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WO2019208088A1 - Unité de barre omnibus, moteur et dispositif de direction assistée électrique - Google Patents

Unité de barre omnibus, moteur et dispositif de direction assistée électrique Download PDF

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Publication number
WO2019208088A1
WO2019208088A1 PCT/JP2019/013653 JP2019013653W WO2019208088A1 WO 2019208088 A1 WO2019208088 A1 WO 2019208088A1 JP 2019013653 W JP2019013653 W JP 2019013653W WO 2019208088 A1 WO2019208088 A1 WO 2019208088A1
Authority
WO
WIPO (PCT)
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.)
Ceased
Application number
PCT/JP2019/013653
Other languages
English (en)
Japanese (ja)
Inventor
修二 岩崎
卓寛 上谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Priority to CN201980026627.5A priority Critical patent/CN112005468A/zh
Publication of WO2019208088A1 publication Critical patent/WO2019208088A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to a bus bar unit, a motor, and an electric power steering device.
  • a bus bar having a terminal portion connected to an external device is known.
  • a bus bar including a U-phase terminal, a V-phase terminal, and a W-phase terminal connected to external wiring.
  • the U-phase terminal, the V-phase terminal, and the W-phase terminal extend in the axial direction.
  • An object of the present invention is to provide a bus bar unit, a motor, and an electric power steering device that improve the positional accuracy of the terminal portion of the bus bar.
  • bus bar unit of the present invention is used for a motor including a rotor including a shaft extending in the axial direction, a stator disposed on the radially outer side or the inner side of the rotor, and a bearing that rotatably supports the shaft.
  • a bus bar unit comprising: a plurality of bus bars; and two bus bar holders that hold the bus bars and are spaced apart from each other in the axial direction, and at least one of the bus bars held by the bus bar holder located on the upper side
  • One includes a terminal portion connected to an external device, and the upper bus bar holder is directly supported by a bearing holder or stator that holds the bearing, and the lower bus bar holder is spaced from the bearing holder or stator. Arranged through.
  • a bus bar unit a motor, and an electric power steering device that can improve the positional accuracy of the terminal portion of the bus bar.
  • FIG. 1 is a cross-sectional view of a motor in the embodiment.
  • FIG. 2 is a perspective view of the bearing holder in 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 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 the phase bus bar and the phase bus bar holder in the embodiment.
  • FIG. 8 is a schematic diagram of the electric power steering apparatus according to the embodiment.
  • the direction in which the central axis A of the rotor 30 extends is simply referred to as “axial direction”, the direction orthogonal to the central axis A is simply referred to as “radial direction”, and the direction around the axis of the central axis A is referred to as “axial direction”. It is simply called “circumferential direction”. 1 in the “axial direction” is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”. The upper side of FIG. 1 is a side to which an external device is connected. Note that the vertical direction does not indicate the positional relationship and direction when incorporated in an actual device.
  • 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.
  • the housing 10 has a bottomed cylindrical shape. That is, the housing 10 has a cylindrical portion 11 and a bottom portion 12. The upper part of the housing 10 opens. The housing 10 accommodates the rotor 30 and the stator 40 therein.
  • the bearing holder 21 is disposed on the upper side of the stator 40 in the axial direction.
  • 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.
  • the bearing holder 21 has a receiving portion 21a that supports a foot portion 121 of a phase bus bar holder 120 described later.
  • the receiving portion 21 a is provided on the upper surface of the bearing holder 21.
  • the receiving portion 21a extends upward at an interval in the circumferential direction.
  • the receiving portion 21a has a concave portion 21b into which a foot portion 121 of a phase bus bar holder 120 described later is fitted.
  • a recess 21b is provided in one of the three receiving portions 21a.
  • the recess 21b may be a through hole as shown in FIG. 2 or may have a bottom.
  • the bearings 22 and 23 rotatably support the shaft 31 of the rotor 30.
  • the bearing 22 disposed on the upper side in the axial direction is held by the bearing holder 21.
  • the bearing 23 disposed on the lower side in the axial direction is held on the bottom 12 of the housing 10.
  • the rotor 30 includes a shaft 31, a rotor core 32, and a magnet 33.
  • the shaft 31 extends in the axial direction along the central axis A.
  • the shaft 31 is supported by the pair of bearings 22 and 23 and rotates around the central axis A.
  • the rotor core 32 is a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the axial direction.
  • the rotor core 32 is fixed to a shaft 31 that passes through the center of the rotor core 32 and rotates together with the shaft 31.
  • the magnet 33 is fixed to the outer surface of the rotor core 32 and rotates together with the rotor core 32 and the shaft 31. Therefore, the rotor 30 in the present embodiment is a SPM (Surface Permanent Magnet) type.
  • the rotor 30 may be an IPM (Interior Permanent Magnet) type in which a magnet 33 is embedded in a rotor core 32.
  • the stator 40 surrounds the outer side of the rotor 30 in the radial direction. As shown in FIGS. 1 and 3, the stator 40 includes a plurality of divided stator cores 41, a plurality of insulators 42, and a plurality of coils 43.
  • the stator core 41 has a plurality of electromagnetic steel plates laminated in the axial direction.
  • the stator core 41 is arranged side by side in the circumferential direction.
  • Stator core 41 has a core back and teeth.
  • the core back has a cylindrical shape concentric with the central axis A.
  • the teeth extend radially inward from the inner side surface of the core back. In the present embodiment, 12 teeth are provided.
  • the insulator 42 is attached to each tooth.
  • the insulator 42 covers at least a part 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 insulator 42 has an insulating property, and is formed of an insulator such as an insulating resin.
  • the coil 43 is configured by winding a coil wire around a tooth via an insulator 42.
  • the coil 43 in the present embodiment is composed of a plurality of coil groups in which two coils 43 are connected by one coil wire. Each of the coil groups corresponds to any one of the U phase, the V phase, and the W phase. From the coil group, two lead lines, that is, a first lead line 44 and a second lead line 45 are drawn toward the upper side in the axial direction. The first lead lines 44 and the second lead lines 45 are alternately positioned in the circumferential direction.
  • the bus bar unit 100 has a plurality of power supply systems, with one set of U phase, V phase, and W phase. In the present embodiment, the bus bar unit 100 has two power supply systems.
  • FIG. 3 mainly shows the entire motor 1 from which the housing 10 is omitted.
  • FIG. 4 is a diagram in which the stator 40 is mainly omitted in FIG.
  • 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.
  • the bus bar unit 100 includes a neutral point bus bar holder 110, a phase bus bar holder 120, a neutral point bus bar 130, and a phase bus bar 140. *
  • the neutral point bus bar holder 110 and the phase bus bar holder 120 are arranged at an interval in the axial direction. Thereby, the bus bar holder holding the other bus bar is arranged on the bus bar holder holding one bus bar. For this reason, the dimension of the axial direction of the bus-bar unit 100 can be suppressed.
  • phase bus bar holder 120 is positioned on the upper side in the axial direction
  • the neutral point bus bar holder 110 is positioned on the lower side in the axial direction. That is, the bus bar held by the upper bus bar holder is the phase bus bar 140, and the bus bar held by the lower bus bar holder is the neutral point bus bar 130. Since the phase bus bar 140 having the terminal portion 145 is positioned on the upper side in the axial direction, the accuracy of the terminal portion 145 can be improved.
  • the bus bar unit 100 includes two bus bar holders.
  • 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 located sequentially from the lower side in the axial direction.
  • the neutral point bus bar holder 110 is disposed on the upper side of the stator 40 in the axial direction. More specifically, the neutral point bus bar holder 110 is arranged with a clearance from the bearing holder 21 located on the stator 40. That is, the neutral point bus bar holder 110 does not contact the bearing holder 21. The neutral point bus bar holder 110 is fixed to the phase bus bar holder 120 from below.
  • the neutral point bus bar holder 110 holds the neutral point bus bar 130. Specifically, 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 part 111 is provided in the inner peripheral part and is not provided in the outer peripheral part.
  • the neutral point bus bar holder 110 has an insulating property, and is formed of an insulator such as an insulating resin.
  • the neutral point bus bar holder 110 holds the neutral point bus bars 130 in an electrically insulated state.
  • 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 penetrates in the axial direction. Specifically, the neutral point through hole 112 allows the first lead line 44 and the second lead line 45 to pass therethrough. In this embodiment, twelve neutral point through holes 112 are provided. The neutral point through holes 112 have the same size.
  • the neutral point bus bar holder 110 is provided with a cavity 113.
  • the cavity 113 passes a foot 121 (see FIGS. 3, 4, and 6) of a phase bus bar 140 described later.
  • the cavity 113 is provided on the outer periphery.
  • the cavity part 113 is three notches spaced apart in the circumferential direction.
  • the cavity 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 by 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-like member having conductivity.
  • the neutral point bus bar 130 is electrically connected to the coil 43. Specifically, the neutral point bus bar 130 is welded to the end portions of the six first lead wires 44 drawn from each coil set, that is, the first lead wires 44 of the U phase, the V phase, and the W phase. Are electrically connected. As a result, the neutral point bus bar 130 connects one coil set to form an electrical neutral point.
  • the neutral point bus bar 130 of the present embodiment connects one system by star connection. For this reason, the neutral point bus bar 130 includes two bus bars, a first bus bar 130A and a second bus bar 130B.
  • the first bus bar 130A includes an inner arc-shaped portion 131, an outer extending portion 132, a circumferential extending portion 133, and a connecting portion 134.
  • the inner arcuate portion 131 is located on the radially inner side of the first lead wire 44 that is a coil wire that passes through the neutral point through hole 112.
  • the outer extending portion 132 extends from the inner arcuate portion 131 outward in the radial direction. In FIG. 5, the outer extending portion 132 extends radially outward from three locations, both end portions and the central portion of the inner arcuate portion 131.
  • the circumferential extending portion 133 extends from the outer extending portion 132 toward one circumferential direction side of the first lead wire 44.
  • the connecting part 134 extends upward from the circumferentially extending part 133.
  • the connection unit 134 is connected to the first lead wire 44.
  • the connection part 134 is located on the radially outer side of the inner arcuate part 131.
  • the second bus bar 130B includes an outer arcuate portion 135, an inner extension portion 136, a circumferential extension portion 137, and a connection portion 138.
  • the outer arcuate portion 135 is located on the radially outer side of the first lead wire 44 that is a coil wire that passes through the neutral point through hole 112.
  • the inner extension 136 extends from the outer arcuate part 135 radially inward. In FIG. 5, the inner extension 136 extends radially inward from the three ends of the outer arcuate part 135, that is, both ends and the center.
  • the circumferential extending portion 137 extends from the inner extending portion 136 toward one circumferential direction side of the first lead wire 44. Three circumferentially extending portions 137 are provided.
  • the connecting portion 138 extends upward from the circumferentially extending portion 137.
  • the connecting portion 138 is located on the radially inner side of the outer arcuate portion 135.
  • the first bus bar 130A including the inner arc-shaped portion 131 and the second 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, the first bus bar 130A including the inner arc-shaped portion 131 and the second bus bar 130B including the outer arc-shaped portion 135; Exists.
  • the first and second bus bars 130 ⁇ / b> A and 130 ⁇ / b> B can be arranged on the inner side and the outer side of the coil wire on one side of the neutral point bus bar holder 110. That is, the first and second bus bars 130A and 130B can be arranged without being stacked. For this reason, the dimension of the axial direction of the bus-bar unit 100 can be suppressed.
  • connection portions 134 of the first bus bar 130A and three connection portions 138 of the second bus bar 130B are provided.
  • the three connection portions 134 and 138 are arranged at intervals of 120 degrees in the circumferential direction. That is, the connecting portions 134 and 138 of the neutral point bus bars 130 of the respective systems are arranged at an equal distribution of 120 degrees. With this arrangement, it is possible to further suppress the axial dimension of the neutral point bus bar holder 110 including a plurality of neutral point bus bars 130.
  • connection part 134 of the first bus bar 130A and the connection part 138 of the second bus bar 130B are alternately positioned in the circumferential direction.
  • Each connection part 134 and 138 is arrange
  • All of the circumferentially extending portions 133 and 137 connected to the connecting portions 134 and 138 are located on the same side in the circumferential direction with respect to the first lead wire 44. That is, the upright portions extending upward in the respective connection portions 134 and 138 are in the same direction in the circumferential direction.
  • connection parts 134 and 138 of the first and second bus bars 130A and 130B have a substantially U-shaped coil wire holding part 139 at the upper end part in plan view.
  • the opening of the coil wire holding portion 139 faces radially outward.
  • the portion extending in the circumferential direction and the radial direction of the neutral point bus bar 130 is fitted in the groove portion 111 of the neutral point bus bar holder 110, and thus is 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 that extends upward in the axial direction protrudes above the upper surface of the neutral point bus bar holder 110.
  • the direction extending part 137 fits into the groove part 111.
  • the connection portion 134 of the first bus bar 130A and the connection portion 138 of the second 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 the welding pin 151 for connecting to the neutral point bus bar holder 110 is passed.
  • the through-hole 130a passes the welding pin 151 mentioned later.
  • the phase bus bar holder 120 is disposed on the axially upper side of the neutral point bus bar 130. As shown in FIGS. 3 and 4, the phase bus bar holder 120 is directly supported by the bearing holder 21. More specifically, the neutral point bus bar holder 110 located on the lower side is arranged with a clearance from the bearing holder 21, and the phase bus bar holder 120 located on the upper side is arranged with respect to the neutral point bus bar holder 110 via the gap. The bearing holder 21 is directly supported. For this reason, the positional accuracy of the bus bar holder 120 for phases located on the upper side can be improved. The phase bus bar holder 120 located on the upper side holds the bus bar including the terminal portion 145 connected to the external device. Therefore, the positional accuracy of the terminal part 145 of the bus bar can be improved.
  • directly supported means that it is supported without other parts, and includes a case where it is in contact and a case where it is supported via an adhesive member.
  • FIG. 6 is a perspective view when the state where the bus bar unit 100 is lifted upward from the bearing holder 21 in FIG. 4 is viewed from below.
  • the phase bus bar holder 120 includes a foot 121 that extends downward in the axial direction toward the bearing holder 21.
  • the foot 121 is directly supported by the receiving portion 21a (see FIG. 2) of the bearing holder 21.
  • the foot 121 can easily realize a structure in which the phase bus bar holder 120 located on the upper side is directly supported by the bearing holder 21.
  • the foot 121 is provided on the outer periphery. Specifically, the plurality of leg portions 121 extend downward from the outer peripheral portion of the corresponding bus bar holder 120 positioned on the upper side with a gap in the circumferential direction. In the present embodiment, the three leg portions 121 extend downward at intervals in the circumferential direction.
  • the leg bus bar holder 120 is positioned on the bearing holder 21 by the foot 121.
  • the foot 121 has a protrusion 121a.
  • the protrusion 121 a is provided on the lower surface of the foot 121.
  • the protrusion 121a fits into the recess 21b of the bearing holder 21 shown in FIG.
  • the protrusion 121a is provided on at least one of the plurality of legs 121.
  • a protrusion 121 a is provided on one of the three legs 121.
  • the phase bus bar holder 120 holds the phase bus bar 140. Specifically, the phase bus bar holder 120 holds only the phase bus bar 140.
  • the phase bus bar holder 120 has an insulating property, and is formed of an insulator such as an insulating resin.
  • the phase bus bar holder 120 holds the phase bus bars 140 in an electrically insulated state.
  • the phase bus bar holder 120 has an annular shape.
  • 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.
  • the phase bus bar holder 120 has a wall portion 122.
  • the wall part 122 is provided in an outer peripheral part.
  • the wall 122 has a higher axial height than the inner periphery.
  • 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 penetrates in the axial direction. Specifically, the phase through-hole 123 passes the first lead wire 44 and the second lead wire 45. 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. In order to easily pass the coil wire holding portion 139 provided at the upper end portion of the first lead wire 44, the phase through hole 123 is larger than the neutral point through hole 112.
  • phase through-hole 123 holes having the same size as the neutral point through-hole 112 and holes larger than the neutral point through-hole 112 are alternately positioned in the circumferential direction.
  • the relatively large phase through hole 123 passes the first lead wire 44.
  • the relatively small phase through hole 123 allows the second lead wire 45 to pass through.
  • 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 bus bars for phase 140 are arranged symmetrically with respect to the central axis A.
  • the phase bus bar 140 is composed of a conductive plate-like member.
  • the phase bus bar 140 is electrically connected to the coil 43. Specifically, the phase bus bar 140 is welded to the ends of the six second lead wires 45 drawn from each coil set, that is, the U-phase, V-phase, and W-phase second lead wires 45. Electrically connected. In the present embodiment, two phase bus bars 140U, 140V, and 140W corresponding to the U phase, the V phase, and the W phase are provided.
  • the plurality of phase bus bars 140 do not overlap when viewed from the upper side in the axial direction. That is, the plurality of phase bus bars 140 are arranged so as not to cross each other. As described above, the plurality of phase bus bars 140 that avoid the bridge structure can improve accuracy and suppress the dimension in the axial direction.
  • the plurality of bus bars for phase 140 include a first bus bar and a second bus bar from the viewpoint of structure.
  • the phase bus bar 140V is the first bus bar
  • the phase bus bars 140U and 140W are the second bus bars.
  • the phase bus bar 140V which is the first bus bar, includes an inner arcuate portion 141, a radially extending portion 142, a circumferential extending portion 143, a connecting portion 144, and a terminal portion 145.
  • the inner arcuate portion 141 is located on the radially inner side of the second lead wire 45 that is a coil wire that penetrates the phase through hole 123.
  • the radially extending portion 142 extends radially outward from both ends of the inner arcuate portion 141.
  • the two radially extending portions 142 extend from the inner arcuate portion 141 to opposite sides.
  • the circumferential extension portion 143 is connected to one radial extension portion 142 and extends toward one circumferential direction side of the second lead wire 45.
  • connection portion 144 is connected to the circumferential extension portion 143 and is connected to the second lead wire 45.
  • the terminal portion 145 is connected to the other radially extending portion 142 and is connected to an external device. In FIG. 7, the terminal portion 145 is continuous with the circumferentially extending portion 143 extending in the circumferential direction from the radially extending portion 142.
  • Phase bus bars 140U and 140W which are second bus bars, include an outer arcuate portion 146, a radial extending portion 147, a circumferential extending portion 148, a connecting portion 144, and a terminal portion 145.
  • the outer arcuate portion 146 is located on the radially outer side of the second lead wire 45 that is a coil wire that penetrates the phase through hole 123.
  • the radially extending portion 147 extends radially inward from one end portion of the outer arcuate portion 146.
  • the circumferentially extending portion 148 is connected to the radially extending portion 147 and extends toward one circumferential direction of the second lead wire 45.
  • the connecting portion 144 is connected to the circumferentially extending portion 148 and is connected to the second lead wire 45.
  • the terminal portion 145 is connected to the other end of the outer arcuate portion 146 and extends upward. In FIG. 7, the terminal portion 145 is continuous with a circumferentially extending portion 148 that extends from the outer arcuate portion 146 in the circumferential direction.
  • the terminal unit 145 is connected to an external device. As long as the terminal portion 145 includes a portion extending in the axial direction, the terminal portion 145 may include only a straight portion as illustrated in FIG. 7, and may further 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 extending direction of the inner arc-shaped portion 141 and the outer arc-shaped portion 146. That is, each terminal portion 145 is orthogonal to the upper surface of the phase 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 immediately above the second bus bar 130B.
  • the terminal part 145 is located on the upper side in the axial direction of the foot part 121. Since the terminal part 145 is located above the foot part 121 directly supported by the bearing holder 21 in the phase bus bar holder 120, the positional accuracy of the terminal part 145 can be further improved.
  • terminal portions 145 there are six terminal portions 145 in the present embodiment.
  • the three terminal portions arranged in the circumferential direction constitute one set, and two sets of terminal portions face each other.
  • connection portion 144 of the first and second bus bars has a substantially U-shaped coil wire holding portion 149 at the upper end portion in plan view.
  • Coil wire holding portion 149 has the same shape as coil wire holding portion 139 of neutral point bus bar 130.
  • connection portion 144 The standing portion extending upward in each connection portion 144 is in the same direction in the circumferential direction. 5 and 7, the connection portions 134 and 138 of the neutral point bus bar 130 and the connection portion 144 of the phase bus bar 140 stand up from the same side in the circumferential direction.
  • the phase bus bar 140 has a through hole 140a through which a welding pin for connecting to the phase bus bar holder 120 is passed.
  • the through-hole 140a passes the welding pin 152 mentioned later.
  • the bus bar unit 100 further includes welding pins 151 and 152 for fixing the members.
  • the welding pins 151 and 152 extend in the axial direction.
  • 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. Thereby, the number of parts can be reduced.
  • the welding pin that fixes 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 is provided. May be.
  • the bus bar unit 100 further includes a terminal holding unit 160 that holds the terminal unit 145 as shown in FIGS. 3, 4, and 6.
  • the terminal holding part 160 holds a set of terminal parts arranged in the circumferential direction. There is a gap between the inner peripheral surface of the terminal holding part 160 and the terminal part 145. In FIG. 7, the terminal holding unit 160 is omitted.
  • 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 described by taking as an example a structure in which the bus bar holder is disposed with a clearance from the bearing holder 21.
  • the bus bar unit 100 is particularly suitable for a motor in which the bus bar holder located on the upper side is directly supported by the bearing holder 21 fixed to the housing 10.
  • the bus bar holder located on the upper side may be directly supported by the stator 40, and the bus bar holder located on the lower side may be disposed with a gap from the stator 40.
  • the bus bar holder positioned on the upper side is preferably directly supported by the stator 40 fixed to the housing 10.
  • the bus bar holder located on the upper side includes a leg portion that extends downward in the axial direction toward the stator 40.
  • the structure in which the upper bus bar holder 120 positioned on the upper side is directly supported by the bearing holder 21 by the foot 121 has been described as an example.
  • the bus bar holder located on the upper side may be directly supported by a support portion provided on the bearing holder 21 or the stator 40 and extending upward in the axial direction. That is, a support portion may be provided instead of the foot portion 121, the foot 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.
  • the support portion preferably has a protrusion provided on the upper surface. In this case, it is preferable that the bus bar holder located on the upper side has a recess that fits into the protrusion.
  • the terminal portion 145 is located on the upper side in the axial direction of the support portion. Thereby, since the terminal part 145 is located above the support part which directly supports the upper bearing holder, the positional accuracy of the terminal part 145 can be further improved.
  • the structure in which the phase bus bar holder 120 is arranged on the neutral point bus bar holder 110 has been described as an example.
  • the neutral point bus bar holder 110 may be disposed on the phase bus bar holder 120.
  • 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 as an example.
  • the neutral point bus bar may be held on the lower surface of the neutral point bus bar holder 110, and the neutral point bus bar 130 may be held on the upper and lower surfaces of the neutral point bus bar holder 110.
  • the phase bus bar 140 may be held on the lower surface of the phase bus bar holder 120, and the phase bus bar 140 may be held on the upper and lower surfaces of the phase bus bar holder 120.
  • the bus bar unit has been described by taking as an example a structure including a bus bar holder that holds only the neutral point bus bar and a bus bar holder that holds only the bus bar for compatibility. At least one of the two bus bar holders spaced apart in the axial direction may hold both the phase bus bar and the neutral point bus bar.
  • the wall 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 bus bar holder located on the lower side, or may be provided on both bus bar holders.
  • each of the neutral point bus bar 130 and the phase bus bar 140 includes inner arc-shaped portions 131 and 141 and outer arc-shaped portions 135 and 146.
  • the inner arc-shaped portions 131 and 141 and the outer arc-shaped portions 135 and 146 may cover a part of the neutral point through hole 112 and the phase through hole 123, and the neutral point through hole 112 and the phase through hole 123. And do not have to overlap in the axial direction.
  • the inner rotor type motor 1 has been described.
  • the motor of the present invention is not limited to the inner rotor type, and may be an outer rotor type in which the rotor is disposed outside the stator.
  • the motor 1 including the bearing holder 21 has been described.
  • the motor of the present invention is not limited to a motor provided with a bearing holder.
  • FIG. 8 an embodiment of an apparatus including the motor 1 described above will be described.
  • the motor 1 is mounted on an electric power steering device.
  • the electric power steering device 2 is mounted on a steering mechanism of a vehicle wheel.
  • the electric power steering device 2 is a device that reduces the steering force by hydraulic pressure.
  • 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 the input from the steering 211 to the axle 213 having the wheels 212.
  • the oil pump 216 generates hydraulic pressure in the power cylinder 215 that transmits the hydraulic driving force to the axle 213.
  • the control valve 217 controls the oil of the oil pump 216.
  • the motor 1 is mounted as a drive source for the oil pump 216.
  • the electric power steering device 2 includes a motor 1 including the bus bar unit 100 of the present embodiment. For this reason, the electric power steering apparatus 2 with the same effect as the motor 1 is obtained. That is, since the motor 1 including the bus bar unit 100 is provided, the electric power steering device 2 that can improve the positional accuracy of the terminal portion 145 of the bus bar can be realized.
  • the electric power steering apparatus 2 was mentioned here as an example of the usage method of the motor 1 of embodiment, the usage method of the motor 1 is not limited and can be used widely, such as a pump and a compressor.

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  • 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

La présente unité de barre omnibus (100) comprend une pluralité de barres omnibus et deux supports de barre omnibus qui maintiennent les barres omnibus et sont agencés à distance dans la direction axiale. Au moins une des barres omnibus maintenues par le support de barre omnibus positionné sur le côté supérieur comprend une unité de terminal (145) connectée à un dispositif externe. Le support de barre omnibus positionné sur le côté supérieur est directement supporté par un support de palier (21) portant des paliers ou par un stator (40). Le support de barre omnibus positionné sur le côté inférieur est agencé à distance du support de palier (21) ou du stator (40).
PCT/JP2019/013653 2018-04-24 2019-03-28 Unité de barre omnibus, moteur et dispositif de direction assistée électrique Ceased WO2019208088A1 (fr)

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US201862661707P 2018-04-24 2018-04-24
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CN115149751B (zh) * 2021-03-31 2026-01-16 日本电产株式会社 马达和电气产品

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011182512A (ja) * 2010-02-26 2011-09-15 Nsk Ltd バスバーユニット及びこれを備えた回転電機
JP5661161B1 (ja) * 2013-10-07 2015-01-28 三菱電機株式会社 回転電機
JP2016189687A (ja) * 2015-03-30 2016-11-04 日本電産株式会社 モータおよび車載装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6053001B2 (ja) * 2013-03-08 2016-12-27 Ｋｙｂ株式会社 バスバーユニット

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011182512A (ja) * 2010-02-26 2011-09-15 Nsk Ltd バスバーユニット及びこれを備えた回転電機
JP5661161B1 (ja) * 2013-10-07 2015-01-28 三菱電機株式会社 回転電機
JP2016189687A (ja) * 2015-03-30 2016-11-04 日本電産株式会社 モータおよび車載装置

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