CN112005468A - Bus bar unit, motor, and electric power steering device - Google Patents
Bus bar unit, motor, and electric power steering device Download PDFInfo
- Publication number
- CN112005468A CN112005468A CN201980026627.5A CN201980026627A CN112005468A CN 112005468 A CN112005468 A CN 112005468A CN 201980026627 A CN201980026627 A CN 201980026627A CN 112005468 A CN112005468 A CN 112005468A
- Authority
- CN
- China
- Prior art keywords
- bus bar
- holder
- upper side
- phase
- unit according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
A bus bar unit (100) of the present invention includes: a plurality of bus bars; and two bus bar holders that hold the bus bars and are arranged at intervals in the axial direction, at least one of the bus bars held by the bus bar holder positioned on the upper side includes a terminal portion (145) to be connected to an external device, the bus bar holder positioned on the upper side is directly supported by a bearing holder (21) or a stator (40) that holds the bearing, and the bus bar holder positioned on the lower side is arranged with a gap from the bearing holder (21) or the stator (40).
Description
Technical Field
The invention relates to a bus bar unit, a motor, and an electric power steering apparatus.
Background
Conventionally, a bus bar having a terminal portion to be connected to an external device is known. For example, as disclosed in japanese patent No. 6053001 (patent document 1), there is a bus bar having a U-phase terminal, a V-phase terminal, and a W-phase terminal connected to an external wiring. The U-phase terminal, the V-phase terminal, and the W-phase terminal extend in the axial direction.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 6053001
Disclosure of Invention
Problems to be solved by the invention
In the bus bar having the U-phase terminal, the V-phase terminal, and the W-phase terminal connected to the external wiring, if the bus bar is arranged obliquely, the positions of the upper end portions of the terminals are largely displaced, and thus the connection to the external wiring is deteriorated.
The invention aims to provide a bus bar unit, a motor and an electric power steering device which improve the position accuracy of a terminal part of a bus bar.
Means for solving the problems
A bus bar unit according to an aspect of the present invention is used for a motor including: a rotor including a shaft extending in an axial direction; a stator disposed radially outside or inside the rotor; and a bearing rotatably supporting the shaft, wherein the bus bar unit includes: a plurality of bus bars; and two bus bar holders that hold the bus bars and are arranged at intervals in the axial direction, at least one of the bus bars held by the bus bar holder positioned on the upper side includes a terminal portion to be connected to an external device, the bus bar holder positioned on the upper side is directly supported by a bearing holder or a stator that holds a bearing, and the bus bar holder positioned on the lower side is arranged with a gap between the bearing holder or the stator.
Effects of the invention
According to one aspect of the present invention, a bus bar unit, a motor, and an electric power steering device that can improve the positional accuracy of a terminal portion of a bus bar can be provided.
Drawings
Fig. 1 is a sectional view of a motor in an embodiment.
Fig. 2 is a perspective view of a bearing holder according to the embodiment.
Fig. 3 is a perspective view of the bus bar unit and the stator in the embodiment.
Fig. 4 is a perspective view of the bus bar unit and the bearing holder in the embodiment.
Fig. 5 is a perspective view of a neutral point bus bar and a neutral point bus bar holder in the embodiment.
Fig. 6 is a perspective view of the bus bar unit and the bearing holder in the embodiment.
Fig. 7 is a perspective view of a phase bus bar and a phase bus bar holder in the embodiment.
Fig. 8 is a schematic diagram of an electric power steering apparatus according to an embodiment.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated.
In the following description, the direction in which the center axis a of the rotor 30 extends is simply referred to as "axial direction", the direction perpendicular to the center axis a is simply referred to as "radial direction", and the direction around the center axis a is simply referred to as "circumferential direction". The upper side of fig. 1 in the "axial direction" is simply referred to as "upper side" and the lower side is simply referred to as "lower side". The upper side of fig. 1 is a side to which an external device is connected. The vertical direction does not indicate a positional relationship and a direction when the device is mounted on an actual apparatus
A bus bar unit 100 and a motor 1 according to an embodiment of the present invention will be described with reference to fig. 1 to 7. As shown in fig. 1 to 3, the motor 1 mainly includes a housing 10, a bearing holder 21, bearings 22 and 23, a rotor 30, a stator 40, and a bus bar unit 100.
As shown in fig. 1, the case 10 has a bottomed cylindrical shape. That is, the housing 10 has a cylindrical portion 11 and a bottom portion 12. The upper portion of the housing 10 is open. The housing 10 internally houses the rotor 30 and the stator 40.
The bearing holder 21 is disposed axially above the stator 40. The bearing holder 21 is fixed to the housing 10 by shrink fitting or the like. The bearing holder 21 is made of metal, for example.
As shown in fig. 2, the bearing holder 21 has receiving portions 21a for supporting leg portions 121 of the phase bus bar holder 120 described later. The receiving portion 21a is provided on the upper surface of the bearing holder 21. The receiving portions 21a extend upward at intervals in the circumferential direction.
The receiving portion 21a has a recess 21b into which a leg portion 121 of the phase bus bar holder 120 described later is fitted. In the present embodiment, a recess 21b is provided in one receiving portion 21a of the three receiving portions 21 a. As shown in fig. 2, the recess 21b may be a through hole or may have a bottom.
As shown in fig. 1, the bearings 22 and 23 rotatably support a shaft 31 of the rotor 30. The bearing 22 disposed on the upper side in the axial direction is held by a bearing holder 21. The bearing 23 disposed axially downward is held by the bottom 12 of the housing 10.
The rotor core 32 is, for example, a laminated steel sheet in which a plurality of electromagnetic steel sheets are laminated in the axial direction. The rotor core 32 is fixed to a shaft 31 penetrating the center of the rotor core 32, and rotates together with the shaft 31. Magnet 33 is fixed to the outer surface of rotor core 32, and rotates together with rotor core 32 and shaft 31. Therefore, the rotor 30 in the present embodiment is an SPM (Surface Permanent Magnet) type. Rotor 30 may be an IPM (Interior Permanent Magnet) type in which Magnet 33 is embedded in rotor core 32.
The stator 40 surrounds the radially outer side of the rotor 30. As shown in fig. 1 and 3, the stator 40 includes a plurality of stator cores 41, a plurality of insulators 42, and a plurality of coils 43.
The stator core 41 is formed by laminating a plurality of electromagnetic steel plates in the axial direction. The stator cores 41 are arranged in a circumferential direction. The stator core 41 has a core back and teeth. The back of the iron core is cylindrical and concentric with the central axis A. The teeth extend radially inward from the inner surface of the core back. In the present embodiment, 12 teeth are provided.
An insulator 42 is mounted on each tooth. The insulator 42 covers at least a portion of the stator core 41. Specifically, the insulator 42 covers at least the upper end surface and the lower end surface of each tooth. The insulating material 42 has insulating properties, and is formed of an insulating material such as an insulating resin.
The coil 43 is formed by winding a coil wire around a tooth with an insulator 42 interposed therebetween. The coil 43 in the present embodiment is constituted by a plurality of coil groups in which two coils 43 are connected by one coil wire. Each coil group corresponds to any one of the U-phase, the V-phase, and the W-phase. The two lead wires, the 1 st lead wire 44 and the 2 nd lead wire 45, are drawn out from the coil assembly toward the upper side in the axial direction. The 1 st lead lines 44 and the 2 nd lead lines 45 are alternately arranged in the circumferential direction.
The bus bar unit 100 has 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 100 has a two-system power supply system.
Fig. 3 mainly shows the entirety of the motor 1 with the casing 10 omitted. Fig. 4 is a view mainly omitting the stator 40 in fig. 3. Fig. 5 is a view in which the stator 40, the phase bus bar holder 120, and the phase bus bar 140 are mainly omitted in fig. 3. As shown in fig. 3 to 5, the busbar unit 100 includes a neutral point busbar holder 110, a phase busbar holder 120, a neutral point busbar 130, and a phase busbar 140.
As shown in fig. 3 and 4, the neutral point busbar holder 110 and the phase busbar holder 120 are arranged at intervals in the axial direction. Thus, the bus bar holder holding one bus bar is arranged on the bus bar holder holding the other bus bar. Therefore, the dimension of the bus bar unit 100 in the axial direction can be suppressed.
Specifically, the phase busbar holder 120 is located on the axially upper side, and the neutral point busbar holder 110 is located on the axially lower side. That is, the bus bar held by the bus bar holder located on the upper side is the phase bus bar 140, and the bus bar held by the bus bar holder located on the lower side is the neutral point bus bar 130. Since the bus bar 140 for phase having the terminal portion 145 is located on the upper side in the axial direction, the accuracy of the terminal portion 145 can be improved.
The busbar unit 100 has two busbar holders. In the present embodiment, one neutral point bus bar holder 110, two neutral point bus bars 130, one phase bus bar holder 120, and six phase bus bars 140 are arranged in this order from the axially lower side.
The neutral point bus bar holder 110 is disposed axially above the stator 40. Specifically, the neutral point bus bar holder 110 is disposed with a gap from the bearing holder 21 positioned on the stator 40. That is, the neutral point bus bar holder 110 does not contact the bearing holder 21. The neutral point busbar holder 110 is fixed to the phase busbar holder 120 from below.
As shown in fig. 5, the neutral point bus bar holder 110 holds the neutral point bus bar 130. In detail, the neutral point bus bar holder 110 holds only the neutral point bus bar 130.
The neutral point bus bar holder 110 is provided with a groove 111 into which the neutral point bus bar 130 is fitted. The groove 111 is provided on the inner peripheral portion, but not on the outer peripheral portion.
The neutral point bus bar holder 110 has insulation properties, and is formed of an insulator such as an insulating resin, for example. The neutral point bus bar holder 110 holds the neutral point bus bars 130 in an electrically insulated state from each other. The neutral point bus bar holder 110 has an annular shape.
The neutral point bus bar holder 110 has a neutral point through hole 112 through which the coil wire passes in the axial direction. Specifically, the neutral point through hole 112 is penetrated by the 1 st lead wire 44 and the 2 nd lead wire 45. In the present embodiment, 12 neutral point through holes 112 are provided. The neutral point through holes 112 are the same size.
The neutral point bus bar holder 110 is provided with a hollow portion 113. The hollow portion 113 passes through a leg portion 121 (see fig. 3, 4, and 6) of a phase bus bar 140 described later. The hollow portion 113 is provided at the outer peripheral portion. In the present embodiment, the hollow portion 113 is three notches spaced apart in the circumferential direction. The hollow portion 113 is an opening extending in the axial direction, and may be a through hole or the like.
The neutral point bus bar 130 is held on the neutral point bus bar holder 110. Specifically, the plurality of neutral point bus bars 130 are held on the upper surface of the neutral point bus bar holder 110. The neutral point bus bar 130 is formed of a plate-shaped member having conductivity.
The neutral point bus bar 130 is electrically connected to the coil 43. Specifically, the neutral point bus bar 130 is electrically connected to the six 1 st lead wires 44 led out from each coil group, that is, the ends of the 1 st lead wires 44 of the U-phase, V-phase, and W-phase, by welding or the like. Thus, the neutral point bus bar 130 forms an electric neutral point by connecting one coil group.
The neutral point bus bar 130 of the present embodiment connects one system by star connection. Therefore, the neutral point bus bar 130 is constituted by two bus bars of the 1 st bus bar 130A and the 2 nd bus bar 130B.
The 1 st bus bar 130A includes an inner arc portion 131, an outer extension portion 132, a circumferential extension portion 133, and a connecting portion 134. The inner arc portion 131 is located radially inward of the 1 st lead wire 44 as the coil wire penetrating the neutral point through hole 112. The outer extension 132 extends radially outward from the inner arc 131. In fig. 5, the outer extending portions 132 extend radially outward from three positions, i.e., both end portions and a central portion of the inner arc portion 131. The circumferential extending portion 133 extends from the outer extending portion 132 toward the circumferential side of the 1 st lead wire 44. The circumferential extension 133 is provided in three. The connecting portion 134 extends upward from the circumferential extension 133. The connection portion 134 is connected to the 1 st lead wire 44. The connecting portion 134 is located radially outward of the inner arc-shaped portion 131.
The 2 nd bus bar 130B includes an outer arc portion 135, an inner extension portion 136, a circumferential extension portion 137, and a connecting portion 138. The outer arc-shaped portion 135 is located radially outward of the 1 st lead wire 44 as the coil wire penetrating the neutral point through hole 112. The inner extension 136 extends radially inward from the outer arc 135. In fig. 5, the inner extending portion 136 extends radially inward from three portions, i.e., both end portions and a central portion of the outer arc-shaped portion 135. The circumferential extension 137 extends from the inner extension 136 toward one circumferential side of the 1 st lead wire 44. The circumferential extension 137 is provided in three. The connecting portion 138 extends upward from the circumferential extension 137. The connecting portion 138 is located radially inward of the outer arc-shaped portion 135.
In this way, the 1 st bus bar 130A including the inner arc-shaped portion 131 and the 2 nd bus bar 130B including the outer arc-shaped portion 135 are held on one surface of the neutral point bus bar holder 110. That is, as a plurality of neutral point bus bars held on the same surface of the neutral point bus bar holder 110, there are a 1 st bus bar 130A including the inner arc-shaped portion 131 and a 2 nd bus bar 130B including the outer arc-shaped portion 135. According to this configuration, the 1 st and 2 nd bus bars 130A and 130B can be arranged on one surface of the neutral point bus bar holder 110 on the radially inner and outer sides of the coil wire, respectively. That is, the 1 st and 2 nd bus bars 130A and 130B can be arranged without being stacked. Therefore, the dimension of the bus bar unit 100 in the axial direction can be suppressed.
The connection portion 134 of the 1 st bus bar 130A and the connection portion 138 of the 2 nd bus bar 130B are provided in three. The three connecting portions 134, 138 are arranged at intervals of 120 degrees in the circumferential direction. That is, the connection portions 134 and 138 of the neutral point bus bars 130 of the respective systems are arranged at equal intervals of 120 degrees. With this arrangement, the dimension in the axial direction of the neutral point bus bar holder 110 having the plurality of neutral point bus bars 130 of the system can be further suppressed.
The connection portions 134 of the 1 st bus bar 130A and the connection portions 138 of the 2 nd bus bar 130B are alternately arranged in the circumferential direction. The respective connecting portions 134, 138 are arranged at 60-degree intervals in the circumferential direction.
The circumferential extending portions 133, 137 connected to the connecting portions 134, 138 are all located on the same side in the circumferential direction with respect to the 1 st outgoing line 44. That is, rising portions extending upward in the respective connecting portions 134 and 138 are in the same direction in the circumferential direction.
The connection portions 134 and 138 of the 1 st and 2 nd bus bars 130A and 130B have coil wire holding portions 139 at upper end portions, and the coil wire holding portions 139 have a substantially U-shape in plan view. The opening of the coil wire holding portion 139 faces radially outward.
Since the portions of the neutral point bus bar 130 extending in the circumferential direction and the radial direction are embedded in the groove portions 111 of the neutral point bus bar holder 110, they are located on the same plane as the upper surface of the neutral point bus bar holder 110. The portion of the neutral point bus bar 130 extending upward in the axial direction protrudes upward from the upper surface of the neutral point bus bar holder 110. Specifically, the inner arc-shaped portion 131, the outer extension portion 132, and the circumferential extension portion 133 of the 1 st bus bar 130A and the outer arc-shaped portion 135, the inner extension portion 136, and the circumferential extension portion 137 of the 2 nd bus bar 130B are fitted into the groove portion 111. The connection portion 134 of the 1 st bus bar 130A and the connection portion 138 of the 2 nd bus bar 130B extend upward from the upper surface of the neutral point bus bar holder 110.
The neutral point bus bar 130 has a through hole 130a through which a welding pin 151 for connecting to the neutral point bus bar holder 110 passes. A welding pin 151 described later passes through the through hole 130 a.
The phase busbar holder 120 is disposed axially above the neutral point busbar 130. As shown in fig. 3 and 4, the phase busbar holder 120 is directly supported by the bearing holder 21. Specifically, the lower neutral point bus bar holder 110 and the bearing holder 21 are arranged with a gap therebetween, and the upper phase bus bar holder 120 is directly supported by the bearing holder 21 arranged with a gap therebetween with respect to the neutral point bus bar holder 110. Therefore, the positional accuracy of the phase bus bar holder 120 located on the upper side can be improved. The bus bar holder 120 for phase positioned on the upper side holds a bus bar including a terminal portion 145 connected to an external device. Therefore, the positional accuracy of the terminal portion 145 of the bus bar can be improved.
The term "directly supported" means supported without via another member, and includes a case where the members are in contact with each other and a case where the members are supported via an adhesive member or the like.
Fig. 6 is a perspective view of fig. 4 from below in a state where the bus bar unit 100 is lifted upward from the bearing holder 21. As shown in fig. 3, 4, and 6, the phase busbar holder 120 includes a leg portion 121 extending axially downward toward the bearing holder 21. The leg 121 is directly supported by the receiving portion 21a (see fig. 2) of the bearing holder 21. The leg 121 can easily realize a structure in which the phase busbar holder 120 located on the upper side is directly supported by the bearing holder 21.
The leg 121 is provided on the outer periphery. Specifically, the leg portions 121 extend downward from the outer peripheral portion of the phase busbar holder 120 located on the upper side at intervals in the circumferential direction. In the present embodiment, the three leg portions 121 extend downward at intervals in the circumferential direction. The used bus bar holder 120 is positioned on the bearing holder 21 by the leg 121.
As shown in fig. 6, the leg 121 has a protrusion 121 a. The protrusion 121a is provided on the lower surface of the leg 121. The protrusion 121a is fitted into the recess 21b of the bearing holder 21 shown in fig. 2. By fitting the recess 21b of the bearing holder 21 to the projection 121a of the leg 121, the alignment of the phase bus bar holder 120 and the bearing holder 21 can be easily performed. The protrusion 121a is provided on at least one leg 121 of the plurality of legs 121. In the present embodiment, the protrusion 121a is provided on one leg 121 of the three legs 121.
As shown in fig. 7, the phase bus bar holder 120 holds a phase bus bar 140. Specifically, the phase busbar holder 120 holds only the phase busbar 140.
The phase bus bar holder 120 has insulation properties, and is formed of an insulator such as an insulating resin. The phase bus bar holders 120 hold the phase bus bars 140 in an electrically insulated state from each other. The phase bus bar holder 120 is annular.
The phase bus bar 140 is disposed on the inner periphery of the phase bus bar holder 120, and the phase bus bar 140 is not disposed on the outer periphery. As shown in fig. 7, the phase bus bar holder 120 has a wall portion 122. The wall portion 122 is provided at the outer peripheral portion. The wall portion 122 has a higher axial height than the inner peripheral portion. The wall portion 122 can increase the rigidity of the phase bus bar holder 120.
The phase bus bar holder 120 has a phase through hole 123 through which the coil wire passes in the axial direction. Specifically, the 1 st lead wire 44 and the 2 nd lead wire 45 pass through the phase through hole 123. The phase through hole 123 and the neutral point through hole 112 overlap in the axial direction. That is, the coil wire passing through the neutral point through hole 112 passes through the phase through hole 123 located immediately above the coil wire. The phase through hole 123 is larger than the neutral point through hole 112 so that the coil wire holding portion 139 provided at the upper end portion of the 1 st lead wire 44 can easily pass therethrough. Specifically, the phase through-holes 123 are arranged alternately in the circumferential direction with holes having the same size as the neutral point through-holes 112 and holes larger than the neutral point through-holes 112. The 1 st lead wire 44 passes through the relatively large phase through hole 123. The 2 nd lead wire 45 passes through the relatively small phase through hole 123.
The phase bus bar 140 is held by the phase bus bar holder 120. Specifically, the plurality of phase bus bars 140 are held on the upper surface of the phase bus bar holder 120. The plurality of phase bus bars 140 are disposed point-symmetrically about the central axis a. The phase bus bar 140 is formed of a plate-like member having conductivity.
The phase bus bar 140 is electrically connected to the coil 43. Specifically, the phase bus bar 140 is electrically connected to the six 2 nd lead wires 45 drawn from each coil group, that is, the ends of the U-phase, V-phase, and W-phase 2 nd lead wires 45 by soldering or the like. In the present embodiment, two phase busbars 140U, 140V, and 140W corresponding to the U-phase, the V-phase, and the W are provided.
The plurality of phase bus bars 140 do not overlap when viewed from the axially upper side. That is, the plurality of phase bus bars 140 are arranged so as not to cross each other. This can improve the accuracy of the plurality of phase bus bars 140 avoiding the bridge structure, and can suppress the dimension in the axial direction.
From a structural point of view, the plurality of phase bus bars 140 includes a 1 st bus bar and a 2 nd bus bar. In fig. 7, phase bus bar 140V is the 1 st bus bar, and phase bus bars 140U, 140W are the 2 nd bus bars.
The bus bar 140V for phase 1 includes an inner arc portion 141, a radially extending portion 142, a circumferentially extending portion 143, a connecting portion 144, and a terminal portion 145. The inner arc-shaped portion 141 is located radially inward of the 2 nd lead wire 45 as the coil wire penetrating the phase through-hole 123. The radially extending portions 142 extend radially outward from both ends of the inner arc-shaped portion 141. The two radially extending portions 142 extend from the inner arc-shaped portion 141 toward opposite sides to each other. The circumferential extension 143 is connected to one of the radial extensions 142 and extends toward one circumferential side of the 2 nd lead wire 45. The connection portion 144 is connected to the circumferentially extending portion 143 and to the 2 nd lead wire 45. The terminal portion 145 is connected to the other radial extending portion 142 and is connected to an external device. In fig. 7, the terminal portion 145 is connected to a circumferentially extending portion 143 extending circumferentially from the radially extending portion 142.
The bus bars 140U and 140W for phase 2 include an outer arc portion 146, a radially extending portion 147, a circumferentially extending portion 148, a connecting portion 144, and a terminal portion 145. The outer arc portion 146 is located radially outward of the 2 nd lead wire 45 as the coil wire penetrating the phase through hole 123. The radially extending portion 147 extends radially inward from one end of the outer arc portion 146. The circumferential extension 148 is connected to the radial extension 147 and extends toward one circumferential side of the 2 nd lead wire 45. The connection portion 144 is connected to the circumferential extension portion 148 and to the 2 nd lead wire 45. Terminal portion 145 is connected to the other end of outer arc portion 146 and extends upward. In fig. 7, the terminal portion 145 is connected to a circumferentially extending portion 148 extending from the outer arc portion 146 in the circumferential direction.
The terminal portion 145 is connected to an external device. As long as the terminal portion 145 includes a portion extending in the axial direction, it may be configured only by a straight portion as shown in fig. 7, or may include a portion extending in a direction intersecting the axial direction. In the present embodiment, each terminal portion 145 extends in the axial direction so as to be perpendicular to the direction in which the inner arc-shaped portion 141 and the outer arc-shaped portion 146 extend. That is, each terminal portion 145 is perpendicular to the upper surface of the mating bus bar holder 120.
The terminal portion 145 overlaps the neutral point bus bar 130 in the axial direction. Specifically, the terminal portion 145 is located directly above the 2 nd bus bar 130B.
The number of terminal portions 145 in the present embodiment is six. Three terminal portions arranged in the circumferential direction are defined as one set, and the two sets of terminal portions are opposed to each other.
The connecting portion 144 of the 1 st and 2 nd bus bars has a coil wire holding portion 149 having a substantially U-shape in a plan view at an upper end portion. The coil wire holding portion 149 has the same shape as the coil wire holding portion 139 of the neutral point bus bar 130.
The upward extending rising portions of the respective connecting portions 144 are in the same direction in the circumferential direction. In fig. 5 and 7, the connection portions 134, 138 of the neutral point bus bar 130 and the connection portion 144 of the common bus bar 140 stand from the same side in the circumferential direction.
The phase bus bar 140 has a through hole 140a through which a welding pin for connection to the phase bus bar holder 120 passes. The through hole 140a allows a welding pin 152 described later to pass therethrough.
The busbar unit 100 also has welding pins 151, 152 for fixing components. The welding pins 151, 152 extend in the axial direction.
As shown in fig. 5 and 7, the welding pin 151 fixes the neutral point bus bar 130, the neutral point bus bar holder 110, and the phase bus bar holder 120. This can reduce the number of components. In the present embodiment, the welding pin for fixing the neutral point bus bar 130 and the neutral point bus bar holder 110 without fixing the phase bus bar holder 120 is omitted, but such a welding pin may be provided.
The welding pin 152 shown in fig. 7 fixes the phase busbar holder 120 and the phase busbar 140 without fixing the neutral point busbar holder 110.
As shown in fig. 3, 4, and 6, the bus bar unit 100 further includes a terminal holding portion 160 that holds the terminal portion 145. The terminal holding portion 160 holds a set of terminal portions arranged in the circumferential direction. A gap is provided between the inner peripheral surface of terminal holding portion 160 and terminal portion 145. In fig. 7, the terminal holding portion 160 is omitted.
In the above-described embodiment, a structure in which the bus bar holder located on the upper side is directly supported by the bearing holder 21 and the bus bar holder located on the lower side is arranged with a gap from the bearing holder 21 has been described as an example. Thus, the busbar unit 100 is particularly suitable for a motor in which the busbar holder located on the upper side is directly supported on the bearing holder 21 fixed to the housing 10. However, in the present invention, the bus bar holder positioned on the upper side may be directly supported by the stator 40, and the bus bar holder positioned on the lower side may be disposed with a gap from the stator 40. In this case, it is preferable that the bus bar holder positioned on the upper side is directly supported by the stator 40 fixed to the housing 10. In this case, it is preferable that the bus bar holder positioned on the upper side includes a leg portion extending axially downward toward the stator 40.
In the embodiment, the description has been given taking as an example a structure in which the phase busbar holder 120 located on the upper side is directly supported by the bearing holder 21 via the leg portions 121. The bus bar holder positioned on the upper side may be directly supported by a support portion extending upward in the axial direction provided in the bearing holder 21 or the stator 40. That is, the support portion may be provided instead of the leg portion 121, or the leg portion 121 may be provided in the upper bus bar holder, and the support portion may be provided in the bearing holder 21 or the stator 40. Preferably, the support portion has a projection provided on the upper surface. In this case, the bus bar holder located on the upper side preferably has a recess into which the protrusion fits.
In the case where the support portion is provided in the bearing holder 21 or the stator 40 in this manner, the terminal portion 145 is positioned on the upper side in the axial direction of the support portion. Thus, since the terminal portion 145 is positioned above the support portion directly supporting the upper bearing holder, the positional accuracy of the terminal portion 145 can be further improved.
In the embodiment, a structure in which the phase bus bar holder 120 is disposed on the neutral point bus bar holder 110 has been described as an example. In the bus bar unit of the present invention, the neutral point bus bar holder 110 may be disposed on the phase bus bar holder 120.
In the embodiment, a structure in which the neutral point bus bar 130 is held on the upper surface of the neutral point bus bar holder 110 and the phase bus bar 140 is held on the upper surface of the phase bus bar holder 120 has been described as an example. The neutral point bus bar may be held on the lower surface of the neutral point bus bar holder 110, or the neutral point bus bar 130 may be held on the upper surface and the lower surface of the neutral point bus bar holder 110. The phase bus bar 140 may be held on the lower surface of the phase holder 120, or the phase bus bar 140 may be held on the upper surface and the lower surface of the phase bus bar holder 120.
In the embodiment, a description has been given of an example in which the bus bar unit has a bus bar holder that holds only the neutral point bus bar and a bus bar holder that holds only the phase bus bar. At least one of the two bus bar holders arranged at an interval in the axial direction may hold both the common bus bar and the neutral point bus bar.
In the embodiment, the wall portion 122 is provided on the phase bus bar holder 120 located on the upper side. The wall portion 122 may be omitted, may be provided on the lower bus bar holder, or may be provided on both bus bar holders.
In the embodiment, the neutral point bus bar 130 and the phase bus bar 140 include inner arc portions 131 and 141 and outer arc portions 135 and 146, respectively. The inner arc portions 131 and 141 and the outer arc portions 135 and 146 may cover a part of the neutral point through hole 112 and the phase through hole 123, or may not overlap the neutral point through hole 112 and the phase through hole 123 in the axial direction.
In the embodiment, the inner rotor type motor 1 is explained. The motor of the present invention is not limited to the inner rotor type, and may be an outer rotor type in which a rotor is disposed outside a stator.
In the embodiment, the motor 1 having the bearing holder 21 is explained. The motor of the present invention is not limited to a motor having a bearing holder.
An embodiment of the apparatus including the motor 1 will be described with reference to fig. 8. In the present embodiment, an example in which the motor 1 is mounted on the electric power steering apparatus will be described.
The electric power steering apparatus 2 is mounted on a steering mechanism of a wheel of an automobile. The electric power steering apparatus 2 is an apparatus for reducing a steering force by hydraulic pressure. As shown in fig. 8, the electric power steering apparatus 2 of the present embodiment includes a motor 1, a steering shaft 214, an oil pump 216, and a control valve 217.
The steering shaft 214 transmits an input from the steering member 211 to an axle 213 having wheels 212. The oil pump 216 generates hydraulic pressure in a cylinder 215 that transmits driving force based on the hydraulic pressure to the axle 213. The control valve 217 controls oil of the oil pump 216. In the electric power steering apparatus 2, the motor 1 is mounted as a drive source of the oil pump 216.
The electric power steering apparatus 2 includes a motor 1 including a bus bar unit 100 of the present embodiment. Therefore, the electric power steering device 2 that achieves the same effect as the motor 1 can be obtained. That is, since the motor 1 including the bus bar unit 100 is provided, the electric power steering apparatus 2 capable of improving the positional accuracy of the terminal portion 145 of the bus bar can be realized.
Here, the electric power steering apparatus 2 is described as an example of a method of using the motor 1 according to the embodiment, but the method of using the motor 1 is not limited, and can be widely used for a pump, a compressor, and the like.
The embodiments disclosed herein are considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims rather than the embodiments described above, and includes meanings equivalent to those of the claims and all modifications within the scope.
Description of the reference symbols
1: a motor; 2: an electric power steering apparatus; 10: a housing; 11: a cylindrical portion; 12: a bottom; 21: a bearing retainer; 21 a: a receiving part; 21 b: a recess; 22. 23: a bearing; 30: a rotor; 31: a shaft; 32: a rotor core; 33: a magnet; 40: a stator; 41: a stator core; 42: an insulating member; 43: a coil; 44: a 1 st outgoing line; 42: a 2 nd outlet line; 100: a bus bar unit; 110: a neutral point bus bar holder; 111: a groove part; 112: a neutral point through hole; 113: a hollow portion; 120: a phase bus bar holder; 121: a foot portion; 121 a: a protrusion portion; 122: a wall portion; 123: a through hole for phase; 130: a neutral point bus bar; 130A: 1 st bus bar; 130B: a 2 nd bus bar; 130a, 140 a: a through hole; 131. 141: an inner arc-shaped part; 132. 146: an outboard extension; 133. 137: a circumferential extension; 134. 138, 144: a connecting portion; 135: an outer arc-shaped part; 136: an inboard extension; 139. 149: a coil wire holding section; 140. 140U, 140V, 140W: a phase bus bar; 142. 147: a radial extension; 143. 148: a circumferential extension; 145: a terminal portion; 151. 152: a weld pin; 160: a terminal holding portion; 211: a steering member; 212. 213: a wheel; 213: an axle; 214: a steering shaft; 215: a power cylinder; 216: an oil pump; 217: a control valve; a: a central axis.
Claims (15)
1. A bus bar unit for a motor,
the motor has:
a rotor including a shaft extending in an axial direction;
a stator disposed radially outside or inside the rotor; and
a bearing rotatably supporting the shaft,
wherein the content of the first and second substances,
the bus bar unit has:
a plurality of bus bars; and
two bus bar holders which hold the bus bars and are arranged at intervals in the axial direction,
at least one of the bus bars held by the bus bar holder positioned on the upper side includes a terminal portion to be connected to an external device,
the bus bar holder located on the upper side is directly supported on the bearing holder holding the bearing or the stator,
the bus bar holder located on the lower side is disposed with a gap between the bearing holder and the stator.
2. The bus bar unit according to claim 1,
the busbar holder located on the upper side is directly supported on the bearing holder, which is fixed to the housing.
3. The bus bar unit according to claim 1,
the busbar holder on the upper side is directly supported on the stator, which is fixed to the housing.
4. The bus bar unit according to any one of claims 1 to 3,
the bus bar held by the bus bar holder located on the upper side is a phase bus bar, and the bus bar held by the bus bar holder located on the lower side is a neutral point bus bar.
5. The bus bar unit according to any one of claims 1 to 4,
the bus bar holder located on the upper side includes a leg portion extending toward the bearing holder or the stator toward the axially lower side.
6. The bus bar unit according to claim 5,
the leg has a protrusion provided on a lower surface.
7. The bus bar unit according to claim 5 or 6,
the terminal portion is located on an axially upper side of the leg portion.
8. The bus bar unit according to any one of claims 5 to 7,
the lower bus bar holder is provided with a hollow portion through which the leg portion passes.
9. The bus bar unit according to any one of claims 5 to 8,
the leg portions extend downward from an outer peripheral portion of the bus bar holder located on an upper side at intervals in a circumferential direction.
10. The bus bar unit according to any one of claims 1 to 9,
the bus bar holder located on the upper side is directly supported by a support portion provided on the bearing holder or the stator and extending toward the axial upper side.
11. The bus bar unit according to claim 10,
the support portion has a recess provided on an upper surface.
12. The bus bar unit according to claim 10 or 11,
the terminal portion is located on an axially upper side of the support portion.
13. The bus bar unit according to any one of claims 1 to 12,
the two busbar holders are fixed by welding pins extending in the axial direction.
14. A motor, comprising:
the bus bar unit according to any one of claims 1 to 13, which is arranged on an axially upper side of the stator;
the rotor;
the stator; and
the bearing is provided.
15. An electric power steering apparatus, wherein,
the electric power steering apparatus has the motor according to claim 14.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201862661707P | 2018-04-24 | 2018-04-24 | |
| US62/661,707 | 2018-04-24 | ||
| JP2018-161307 | 2018-08-30 | ||
| JP2018161307 | 2018-08-30 | ||
| PCT/JP2019/013653 WO2019208088A1 (en) | 2018-04-24 | 2019-03-28 | Busbar unit, motor, and electric power steering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112005468A true CN112005468A (en) | 2020-11-27 |
Family
ID=68293921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980026627.5A Withdrawn CN112005468A (en) | 2018-04-24 | 2019-03-28 | Bus bar unit, motor, and electric power steering device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112005468A (en) |
| WO (1) | WO2019208088A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011182512A (en) * | 2010-02-26 | 2011-09-15 | Nsk Ltd | Bus bar unit and rotary electric machine equipped therewith |
| CN104518596A (en) * | 2013-10-07 | 2015-04-15 | 三菱电机株式会社 | Rotary electric machine |
| CN106026476A (en) * | 2015-03-30 | 2016-10-12 | 日本电产株式会社 | Motor and in-vehicle apparatus |
| JP6053001B2 (en) * | 2013-03-08 | 2016-12-27 | Ｋｙｂ株式会社 | Bus bar unit |
-
2019
- 2019-03-28 WO PCT/JP2019/013653 patent/WO2019208088A1/en active Application Filing
- 2019-03-28 CN CN201980026627.5A patent/CN112005468A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011182512A (en) * | 2010-02-26 | 2011-09-15 | Nsk Ltd | Bus bar unit and rotary electric machine equipped therewith |
| JP6053001B2 (en) * | 2013-03-08 | 2016-12-27 | Ｋｙｂ株式会社 | Bus bar unit |
| CN104518596A (en) * | 2013-10-07 | 2015-04-15 | 三菱电机株式会社 | Rotary electric machine |
| CN106026476A (en) * | 2015-03-30 | 2016-10-12 | 日本电产株式会社 | Motor and in-vehicle apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019208088A1 (en) | 2019-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110546862B (en) | Bus bar unit and motor having the same | |
| JP5978357B2 (en) | Rotating electric machine | |
| US10063120B2 (en) | Motor and in-vehicle apparatus | |
| WO2018038246A1 (en) | Motor | |
| US9601958B2 (en) | Stator portion and motor | |
| US7795767B2 (en) | Motor with multiple bus rings | |
| US7723878B2 (en) | Motor for electric power steering and method for manufacturing the same | |
| US20160218578A1 (en) | Bus bar unit, method for manufacturing bus bar unit, and brushless motor | |
| CN110476327B (en) | Bus bar unit and motor | |
| CN110476328B (en) | Bus bar unit and motor | |
| CN108206598B (en) | Motor device and stator thereof | |
| JP2019170013A (en) | Motor and electric power steering device | |
| CN109792182B (en) | Motor | |
| JP7318654B2 (en) | motor | |
| CN110506381B (en) | Motor | |
| WO2009113520A1 (en) | Motor | |
| CN111989846A (en) | Bus bar unit, motor, and electric power steering device | |
| JP3902219B1 (en) | Centralized power distribution parts | |
| CN112020813A (en) | Bus bar unit, motor, and electric power steering device | |
| CN112005468A (en) | Bus bar unit, motor, and electric power steering device | |
| JP6390545B2 (en) | Electric motor | |
| WO2018020650A1 (en) | Stator and motor | |
| WO2019082410A1 (en) | Bus bar unit, motor, and electric power steering device | |
| CN109586479B (en) | Motor and electric power steering apparatus | |
| CN217063434U (en) | Terminal block for motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20201127 |
|
| WW01 | Invention patent application withdrawn after publication |