is disposed on an upper side of the stator 30 in an axial direction and has an insertion groove 64 into which the bus bars 52U, 53V, 54W are inserted from a lower side in the axial direction. The retaining member 70 is attached to the bus bar holder 60 and prevents the bus bars 52U, 53V, 54W from coming off.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a bus bar unit, a motor, and a method for assembling the bus bar unit.

  Conventionally, there is a motor including a bus bar unit. The bus bar unit has a bus bar holder that holds a plurality of bus bars. For example, in Patent Document 1, a plurality of bus bars are assembled from above the bus bar holder. Moreover, as shown in Patent Document 2, there is a bus bar including a terminal connected to an external device.

Japanese Patent No. 5657308 Japanese Patent No. 6053001

  An object of the present invention is to simplify assembly of a bus bar and reduce costs in a bus bar unit.

  A bus bar unit according to an exemplary embodiment of the present invention is used in a motor having a stator. The bus bar unit includes one or more bus bars, a bus bar holder, and a retaining member. One or more bus bars are electrically connected to the stator. The bus bar holder is disposed on the upper side in the axial direction of the stator and has an insertion groove into which the bus bar is inserted from the lower side in the axial direction. The retaining member is attached to the bus bar holder and prevents the bus bar from coming off.

  According to an exemplary embodiment of the present invention, the bus bar inserted into the insertion groove from the lower side of the bus bar holder is prevented by the retaining member. Thereby, the assembly of the bus bar to the bus bar holder can be simplified. In addition, for example, when a guide part for guiding the terminal part of the bus bar is provided in the bus bar holder, the guide part can be integrally formed with the bus bar holder, so that the positional accuracy of the guide part is improved and the cost of the bus bar unit can be reduced.

FIG. 1 is a schematic cross-sectional view of the motor of this embodiment. FIG. 2 is a perspective view of the stator as viewed from above. FIG. 3 is a perspective view of the bus bar unit as viewed from above. FIG. 4 is a perspective view of the bus bar unit as viewed from below. FIG. 5 is a perspective view of the phase bus bar as seen from above. FIG. 6 is a bottom view of the bus bar holder. FIG. 7 is a view in which a bus bar for use is arranged on the bus bar holder. FIG. 8 is a perspective view of the bus bar unit as seen from below. FIG. 9 is a view showing an assembly process of the bus bar unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings used in the following description, for the purpose of emphasizing the feature portion, the feature portion may be shown in an enlarged manner for convenience, and the dimensional ratios of the respective constituent elements are not always the same as in practice. Absent. In addition, for the same purpose, there are cases in which portions that do not become features are omitted and illustrated.

  In the following description, the direction in which the central axis A of the rotor 20 extends is simply referred to as “axial direction”, the direction orthogonal to the central axis A is simply referred to as “radial direction”, and the direction around the axis of the central axis A is referred to as “axial direction”. It is simply called “circumferential direction”. 1 in the “axial direction” is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”. Note that the vertical direction does not indicate the positional relationship and direction when incorporated in an actual device.

  FIG. 1 is a schematic cross-sectional view of the motor 100. The motor 100 according to the present embodiment is a brushless motor having three phases of a U phase, a V phase, and a W phase. The motor 100 includes a housing 10, a rotor 20, a stator 30, and a bus bar unit 50 (see FIG. 3). In FIG. 1, the bus bar unit 50 is omitted.

<Housing 10>
The housing 10 accommodates the rotor 20, the stator 30, and the bus bar unit 50 in the internal space. The housing 10 has a bottomed cylindrical shape, and includes a cylindrical portion 11 and a bottom portion 12. The cylindrical portion 11 is cylindrical and extends in the axial direction along the central axis A. The bottom 12 is disposed at the lower end of the cylindrical portion 11 and extends radially inward from the lower end of the cylindrical portion 11. The bottom part 12 has a shaft through hole 12a and a bearing holding part 12b. The shaft through hole 12 a is provided at the center of the bottom portion 12.

<Rotor 20>
The rotor 20 includes a shaft 21, a rotor core 22, and a magnet 23. The shaft 21 extends in the axial direction, is supported by a pair of bearings 40 disposed in the housing 10, and is rotatable about the central axis A.

  The rotor core 22 is a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the axial direction. The rotor core 22 is fixed to the shaft 21 that passes through the center of the rotor core 22 and rotates together with the shaft 21.

  The magnet 23 is fixed to the outer surface of the rotor core 22 and rotates together with the rotor core 22 and the shaft 21. The rotor 20 in the present embodiment is a rotor used for an SPM (Surface Permanent Magnet) motor. Note that the rotor 20 may be a rotor used in an IPM (Interior Permanent Magnet) motor in which a magnet 23 is embedded in a rotor core 22.

<Stator 30>
FIG. 2 is a perspective view of the stator 30 as viewed from above. The stator 30 surrounds the outer side of the rotor 20 in the radial direction. The stator 30 includes a plurality of divided stator cores 31, a plurality of insulators 32, and a plurality of coils 33.

  The stator core 31 is a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the axial direction. The stator cores 31 are arranged side by side in the circumferential direction, and each have a core back 31a and teeth 31b (see FIG. 1). The core back 31a has a cylindrical shape concentric with the central axis A. The teeth 31b extend radially inward from the inner surface of the core back 31a. In the present embodiment, twelve teeth 31b are provided.

  The insulator 32 is attached to each tooth 31 b and covers at least a part of the stator core 31. Specifically, the insulator 32 covers at least the upper end surface and the lower end surface of each tooth 31b. The insulator 32 is made of an insulating material such as resin.

  The coil 33 is configured by winding a conductive wire around a tooth 31b via an insulator 32. The coil 33 in the present embodiment is composed of a plurality of coil groups in which two coils 33 are connected by one conductive wire, and each of the coil groups corresponds to one of the U phase, V phase, and W phase. To do. The motor 100 is provided with a neutral point bus bar (not shown) that configures an electrical neutral point by connecting coil groups corresponding to the U phase, the V phase, and the W phase. Two coil wires 33a (see FIG. 1) are drawn from the coil group. In FIG. 2, the coil wire 33a is not shown.

<Bus bar unit 50>
FIG. 3 is a perspective view of the bus bar unit 50 as viewed from above. FIG. 4 is a perspective view of the bus bar unit 50 as viewed from below. The bus bar unit 50 includes a plurality of power supply systems, with a set of U phase, V phase, and W phase as one system. In the present embodiment, the bus bar unit 50 has two power supply systems. The bus bar unit 50 includes one or more bus bars 52U, 53V, 54W, a bus bar holder 60, and a retaining member 70.

[Bus bar 52U, 53V, 54W]
FIG. 5 is a perspective view of one system of bus bars 52U, 53V, 54W inserted into the bus bar holder 60 as viewed from above. The bus bars 52U, 53V, and 54W are formed of conductive plate-like members and have different shapes. The bus bars 52U, 53V, and 54W are phase bus bars corresponding to any of the U phase, V phase, and W phase. Here, there are two phase bus bars corresponding to the U phase, V phase, and W phase. It is provided one by one. In the present embodiment, for example, the bus bar 52U corresponds to the U phase, the bus bar 53V corresponds to the V phase, and the bus bar 54W corresponds to the W phase. The bus bars of the same phase are arranged at positions facing each other.

[Bus bar 52U]
The bus bar 52U includes a bus bar main body 52a, a first extending portion 52b, a second extending portion 52c, a connecting portion 52d, and a terminal portion 52e.

  The bus bar body 52a is plate-shaped, and the thickness direction coincides with the axial direction. The bus bar main body 52a extends in the circumferential direction.

  The first extending portion 52b extends radially outward from one end of the bus bar main body portion 52a, and connects the bus bar main body portion 52a and the connection portion 52d. The second extending portion 52c extends radially outward from the other end of the bus bar main body portion 52a and connects the bus bar main body portion 52a and the terminal portion 52e.

  The connecting portion 52d is a portion that is electrically connected to the coil wire 33a by laser welding or the like. The connecting portion 52d extends axially upward from the radially outer end of the first extending portion 52b. The connection part 52d has a substantially U-shaped coil wire holding part 52f at the upper end in plan view.

  The terminal portion 52e is a portion that is electrically connected to an external device (not shown). The terminal part 52e extends axially upward from the radially outer end of the second extending part 52c.

[Bus bar 53V]
The bus bar 53V includes a bus bar main body portion 53a, a first extending portion 53b, a second extending portion 53c, a connecting portion 53d, and a terminal portion 53e.

  The bus bar main body 53a is plate-shaped, and the thickness direction coincides with the axial direction. The bus bar main body 53a extends longer in the circumferential direction than the bus bar main body 52a.

  The first extending portion 53b extends radially outward from one end of the bus bar main body portion 53a, and connects the bus bar main body portion 53a and the connection portion 53d. The second extending portion 53c extends radially outward from the other end of the bus bar main body portion 53a, and connects the bus bar main body portion 53a and the terminal portion 53e.

  The connection portion 53d is a portion that is electrically connected to the coil wire 33a by laser welding or the like. The connecting portion 53d extends axially upward from the radially outer end of the second extending portion 53c. The connection part 53d has a substantially U-shaped coil wire holding part 53f at the upper end part in plan view.

  The terminal portion 53e is a portion that is electrically connected to an external device (not shown) and extends axially upward from the radially outer end of the first extending portion 53b.

[Bus bar 54W]
The bus bar 54W includes a bus bar body 54a, a first extending portion 54b, a second extending portion 54c, a connecting portion 54d, and a terminal portion 54e. The connection part 54d has a coil wire holding part 54f. The bus bar main body portion 54a is shorter in the circumferential direction than the bus bar main body portion 53a and extends longer in the circumferential direction than the bus bar main body portion 52a. Other configurations are substantially the same as those of the bus bar 52U, and thus the description thereof is omitted.

[Bus bar holder 60]
The bus bar holder 60 is formed of an insulating material such as resin. The bus bar holder 60 has an annular shape and is disposed on one axial side of the stator 30. In the present embodiment, the bus bar holder 60 is disposed on the upper side in the axial direction of the stator 30. As shown in FIGS. 4 and 5, bus bars 52 </ b> U, 53 </ b> V, and 54 </ b> W are disposed on the bus bar holder 60 so as to overlap in the axial direction via spacers 41 disposed on the bus bar holder 60. The spacer 41 has a plate shape, and the thickness direction coincides with the axial direction. The spacer 41 is formed of an insulating material such as resin.

  FIG. 6 is a bottom view of the bus bar holder 60. As shown in FIGS. 4, 6, and 7, the bus bar holder 60 includes a foot 61, a notch 62, a guide groove 63 (see FIG. 3), an insertion groove 64, a through-hole 65, a guide. It has a part 66, an insertion part 67, a lateral groove part 68, and a support part 69. FIG. 7 is a diagram in which bus bars 52U, 53V, and 54W are arranged on the bus bar holder 60. FIG.

  The foot 61 extends in a plate shape on the lower side in the axial direction toward the stator 30 on the radially outer side. For example, six feet 61 are provided at intervals in the circumferential direction. The lower end portion of the foot portion 61 contacts the upper portion of the core back 31a of the stator core 31 so that the bus bar holder 60 is directly supported by the stator 30 in the axial direction. Further, the foot portion 61 is disposed in a positioning portion 32a provided in the insulator 32 (see FIG. 2). The positioning portion 32a is a groove that opens radially outward, and the bus bar holder 60 is positioned in the circumferential direction by the positioning portion 32a. Here, since the bus bar holder 60 is directly supported by the stator 30, the accuracy of the position of the bus bar holder 60 is improved.

  A plurality of notches 62 are recessed radially inward from the outer periphery of the bus bar holder 60, and a plurality of notches 62 are provided at intervals in the circumferential direction. As shown in FIG. 3, the connection portions 52 d, 53 d, 54 d of the bus bars 52 U, 53 V, 54 W are arranged one by one in the notch 62.

  As shown in FIG. 3, the guide groove 63 is provided on the outer peripheral portion of the bus bar holder 60. Specifically, the guide groove 63 is a groove extending in the circumferential direction from the notch 62, and guides the coil wire 33a in the circumferential direction. By guiding the coil wire 33a in the circumferential direction by the guide groove 63, the coil wire 33a can be easily connected to the connection portions 52d, 53d, and 54d.

  As shown in FIGS. 6 and 7, the insertion groove 64 is a recess that opens on the lower side in the axial direction. A plurality of bus bars 52U, 53V, and 54W are inserted into the insertion groove 64 from the lower side in the axial direction. The insertion groove 64 has a first groove part 64a, a second groove part 64b, and a third groove part 64c.

  The first groove portion 64a is formed in an annular shape or an arc shape. In the present embodiment, the first groove portion 64a is formed in an annular shape. The bus bar main body parts 52a, 53a, 54a of the bus bars 52U, 53V, 54W are inserted into the first groove part 64a. Preferably, the groove width of the first groove part 64a, that is, the dimension in the radial direction of the first groove part 64a is approximately the same as the width dimension of the bus bar main body parts 52a, 53a, 54a. The same degree includes a case where the width is slightly larger than or slightly smaller than the width of the bus bar main body portions 52a, 53a, 54a. The first groove portion 64a prohibits the radial movement of the bus bar main body portions 52a, 53a, 54a.

  The second groove part 64b extends radially outward from the first groove part 64a and connects the first groove part 64a and the notch part 62. In the present embodiment, a plurality of second groove portions 64b are provided at intervals in the circumferential direction. The first extending portions 52b, 53b, 54b of the bus bars 52U, 53V, 54W are inserted into the second groove portion 64b one by one. Second groove portion 64b prohibits movement of bus bars 52U, 53V, 54W in the circumferential direction.

  The third groove portion 64c is provided at a position different from the second groove portion 64b. The third groove portion 64 c extends radially outward from the first groove portion 64 a and connects the first groove portion 64 a and the through hole 65. In the present embodiment, a plurality of third groove portions 64c are provided at intervals in the circumferential direction. The second extending portions 52c, 53c, 54c of the bus bars 52U, 53V, 54W are inserted one by one into the third groove portion 64c. The third groove portion 64c prohibits the circumferential movement of the bus bars 52U, 53V, 54W.

  The through hole 65 is a circular hole, and extends axially upward from the radially outer end of the third groove 64c. Terminal portions 52e, 53e, 54e of bus bars 52U, 53V, 54W penetrate through hole 65 in the axial direction.

  As shown in FIGS. 3 and 6, the guide portion 66 is provided in the upper portion of the bus bar holder 60 and extends in a cylindrical shape from the through hole 65 to the upper side in the axial direction. The guide part 66 guides the terminal parts 52e, 53e, 54e of the bus bars 52U, 53V, 54W. The guide portion 66 has an inner peripheral portion that is continuous with the through hole 65. The terminal portions 52e, 53e, and 54e of the bus bars 52U, 53V, and 54W penetrate in the axial direction through the inner peripheral portion of the guide portion 66, and the terminal portions 52e, 53e, and 54e are guided by the guide portion 66. In this embodiment, since the guide part 66 is integrally formed with the bus bar holder 60, the accuracy of the position of the guide part 66 is improved. Thereby, the precision of the position of the terminal parts 52e, 53e, and 54e guided by the guide part 66 improves. Furthermore, since the bus bar holder 60 and the guide portion 66 are formed of a single member, the cost of the bus bar unit 50 can be reduced.

  The insertion portion 67 is a groove opened on the lower side in the axial direction, and extends radially outward from the first groove portion 64a at a position different from the second groove portion 64b and the third groove portion 64c. In the present embodiment, two insertion portions 67 are provided at an interval of 180 degrees in the circumferential direction. A protrusion 70b (described later) of the retaining member 70 is inserted into the insertion portion 67 from the lower side in the axial direction.

  As shown in FIG. 7, the lateral groove portion 68 is provided so that the protruding portion 70 b of the retaining member 70 inserted into the insertion portion 67 can be inserted in the circumferential direction. The lateral groove portion 68 extends in the circumferential direction from the insertion portion 67 and is provided continuously to the insertion portion 67.

  The support portion 69 supports the protruding portion 70 b of the retaining member 70. In the present embodiment, the support portion 69 is constituted by the bottom portion of the lateral groove portion 68 on the lower side in the axial direction. That is, the lateral groove 68 is provided on the upper side of the support 69 in the axial direction.

  FIG. 8 is a bottom view of the retaining member 70. The retaining member 70 is a member for retaining the bus bars 52U, 53V, 54W, and is attached to the bus bar holder 60. The retaining member 70 is an example of an insertion member.

  The retaining member 70 is inserted into the bus bar holder 60 from the lower side in the axial direction. The retaining member 70 has a plate shape, and the thickness direction coincides with the axial direction. The retaining member 70 is made of an insulating material such as metal or resin, for example. The retaining member 70 includes an annular portion 70a and one or more protruding portions 70b.

  The annular portion 70a is disposed in the first groove portion 64a. The dimension in the radial direction of the annular portion 70a is preferably approximately the same as the dimension in the radial direction of the first groove portion 64a.

  The protruding portion 70b protrudes radially outward from the annular portion 70a. In the present embodiment, two protrusions 70b are provided at an interval of 180 degrees in the circumferential direction. The protruding portion 70b is inserted into the insertion portion 67 of the bus bar holder 60 from the lower side in the axial direction. As shown in FIG. 4, the protruding portion 70 b can be inserted into the horizontal groove portion 68 via the insertion portion 67, and the protruding portion 70 b is supported by the horizontal groove portion 68. Specifically, after inserting the protruding portion 70 b into the insertion portion 67, the retaining member 70 is rotated in the circumferential direction and the protruding portion 70 b is inserted into the lateral groove portion 68. Accordingly, the retaining member 70 is supported by the bus bar holder 60, and the bus bars 52 </ b> U, 53 </ b> V, 54 </ b> W are retained from the bus bar holder 60 by the retaining member 70.

  In the bus bar unit 50 configured as described above, the bus bars 52U, 53V, 54W inserted into the bus bar holder 60 from the lower side in the axial direction are prevented from being detached from the bus bar holder 60 by the retaining member 70. By supporting the protruding portion 70 b of the retaining member 70 with the support portion 69, the retaining member 70 is supported by the bus bar holder 60 with a simple configuration. Thereby, the assembly of the bus bar unit 50 can be simplified.

[Assembly method of bus bar unit 50]
Next, an example of a method for assembling the bus bar unit 50 will be described with reference to FIG.

  In step S1, the bus bars 52U, 53V, 54W, the bus bar holder 60, the retaining member 70, and the spacer 41 are prepared. The bus bars 52U, 53V, 54W are formed, for example, by punching a metal plate by press working and bending it in the thickness direction with a press machine. Each of the bus bar holder 60, the retaining member 70, and the spacer 41 is molded by filling a mold with an insulating resin by, for example, injection molding.

  In step S <b> 2, the bus bars 52 </ b> U, 53 </ b> V, 54 </ b> W are inserted into the insertion grooves 64 of the bus bar holder 60 from the lower side in the axial direction. For example, when the bus bar 53V is inserted into the insertion groove 64, the bus bar main body portion 53a is disposed in the first groove portion 64a, the first extending portion 53b is disposed in the second groove portion 64b, and the second extending portion 53c is disposed in the third groove portion 65b. To place. The terminal portion 53e is inserted into the guide portion 66 through the through hole 65, and penetrates the through hole 65 and the inner peripheral portion of the guide portion 66 in the axial direction. When the bus bar 53V is inserted into the insertion groove 64, it is preferable to insert the bus bar 53V into the insertion groove 64 with the bus bar holder 60 inverted. When the bus bars 52U, 53V, 54W are arranged so as to overlap each other in the axial direction, the spacer 41 is inserted from the insertion groove 64 to prevent a short circuit due to contact between the bus bars 52U, 53V, 54W.

  In step S <b> 3, the protruding portion 70 b of the retaining member 70 is inserted into the insertion portion 67 at a position where the annular portion 70 a of the retaining member 70 and the first groove portion 64 a of the insertion groove 64 overlap in the axial direction.

  In step S <b> 4, the protruding portion 70 b is rotated in the circumferential direction toward the lateral groove portion 68, and the protruding portion 70 b is disposed on the upper side in the axial direction of the support portion 69. Specifically, for example, the annular portion 70 a is rotated in the circumferential direction, and the protruding portion 70 b is disposed on the upper side in the axial direction of the support portion 69. As a result, the retaining member 70 is supported by the bus bar holder 60, and the bus bars 52 U, 53 V, 54 W are retained from the bus bar holder 60 by the retaining member 70.

<Other embodiments>
The present invention is not limited to the embodiment as described above, and each configuration and combination thereof in the embodiment is an example, and additions, omissions, and substitutions of configurations are within the scope not departing from the gist of the present invention. And other changes are possible.

  In the embodiment, the protrusion 70 b is supported by the support 69 and the retaining member 70 is attached to the bus bar holder 60. However, the retaining member 70 may be fixed to the bus bar holder 60 by snap fitting. For example, one of the insertion groove 64 and the retaining member 70 is provided with a recess, the other of the insertion groove 64 and the retaining member 70 is provided with a protrusion, and the protrusion is fitted into the recess so that the stopper member 70 is attached to the bus bar holder 60. It may be fixed to. Further, a groove in which the snap ring can be attached and detached is provided on the inner peripheral portion of the insertion groove 64, and the bus bars 52U, 53V, 54W may be prevented from being detached from the bus bar holder 60 by the snap ring attached to the groove.

  In the embodiment, the first groove portion 64a of the insertion groove 64 is formed in an annular shape, but the first groove portion 64a may be arcuate. Similarly, the annular portion 70a of the retaining member 70 may be arcuate.

  In the above-described embodiment, the phase bus bars 52U, 53V, and 54W are inserted into the bus bar holder 60. However, the neutral point bus bar is inserted into the bus bar holder 60, and the neutral point bus bar is secured by the retaining member 70. You may comprise so that it may not come off.

  The shape of the bus bar holder 60 and the shapes of the bus bars 52U, 53V, 54W are not limited to the above embodiment. The bus bar holder 60 may have an insertion groove 64 into which at least the bus bars 52U, 53V, 54W are inserted from the lower side in the axial direction. Also, the shape of the insertion groove 64 can be appropriately changed depending on the shape of the bus bars 52U, 53V, 54W.

  In the embodiment, the insertion portion 67 is provided in the bus bar holder 60, but the second groove portion 64 b or the third groove portion 64 c may also serve as the configuration of the insertion portion 67. In this case, the lateral groove portion 68 extends in the circumferential direction from the second groove portion 64b or the third groove portion 64c, and is provided continuously to the second groove portion 64b or the third groove portion 64c.

20 Rotor 21 Shaft 30 Stator 41 Spacer 50 Bus bar unit 52U Bus bar 52d Connection part 52e Terminal part 53V Bus bar 53d Connection part 53e Terminal part 54W Bus bar 54d Connection part 54e Terminal part 60 Bus bar holder 61 Foot part 62 Notch part 63 Guide groove 64 Insertion Groove 64a First groove portion 64b Second groove portion 65 Through hole 66 Guide portion 67 Insertion portion 68 Horizontal groove portion 69 Support portion 70 Retaining member (an example of an insertion member)
70a Annular part 70b Protruding part 100 Motor

Claims (20)

A bus bar unit used for a motor having a stator,
One or more bus bars electrically connected to the stator;
A bus bar holder that is disposed on the upper side in the axial direction of the stator and has an insertion groove into which the bus bar is inserted from the lower side in the axial direction;
A retaining member attached to the bus bar holder and retaining the bus bar;
A bus bar unit. The bus bar includes a bus bar having a terminal portion connected to an external device,
The bus bar holder includes a through hole through which the terminal portion penetrates in the axial direction, and a guide portion that extends axially upward from the through hole and guides the terminal portion.
The bus bar unit according to claim 1. The groove width of the insertion groove of the bus bar holder is approximately the same as the width dimension of the bus bar.
The bus bar unit according to claim 1 or 2. The insertion groove of the bus bar holder has an annular or arc-shaped first groove portion,
The retaining member has an annular portion or an arc-shaped portion disposed in the first groove portion.
The bus bar unit according to any one of claims 1 to 3. The bus bar holder further includes a notch provided in the outer peripheral portion,
The insertion groove of the bus bar holder further includes a second groove part extending in a radial direction and connecting the first groove part and the notch part,
The bus bar further includes a connection portion disposed in the notch portion and connected to a coil of the stator.
The bus bar unit according to claim 4. The bus bar holder has a guide groove on the outer peripheral portion that extends in the circumferential direction from the cutout portion and guides the coil wire of the coil in the circumferential direction.
The bus bar unit according to claim 5. The retaining member is fixed to the bus bar holder by a snap fit.
The bus bar unit according to any one of claims 1 to 6. The retaining member further includes one or more projecting portions projecting in a radial direction from the annular portion or the arc-shaped portion,
The bus bar holder further includes an insertion portion into which the protrusion is inserted from the lower side in the axial direction, and a support portion that supports the protrusion.
The bus bar unit according to any one of claims 4 to 6. The bus bar holder further includes a lateral groove portion that is provided on the upper side in the axial direction of the support portion and into which a protruding portion inserted into the insertion portion can be inserted in the circumferential direction.
The bus bar unit according to claim 8. The bus bar unit according to claim 1, wherein the bus bar is a phase bus bar. A set of U phase, V phase, and W phase is provided as a single system, and a plurality of power supply systems are provided.
The bus-bar unit of any one of Claim 1 to 10. The bus bar is disposed so as to overlap in the axial direction via a spacer disposed on the bus bar holder.
The bus bar unit according to any one of claims 1 to 11. The bus bar holder further includes one or more feet supported by the stator.
The bus bar unit according to any one of claims 1 to 12. A rotor having a rotating shaft extending vertically;
A stator disposed radially outside the rotor;
A bus bar unit according to any one of claims 1 to 13,
Comprising a motor. A bus bar unit used for a motor having a stator,
One or more bus bars electrically connected to the stator;
A bus bar holder that is disposed on the upper side in the axial direction of the stator and has an insertion groove into which the bus bar is inserted from the lower side in the axial direction;
An insertion member inserted into the insertion groove and supported by the bus bar holder in the axial direction;
With
The insertion groove of the bus bar holder has an annular or arc-shaped first groove portion,
The insertion member has an annular part or an arcuate part disposed in the first groove part, and one or more projecting parts projecting radially from the annular part or the arcuate part,
The bus bar holder is a bus bar unit further including an insertion portion into which the protruding portion is inserted from the lower side in the axial direction, and a support portion that supports the protruding portion. The bus bar holder further includes a lateral groove portion which is provided on the upper side in the axial direction of the support portion and can be inserted in the circumferential direction into the protruding portion inserted into the protruding portion.
The bus bar unit according to claim 15. The bus bar includes a bus bar having a terminal portion connected to an external device,
The bus bar holder includes a through hole through which the terminal portion penetrates in the axial direction, and a guide portion that extends axially upward from the through hole and guides the terminal portion.
The bus bar unit according to claim 15 or 16. The insertion groove of the bus bar holder restricts the radial movement of the bus bar;
The bus bar unit according to any one of claims 15 to 17. The bus bar holder further includes a notch provided in the outer peripheral portion,
The insertion groove of the bus bar holder further includes a second groove part extending in a radial direction and connecting the first groove part and the notch part,
The bus bar further includes a connection portion disposed in the notch portion and connected to a coil of the stator.
The bus bar unit according to any one of claims 15 to 18. The bus bar unit assembly method according to claim 16, wherein the bus bar is inserted into the insertion groove of the bus bar holder from the lower side in the axial direction.
A second step of inserting the protruding portion into the insertion portion from the lower side in the axial direction at a position where the annular portion or the arc-shaped portion and the first groove portion overlap in the axial direction;
A third step of rotating the protrusion in the circumferential direction toward the lateral groove, and disposing the protrusion on the upper side in the axial direction of the support;
A method for assembling the bus bar unit.