JP7120251B2 - Busbar unit and motor - Google Patents

Description

The present invention relates to a busbar unit and a motor.

Patent Literature 1 discloses a conventionally known busbar unit. This busbar unit has a plurality of busbars. The bus bar also has a terminal (external connection terminal) that connects to an external device and a connection portion (coil wire connection portion) that connects to the coil wire drawn out from the stator.

WO2016/110424

External connection terminals are required to have reduced dimensional variation in order to stabilize electrical connection with the control device. However, since the conventional external connection terminal is provided at one end of the elongated bus bar, it is difficult to suppress dimensional variations.

An object of one aspect of the present invention is to provide a busbar unit that can suppress dimensional variations in the external connection terminals by separating the external connection terminals and the busbars.

A busbar unit according to one aspect of the present invention is a busbar unit provided in a motor, and includes a plurality of busbars positioned above a stator annularly arranged around a central axis extending in the vertical direction, and a plurality of busbars extending along the axial direction. and an external connection terminal. The bus bar is provided with an insertion hole penetrating in the axial direction. The external connection terminal is inserted into the insertion hole.

According to one aspect of the present invention, there is provided a busbar unit capable of suppressing dimensional variation of the external connection terminals by separating the external connection terminals and the busbars.

FIG. 1 is a schematic cross-sectional view of a motor according to one embodiment. FIG. 2 is an exploded view of the phase busbar unit (busbar unit) of one embodiment. FIG. 3 is a plan view of a phase busbar (busbar) and a busbar holder of one embodiment. FIG. 4 is a schematic diagram for explaining the positioning structure of the busbar holder with respect to the bearing holder in the motor of one embodiment. FIG. 5 is an enlarged view of area V in FIG. FIG. 6 is an enlarged view of area VI in FIG. FIG. 7 is a partial cross-sectional view of a busbar holder, a terminal receiving member, and a cover member in the phase busbar unit of one embodiment. FIG. 8 is a partial cross-sectional view of a busbar holder, a terminal receiving member, and a cover member that employ the fixing structure of Modification 1. FIG. FIG. 9 is a partial cross-sectional view of a busbar holder, a terminal receiving member, and a cover member that employ the fixing structure of Modification 2. FIG. FIG. 10 is a partial cross-sectional view of a terminal receiving member of Modification 3. FIG. FIG. 11 is a schematic diagram illustrating Modification 4 of the structure for positioning the busbar holder with respect to the bearing holder. FIG. 12 is a schematic diagram illustrating Modification 5 of the positioning structure of the busbar holder with respect to the bearing holder.

Hereinafter, a busbar unit and a motor according to embodiments of the present invention will be described with reference to the drawings. In the drawings below, the actual structure and the scale, number, etc. of each structure may be different in order to make each structure easier to understand.

Each figure shows the Z-axis as appropriate. The Z-axis direction in each drawing is parallel to the central axis J shown in FIG. Also, in the following description, the positive side in the Z-axis direction (+Z side) is called the "upper side", and the negative side in the Z-axis direction (-Z side) is called the "lower side". Note that the upper side and the lower side are directions used for explanation only, and do not limit the actual positional relationship and direction. In addition, unless otherwise specified, the direction parallel to the central axis J (the Z-axis direction) is simply referred to as the "axial direction" or the "vertical direction", and the radial direction around the central axis J is simply referred to as the "radial direction". The circumferential direction around the central axis J, that is, the circumference of the central axis J is simply called the "circumferential direction". Furthermore, in the following description, "planar view" means a state viewed from the axial direction.

<Motor> FIG. 1 is a schematic cross-sectional view of the motor 1 . A control device (external device) 9 is connected to the motor 1 . The control device 9 supplies power to the motor 1 through a control terminal 9a and controls the rotation of the motor 1 .

The motor 1 includes a rotor 3, a stator 4, a housing 2, a bearing holder 5, an upper bearing 6A, a lower bearing 6B, a neutral point busbar unit 10, and a phase busbar unit (busbar unit) 20. , provided.

The rotor 3 rotates around a central axis J extending in the vertical direction. The rotor 3 has a shaft 3a, a rotor core 3b, and a rotor magnet 3c. The shaft 3a is arranged along the central axis J centered on the central axis J extending in the vertical direction (axial direction). The shaft 3a is rotatably supported around the central axis J by an upper bearing 6A and a lower bearing 6B. The rotor core 3b is fixed to the outer peripheral surface of the shaft 3a. The rotor magnet 3c is fixed to the outer peripheral surface of the rotor core 3b.

The housing 2 has a cylindrical shape that opens upward (+Z side). Housing 2 accommodates rotor 3 , stator 4 and bearing holder 5 . The housing 2 has a cylindrical portion 2a and a bottom portion 2b. The cylindrical portion 2a surrounds the stator 4 from the radial outside. The bottom portion 2b is positioned at the lower end of the tubular portion 2a. A lower bearing holding portion 2c that holds the lower bearing 6B is provided at the center of the bottom portion 2b in plan view.

The bearing holder 5 is positioned above the stator 4 . Moreover, the bearing holder 5 is positioned between the phase busbar unit 20 and the neutral point busbar unit 10 in the axial direction. That is, the bearing holder 5 is positioned between the phase busbar unit 20 and the stator 4 in the axial direction. The bearing holder 5 is made of metal. A bearing holder 5 is held on the inner peripheral surface of the housing 2 . The bearing holder 5 holds the upper bearing 6A.

The bearing holder 5 has an upper bearing holding portion 5a. The upper bearing holding portion 5a holds the upper bearing 6A. The upper bearing holding portion 5a is positioned at the center of the bearing holder 5 in plan view. The upper bearing holding portion 5a has a holding cylinder portion 5aa that extends axially about the central axis J, and an upper end projecting portion 5ab that extends radially inward from the upper end of the holding cylinder portion 5aa. The upper end projecting portion 5ab positions the upper bearing 6A in the vertical direction. A hole portion 5c is provided in the center of the upper end projecting portion 5ab in a plan view so as to extend therethrough in the axial direction. The hole 5c allows the shaft 3a to pass therethrough.

The bearing holder 5 is provided with a coil wire passage hole 5d and a positioning hole portion 5e that penetrate vertically. The coil wire passage hole 5d allows the coil wire 7a drawn out from the coil 7 and connected to the phase busbar unit 20 to pass therethrough. A positioning projection 39 extending downward from the phase busbar unit 20 is inserted into the positioning hole 5e.

The stator 4 is annularly arranged around the central axis J. As shown in FIG. The stator 4 is radially opposed to the rotor 3 with a gap therebetween. The stator 4 surrounds the radially outer side of the rotor 3 . Stator 4 is fixed to the inner peripheral surface of housing 2 . The stator 4 has an annular stator core 4a, a pair of insulators 4b attached to the stator core 4a from above and below, and a coil 7 wound around the stator core 4a via the insulators 4b.

The plurality of coils 7 of this embodiment form a three-phase circuit of a plurality of systems (two systems in this embodiment). In each system, the U-phase, V-phase and W-phase coils 7 are Y-connected. The stator 4 of this embodiment is provided with 12 coils 7 . A coil wire 7 a extends from each coil 7 . Of the twelve coil wires 7 a , six coil wires 7 a are connected to phase busbars 21 of phase busbar unit 20 . The other six coil wires 7 a are connected to the neutral point busbar 11 of the neutral point busbar unit 10 .

The neutral point busbar unit 10 is positioned above the stator 4 . The neutral point busbar unit 10 has a neutral point busbar holder 12 and a plurality of (two in this embodiment) neutral point busbars 11 . The neutral point busbar holder 12 holds the neutral point busbar 11 . In this embodiment, the neutral point busbar unit 10 is provided with a pair of neutral point busbars 11 .

The neutral point busbar holder 12 extends along a plane perpendicular to the central axis J. As shown in FIG. The neutral point busbar holder 12 has legs 12a. The leg portion 12a extends downward along the axial direction. The lower ends of the legs 12a contact the upper surface of the stator core 4a. Further, the neutral point busbar holder 12 has a support portion 12b. The support portion 12b extends upward along the axial direction. The support portion 12 b surrounds the coil wire 7 a and prevents the coil wire 7 a from coming into contact with the coil wire passing hole 5 d of the bearing holder 5 .

Each neutral point busbar 11 has three coil wire connection portions 11a. The neutral point bus bar 11 is connected to the coil wire 7a at the coil wire connection portion 11a. The neutral point bus bar 11 connects coil wires 7a extending from different coils 7 to each other to form a neutral point of a three-phase circuit.

(Phase Busbar Unit) The phase busbar unit 20 is positioned above the bearing holder 5 . The phase busbar unit 20 is interposed between the coil wire 7a drawn out to the upper side of the bearing holder 5 and the control device 9 to electrically connect them.

FIG. 2 is an exploded view of the phase busbar unit 20. As shown in FIG. The phase busbar unit 20 includes a plurality of (six in this embodiment) phase busbars (busbars) 21, a plurality of (six in this embodiment) external connection terminals 27, a busbar holder 30, and a pair of covers. It has a member 41 and a pair of terminal receiving members 45 . Phase bus bar 21 , external connection terminal 27 , bus bar holder 30 , cover member 41 and terminal receiving member 45 are positioned above stator 4 .

3 is a plan view of the phase busbar 21 and the busbar holder 30. FIG. The phase busbar 21 has a busbar body portion 22 , a terminal connection portion 23 , and a coil wire connection portion 24 . The phase bus bar 21 is plate-shaped and formed by press working. The phase busbar 21 is processed so that the axial direction of the busbar main body portion 22 and the terminal connection portion 23 is the plate thickness direction. In addition, the phase bus bar 21 is processed so that the direction perpendicular to the axial direction is the plate thickness direction at the coil wire connecting portion 24 .

Phase busbar 21 is embedded inside busbar holder 30 at busbar body portion 22 and terminal connection portion 23 . That is, the busbar holder 30 is manufactured by insert molding in which the phase busbar 21 is embedded.

The busbar body portion 22 linearly extends along a plane perpendicular to the axial direction. A terminal connection portion 23 is connected to one end of the busbar body portion 22 . A coil wire connection portion 24 is connected to the other end of the busbar body portion 22 .

The coil wire connecting portion 24 is connected to the coil wire 7a. The coil wire connecting portion 24 holds the coil wire 7a. The planar view shape of the coil wire connecting portion 24 is a substantially U shape that opens radially outward.

The terminal connection portion 23 holds the external connection terminal 27 . The terminal connection portion 23 is provided with an insertion hole 23a penetrating in the axial direction. An external connection terminal 27 is press-fitted into the insertion hole 23a from below. Thereby, the phase bus bar 21 and the external connection terminal 27 are mechanically and electrically connected.

The terminal connection portion 23 may be connected to the busbar body portion 22 by laser welding. In this case, welding traces due to laser welding remain on the boundary portion between the terminal connection portion 23 and the busbar body portion 22 . When the terminal connection portion 23 is formed separately from the busbar main body portion 22 , the terminal connection portion 23 can be press-molded in a common mold for the plurality of phase busbars 21 . As a result, the dimensional variation of the terminal connection portion 23 can be suppressed, and the stability of the connection between the terminal connection portion 23 and the external connection terminal 27 can be enhanced.

Phase busbar 21 may have a crank portion located between terminal connection portion 23 and busbar body portion 22 . The crank portion is bent into a crank shape so that the axial positions of the terminal connection portion 23 and the busbar body portion 22 are different from each other. By providing the crank portion on the phase busbar 21, the stress transmitted from the terminal connection portion 23 to the busbar main body portion 22 side can be absorbed by the elastic deformation of the crank portion.

A plurality of (six in this embodiment) phase busbars 21 are classified into a first busbar group 28 and a second busbar group 29 . Each of the first busbar group 28 and the second busbar group 29 includes a plurality of (three in the present embodiment) phase busbars 21 .

Phase busbars 21 belonging to first busbar group 28 and second busbar group 29 are connected to coils 7 of different systems, respectively. The three coils connected to the three phase busbars 21 of the first busbar group 28 form one system of three-phase circuits, and the three coils connected to the three phase busbars 21 of the second busbar group 29 A coil constitutes a three-phase circuit of another system. First busbar group 28 and second busbar group 29 include a U-phase busbar, a V-phase busbar, and a W-phase busbar, respectively. That is, the three phase busbars 21 of the first busbar group 28 and the second busbar group 29 are connected to the U-phase, V-phase, and W-phase coils 7, respectively.

As shown in FIG. 3 , the phase busbars 21 of the first busbar group 28 and the phase busbars 21 of the second busbar group 29 are arranged point-symmetrically about the central axis J. As shown in FIG. Further, in the first busbar group 28 and the second busbar group 29, the phase busbars 21 of the same phase have the same shape. Therefore, in the phase busbar unit 20, the number of parts can be reduced.

The busbar holder 30 is made of a resin material. The busbar holder 30 is provided on the upper side (one side in the axial direction) of the stator. The busbar holder 30 supports the phase busbar 21 . The busbar holder 30 has a holder main body portion 31 , a tubular portion 33 , a plurality of ribs 32 , and a positioning convex portion 39 .

The holder main body 31 extends along a plane orthogonal to the central axis J. As shown in FIG. The holder main body 31 has an upper surface 31a facing upward (one side in the axial direction) and a lower surface 31b facing downward (the other side in the axial direction) (see FIG. 2). The busbar body portion 22 and the terminal connection portion 23 of the phase busbar 21 are embedded in the holder body portion 31 . Thereby, the holder body portion 31 holds the phase bus bar 21 .

A central hole 35 centered on the central axis J is provided in the holder body portion 31 . A central hole 35 extends axially therethrough. The central hole 35 is circular when viewed from the axial direction. The central hole 35 allows the shaft 3a to pass therethrough.

As shown in FIG. 3, the holder body portion 31 is divided into a central region 31A, a pair of body portion embedding regions 31B, and a pair of connection portion embedding regions 31C. The central region 31A surrounds the central hole 35 from the radial outside. In other words, central hole 35 is located in central region 31A.

The busbar body portions 22 of the phase busbars 21 are embedded in the pair of body portion embedding regions 31B, respectively. The pair of body portion embedding regions 31B are located radially outside the central region 31A. The pair of body portion embedded regions 31B are arranged on opposite sides in the radial direction with the central region 31A interposed therebetween when viewed in the axial direction. Three phase busbars 21 belonging to the first busbar group 28 are embedded in one of the pair of body portion embedding regions 31B, and three phase busbars 21 belonging to the second busbar group 29 are embedded in the other. . Therefore, the first busbar group 28 and the second busbar group 29 are arranged on opposite sides in the radial direction with the central hole 35 interposed therebetween when viewed in the axial direction.

The terminal connection portions 23 of the phase busbars 21 are embedded in the pair of connection portion embedding regions 31C, respectively. One of the pair of connection portion embedding regions 31C is located radially outside one main body portion embedding region 31B and embeds the three terminal connection portions 23 of the first busbar group 28 therein. The other of the pair of connection portion embedding regions 31C is positioned radially outside the other body portion embedding region 31B and embeds the three terminal connection portions 23 of the second bus bar group 29 therein. The connection portion embedding region 31C is provided with an opening 38 for exposing the insertion hole 23a of the terminal connection portion 23 and the vicinity thereof in the vertical direction.

As shown in FIG. 1, the tubular portion 33 extends axially from the periphery of the central hole 35 . In this embodiment, the tubular portion 33 extends downward. That is, the cylindrical portion 33 protrudes downward from the lower surface 31 b of the holder body portion 31 . The outer peripheral surface of the cylindrical portion 33 is circular when viewed from the axial direction. In addition, the inner peripheral surface of the cylindrical portion 33 matches the inner peripheral surface of the central hole 35 when viewed in the axial direction.

The outer peripheral surface of the tubular portion 33 fits into the hole portion 5c provided in the bearing holder 5. As shown in FIG. Thereby, the phase busbar unit 20 is radially positioned.

As shown in FIG. 1 , the rib 32 is provided on the lower surface (one surface facing the axial direction) 31 b of the holder main body portion 31 . Therefore, the rib 32 protrudes downward from the lower surface 31b of the holder main body portion 31 . As shown in FIG. 3 , the plurality of ribs 32 radially extend radially outward from the tubular portion 33 .

As shown in FIG. 1 , the positioning protrusion 39 is provided on the lower surface (one surface facing the axial direction) 31 b of the holder main body 31 . The positioning protrusion 39 protrudes downward (toward the stator 4 ) from the lower surface 31 b of the holder main body 31 . The positioning protrusion 39 fits into the positioning hole 5 e of the bearing holder 5 . Thereby, the busbar holder 30 is positioned in the circumferential direction.

FIG. 4 is a schematic diagram for more specifically explaining the positioning structure of the busbar holder 30 with respect to the bearing holder 5. As shown in FIG. 4, illustration of the coil wire passing hole 5d provided in the bearing holder 5 is omitted.

As shown in FIG. 4, the cylindrical portion 33 of the busbar holder 30 is fitted into the hole portion 5c provided in the center of the bearing holder 5. As shown in FIG. Thereby, the busbar holder 30 is radially positioned with respect to the bearing holder 5 .

The bearing holder 5 is provided with a pair of positioning holes 5e. In this embodiment, the positioning hole 5e penetrates vertically. However, the positioning hole 5e does not have to open downward as long as it is a hole that opens upward.

The pair of positioning holes 5e are arranged at symmetrical positions with respect to the central axis J. As shown in FIG. That is, the pair of positioning holes 5e are arranged at regular intervals along the circumferential direction. A positioning protrusion 39 is fitted into one of the pair of positioning holes 5e.

According to this embodiment, the positioning protrusion 39 of the busbar holder 30 may be inserted into any of the pair of positioning holes 5e. Therefore, the busbar holder 30 can be assembled by rotating it 180 degrees with respect to the bearing holder 5 . As a result, the phase busbar unit 20 can be easily handled during assembly of the motor 1, and the assembly process can be simplified. In this embodiment, the pair of positioning hole portions 5e may be long holes extending in the radial direction. In this case, the elongated hole contacts the positioning protrusion 39 on one circumferential side and the other circumferential side.

As shown in FIG. 2, the external connection terminal 27 extends along the axial direction. The external connection terminal 27 is formed by punching a plate material in the thickness direction. The external connection terminal 27 is inserted into an insertion hole 23 a provided in the terminal connection portion 23 of the phase bus bar 21 . The external connection terminal 27 of the present embodiment is provided with a slit 27a extending downward from the upper end. A control terminal 9a of the control device 9 is inserted into the slit 27a. Thereby, the control device 9 is connected to the motor 1 via the external connection terminal 27 .

According to the present embodiment, the external connection terminal 27 and the phase bus bar 21 are configured as separate members. Therefore, even when the phase bus bar 21 has a complicated shape, the yield can be improved by increasing the number of pieces taken from the plate material.

In addition, according to the present embodiment, the external connection terminals 27 and the phase bus bar 21 are formed of separate members, so materials suitable for each application can be used. In this embodiment, the material properties required for the external connection terminal 27 and the phase bus bar 21 are different from each other. Since the external connection terminal 27 receives stress in the axial direction from the control device 9 when it is connected to the control device 9, it is preferably made of a highly rigid material that does not easily buckle. On the other hand, since the phase bus bar 21 has a complicated shape, it is preferably made of a low-rigidity material so as to reduce punching stress and bending stress due to pressing. According to this embodiment, since the external connection terminals 27 and the phase busbar 21 are formed of separate members, the phase busbar unit 20 as a whole can be manufactured at low cost while satisfying the material properties required for each part.

According to the present embodiment, since the external connection terminals 27 and the phase busbars 21 are formed of separate members, the thicknesses of the external connection terminals 27 and the phase busbars 21 can be made different from each other. The thickness of the external connection terminal 27 is preferably increased in order to suppress buckling. On the other hand, it is preferable that the phase bus bar 21 has a small plate thickness in order to improve workability. When the external connection terminal 27 and the phase bus bar 21 are processed from a single plate material, the overall plate thickness must be the same as the plate thickness of the portion that requires rigidity, resulting in a large manufacturing cost as a whole. Become. According to the present embodiment, since the external connection terminals 27 and the phase busbars 21 are formed of separate members, the rigidity required for the external connection terminals 27 and the phase busbars 21 is taken into account. , the plate thickness of the external connection terminal 27 and the phase bus bar 21 can be set individually. Therefore, the external connection 27 and the phase bus bar 21 can be manufactured at a lower cost than when processed from a single plate material.

According to this embodiment, since the external connection terminals 27 and the phase bus bar 21 are made of separate members, the plurality of external connection terminals 27 can be manufactured using the same mold. Therefore, the dimensional variation of the external connection terminals 27 can be stabilized. The external connection terminal 27 is electrically connected to the control device 9 by inserting the control terminal 9a of the control device 9 into the slit 27a. By stabilizing the dimensional variation of the external connection terminals 27, the stability of the electrical connection between the external connection terminals 27 and the control device 9 can be enhanced.

According to this embodiment, the external connection terminals 27 are inserted into the insertion holes 23 a of the phase bus bar 21 . Therefore, the process of assembling the external connection terminal 27 to the phase bus bar 21 can be simplified. Further, according to this embodiment, the external connection terminal 27 is press-fitted into the insertion hole 23a. Therefore, the external connection terminal 27 and the phase bus bar 21 can be electrically connected only by the press-fitting process, and the manufacturing process can be simplified. After inserting the external connection terminal 27 into the insertion hole 23a, the external connection terminal 27 and the phase bus bar 21 may be joined by welding such as laser welding.

FIG. 5 is an enlarged view of area V in FIG. In FIG. 5, the external connection terminals 27 to be inserted into the insertion holes 23a are indicated by imaginary lines (chain lines). As shown in FIG. 5, the external connection terminal 27 has a pair of first surfaces 27c facing in the plate thickness direction and a pair of second surfaces 27d facing in the plate width direction. The plane directions of the first surface 27c and the second surface 27d are orthogonal to each other.

The external connection terminal 27 contacts the inner peripheral surface of the insertion hole 23a on the second surface 27d. On the other hand, a gap is provided between the first surface 27c of the external connection terminal 27 and the inner peripheral surface of the insertion hole 23a.

Since the external connection terminal 27 is formed by punching a plate material in the thickness direction, it is easy to improve the dimensional accuracy in the plate width direction, but it is difficult to manage the dimensional accuracy in the plate thickness direction. That is, in the external connection terminal 27, it is easy to improve the precision of the distance dimension between the pair of second surfaces 27d, and it is difficult to improve the precision of the distance dimension between the pair of first surfaces 27c.

According to the present embodiment, the second surface 27d, whose dimensions are relatively easy to manage, contacts the inner peripheral surface of the insertion hole 23a, so that the holding force of the external connection terminal 27 after press-fitting can be stabilized. On the other hand, since the first surface 27c, whose dimensions are relatively difficult to manage, is arranged apart from the inner peripheral surface of the insertion hole 23a, the dimensions of the first surface 27c hardly affect the press-in force. Therefore, the external connection terminal 27 can be stably press-fitted into the insertion hole 23a. In addition, in this embodiment, both the pair of first surfaces 27c are arranged apart from the insertion hole 23a. However, it is sufficient that a gap is provided between at least one of the pair of first surfaces 27c and the insertion hole 23a.

The terminal receiving member 45 has a plate shape extending along a plane perpendicular to the axial direction. The terminal receiving member 45 is fixed to the lower surface 31b of the holder body portion 31. As shown in FIG. That is, the terminal receiving member 45 is positioned below the busbar holder 30 and fixed to the busbar holder 30 . The terminal receiving member 45 is positioned below the connecting portion embedding region 31</b>C of the holder body portion 31 .

The terminal receiving member 45 has a backup surface 45a facing upward. The backup surface 45 a contacts the lower ends of the external connection terminals 27 . The external connection terminal 27 receives downward stress from the control terminal 9 a of the control device 9 when it is connected to the control device 9 . The terminal receiving member 45 supports the external connection terminal 27 from below on the backup surface 45 a and suppresses the external connection terminal 27 from coming off from the insertion hole 23 a of the phase bus bar 21 .

A plurality of reinforcing ribs 45b are provided on the backup surface 45a. The reinforcing ribs 45b are arranged to avoid areas in contact with the lower ends of the external connection terminals 27 on the backup surface 45a. The reinforcing rib 45b is provided to reinforce the terminal receiving member 45 and increase its rigidity.

The terminal receiving member 45 has a rotationally symmetrical shape when viewed from the axial direction. Therefore, even if the terminal receiving member 45 is rotated by 180° when viewed from the axial direction, it can be assembled to the busbar holder 30 . That is, according to the present embodiment, handling of the terminal receiving members 45 during assembly of the phase busbar unit 20 is facilitated, and the assembly process can be simplified.

The cover member 41 is fixed to the upper surface 31 a of the holder body portion 31 . That is, the cover member 41 is positioned above the busbar holder 30 and fixed to the busbar holder 30 . The pair of cover members 41 are positioned above the connecting portion embedding region 31</b>C of the holder body portion 31 .

The cover member 41 has three rectangular tubular portions 41a. A terminal passage hole 41b is provided inside each rectangular tubular portion 41a so as to extend therethrough along the axial direction. The terminal passage hole 41b surrounds the external connection terminal 27. As shown in FIG. Thereby, the rectangular tubular portion 41 a protects the external connection terminal 27 .

(Busbar Holder, Terminal Receiving Member, and Cover Member Fixing Structure) Next, a structure for fixing the busbar holder 30, the terminal receiving member 45, and the cover member 41 to each other will be described. FIG. 6 is an enlarged view of area VI in FIG. FIG. 7 is a partial cross-sectional view of busbar holder 30, terminal receiving member 45, and cover member 41. As shown in FIG.

As shown in FIG. 6, the busbar holder 30 has a first protrusion 51 protruding downward and a second protrusion 52 protruding upward. The first convex portion 51 is provided on the lower surface 31 b of the holder body portion 31 . The second convex portion 52 is provided on the upper surface 31 a of the holder body portion 31 . The first convex portion 51 and the second convex portion 52 overlap when viewed from the axial direction.

The first convex portion 51 has a columnar portion 51a and a plurality of (four in the present embodiment) ribs (crush ribs) 51c. The columnar portion 51a extends in a columnar shape along the vertical direction. The rib 51c protrudes radially outward of the columnar portion 51a from the outer peripheral surface of the columnar portion 51a. Moreover, the rib 51c extends in the vertical direction from the lower end to the upper end of the columnar portion 51a. In the present embodiment, the rib 51c has a prismatic shape elongated in the vertical direction. The plurality of ribs 51c are arranged at regular intervals along the circumferential direction of the columnar portion 51a.

The second protrusion 52 has substantially the same shape as the first protrusion 51 . That is, the second convex portion 52 has a columnar portion 52a and a plurality of (four in this embodiment) ribs (crush ribs) 52c. In the second convex portion 52 , the columnar portion 52 a and the ribs 52 c have the same configurations as those of the first convex portion 51 .

As shown in FIG. 7, the terminal receiving member 45 is provided with a first concave portion 56 into which the first convex portion 51 is inserted. The first recessed portion 56 is recessed downward on the upper surface of the terminal receiving member 45 . A stepped portion 56 a that increases the diameter of the first recess 56 is provided at the opening of the first recess 56 . That is, the diameter of the first recessed portion 56 increases above the stepped portion 56a. In this embodiment, the stepped portion 56a has a tapered shape that increases in diameter toward the opening end of the first recessed portion 56 .

The first protrusion 51 is press-fitted into the first recess 56 . In FIG. 7 , the outer shape indicated by a two-dot chain line is the outer shape of the rib 51 c of the first convex portion 51 before being press-fitted into the first concave portion 56 . When the first convex portion 51 is press-fitted into the first concave portion 56, each rib 51c is plastically and elastically deformed radially inwardly of the columnar portion 51a. Therefore, force is applied to the rib 51c in the direction from the inner peripheral surface of the first recess 56 toward the columnar portion 51a. Therefore, the terminal receiving member 45 can be firmly fixed to the busbar holder 30 . Moreover, since the terminal receiving member 45 can be assembled to the busbar holder 30 only by the press-fitting process, the process of assembling the phase busbar unit 20 can be simplified.

In this embodiment, the case where the rib (crash rib) 51c is provided on the outer peripheral surface of the first convex portion 51 has been described. However, crush ribs may be provided on the inner peripheral surface of the first recess 56 . That is, it is sufficient that crush ribs extending along the axial direction are provided on the outer peripheral surface of the first convex portion 51 or the inner peripheral surface of the first concave portion 56 .

Further, in the present embodiment, the case where the busbar holder 30 is provided with the first protrusion 51 and the terminal receiving member 45 is provided with the first recess 56 has been described. However, the terminal receiving member 45 may be provided with the first protrusion 51 and the busbar holder 30 may be provided with the first recess 56 . That is, it is sufficient that one of the terminal receiving member 45 and the busbar holder 30 is provided with the first protrusion 51 and the other is provided with the first recess 56 .

When the first convex portion 51 is press-fitted into the first concave portion 56 , there is a risk that a portion of the rib 51 c may be scraped off and sandwiched between the busbar holder 30 and the terminal receiving member 45 . When a part of the scraped rib 51 c is sandwiched between the busbar holder 30 and the terminal receiving member 45 , the terminal receiving member 45 is lifted from the busbar holder 30 . According to the present embodiment, since the stepped portion 56a is provided at the opening of the first recess 56, part of the cut rib 51c is accommodated above the stepped portion 56a. Therefore, according to the present embodiment, it is possible to prevent the terminal receiving member 45 from floating with respect to the busbar holder 30 . In addition, it is possible to prevent a part of the scraped rib 51 c from scattering inside the motor 1 .

The cover member 41 is provided with a second concave portion 57 into which the second convex portion 52 is inserted. The second recess 57 has substantially the same shape as the first recess 56 . The second recess 57 is recessed upward on the lower surface of the cover member 41 . A stepped portion 57 a that increases the diameter of the second recess 57 is provided at the opening of the second recess 57 . In this embodiment, the stepped portion 57a has a tapered shape that increases in diameter toward the opening end of the second recessed portion 57 .

The second protrusion 52 is press-fitted into the second recess 57 . When the second convex portion 52 is press-fitted into the second concave portion 57, each rib 52c is plastically and elastically deformed radially inwardly of the columnar portion 52a. Therefore, the cover member 41 can be firmly fixed to the busbar holder 30 . Moreover, since the cover member 41 can be assembled to the busbar holder 30 only by the press-fitting process, the process of assembling the phase busbar unit 20 can be simplified.

In this embodiment, the case where the rib (crush rib) 52c is provided on the outer peripheral surface of the second convex portion 52 has been described. However, the crush rib may be provided on the inner peripheral surface of the second recess 57 . That is, it is sufficient that crush ribs extending along the axial direction are provided on the outer peripheral surface of the second convex portion 52 or the inner peripheral surface of the second concave portion 57 .

Further, in the present embodiment, the case where the busbar holder 30 is provided with the second protrusion 52 and the cover member 41 is provided with the second recess 57 has been described. However, it is sufficient that one of the cover member 41 and the busbar holder 30 is provided with the second protrusion 52 and the other is provided with the second recess 57 .

According to the present embodiment, the first protrusion 51 and the second protrusion 52 overlap each other when viewed from the axial direction. The step of press-fitting into the second recess 57 can be performed at the same time. Therefore, further simplification of the assembly process of the phase busbar unit 20 can be realized.

Further, according to the present embodiment, since the stepped portion 57a is provided at the opening of the second concave portion 57, part of the cut rib 52c is accommodated below the stepped portion 57a. Therefore, according to the present embodiment, it is possible to prevent the cover member 41 from floating with respect to the busbar holder 30 . In addition, it is possible to prevent a part of the scraped rib 52 c from scattering inside the motor 1 .

(Modification 1) Next, Modification 1 of the fixing structure of the busbar holder 130, the terminal receiving member 145, and the cover member 141 that can be employed in the above embodiment will be described. FIG. 8 is a partial cross-sectional view of busbar holder 130, terminal receiving member 145, and cover member 141 that employ the fixing structure of Modification 1. As shown in FIG. In addition, the description is abbreviate|omitted about the component of the same aspect as the above-mentioned embodiment.

The terminal receiving member 145 is provided with a first protrusion 151 protruding upward. A rib (crush rib) 151 c is provided on the outer peripheral surface of the first convex portion 151 . The busbar holder 130 is provided with a fixing hole (first concave portion) 156 into which the first convex portion 151 is inserted. The fixing hole 156 penetrates the busbar holder 130 along the axial direction. A stepped portion 156a is provided at the opening at the lower end of the fixing hole 156 to increase the diameter of the fixing hole 156 at the open end.

The first protrusion 151 is press-fitted into the fixing hole 156 . As a result, the ribs 151 c are deformed, and the terminal receiving member 145 can be firmly fixed to the busbar holder 130 . A part of the rib 151c shaved by the press-fitting of the first projection 151 is accommodated below the stepped portion 156a of the fixing hole 156. As shown in FIG. Therefore, ribs 151 c can be prevented from affecting assembly of terminal receiving member 145 and busbar holder 130 .

The busbar holder 130 is provided with a second protrusion 152 that protrudes upward. A rib (crush rib) 152c is provided on the outer peripheral surface of the second protrusion 152 . The second convex portion 152 overlaps the first convex portion 151 when viewed from the axial direction. The cover member 141 is provided with a second concave portion 157 into which the second convex portion 152 is inserted. The second recess 157 is recessed upward from the lower surface of the cover member 141 . The opening at the lower end of the second recess 157 is provided with a stepped portion 157a that increases the diameter of the second recess 157 at the opening end.

The second protrusion 152 is press-fitted into the second recess 157 . As a result, the ribs 152 c are deformed, and the cover member 141 can be firmly fixed to the busbar holder 130 . A part of the rib 152c shaved by the press-fitting of the second convex portion 152 is accommodated below the stepped portion 157a of the second concave portion 157. As shown in FIG. Therefore, ribs 152 c can be prevented from affecting assembly of cover member 141 and busbar holder 130 .

Note that in this modification, in the relationship between the first protrusion 151 and the fixing hole 156 and the relationship between the second protrusion 152 and the second recess 157, ribs (crush ribs) are provided on the outer peripheral surface of the protrusion. explained. However, the crush rib may be provided on the inner peripheral surface of the recess.

(Modification 2) Modification 2 of the fixing structure of the busbar holder 230, the terminal receiving member 245, and the cover member 241 that can be employed in the above embodiment will be described. FIG. 9 is a partial cross-sectional view of busbar holder 230, terminal receiving member 245, and cover member 241 that employ the fixing structure of modification 2. As shown in FIG. In addition, the description is abbreviate|omitted about the component of the same aspect as the above-mentioned embodiment.

The terminal receiving member 245 is provided with a protrusion 253 protruding upward. The convex portion 253 has a large diameter portion 254 and a small diameter portion 255 . The large diameter portion 254 and the small diameter portion 255 are arranged along the axial direction. The large diameter portion 254 has a convex portion 253
located in the region on the root side of the The small diameter portion 255 is located at the tip of the large diameter portion 254 . The small diameter portion 255 has a smaller diameter than the large diameter portion 254 . That is, the convex portion 253 is a stepped projection that is thick on the root side and thin on the tip side. A rib (crush rib) 254c is provided on the outer peripheral surface of the large diameter portion 254 . Similarly, the outer peripheral surface of the small diameter portion 255 is provided with ribs (crush ribs) 255c.

The busbar holder 230 is provided with a through hole 258 that penetrates in the axial direction and into which the large diameter portion 254 is inserted. A stepped portion 258a is provided at the opening at the lower end of the through hole 258 to increase the diameter of the through hole 258 at the open end.

The cover member 241 is provided with a recess 259 into which the small diameter portion 255 is inserted. The recess 259 is recessed upward from the lower surface of the cover member 241 . A stepped portion 259a is provided at the opening at the lower end of the recess 259 to increase the diameter of the recess 259 at the open end.

The protrusion 253 is press-fitted into the recess 259 at the small-diameter portion 255 and press-fit into the through-hole 258 at the large-diameter portion 254 . As a result, ribs 254 c and 255 c are deformed, and terminal receiving member 245 and cover member 241 can be firmly fixed to busbar holder 230 . Also, parts of the ribs 254c and 255c cut by press-fitting are accommodated below the stepped portions 258a and 259a, respectively. Therefore, the parts of ribs 254 c and 255 c shaved by press-fitting can be prevented from affecting the assembly of terminal receiving member 245 and cover member 241 to busbar holder 230 .

In this modified example, a case where ribs (crush ribs) are provided on the outer peripheral surfaces of the large diameter portion 254 and the small diameter portion 255 has been described. However, crush ribs may be provided on the outer peripheral surface of the large diameter portion 254 or the inner peripheral surface of the through hole 258 . Similarly, crush ribs may be provided on the outer peripheral surface of the small diameter portion 255 or the inner peripheral surface of the recess 259 .

Further, in this modified example, the terminal receiving member 245 is provided with the protrusion 253 and the cover member 241 is provided with the recess 259 . However, it is sufficient that one of the terminal receiving member 245 and the cover member 241 is provided with the convex portion 253 and the other is provided with the concave portion 259 .

(Modification 3) Next, Modification 3 of the terminal receiving member 345 that can be employed in the above embodiment will be described. FIG. 10 is a partial cross-sectional view of a terminal receiving member 345 of Modification 3. As shown in FIG. In FIG. 10, three external connection terminals 27 supported by the terminal receiving member 345 are indicated by two-dot chain lines. In addition, the description is abbreviate|omitted about the component of the same aspect as the above-mentioned embodiment.

As shown in FIG. 10, the three external connection terminals 27 are arranged side by side when viewed in the axial direction. Here, of the three external connection terminals 27 when viewed from the axial direction, the pair of external connection terminals 27 arranged at both ends is referred to as a first external connection terminal 27A. Also, among the three external connection terminals 27, one external connection terminal 27 arranged between the first external connection terminals 27A is called a second external connection terminal 27B. When viewed from the axial direction, the second external connection terminal 27B is arranged so as to be shifted in a direction perpendicular to the virtual straight line VL connecting the pair of first external connection terminals 27A.

The terminal receiving member 345 supports the pair of first external connection terminals 27A and one second external connection terminal 27B from below. The terminal receiving member 345 has a rotationally symmetric shape when viewed from the axial direction.

The terminal receiving member 345 has an upper surface 345a facing upward. A concave portion 346 is provided in the upper surface 345a. The recess 346 is recessed downward in the upper surface 345a. The recess 346 has a bottom surface 347 facing upward. The bottom surface 347 extends along a plane perpendicular to the axial direction.

According to this modified example, the recess 346 is provided in the upper surface 345 a of the terminal receiving member 345 , so that the terminal receiving member 345 is provided with a thick portion so as to surround the recess 346 . Therefore, the rigidity of the terminal receiving member 345 can be increased.

A bottom surface 347 of the concave portion 346 extends along the imaginary straight line VL with the imaginary straight line VL as its longitudinal direction. A bottom surface 347 of the concave portion 346 has a symmetrical shape with respect to the imaginary straight line VL when viewed from the axial direction.

The bottom surface 347 has a pair of end regions 347a and one intermediate region 347b. A pair of end regions 347a and one middle region 347b are continuous planes. The intermediate region 347b is positioned between the pair of end regions 347a. The one end region 347a, the intermediate region 347b, and the other end region 347a are arranged in this order along the virtual straight line VL. The middle region 347b is wider than the pair of end regions 347a. More specifically, the width dimension of the intermediate region 347b in the direction orthogonal to the imaginary straight line VL is larger than the width dimension of the pair of end regions 347a in the direction orthogonal to the imaginary straight line VL. In this specification, the width direction of the bottom surface 347 means a direction orthogonal to the imaginary straight line VL.

The bottom surface 347 contacts the lower ends of the first external connection terminals 27A at a pair of end regions 347a. Also, the bottom surface 347 contacts the lower end of the second external connection terminal 27B in the intermediate region 347b. The lower ends of the second external connection terminals 27B are arranged to be biased toward one side in the width direction of the bottom surface 347 in the intermediate region 347b.

According to this modified example, since the intermediate region 347b is wider than the end regions 347a, even if the terminal receiving member 345 is rotated 180° when viewed from the axial direction, the intermediate region 347b has the second The lower ends of the external connection terminals 27B can be stably brought into contact with each other. That is, according to the present embodiment, the terminal receiving member 345 can be easily handled when assembling the phase busbar unit 20, and the assembling process can be simplified.

(Modification 4) Next, Modification 4 of the positioning structure of the busbar holder 430 that can be employed in the above embodiment will be described with reference to FIG. 11 .

As shown in FIG. 11, the tubular portion 33 of the busbar holder 430 is fitted into the hole portion 5c provided in the center of the bearing holder 405. As shown in FIG. The busbar holder 430 is thus radially positioned with respect to the bearing holder 405 .

The bearing holder 405 of this modified example is provided with a positioning hole portion 405e and a retraction hole portion 405f. In this modified example, the positioning hole portion 405e and the retraction hole portion 405f are circular when viewed from the axial direction. Also, the diameter of the retraction hole portion 405f is larger than the diameter of the positioning hole portion 405e. In this modification, the positioning hole portion 405e and the retraction hole portion 405f penetrate vertically. However, the positioning hole portion 405e and the retraction hole portion 405f do not have to open downward as long as they are holes that open upward.

The positioning hole portion 405e and the retraction hole portion 405f are arranged at positions symmetrical to each other with the central axis J as the center. That is, the positioning holes 405e and the retraction holes 405f are arranged at equal intervals along the circumferential direction.

The busbar holder 430 of this modified example has a pair of positioning protrusions 439 . A pair of positioning protrusions 439 protrude downward (toward the stator 4 ) from the busbar holder 430 . The pair of positioning protrusions 439 are cylindrical. Also, the pair of positioning protrusions 439 have the same shape. The pair of positioning protrusions 439 are arranged symmetrically with respect to the central axis J. As shown in FIG.

One of the pair of positioning projections 439 fits into the positioning hole 405e. As a result, the busbar holder 430 is circumferentially positioned with respect to the bearing holder 405 . The other of the pair of positioning protrusions 439 is inserted into the retraction hole 405f. A gap is provided between the positioning convex portion 439 inserted into the evacuation hole portion 405f and the inner peripheral surface of the evacuation hole portion 405f. Therefore, the positioning protrusion 439 inserted into the retraction hole 405f does not affect the positioning of the busbar holder 430. As shown in FIG.

According to this modification, one of the pair of positioning protrusions 439 is fitted into the positioning hole 405e, and the other is inserted into the retraction hole 405f. Therefore, the busbar holder 430 can be assembled by rotating it 180 degrees with respect to the bearing holder 405 . As a result, the phase busbar unit 20 can be easily handled during assembly of the motor 1, and the assembly process can be simplified. In addition, in this modified example, the pair of positioning hole portions 405e may be long holes extending in the radial direction. In this case, the elongated hole contacts the positioning projections 439 on one circumferential side surface and the other circumferential side surface.

(Modification 5) Next, Modification 5 of the positioning structure of the busbar holder 530 that can be employed in the above embodiment will be described with reference to FIG. 12 .

A bearing holder 505 of this modified example is provided with a positioning hole portion 505e and a long hole positioning hole portion 505g. The positioning hole 505e is circular when viewed from the axial direction. On the other hand, the long hole positioning hole portion 505g has a long hole shape extending in the radial direction. In this modified example, the positioning hole portion 505e and the long hole positioning hole portion 505g penetrate vertically. However, the positioning hole portion 505e and the long hole positioning hole portion 505g do not have to open downward as long as they are holes that open upward.

The positioning hole portion 505e and the long hole positioning hole portion 505g are arranged at mutually symmetrical positions with the central axis J as the center. That is, the positioning hole portions 505e and the long hole positioning hole portions 505g are arranged at regular intervals along the circumferential direction.

A busbar holder 530 of this modified example has a pair of positioning protrusions 539 . A pair of positioning protrusions 539 protrude downward (toward the stator 4 ) from the busbar holder 530 . The pair of positioning protrusions 539 are cylindrical. Also, the pair of positioning protrusions 539 have the same shape. The pair of positioning protrusions 539 are arranged at positions symmetrical to each other with the central axis J as the center.

One of the pair of positioning projections 539 fits into the positioning hole 505e. The outer peripheral surface of the positioning protrusion 539 contacts the positioning hole 505e over the entire circumference. The other of the pair of positioning protrusions 539 fits into the elongated positioning hole 505g. The positioning convex portion 539 contacts the side surface on one circumferential side and the side surface on the other side of the long hole positioning hole portion 505g.

According to this modification, one of the pair of positioning projections 539 fits into the positioning hole 505e, and the other fits into the long hole positioning hole 505g. Thereby, the busbar holder 530 can be radially and circumferentially positioned with respect to the bearing holder 505 . Also, the busbar holder 530 can be assembled by rotating it by 180° with respect to the bearing holder 505 . As a result, the phase busbar unit 20 can be easily handled during assembly of the motor 1, and the assembly process can be simplified.

An embodiment of the present invention has been described above, but each configuration and combination thereof in one embodiment is an example, and addition, omission, replacement, and other modifications of the configuration can be made without departing from the scope of the present invention. can be changed. Moreover, the present invention is not limited by the embodiments.

Claims (17)

A busbar unit provided in a motor,



a plurality of bus bars positioned above the stator annularly arranged around a central axis extending in the vertical direction;



an external connection terminal extending along the axial direction,



The busbar is provided with an insertion hole penetrating in the axial direction,



The external connection terminal is inserted into the insertion hole,



busbar unit. The external connection terminal is plate-shaped and is press-fitted into the insertion hole,



The external connection terminal contacts the inner peripheral surface of the insertion hole on the surface facing the plate width direction,



2. The busbar unit according to claim 1, wherein a gap is provided between at least one surface of said external connection terminal in the plate thickness direction and an inner peripheral surface of said insertion hole. a busbar holder that supports the busbar;



a terminal receiving member positioned below the busbar holder and fixed to the busbar holder;



3. The busbar unit according to claim 1, wherein said terminal receiving member supports said external connection terminal from below. One of the terminal receiving member and the busbar holder is provided with a first protrusion projecting in the axial direction, and the other is provided with a first recess into which the first protrusion is inserted,



4. The busbar unit according to claim 3, wherein an outer peripheral surface of said first protrusion or an inner peripheral surface of said first recess is provided with a crush rib extending along the axial direction. 5. The busbar unit according to claim 4, wherein the opening of said first recess is provided with a stepped portion that increases the diameter of said first recess. a cover member positioned above the busbar holder and fixed to the busbar holder;



One of the busbar holder and the cover member is provided with a second protrusion projecting in the axial direction, and the other is provided with a second recess into which the second protrusion is inserted,



6. The busbar unit according to claim 4, wherein an outer peripheral surface of said second protrusion or an inner peripheral surface of said second recess is provided with a crush rib extending along the axial direction. 7. The busbar unit according to claim 6, wherein said first protrusion and said second protrusion overlap when viewed from the axial direction. 8. The busbar unit according to claim 6, wherein the opening of said second recess is provided with a stepped portion that increases the diameter of said second recess. a cover member positioned above the busbar holder and fixed to the busbar holder;



One of the terminal receiving member and the cover member is provided with a protrusion projecting in the axial direction, and the other is provided with a recess,



The convex portion has a large-diameter portion and a small-diameter portion positioned at the tip of the large-diameter portion and having a smaller diameter than the large-diameter portion,



The busbar holder is provided with a through hole through which the large diameter portion is inserted in the axial direction,



The small-diameter portion is inserted into the recess,



A crush rib extending along the axial direction is provided on the outer peripheral surface of the large diameter portion or the inner peripheral surface of the through hole,



4. The busbar unit according to claim 3, wherein an outer peripheral surface of said small diameter portion or an inner peripheral surface of said recess is provided with a crush rib extending along the axial direction. The busbar unit according to any one of claims 3 to 9, wherein said terminal receiving member has a rotationally symmetrical shape when viewed in the axial direction. comprising three external connection terminals arranged side by side when viewed from the axial direction;



When viewed from the axial direction, of the three external connection terminals, a pair of the external connection terminals arranged at both ends is defined as a first external connection terminal, and one external connection terminal arranged between the first external connection terminals. using the external connection terminal as a second external connection terminal,



When viewed from the axial direction, the second external connection terminals are arranged shifted in a direction orthogonal to the virtual straight line connecting the pair of the first external connection terminals,



A concave portion having a bottom surface is provided on the upper surface of the terminal receiving member,



the bottom surface of the recess includes a pair of end regions and an intermediate region positioned between the pair of end regions;



the bottom surface is in contact with the lower ends of the first external connection terminals in the pair of end regions, and in contact with the lower ends of the second external connection terminals in the intermediate region;



11. The busbar unit according to claim 10, wherein said intermediate region is wider than said end regions. A motor having the busbar unit according to any one of claims 1 to 11,



the stator around which the coil wire is wound;



A motor comprising a rotor radially opposed to the stator with a gap therebetween. a bearing holder positioned between the busbar unit and the stator in the axial direction;



The bearing holder is provided with a positioning hole opening upward,



The busbar unit has a busbar holder that supports the busbar,



13. The motor according to claim 12, wherein said busbar holder has a positioning protrusion that protrudes toward said stator and is fitted into said positioning hole. The bearing holder is provided with a pair of the positioning holes arranged at mutually symmetrical positions about the central axis,



14. The motor according to claim 13, wherein the positioning projection fits into one of the pair of positioning holes. The bearing holder is provided with a retraction hole that is arranged at a position symmetrical to the positioning hole about the central axis and opens upward,



The busbar unit has a pair of positioning protrusions arranged at symmetrical positions about the central axis, one of the pair of positioning protrusions fitting into the positioning hole, and the other of the pair of positioning protrusions fitting into the positioning hole. inserted into the evacuation hole,



14. The motor according to claim 13, wherein a gap is provided between the positioning protrusion inserted into the retraction hole and the inner peripheral surface of the retraction hole. The busbar holder has a cylindrical portion protruding downward about the central axis,



16. The motor according to claim 14, wherein the bearing holder is provided with a hole into which the outer peripheral surface of the tubular portion is fitted. The bearing holder is provided with an elongated positioning hole arranged at a position symmetrical to the positioning hole about the central axis, opening upward and extending in a radial direction,



The busbar unit has a pair of positioning protrusions arranged at symmetrical positions about the central axis,



14. The motor according to claim 13, wherein one of the pair of positioning projections is fitted into the positioning hole and the other is fitted into the long positioning hole.

Images