WO2019065850A1 - Moteur et procédé de fabrication d'un moteur - Google Patents

Moteur et procédé de fabrication d'un moteur Download PDF

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Publication number
WO2019065850A1
WO2019065850A1 PCT/JP2018/035963 JP2018035963W WO2019065850A1 WO 2019065850 A1 WO2019065850 A1 WO 2019065850A1 JP 2018035963 W JP2018035963 W JP 2018035963W WO 2019065850 A1 WO2019065850 A1 WO 2019065850A1
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WO
WIPO (PCT)
Prior art keywords
bus bar
holder
pieces
laser welding
piece
Prior art date
Application number
PCT/JP2018/035963
Other languages
English (en)
Japanese (ja)
Inventor
俊輔 村上
Original Assignee
日本電産株式会社
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Filing date
Publication date
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Publication of WO2019065850A1 publication Critical patent/WO2019065850A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/04—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings, prior to mounting into machines
    • 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 motor and a method of manufacturing the motor.
  • the bus bar includes a curved bus bar main body and a connection terminal extending inward from the inner periphery of the bus bar main body.
  • the bus bar as described above is manufactured, for example, by punching a plate member.
  • the number of the bus bar which is punched out of one plate member tends to be small, and the yield of the bus bar may not be sufficiently improved.
  • An object of the present invention is to provide a motor provided with a bus bar capable of improving yield and a method of manufacturing such a motor.
  • One aspect of the motor of the present invention includes a rotor having a shaft disposed along a central axis, a stator having a plurality of coils, and radially facing the rotor via a gap, and an axis of the stator And a bus bar unit disposed on one side of the direction.
  • the bus bar unit has a plate-like bus bar electrically connected to the coil, and a bus bar holder for holding the bus bar.
  • the bus bar is a separate member, and includes a plurality of bus bar pieces partially embedded in the bus bar holder, and a laser welded portion bonding the bus bar pieces together. The laser welding portion is exposed to the outside of the bus bar holder.
  • a rotor having a shaft disposed along a central axis, a stator having a plurality of coils and facing the rotor via a gap in the radial direction
  • the bus bar unit includes a plate-like bus bar electrically connected to the coil and a bus bar holder for holding the bus bar, and the bus bars are mutually different.
  • a manufacturing method of a motor having a plurality of bus bar pieces as members wherein a holding body manufacturing process for manufacturing a holding body having a plurality of bus bar pieces and a bus bar holder in which a part of the plurality of bus bar pieces is embedded And a laser welding process, which is provided after the holding body manufacturing process and includes joining a plurality of bus bar pieces by laser welding.
  • the plurality of bus bar pieces have exposed portions exposed to the outside of the bus bar holder, and the exposed portions contact each other.
  • the contact portions between the exposed portions are irradiated with laser light to join the exposed portions.
  • a motor comprising a bus bar capable of improving yield, and a method of manufacturing such a motor.
  • FIG. 1 is a cross-sectional view showing the motor of the first embodiment.
  • FIG. 2 is a top view of the bus bar unit of the first embodiment.
  • FIG. 3 is a perspective view showing a part of the bus bar unit of the first embodiment.
  • FIG. 4 is a perspective view showing the bus bar of the first embodiment.
  • FIG. 5 is a cross-sectional view showing the method of joining the bus bar pieces of the first embodiment.
  • FIG. 6 is a view of a part of the bus bar in the first modified example of the first embodiment as viewed from the upper side.
  • FIG. 7 is a view of a part of the bus bar in the second modified example of the first embodiment as viewed from the upper side.
  • FIG. 8 is a top view of the bus bar of the second embodiment.
  • FIG. 9 is a top view of the bus bar of the third embodiment.
  • FIG. 10 is a perspective view showing the bus bar of the fourth embodiment.
  • the Z-axis direction appropriately shown in each drawing is a vertical direction with the positive side as the upper side and the negative side as the lower side.
  • a central axis J appropriately shown in each drawing is an imaginary line which is parallel to the Z-axis direction and extends in the vertical direction.
  • the axial direction of the central axis J that is, the direction parallel to the vertical direction
  • the radial direction centering on the central axis J is simply referred to as “radial direction”.
  • the circumferential direction centered on is simply referred to as "circumferential direction”.
  • the circumferential direction is appropriately indicated by an arrow ⁇ .
  • the positive side in the Z-axis direction in the axial direction is called “upper side”
  • the negative side in the Z-axis direction in the axial direction is called “lower side”.
  • the upper side corresponds to one side in the axial direction
  • the lower side corresponds to the other side in the axial direction.
  • the side which proceeds in the counterclockwise direction as viewed from the upper side to the lower side in the circumferential direction that is, the side which proceeds in the direction of the arrow ⁇
  • the side advancing clockwise as viewed from the upper side to the lower side in the circumferential direction that is, the side advancing in the direction opposite to the direction of the arrow ⁇ is referred to as “the other side in the circumferential direction”.
  • a motor 10 As shown in FIG. 1, a motor 10 according to this embodiment includes a housing 11, a rotor 20, bearings 51 and 52, a stator 30, a bearing holder 40, a bus bar unit 90, and control. And a device 80.
  • the housing 11 accommodates each part of the motor 10.
  • the housing 11 is cylindrical around the central axis J.
  • the housing 11 holds the bearing 51 at the bottom on the lower side.
  • the rotor 20 has a shaft 21, a rotor core 22, and a magnet 23.
  • the shaft 21 is disposed along the central axis J.
  • the shaft 21 is rotatably supported by bearings 51 and 52.
  • the rotor core 22 has an annular shape fixed to the outer peripheral surface of the shaft 21.
  • the magnet 23 is fixed to the outer peripheral surface of the rotor core 22.
  • the bearing 51 rotatably supports the shaft 21 on the lower side of the rotor core 22.
  • the bearing 52 rotatably supports the shaft 21 on the upper side of the rotor core 22.
  • the bearings 51 and 52 are ball bearings.
  • the stator 30 faces the rotor 20 in the radial direction via a gap.
  • the stator 30 surrounds the rotor 20 at the radially outer side of the rotor 20.
  • the stator 30 has a stator core 31, an insulator 34, and a plurality of coils 35.
  • the stator core 31 has a core back 32 and a plurality of teeth 33.
  • the plurality of coils 35 are respectively attached to the plurality of teeth 33 via the insulators 34.
  • the coil 35 is configured by winding a conducting wire around the teeth 33 through the insulator 34. From each coil 35, a coil leader 35a is drawn upward.
  • the coil lead-out wire 35 a is a conducting wire extending from the coil 35 and is an end of the conducting wire that constitutes the coil 35.
  • the bearing holder 40 is disposed on the upper side of the stator 30.
  • the bearing holder 40 is disposed below the bus bar unit 90.
  • the bearing holder 40 is a metal member made of metal.
  • the bearing holder 40 is annular.
  • the bearing holder 40 holds the bearing 52 inside.
  • the outer peripheral surface of the bearing holder 40 is fixed to the inner peripheral surface of the housing 11.
  • the bearing holder 40 has a through hole axially penetrating the bearing holder 40.
  • the coil leader 35 a is passed through the through hole of the bearing holder 40. Thereby, the coil lead-out wire 35 a extends above the bearing holder 40.
  • the bus bar unit 90 is disposed on the upper side of the stator 30. More specifically, the bus bar unit 90 is disposed on the upper side of the bearing holder 40.
  • the bus bar unit 90 has a bus bar holder 60 and a bus bar 70.
  • the bus bar holder 60 holds the bus bar 70. In the bus bar holder 60, a part of the bus bar 70 is embedded. The bus bar holder 60 is disposed on the upper surface of the bearing holder 40. The bus bar holder 60 is made of resin. As shown in FIG. 2, the bus bar holder 60 includes a bus bar holder main body 61, a central cylindrical portion 62, a plurality of first connection portions 63, a plurality of second connection portions 64, and a terminal support portion 66. .
  • the bus bar holder main body 61 has an annular shape centering on the central axis J.
  • the central cylindrical portion 62 is cylindrical with the central axis J as its center.
  • the central cylindrical portion 62 is disposed radially inward of the bus bar holder main body 61.
  • the outer shape of the central cylindrical portion 62 is a substantially regular hexagonal shape when viewed from the upper side. As shown in FIG. 1, the central cylindrical portion 62 protrudes on both sides in the axial direction from the bus bar holder main body 61.
  • the plurality of first connection portions 63 and the plurality of second connection portions 64 extend in the radial direction, and connect the bus bar holder main body 61 and the central cylindrical portion 62.
  • the plurality of first connecting portions 63 and the plurality of second connecting portions 64 are alternately arranged along the circumferential direction over the entire circumference. For example, three first connection portions 63 and three second connection portions 64 are provided.
  • the first connecting portion 63 has a first base portion 63a, a first arm portion 63b, and a second arm portion 63c.
  • the first base portion 63 a is connected to the outer peripheral surface of the central tubular portion 62.
  • the first arm 63 b and the second arm 63 c extend radially outward from the first base 63 a.
  • the radial direction in which the first arm 63 b extends and the radial direction in which the second arm 63 c extends are different from each other.
  • the first arm 63 b and the second arm 63 c are spaced apart in the circumferential direction.
  • the first arm 63 b is disposed on one side in the circumferential direction than the second arm 63 c.
  • the radial outer ends of the first arm 63 b and the second arm 63 c are connected to the inner peripheral surface of the bus bar holder main body 61.
  • the second connecting portion 64 has a second base 64 a, a first arm 64 b, and a second arm 64 c.
  • the second base 64 a is connected to the outer peripheral surface of the central tubular portion 62.
  • the first arm 64 b and the second arm 64 c extend radially outward from the second base 64 a.
  • the radial direction in which the first arm 64 b extends and the radial direction in which the second arm 64 c extends are different.
  • the first arm portion 64 b and the second arm portion 64 c are disposed at an interval in the circumferential direction.
  • the first arm 64 b is disposed on the other side in the circumferential direction than the second arm 64 c.
  • the radial outer ends of the first arm 64 b and the second arm 64 c are connected to the inner circumferential surface of the bus bar holder main body 61.
  • the first arm 63 b of the first connecting portion 63 and the first arm 64 b of the second connecting portion 64 are adjacent to each other in the circumferential direction.
  • the second arm 63 c of the first connecting portion 63 and the second arm 64 c of the second connecting portion 64 are adjacent to each other in the circumferential direction.
  • the pair of first arm portions 63 b and 64 b and the pair of second arm portions 63 c and 64 c are alternately arranged along the circumferential direction.
  • a total of twelve arms including the first arms 63b and 64b and the second arms 63c and 64c are arranged at substantially equal intervals along the circumferential direction.
  • a holder through hole 65 which penetrates the bus bar holder 60 in the axial direction is provided. That is, the bus bar holder 60 has a holder through hole 65. In the present embodiment, for example, twelve holder through holes 65 are provided.
  • the terminal support portion 66 protrudes upward from the bus bar holder main body 61.
  • the terminal support 66 is in the form of a rectangular parallelepiped.
  • a plurality of terminal support portions 66 are provided.
  • the plurality of terminal support portions 66 are arranged at equal intervals along the circumferential direction. In FIG. 2, for example, three terminal support portions 66 are provided.
  • the bus bar 70 has a plate shape.
  • the bus bar 70 has a plurality of bus bar pieces 70a and 70b which are separate members, and a laser welded portion 74 for joining the bus bar pieces 70a and 70b.
  • the bus bar piece 70a is disposed on one circumferential side of the bus bar piece 70b.
  • the bus bar piece 70 a has a main body portion 71 and a coil connection portion 73.
  • the bus bar piece 70 b has a main body portion 72 and a coil connection portion 73. That is, the bus bar 70 has a coil connection portion 73.
  • the bus-bar 70 further has two bus-bar pieces and the connection terminal 75 other than bus-bar pieces 70a and 70b. Similar to the bus bar pieces 70a and 70b, the other two bus bar pieces also have a main body portion and a coil connection portion 73, and are joined together by laser welding.
  • each of the bus bar pieces 70a and 70b has a plate shape whose plate surface is orthogonal to the axial direction. Therefore, the axial dimension of the bus bar 70 can be reduced, and the motor 10 can be easily miniaturized.
  • each of the three bus bars 70 is provided with one connection terminal 75 and four coil connection parts 73, respectively. That is, in the present embodiment, a total of three connection terminals 75 are provided, and a total of twelve coil connection portions 73 are provided.
  • the main body portion 71 and the main body portion 72 have an elongated plate shape extending along a plane orthogonal to the axial direction.
  • the plate surface of the main body 71 and the plate surface of the main body 72 are orthogonal to the axial direction.
  • a portion of main body portion 71 and a portion of main body portion 72 are embedded in bus bar holder 60. More specifically, a part of the main body 71 is embedded in, for example, the first arm 63 b. A part of the main body 72 is embedded in, for example, the first arm 64 b. Thereby, a part of bus bar piece 70 a and a part of bus bar piece 70 b are embedded in bus bar holder 60.
  • One end portion of the main body portion 71 is an exposed portion 71 a that protrudes to the other side in the circumferential direction from the first base portion 63 a and is exposed to the outside of the bus bar holder 60. That is, the bus bar piece 70a has the exposed portion 71a.
  • One end portion of the main body portion 72 is an exposed portion 72 a which protrudes from the second base portion 64 a in the circumferential direction to one side and is exposed to the outside of the bus bar holder 60. That is, the bus bar piece 70b has the exposed portion 72a.
  • "a certain part is exposed to the outside of the bus bar holder” includes that a certain part is visible when the bus bar unit is viewed along at least one direction.
  • the exposed portion 71 a and the exposed portion 72 a extend linearly in the direction orthogonal to the axial direction and the radial direction.
  • the exposed portion 71 a and the exposed portion 72 a extend along a straight line along one side of the outer shape of the central tubular portion 62.
  • the exposed portions 71a and 72a contact each other. More specifically, the tip of the exposed portion 71a contacts the tip of the exposed portion 72a.
  • the exposed portion 71 a and the exposed portion 72 a are joined by the laser welding portion 74.
  • the coil connection portion 73 has a plate shape whose plate surface is orthogonal to the axial direction.
  • the coil connection portion 73 is connected to the main body portions 71 and 72 in the bus bar pieces 70a and 70b.
  • the plurality of coil connection portions 73 provided on each bus bar 70 project from one of the first arm portions 63 b and 64 b and the second arm portions 63 c and 64 c in the circumferential direction to one side. 60 exposed outside.
  • the coil connection portion 73 is disposed in the holder through hole 65.
  • the plurality of coil connection portions 73 are arranged at equal intervals along the circumferential direction.
  • the coil connection portion 73 has a substantially U-shape opening in one circumferential side.
  • the coil connection portion 73 has a base portion 73 a and a pair of arm portions 73 b and 73 c.
  • the base portion 73 a is a portion connected to the main body portions 71 and 72.
  • the pair of arm portions 73b and 73c extend from the base portion 73a in the circumferential direction to one side.
  • the arm portion 73b and the arm portion 73c face each other in the radial direction via a gap.
  • the arms 73 b are wavelike when viewed in the axial direction.
  • the upper end of the coil leader 35 a is inserted inside the coil connection portion 73, that is, between the arm 73 b and the radial direction of the arm 73 c.
  • the tip end portions of the pair of arm portions 73b and 73c are crimped from both sides in the radial direction to sandwich the coil lead wire 35a from both sides in the radial direction.
  • the coil connection portion 73 grips the coil lead-out wire 35a.
  • the coil connection portion 73 and the coil lead wire 35a are fixed to each other, for example, by welding.
  • the coil connection portion 73 and the coil lead wire 35a are joined by laser welding.
  • the coil connection portion 73 is connected to the coil lead wire 35 a, and the bus bar 70 is electrically connected to the coil 35.
  • each of the coil connection portions 73 a pair of arm portions 73 b and 73 c extend from the base portion 73 a in the same circumferential direction.
  • each of the coil connection portions 73 opens on the same side in the circumferential direction.
  • the coil connection portion 73 is shown opened to one side in the circumferential direction, but as described above, the arm portions 73b and 73c are crimped to thereby form the tip portion of the arm portion 73b and the arm portion 73c. It may be in contact with the tip. In this case, the opening of the coil connection portion 73 is in a closed state.
  • the laser welded portion 74 is a portion formed by joining the exposed portion 71a and the exposed portion 72a by laser welding. As shown in FIG. 5, the laser welding is performed by irradiating the target portion with the laser beam LB from the laser welder LM. In the present embodiment, the worker irradiates the laser beam LB from the upper side to the contact portion 76 where the distal end portion of the exposed portion 71a and the distal end portion of the exposed portion 72a are in contact.
  • the operator moves the laser welder LM along the contact portion 76 between the exposed portion 71a and the exposed portion 72a to move the laser beam LB.
  • the worker moves the laser beam LB in the width direction of the coil connection portion 73.
  • the “width direction” is a direction orthogonal to both the extending direction of each portion and the thickness direction of each portion in each portion of the plate-like bus bar. That is, the width direction in each of the exposed portions 71a and 72a corresponds to, for example, the radial direction.
  • the laser welding portion 74 includes, for example, a portion of the exposed portion 71a melted by a laser and a portion of the exposed portion 72a.
  • the plurality of bus bar pieces 70 a and 70 b which are separate members are joined by the laser welding portion 74 to configure the bus bar 70. Therefore, the shape of each of the bus bar pieces 70a and 70b can be simplified more than the shape of the entire bus bar 70. Therefore, when the plate members are punched out to produce each of the bus bar pieces 70a and 70b, it is easy to increase the number of pieces taken from one plate member. This makes it easier to increase the number of bus bars 70 that can be produced from one plate member as compared to the case where the entire shape of the bus bar 70 is punched out of a plate member as a single member. Therefore, according to the present embodiment, the motor 10 provided with the bus bar 70 capable of improving the yield can be obtained.
  • each bus bar piece when bus bar pieces are welded by resistance welding, it is necessary to provide each bus bar piece with a portion which can be sandwiched by a pair of electrodes used for resistance welding.
  • a pair of electrodes used for resistance welding.
  • the bus bar piece since the bus bar piece needs to be bent, the time and effort for manufacturing the bus bar is increased.
  • the bus bar can be easily enlarged by the amount of bending, and the motor can be easily enlarged. In the above-described example, the bus bar is easily enlarged in the axial direction, and the motor is easily enlarged in the axial direction.
  • the laser welding portion 74 linearly extends in the radial direction.
  • the laser welding portion 74 is exposed to the outside of the bus bar holder 60. Therefore, after the bus bar pieces 70a and 70b are partially embedded and held in the bus bar holder 60, the exposed portion 71a and the exposed portion 72a can be welded and joined using laser welding. Therefore, when manufacturing motor 10, the freedom degree of the timing which joins bus-bar pieces 70a and 70b can be improved. In the present embodiment, after the bus bar pieces 70a and 70b are partially embedded and held in the bus bar holder 60, the bus bar pieces 70a and 70b are joined to each other.
  • the laser welds 74 are exposed on both sides in the axial direction of the bus bar holder 60.
  • “the laser welding portion is exposed to a certain side of the bus bar holder” includes that the laser welding portion is visible when the bus bar unit is viewed from the certain side. That is, in the present embodiment, for example, the laser welded portion 74 can be visually recognized both when the bus bar unit 90 is viewed from above and when the bus bar unit 90 is viewed from below.
  • the laser welding portion 74 overlaps the holder through hole 65 as viewed in the axial direction. Therefore, when the laser beam LB is irradiated from the upper side to the contact portion 76 between the exposed portions 71a and 72a, the laser beam LB is a holder even if the laser beam LB leaks to the lower side of the exposed portions 71a and 72a. The light enters into the through hole 65. Therefore, it can be suppressed that the laser beam LB is irradiated to the portion of the bus bar holder 60. In addition, it is possible to suppress that the heat applied from the laser beam LB to the exposed portions 71 a and 72 a is transmitted to the bus bar holder 60. By these, it can suppress that a part of bus bar holder 60 fuses by laser beam LB, and it can control that bus bar holder 60 is damaged.
  • the laser welding portion 74 overlaps with the bearing holder 40 as viewed in the axial direction.
  • the laser beam LB can be shielded by the metal bearing holder 40. . Therefore, it can suppress that laser beam LB is irradiated to stator 30 or rotor 20, and it can control that stator 30 or rotor 20 is damaged.
  • connection terminal 75 protrudes upward from the bus bar holder 60. More specifically, the connection terminal 75 protrudes upward from the terminal support 66. The lower portion of the connection terminal 75 is supported by the terminal support 66. The upper end of the connection terminal 75 is connected to the controller 80. As shown in FIG. 2, the connection terminals 75 of the three bus bars 70 are arranged at equal intervals along the circumferential direction.
  • control device 80 is disposed on the upper side of bus bar unit 90. Control device 80 is electrically connected to bus bar 70 via connection terminal 75. Controller 80 supplies power to coil 35 via bus bar 70. Control device 80 has a substrate or the like provided with an inverter circuit that controls the power supplied to coil 35.
  • the method of manufacturing the motor 10 of the present embodiment includes a holder manufacturing step, a holder setting step, a crimping step, and a laser welding step.
  • the holder manufacturing step is a step of manufacturing a holder having a plurality of bus bar pieces 70a and 70b and a bus bar holder 60 in which a portion of the plurality of bus bar pieces 70a and 70b is embedded.
  • the operator punches out the plate member by press processing to manufacture a plurality of bus bar pieces 70a and 70b.
  • the worker inserts the plurality of bus bar pieces 70a and 70b into the mold, and manufactures the bus bar holder 60 by insert molding in which the resin is poured into the mold. Thereby, a holder is produced.
  • the plurality of bus bar pieces 70a and 70b have exposed portions 71a and 72a exposed to the outside of the bus bar holder 60, and the exposed portions 71a and 72a contact each other.
  • the bus bar holder 60 may be manufactured by outsert molding.
  • the holder setting step is a step of setting the holder inside the housing 11.
  • the operator inserts the holder into the inside of the housing 11 and places the holder above the bearing holder 40.
  • the operator inserts the coil lead wire 35 a extending from the coil 35 to the upper side of the bearing holder 40 into the inside of the coil connection portion 73 disposed inside the holder through hole 65.
  • the crimping step is a step of crimping the pair of arm portions 73 b and 73 c of the coil connection portion 73.
  • the operator caulks the pair of arm portions 73 b and 73 c of the coil connection portion 73 in the radial direction, and causes the coil connection portion 73 to grip the coil lead wire 35 a.
  • the laser welding process is provided after the holding body manufacturing process.
  • the laser welding step is a step including joining the coil connection portion 73 and the coil lead wire 35a by laser welding, and joining the plurality of bus bar pieces 70a and 70b by laser welding.
  • the operator irradiates the laser beam LB from the upper side of the holder to join the coil connection portion 73 and the coil lead-out wire 35a by laser welding.
  • the worker irradiates the contact portions 76 of the exposed portions 71a and 72a of the bus bar pieces 70a and 70b with the laser light LB to join the exposed portions 71a and 72a.
  • the order in which the laser welding of the plurality of coil connection portions 73 and the coil lead wire 35a and the laser welding of the plurality of bus bar pieces 70a and 70b are performed is not particularly limited. After the laser welding of all the coil connection portions 73 and the coil lead wire 35a is completed, the laser welding of the bus bar pieces 70a and 70b may be started. The laser welding of the coil connection portion 73 and the coil lead-out wire 35a and the laser welding of the bus bar pieces 70a and 70b may be alternately performed once or a plurality of times. After laser welding of all the bus bar pieces 70a and 70b is completed, laser welding of the coil connection portion 73 and the coil lead wire 35a may be started.
  • the bus bar pieces 70a and 70b are joined to complete the bus bar 70, and the bus bar unit 90 is completed. Further, the bus bar 70 is electrically connected to the coil 35 by joining the coil connection portion 73 and the coil lead-out wire 35 a. Thus, the bus bar unit 90 is installed in the housing 11 in a state where the bus bar 70 is electrically connected to the coil 35.
  • the bus bar piece 70a since the laser welded portion 74 is exposed to the outside of the bus bar holder 60, the bus bar piece 70a, after the holding body having the bus bar holder 60 and the bus bar pieces 70a and 70b is disposed inside the housing 11. 70b laser welding can be performed.
  • joining the coil connection portion 73 and the coil lead wire 35a by laser welding and joining the bus bar pieces 70a and 70b by laser welding can be performed collectively in the same process. Therefore, compared with the case where the operation of laser welding the coil connection portion 73 and the coil lead wire 35a and the operation of laser welding the bus bar pieces 70a and 70b are performed at different timings, time and effort for manufacturing the motor 10 Can be reduced.
  • the exposed portion 171a has a convex portion 171b at its tip.
  • the convex portion 171 b protrudes toward the exposed portion 172 a from a portion on one side in the width direction of the tip end portion of the exposed portion 171 a.
  • the exposed portion 172a has a convex portion 172b at its tip.
  • the convex portion 172 b protrudes toward the exposed portion 171 a from a portion on the other side in the width direction of the tip end portion of the exposed portion 172 a.
  • the outer shape of the convex portion 171 b and the outer shape of the convex portion 172 b are rectangular when viewed in the thickness direction of the bus bar 170.
  • the convex portion 171 b and the convex portion 172 b mesh with each other.
  • the laser welding portion 174 extends in a broken line shape.
  • the exposed portion 271a has a convex portion 271b at its tip.
  • the convex portion 271b protrudes from the center in the width direction of the end portion of the exposed portion 271a toward the exposed portion 272a.
  • the outer shape of the convex portion 271 b is substantially circular when viewed along the thickness direction of the bus bar 270.
  • the exposed portion 272a has a recess 272b at its tip.
  • the concave portion 272b is recessed from the center in the width direction of the end portion of the exposed portion 272a to the opposite side to the exposed portion 271a.
  • the inner edge of the recess 272b is substantially circular when viewed along the thickness direction of the bus bar 270, and has the same shape as the outer shape of the protrusion 271b.
  • the convex portion 271 b is fitted to the concave portion 272 b.
  • the laser welding portion 274 has a linearly extending portion and a circularly extending portion.
  • the bus bar 370 of this embodiment has a linear portion 370a and a branch portion 370b as a bus bar piece.
  • the linear portion 370a is in the form of a linearly extending rectangular plate.
  • the plate surface of the linear portion 370a is orthogonal to the axial direction.
  • the branch portion 370 b is a plate whose plate surface is orthogonal to the axial direction.
  • the branch portion 370b has a first portion 372a and a second portion 372b.
  • the first portion 372a is a portion extending in a direction different from the direction in which the linear portion 370a extends from the linear portion 370a.
  • the first portion 372a extends in the direction perpendicular to both the extending direction of the linear portion 370a and the thickness direction of the linear portion 370a.
  • the second portion 372b extends in a direction parallel to the direction in which the linear portion 370a extends from the tip of the first portion 372a.
  • the laser welded portion 374 joins the linear portion 370a and the branch portion 370b. More specifically, the laser weld 374 joins the straight portion 370a and the first portion 372a. The laser welded portion 374 is exposed to the outside of the bus bar holder.
  • a linear portion 370a and a branch portion 370b are provided as the bus bar piece.
  • the linear portion 370a can suitably increase the number of pieces taken from one plate member. Therefore, the yield of bus bar 370 can be improved.
  • the bus bar 470 of this embodiment has an arc portion 477 extending in an arc shape.
  • the entire bus bar 470 corresponds to an arc portion 477 extending in an arc shape.
  • the plate surface of the arc portion 477 is orthogonal to the axial direction.
  • the arc portion 477 has a semicircular arc shape.
  • the arc portion 477 has a shape of a perfect circular arc.
  • “the arc portion is a circular arc having a perfect circle” means that the distance r from the central curve CL connecting the center in the width direction of the arc portion is the central curve CL when viewed along the thickness direction. It includes the presence of a central point C which is equal at any position.
  • the arc portion 477 is configured by joining a plurality of bus bar pieces 470a, 470b, 470c and 470d by laser welding portions 474a, 474b and 474c. Therefore, the shapes of the bus bar pieces 470a, 470b, 470c, and 470d can be made closer to straight lines, respectively, as compared with the entire shape of the arc portion 477. As a result, in each of the bus bar pieces 470a, 470b, 470c, and 470d, the number of pieces taken from one plate member can be increased. Therefore, the yield of bus bar 470 can be improved as compared to using bus bar 470 as a single member.
  • the bus bar piece 470a and the bus bar piece 470b are joined by the laser welded portion 474a.
  • the bus bar piece 470b and the bus bar piece 470c are joined by the laser welded portion 474b.
  • the bus bar piece 470c and the bus bar piece 470d are joined by the laser welded portion 474c.
  • the bus bar pieces 470a, 470b, 470c, 470d extend in an arc shape.
  • the central angles ⁇ of the bus bar pieces 470a, 470b, 470c, and 470d are the same as one another. Therefore, it is easy to make the bus bar pieces 470a, 470b, 470c, and 470d into the same shape.
  • the bus bar pieces 470a, 470b, 470c, and 470d have the same shape.
  • the arc portion 477 can be manufactured by manufacturing and joining four types of bus bar pieces. Therefore, the manufacturing cost of bus bar 470 can be reduced.
  • bus bar pieces 470a, 470b, 470c, 470d in the width direction orthogonal to both the direction in which bus bar pieces 470a, 470b, 470c, 470d extend and the thickness direction of busbar pieces 470a, 470b, 470c, 470d
  • a virtual line segment connecting the center in and the center at the other ends of the bus bar pieces 470a, 470b, 470c, and 470d is a bus bar virtual line segment IL.
  • the plurality of bus bar pieces 470a, 470b, 470c, and 470d include bus bar pieces that entirely overlap in the bus bar virtual line segment IL when viewed along the thickness direction.
  • all of the bus bar pieces 470a, 470b, 470c, and 470d overlap the entire bus bar virtual line segment IL in each of the bus bar pieces 470a, 470b, 470c, and 470d.
  • the bus bar piece on which the entire bus bar virtual line segment IL overlaps has a shape relatively close to a straight line shape, and it is easy to increase the number of pieces taken from one plate member.
  • the number of the bus bar pieces 470a, 470b, 470c, and 470d can be increased from one plate member, and the yield of the bus bar 470 can be further improved.
  • the bus bar 570 of the present embodiment has a first bus bar piece 570a and a second bus bar piece 570b as bus bar pieces.
  • the first bus bar piece 570 a and the second bus bar piece 570 b are in the form of a linearly extending rectangular plate.
  • the plate surface of the first bus bar piece 570a is orthogonal to the axial direction.
  • the second bus bar piece 570 b extends from the first bus bar piece 570 a in the thickness direction of the first bus bar piece 570 a, that is, in the axial direction.
  • the plate surface of the second bus bar piece 570 b is parallel to the axial direction, and is orthogonal to the width direction of the first bus bar piece 570 a.
  • the laser welded portion 574 joins the first bus bar piece 570 a and the second bus bar piece 570 b.
  • a portion that needs to be bent and manufactured in the case of a single member is joined to the first bus bar piece 570a as the second bus bar piece 570b of another member.
  • the bus bar 570 can be manufactured without performing the bending process.
  • the bonding of the first bus bar piece 570a and the second bus bar piece 570b is performed in the same step as the bonding of the coil connection portion 73 and the coil lead wire 35a, as described in the first embodiment, to save time and labor It can be reduced. Therefore, compared with the case where it is necessary to perform a bending process, the effort which produces bus bar 570 can be reduced.
  • the present invention is not limited to the above-described embodiment, and the following other configurations can be adopted.
  • the number of bus bars is not particularly limited.
  • the shape of the bus bar piece is not particularly limited.
  • the shape of the arc portion is not particularly limited as long as it is an arc shape, and may not be a true arc shape.
  • the arc portion may be elliptical arc shaped.
  • the number of bus bar pieces constituting one bus bar is not particularly limited as long as it is two or more.
  • the bus bar piece may have a plate shape whose plate surface is parallel to the axial direction.
  • the shape of the laser weld is not particularly limited.
  • the laser welding portion may be exposed to any side of the bus bar holder if it is exposed to the outside of the bus bar holder.
  • the laser welds may be exposed radially outward of the bus bar holder.
  • the laser weld may not overlap with the holder through hole.
  • the laser welding portion may be exposed to the upper side of the bus bar holder, and the bus bar holder may have a supporting portion for supporting the laser welding portion from the lower side.
  • the melting point of the support is, for example, higher than the melting point of the other portion of the bus bar holder. Thereby, it can suppress that a support part fuse
  • the melting point of the support portion may be the same as that of the other portions of the bus bar holder.
  • the metal member may be a member other than the bearing holder.
  • the laser weld may not overlap with the metal member.
  • the metal member may not be provided.
  • the timing at which the bus bar pieces are laser welded may be different from the timing at which the coil connection portion and the coil lead wire are welded.
  • the laser welding of the bus bar pieces may be performed before insert molding of the bus bar holder.
  • the connection between the coil connection and the coil leader may not be laser welding. Joining of the coil connection portion and the coil lead wire may be, for example, resistance welding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

La présente invention concerne, selon un aspect : un rotor pourvu d'un arbre disposé le long d'un axe central; un stator pourvu d'une pluralité de bobines et faisant face radialement au rotor avec un espace entre eux; et une unité barre omnibus disposée sur un côté du stator dans la direction axiale. L'unité barre omnibus comprend : des barres omnibus en forme de plaque connectées électriquement aux bobines; et un support de barre omnibus qui maintient la barre omnibus. Les barres omnibus comprennent : une pluralité de pièces de barre omnibus, chacune étant un élément distinct, et une partie de chaque pièce étant intégrée dans le support de barre omnibus; et une section de soudure au laser destinée à relier les pièces de barre omnibus entre elles. La section de soudure au laser est découverte vers l'extérieur du support de barre omnibus.
PCT/JP2018/035963 2017-09-29 2018-09-27 Moteur et procédé de fabrication d'un moteur WO2019065850A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017190131 2017-09-29
JP2017-190131 2017-09-29

Publications (1)

Publication Number Publication Date
WO2019065850A1 true WO2019065850A1 (fr) 2019-04-04

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Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114069930A (zh) * 2020-07-30 2022-02-18 日本电产三协株式会社 电动机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005137174A (ja) * 2003-10-31 2005-05-26 Toyota Motor Corp 固定子製造方法および固定子製造方法により製造される回転電機の固定子
JP2010233327A (ja) * 2009-03-26 2010-10-14 Mitsuba Corp ブラシレスモータ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005137174A (ja) * 2003-10-31 2005-05-26 Toyota Motor Corp 固定子製造方法および固定子製造方法により製造される回転電機の固定子
JP2010233327A (ja) * 2009-03-26 2010-10-14 Mitsuba Corp ブラシレスモータ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114069930A (zh) * 2020-07-30 2022-02-18 日本电产三协株式会社 电动机
CN114069930B (zh) * 2020-07-30 2024-04-16 日本电产三协株式会社 电动机

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