WO2020183693A1 - Stator, machine électrique rotative et procédé de fabrication de stator - Google Patents

Stator, machine électrique rotative et procédé de fabrication de stator Download PDF

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Publication number
WO2020183693A1
WO2020183693A1 PCT/JP2019/010514 JP2019010514W WO2020183693A1 WO 2020183693 A1 WO2020183693 A1 WO 2020183693A1 JP 2019010514 W JP2019010514 W JP 2019010514W WO 2020183693 A1 WO2020183693 A1 WO 2020183693A1
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WO
WIPO (PCT)
Prior art keywords
bus bar
stator
magnetic pole
pole pieces
stator core
Prior art date
Application number
PCT/JP2019/010514
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English (en)
Japanese (ja)
Inventor
啓生 大藤
泰士 山本
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021504746A priority Critical patent/JP7113959B2/ja
Priority to PCT/JP2019/010514 priority patent/WO2020183693A1/fr
Publication of WO2020183693A1 publication Critical patent/WO2020183693A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • 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
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes

Definitions

  • the present invention relates to a stator, a rotary electric machine, and a method for manufacturing a stator.
  • an insulator is attached to the stator core, and an electric wire is wound around a plurality of teeth portions of the stator core to form a coil of a plurality of phases.
  • Some such stators connect the coils of each phase to the bus bar to conduct them (see, for example, Patent Document 1 and Patent Document 2).
  • the present invention has been made to solve the above problems, and obtains a method for manufacturing a stator, a rotary electric machine, and a stator, which can reduce man-hours for processing a bus bar.
  • the stator according to the present invention includes a plurality of magnetic pole pieces, a joint iron piece provided between adjacent magnetic pole pieces, a coil wound around the magnetic pole pieces, and an insulator provided between the magnetic pole pieces and the coil. It is provided with a bus bar that passes through when passing a coil between one magnetic pole piece of a plurality of magnetic pole pieces and another magnetic pole piece, and the magnetic pole piece and the joint iron piece are foldably connected at a thin wall portion, and the bus bar is formed. It is arranged so that it can be folded together with the thin part.
  • the bus bar is bent together with the stator core to form an annular stator. This eliminates the need for the step of forming the bus bar independently in an annular shape, and can reduce the processing cost of the rotary electric machine.
  • FIG. 7 is a plan view showing a state in which the stator core of FIG.
  • FIG. 7A is bent in the opposite direction.
  • FIG. 7 is a plan view showing a state in which the stator core of FIG. 7A is bent in the forward direction. It is a top view which shows the region where the electric wire is wound around the stator core. It is a top view which shows the modification of the stator of Embodiment 1.
  • FIG. FIG. 5 is a plan view showing a state in which the stator of the modified example of FIG. 9 is bent in the opposite direction. It is a figure which shows the manufacturing flow of the stator of Embodiment 1.
  • FIG. 5 is a plan view showing the stator according to the second embodiment of the present invention in a linearly developed state before the electric wire is wound. It is a top view which shows a part of the stator of FIG.
  • FIG. 5 is a partial plan view showing the stator according to the third embodiment of the present invention in a linearly developed state before the electric wire is wound. It is a top view of the stator of FIG. It is a perspective view of the stator of FIG. 18A.
  • FIG. 5 is a plan view showing the stator according to the fourth embodiment of the present invention in a linearly developed state before the electric wire is wound.
  • FIG. 21 is a cross-sectional view taken along the line XXII-XXII of the stator constituting the rotary electric machine of FIG. It is a partially enlarged view of the stator of FIG. It is sectional drawing which shows the 1st modification of the stator of Embodiment 5. It is sectional drawing which shows the 2nd modification of the stator of Embodiment 5.
  • FIG. 1 is a plan view of the stator 200 according to the first embodiment of the present invention as viewed from the axial direction.
  • FIG. 2 is a plan view showing the stator 200 of FIG. 1 in a linearly developed state before the electric wire is wound.
  • FIG. 3 is a perspective view of the stator of FIG.
  • description will be made with reference to figures.
  • the stator 200 includes a stator core 1 composed of a plurality of magnetic pole pieces 2 and a joint iron piece 3 provided between the adjacent magnetic pole pieces 2, a coil 120 wound around each magnetic pole piece 2, and the coil 120. It has an insulator 4 which is an insulator that insulates a magnetic pole piece 2 and a joint iron piece 3 and a coil 120, and a bus bar 5 provided with a terminal for passing a coil of the same phase, and is formed in an annular shape.
  • Each magnetic pole piece 2 and each joint iron piece 3 are formed by laminating a thin plate-shaped electromagnetic steel plate punched out.
  • each magnetic pole piece 2 and each joint iron piece 3 may be formed in the shape of one block.
  • the bus bar 5 is insert-molded into the insulator 4 and integrally forms the bus bar assembly 51.
  • the bus bar assembly 51 is assembled to the stator core 1, and the coil 120 is wound to form the stator 200.
  • FIG. 4 is a diagram showing the bus bar 5 before bending.
  • the bus bar 5 is provided with a plurality of terminals 5A to which the coil 120 is connected.
  • the plurality of terminals 5A are exposed from the insulator 4 and insert-molded.
  • FIG. 5A is a diagram showing the stator core 1 before bending.
  • the stator core 1 is formed by laminating a plurality of punched thin plate-shaped electromagnetic steel sheets in the axial direction of a rotary electric machine.
  • the stator core 1 is formed in a shape in which six magnetic pole pieces 2 and six joint iron pieces 3 are alternately and continuously arranged.
  • a coupling convex portion 10 is formed on the magnetic pole piece 2 that forms one end of the stator core 1.
  • a coupling recess 11 is formed in the joint iron piece 3 forming the other end portion of the stator core 1.
  • the number of magnetic pole pieces 2 and the number of joint iron pieces 3 are the same, but the number of magnetic pole pieces 2 and the number of joint iron pieces 3 are not the same, such as when a plurality of joint iron pieces 3 are provided between the magnetic pole pieces 2. May be good.
  • FIG. 5B is an enlarged view of part A of FIG. 5A.
  • the plurality of magnetic pole pieces 2 forming the stator core 1 are formed on the radial outer side of the stator 200, respectively, and rotate from the first back yoke portion 7A and the first back yoke portion 7A arranged on the outer circumference of the ring. It has a teeth portion 8 extending radially inward toward the center.
  • Each of the plurality of joint iron pieces 3 has a second back yoke portion 7B arranged on the outer periphery of the annular stator 200.
  • a bent portion 6 is formed at the boundary between each magnetic pole piece 2 and each joint iron piece 3.
  • first back yoke portion 7A of the magnetic pole piece 2 and the second back yoke portion 7B of the joint iron piece 3 are distinguished, but the first back yoke portion 7A and the second back yoke portion are distinguished. It is continuous with 7B.
  • each bent portion 6 is formed by a notch 6A and a thin portion 9 that open inward in the radial direction of the stator 200, respectively.
  • the opening 6B of each notch 6A is formed in a tapered shape that widens toward the teeth portion 8 side in a state where the stator core 1 is developed in a straight line before bending.
  • each notch 6A has a circular opening 6D continuous with the tapered opening 6B, and has a keyhole shape as a whole.
  • a bending center point 6C for bending the stator core 1 toward the teeth portion 8 is formed on the thin portion 9 side of the circular opening 6D of each notch 6A. Then, the stator core 1 is bent inward in the radial direction about each bending center point 6C to form an annular shape.
  • each tooth portion 8 is radially inward to form an annular stator 200.
  • bending so that each tooth portion 8 is radially outward is referred to as “bending in the opposite direction”
  • bending so that each tooth portion 8 is radially inward is referred to as “bending in the forward direction”. ..
  • Making each tooth portion 8 into a straight line is called “developing in a straight line”.
  • FIG. 7A to 7C are views showing a bent state of the stator core 1 according to the first embodiment.
  • FIG. 7A shows a state in which the stator core 1 is linearly deployed.
  • FIG. 7B shows a state in which the stator core 1 is bent in the opposite direction.
  • FIG. 7C shows a state in which the stator core 1 is bent in the positive direction.
  • FIG. 8 is a plan view showing a region around which an electric wire is wound around the stator core 1.
  • the coil 120 is formed by winding the electric wire in the region 12 shown by the diagonal line in FIG.
  • a frame of a rotary electric machine (not shown) is arranged on the radial outer side of the core back 13 of the stator core 1 which constitutes the outer peripheral surface of the annular stator 200 on the radial outer side. Therefore, when the stator core 1 forms an annular shape, the bus bar 5 needs to be arranged at a position where each terminal 5A does not protrude radially outward from the core back 13. Therefore, as shown by the alternate long and short dash line in FIG. 9, the conventional bus bar 5C is arranged at a position radially inside the bending center C of the stator core 1 and radially outside the region 12 of the teeth portion 8. It had been.
  • the shaded area in the drawing shows the insulator 4.
  • the bus bar 5C does not overlap with each bending center point 6C of the stator core 1. Therefore, in the step of bending the stator core 1, the bus bar 5C cannot be easily bent. Then, when the bus bar 5C is bent, the bus bar 5C is greatly expanded and contracted. In addition, when the bus bar 5C is bent, the position of the bus bar 5C may shift. If the position of the bus bar 5C is deviated, the electric wire and each terminal 5A of the bus bar 5C may interfere with each other when the electric wire is wound around each tooth portion 8.
  • a plurality of bent portions 14 are formed on the bus bar 5.
  • the bus bar 5 is arranged along the longitudinal direction of the stator core 1. Then, each bent portion 14 of the bus bar 5 is arranged in a state of being insert-molded in the insulator 4 so as to overlap the bending center point 6C of each bent portion 6 of the stator core 1. As a result, as shown in FIG. 10, when each bent portion 6 of the stator core 1 is bent, each bent portion 14 of the bus bar 5 is bent together.
  • the pitches P1 to P3 of the two bending center points 6C formed at both ends of one magnetic pole piece 2 do not change even when the stator core 1 is bent. Therefore, if the bent portions 14 of the bus bar 5 are arranged so as to overlap each bending center point 6C of the stator core 1, the bus bar 5 can be bent without causing a large expansion and contraction when the stator core 1 is bent.
  • the linear bus bar 5 and the insulator 4 are integrated and assembled to the linear stator core 1.
  • the stator core 1 is assembled so that the bending center points 6C of the stator core 1 and the bending portions 14 of the bus bar 5 overlap each other.
  • the stator core 1 and the bus bar 5 are integrally bent and formed into an annular shape. The amount of expansion and contraction of the bus bar 5 when the bus bar 5 is bent can be reduced, and an increase in the internal resistance of the bus bar 5 can be suppressed. As a result, the efficiency of the rotary electric machine can be improved.
  • each terminal 5A of the bus bar 5 can be arranged so as to be moved inward in the radial direction of the stator core 1. Therefore, the outer diameter of the stator 200 can be reduced, and the rotary electric machine can be miniaturized.
  • FIG. 11 is a diagram showing a manufacturing flow of the stator 200.
  • step 1 the electromagnetic steel sheet is punched in step 1 (ST1), and a plurality of electromagnetic steel sheets are laminated to form a linear stator core 1.
  • step 2 the bus bar 5 and the insulator 4 are previously integrated by insert molding and attached so that each bent portion 14 of the bus bar 5 overlaps the position of each bent portion 6 of the stator core 1.
  • step 3 each bent portion 6 of the stator core 1 is bent in the opposite direction together with the bus bar 5 and the insulator 4 integrated by insert molding.
  • step 4 an electric wire is wound around each tooth portion 8 via an insulator 4 to form a coil 120.
  • step 5 each bent portion 6 of the stator core 1 is bent in the positive direction to form an annular shape.
  • the stator 200 is completed.
  • the work of winding the electric wire around each tooth portion 8 may be performed in a state where the stator core 1 is developed in a straight line. In this case, since the stator core 1 is not bent in the opposite direction in order to wind the electric wire, the metal fatigue of the bus bar 5 can be reduced, and the work can be reduced by one.
  • FIG. 12 is a plan view showing the stator 200 according to the second embodiment of the present invention in a linearly developed state before the electric wire is wound.
  • FIG. 13 is a diagram showing three portions of the joint iron piece of FIG. 14A and 14B are a perspective view and a plan view of the bus bar of FIG.
  • the bus bar 5 is different from the stator 200 of the first embodiment. Since other configurations are the same as those in the first embodiment, detailed description thereof will be omitted.
  • the bus bar 5 used in the stator 200 of the second embodiment has a convex portion 15 at a position corresponding to each joint iron piece 3 of the stator core 1.
  • each convex portion 15 is formed by three bent portions 16A to 16C, respectively. Then, as shown in FIG. 15, of the three bent portions 16A to 16C, the bent portion 16B and the bent portion 16C are located at the bent portion 6 of the stator core 1.
  • Each convex portion 15 deforms when the bus bar 5 is bent, and absorbs a force that tries to expand and contract the bus bar 5. For example, as shown by the broken line in FIG. 15, when the stator core 1 is bent outward in the radial direction, the bent portions 16A to 16C are further bent to absorb the force for contracting the bus bar 5. On the other hand, when the stator core 1 is bent inward in the radial direction, the bent portions 16A to 16C expand to absorb the force for extending the bus bar 5.
  • the stator 200 of the second embodiment has a convex portion 15 at a position corresponding to each joint iron piece 3 of the stator core 1 of the bus bar 5. Then, when the stator core 1 is bent, the three bent portions 16 of each convex portion 15 are bent or expanded to absorb the force for expanding and contracting the bus bar 5. As a result, the amount of expansion and contraction of the bus bar 5 can be reduced, and an increase in the internal resistance of the bus bar 5 can be suppressed. Further, when the stator core 1 is bent, the position of the bus bar 5 can be prevented from being displaced, and the quality of the stator 200 can be stabilized.
  • the convex portion has a shape that is convex outward in the radial direction, but the shape of the convex portion is not limited to this.
  • the shape of the convex portion may be a shape that is convex inward in the radial direction, or a plurality of convex portions may be continuously formed.
  • the shape of the convex portion is triangular, but as shown in FIG. 16, the convex portion may be arcuate.
  • FIG. 17 is a partial plan view showing the stator 200 according to the third embodiment of the present invention in a linearly unfolded state before the electric wire is wound.
  • FIG. 18A is a plan view of the stator 200 of FIG.
  • FIG. 18B is a perspective view of the stator 200 of FIG. 18A.
  • the range covering the bus bar 5 of the insulator is different from that of the first embodiment. Since other configurations are the same as those in the first embodiment, detailed description thereof will be omitted.
  • the magnetic pole piece 2 side from each bent portion 14 of the bus bar 5 is covered with an insulating material to form the insulator 4.
  • FIG. 19 is a plan view showing the stator according to the fourth embodiment of the present invention in a linearly developed state before the electric wire is wound.
  • 20A to 20C are plan views showing a bent state of the stator 200 of FIG.
  • the range covering the bus bar 5 of the insulator 4 is different from that of the first embodiment.
  • the bus bar 5 of the present embodiment is different from the first embodiment in that it does not have a bent portion 14. Since other configurations are the same as those in the first embodiment, detailed description thereof will be omitted.
  • the bus bar 5 is arranged on the teeth portion 8 side of the position of the bending center point 6C of the stator core 1. Further, the boundary portion 20 which is the boundary between the insulator 4 covering the bus bar 5 and the portion where the bus bar 5 is exposed from the insulator 4 is separated from the bent portion 6 toward the magnetic pole piece 2. There is. As a result, as shown in FIG. 20B, when the stator core 1 is bent radially outward, the bus bar 5 moves radially outward of the stator core 1. On the other hand, as shown in FIG. 20C, when the stator core 1 is bent inward in the radial direction, the bus bar 5 moves inward in the radial direction of the stator core 1.
  • the process of forming the bus bar 5 independently in an annular shape can be reduced, and the processing cost of the rotary electric machine can be reduced. Further, the amount of expansion and contraction of the bus bar 5 can be reduced, and an increase in the internal resistance of the bus bar 5 can be suppressed. Therefore, the efficiency of the rotary electric machine can be improved. Further, the bus bar 5 can be arranged on the innermost side in the radial direction of the stator core 1. As a result, the diameter of the stator core 1 can be reduced, and the size of the rotary electric machine can be reduced.
  • FIG. 21 is a cross-sectional view taken along the axial direction of the rotary electric machine using the stator 200 according to the fifth embodiment of the present invention.
  • the rotary machine is a pump.
  • the portion hatched by the diagonal line is the molded resin portion 601 molded with resin.
  • the rotor portion 608 located inside the stator 200 is not molded.
  • the mold resin portion 601 covers all of the coil 120, and also covers all of the plurality of magnetic pole pieces 2 and the plurality of joint iron pieces 3. Further, the bus bar 602 connecting the coil 120 wound around the magnetic pole piece 2 is also covered with resin by molding.
  • FIG. 22 is a cross-sectional view taken along the line XXII-XXII of the stator 200 constituting the rotary electric machine of FIG. 21.
  • the portion indicated by the diagonal line is the mold resin portion 601.
  • the stator 200 covered by the mold resin portion 601 is shown through the mold resin portion 601.
  • FIG. 23 is a partially enlarged view of the stator 200 of FIG. 22.
  • the bus bars 602 and 604 are arranged in the vicinity of the cylindrical frame 605 that covers the outer periphery of the stator 200. Therefore, for example, when the pump vibrates and the bus bars 602 and 604 move, the bus bars 602 and 604 touch the frame 605 and become conductive, which may cause a problem in the operation of the pump.
  • the bus bars 602 and 604 are covered by the mold resin portion 601. Therefore, as shown in the region B and the region C shown by the alternate long and short dash line in FIG. 23, the resin is filled between the bus bars 602 and 604 and the frame 605. As a result, even when the pump vibrates, it is possible to prevent the bus bars 602 and 604 from coming into contact with the frame 605 and conducting conduction.
  • the heat of the bus bars 602 and 604 generated when the coil 120 is energized is dissipated through the mold resin portion 601. Therefore, it is not necessary to increase the heat capacity of the magnetic pole piece 2, and the stator 200 can be miniaturized.
  • the mold resin portion 601 also covers the entire coil 120. Therefore, the insulating property of the coil 120 can be improved.
  • PPS resin polyphenylene sulfide resin
  • POM resin polyacetal resin
  • EP resin epoxy resin
  • FIG. 24 is a cross-sectional view showing a first modification of the stator 200 of the fifth embodiment.
  • the stator 200 covered by the mold resin portion 606 is shown through the mold resin portion 606.
  • the mold resin portion 606 covers the core back 13 side of the plurality of magnetic pole pieces 2 and the plurality of joint iron pieces 3. Therefore, the heat of the bus bars 602 and 604 generated when the coil 120 is energized can be efficiently dissipated through the mold resin portion 606.
  • the amount of resin used for molding the mold resin portion 606 can be reduced. Therefore, the price of the pump as a product can be suppressed. Further, in this example, the gap 607 between the adjacent magnetic pole pieces 2 is not covered with the resin. Therefore, the flow rate of the fluid passing through the pump can be increased.
  • FIG. 25 is a cross-sectional view showing a second modification of the stator of the fifth embodiment.
  • the stator 200 covered by the mold resin portion 606 is shown through the mold resin portion 606.
  • the coil 120 is covered with resin. Therefore, the heat generated when the coil 120 is energized can be efficiently dissipated through the mold resin portion 606.
  • stator core 1 stator core, 2 magnetic pole pieces, 3 joint iron pieces, 4 insulation, 5 busbars, 6 bent parts, 6A notches, 6B openings, 6C bending center points, 6D openings, 7A first back yoke parts, 7B second Back yoke part, 8 teeth part, 9 thin wall part, 10 joint convex part, 11 joint concave part, 12 area, 13 core back, 14 bent part, 15 convex part, 16A to 16C bent part, 20 boundary part, 51 busbar assembly , 120 coil, 200 stator, 601,606 mold resin part, 602,604 bus bar, 605 frame, 607 gap, 608 rotor part.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Windings For Motors And Generators (AREA)
  • Motor Or Generator Frames (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

L'invention concerne un stator comprenant : une pluralité de pièces polaires magnétiques ; un élément culasse disposé entre les pièces polaires magnétiques adjacentes ; des bobinages enroulés autour des pièces polaires magnétiques ; un isolant disposé entre les pièces polaires magnétiques et les bobinages ; et une barre omnibus à travers laquelle les bobinages passent de l'une de la pluralité des pièces polaires magnétiques à une autre. Les pièces polaires magnétiques et l'élément culasse sont reliés l'un à l'autre au niveau d'une partie de paroi mince de manière flexible, et la barre omnibus est disposée conjointement avec la partie de paroi mince de manière flexible.
PCT/JP2019/010514 2019-03-14 2019-03-14 Stator, machine électrique rotative et procédé de fabrication de stator WO2020183693A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2021504746A JP7113959B2 (ja) 2019-03-14 2019-03-14 ステータ、回転電機及びステータの製造方法
PCT/JP2019/010514 WO2020183693A1 (fr) 2019-03-14 2019-03-14 Stator, machine électrique rotative et procédé de fabrication de stator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/010514 WO2020183693A1 (fr) 2019-03-14 2019-03-14 Stator, machine électrique rotative et procédé de fabrication de stator

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WO2020183693A1 true WO2020183693A1 (fr) 2020-09-17

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005160170A (ja) * 2003-11-21 2005-06-16 Fujitsu General Ltd 電動機
JP2008312277A (ja) * 2007-06-12 2008-12-25 Fuji Heavy Ind Ltd 電動機
JP2009130963A (ja) * 2007-11-20 2009-06-11 Mitsubishi Heavy Ind Ltd バスバー構造およびインバータ一体型電動圧縮機
JP2015070632A (ja) * 2013-09-26 2015-04-13 株式会社ミツバ バスバーユニット、バスバーユニットの製造方法およびブラシレスモータ
JP2015100147A (ja) * 2013-11-18 2015-05-28 三菱電機株式会社 固定子およびその固定子を備えた回転電機

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6584331B2 (ja) 2016-01-25 2019-10-02 三菱電機株式会社 単相ブラシレスモータおよび単相ブラシレスモータの製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005160170A (ja) * 2003-11-21 2005-06-16 Fujitsu General Ltd 電動機
JP2008312277A (ja) * 2007-06-12 2008-12-25 Fuji Heavy Ind Ltd 電動機
JP2009130963A (ja) * 2007-11-20 2009-06-11 Mitsubishi Heavy Ind Ltd バスバー構造およびインバータ一体型電動圧縮機
JP2015070632A (ja) * 2013-09-26 2015-04-13 株式会社ミツバ バスバーユニット、バスバーユニットの製造方法およびブラシレスモータ
JP2015100147A (ja) * 2013-11-18 2015-05-28 三菱電機株式会社 固定子およびその固定子を備えた回転電機

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