WO2022201260A1 - 回転電機のステータ - Google Patents

回転電機のステータ Download PDF

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Publication number
WO2022201260A1
WO2022201260A1 PCT/JP2021/011799 JP2021011799W WO2022201260A1 WO 2022201260 A1 WO2022201260 A1 WO 2022201260A1 JP 2021011799 W JP2021011799 W JP 2021011799W WO 2022201260 A1 WO2022201260 A1 WO 2022201260A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
stator
electric machine
connection members
coil element
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/JP2021/011799
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
洋三 廣瀬
友克 姫野
陽平 野口
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to PCT/JP2021/011799 priority Critical patent/WO2022201260A1/ja
Priority to JP2023508180A priority patent/JP7477046B2/ja
Publication of WO2022201260A1 publication Critical patent/WO2022201260A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings

Definitions

  • the present invention relates to a stator of a rotating electric machine.
  • WO2020/213651A1 a plurality of rectangular wires bent in a U shape are inserted into a stator, and portions protruding from the stator (coil ends) are bent and connected for each phase to form a distributed winding coil.
  • An electric machine is disclosed.
  • the continuous output of a rotating electric machine is restricted by factors such as the upper temperature limit for ensuring insulation of the coil coating and the upper temperature limit for preventing demagnetization of the magnet. Therefore, efficient cooling of the coils is important for continuous operation of the rotating electric machine.
  • a structure in which the coil and the refrigerant directly exchange heat for example, a structure in which the coil and a cooler in which the refrigerant circulates are in contact is desirable.
  • an object of the present invention is to provide a stator for a rotating electric machine that can cool the coils at the coil ends.
  • a stator core having a plurality of slots, coil elements inserted through the respective slots, and a plurality of connection members connected to ends of the coil elements for connecting the coil elements to each other are provided.
  • a stator core for a rotating electric machine is provided.
  • the wire connection members are arranged in an annular shape in the circumferential direction of the stator core to form a separate end coil, and each wire connection member is connected to the coil element in a direction perpendicular to it.
  • the separate end coil has a cooling portion configured by arranging at least a part of each wire connection member on the same plane perpendicular to the extension direction of the coil element.
  • FIG. 1 is an exploded perspective view of a stator.
  • FIG. 2 is a side view of the wire connection member.
  • FIG. 3 is a diagram showing a connection state between a pair of slots.
  • FIG. 4 is a diagram showing a connection state between the slot coil and the separate end coil.
  • FIG. 5 is a diagram for explaining the connection angle of the wire connection members.
  • FIG. 6 is a perspective view for explaining the two-layer structure of the separate end coil.
  • FIG. 7 is a side view for explaining the two-layer structure of the separate end coil.
  • FIG. 8 is a diagram for explaining the cooling surface.
  • FIG. 9 is a diagram showing an example of a cooler.
  • FIG. 10 is a diagram showing a protruding portion of a coil element when no separate end coil is used.
  • FIG. 11 is a diagram showing a connection state between coil elements when a separate end coil is not used.
  • FIG. 1 is an exploded perspective view of a stator 1 according to this embodiment.
  • a stator 1 includes a stator core 2 , slot coils 3 and separate end coils 4 .
  • radial direction, axial direction, and circumferential direction mean the radial direction, axial direction, and circumferential direction of the stator core 2, respectively.
  • the stator core 2 is formed by laminating a plurality of plate-like electromagnetic steel sheets in the thickness direction thereof, and includes a plurality of teeth 2A protruding radially inward and slots 5 formed between adjacent teeth 2A. Prepare.
  • the slot coil 3 is an aggregate of a plurality of substantially U-shaped coil elements 3A, and has a cylindrical shape as a whole.
  • the coil element 3A is composed of a plurality of rectangular wires.
  • the rectangular wire is made of a conductor material such as copper or aluminum.
  • Each rectangular wire is coated with an insulator such as enamel, except for both ends to which connecting members 6, which will be described later, are connected.
  • the slot coil 3 is inserted into the slot 5 from one end side of the stator core 2 . Insulating paper is inserted into each slot 5, so that the slot coil 3 and the teeth 2A are electrically insulated.
  • the separate end coil 4 is an assembly of wire connection members 6 that electrically connect specific end portions of the slot coils 3 protruding from the stator core 2 through the slots 5, and has an annular shape as a whole.
  • the wire connection member 6 and the separate end coil 4 will be described with reference to FIG.
  • FIG. 2 is a side view of the wire connection member 6.
  • connection member 6 is made of a conductor material and has a leg portion 6A and connection portions 6B provided at both ends of the leg portion 6A.
  • the leg portion 6A has, for example, a leaf spring shape bent at an intermediate portion as shown in FIG.
  • the distance from one connection portion 6B to the other connection portion 6B is longer than the distance between the ends of the slot coils 3 to which the wire connection members 6 are connected. That is, the wire connection member 6 is connected to the slot coil 3 in a state in which the two connection portions 6B are elastically deformed in the approaching direction. In other words, the wire connection member 6 applies elastic force to the ends of the connected slot coils 3 .
  • connection portion 6B has a bent shape, but the shape is not limited to this.
  • the separate end coil 4 is formed by arranging a plurality of connection members 6 in an annular shape.
  • the separate end coil 4 is combined with the slot coil 3 in a state in which a plurality of wire connection members 6 are temporarily assembled into an annular shape using a jig.
  • each connecting member 6 and each coil element 3A are electrically connected by a method such as welding, soldering, contact connection, solid phase bonding, or adhesion using a conductive adhesive, and the jig is removed.
  • the connection between the separate end coil 4 and the slot coil 3 is also referred to as a stator coil 20 .
  • FIG. 3 is a perspective view showing a connection state between the coil element 3AA passing through the slot 5A and the coil element 3AB passing through the slot 5B.
  • connection members 6 that connect the coil element 3AA and the coil element 3AB are laminated in the radial direction.
  • the shape of the connection member 6 in the vicinity of the connection portion 6B is appropriately changed to avoid interference with other connection members 6. As shown in FIG.
  • the coil element 3A of the present embodiment includes three flat wires (first coils) with relatively large protrusions from the ends of the stator core 2 and three flat wires (second coils) with relatively small protrusions. are arranged alternately in the radial direction.
  • a connecting member 6 connects the second radially inner end of the coil element 3AA of the slot 5A and the radially innermost end of the coil element 3AB of the slot 5B.
  • another connecting member 6 connects the fourth radially inner end of the coil element 3AA and the third radially inner end of the coil element 3AB.
  • another connecting member 6 connects the radially outermost end of the coil element 3AA and the fifth radially inner end of the coil element 3AB. That is, among the coil elements 3AA in one slot 5A, there are three flat wires with relatively large protrusions, and among the coil elements 3AB in the other slot 5B, there are three flat wires with relatively small protrusions. is connected.
  • the other coil elements 3A are also connected in a similar manner. Therefore, the state in which the separate end coil 4 is attached to the slot coil 3 is as shown in FIG.
  • the elastic force applied to the coil element 3A from the connecting member 6 described above acts on the coil element 3AA and the coil element 3AB in a direction away from each other (that is, substantially in the circumferential direction).
  • the coil element 3AA and the coil element 3AB are each pressed against the slot 5, and the slot coil 3 is fixed to the slot 5 by the frictional force generated thereby.
  • FIG. 5 is a perspective view of FIG. 4 viewed from another angle.
  • each connecting member 6 is connected perpendicularly to the extending direction of the coil element 3A.
  • the connecting member 6 has a side surface from the connection portion 6B to the intermediate portion of the leg portion 6A (hereinafter referred to as a side surface 6C) formed of one plane. Therefore, in the separate end coil 4, at least a portion of each wire connection member 6 (here, a side surface 6C from a connection portion 6B connected to a rectangular wire having a relatively large amount of protrusion to an intermediate portion) is a coil. They are arranged on the same plane perpendicular to the extending direction of the element 3A. It should be noted that the "extension direction of the coil element 3A" here is synonymous with the axial direction.
  • FIG. 6 is a perspective view showing the separate end coil 4 assembled to the slot coil 3
  • FIG. 7 is a side view of the separate end coil 4 assembled to the slot coil 3.
  • each wire connection member 6 has one connection portion 6B connected to a rectangular wire that protrudes from the end of the stator core 2 by a relatively large amount, and the other connection portion 6B that protrudes from the end of the stator core 2. It is connected to a flat wire with a relatively small amount. Moreover, the side surface 6C of each wire connection member 6 from the connection portion 6B connected to the flat wire having a relatively large amount of protrusion to the intermediate portion is arranged on the same plane orthogonal to the extension direction of the coil element 3A.
  • each wire connection member 6 from the connection portion 6B connected to the rectangular wire having a relatively small amount of protrusion to the intermediate portion is also orthogonal to the extension direction of the coil element 3A and is also perpendicular to the side surface 6C. lined up on a plane different from the plane on which That is, as shown in FIGS. 6 and 7, the separate end coil 4 has a two-layer structure in which the connecting portion 6B is divided into two layers in the extension direction of the coil element 3A.
  • FIG. 8 is a diagram showing a plane perpendicular to the extension direction of the coil element 3A (hereinafter referred to as a plane S) on which the side surfaces 6C of the wire connection members 6 are arranged. Note that the plane S is a virtual plane.
  • each wire connection member 6 is arranged in an annular shape
  • the side surface 6C of each wire connection member 6 is arranged along the annular portion C of the plane S as shown in FIG.
  • each side surface 6C is in contact with the annular portion C. Therefore, if a cooler 10 (the cooler 10 will be described later) having a flat surface corresponding to the annular portion C as the heat exchange surface 11 is used, each side surface 6C will be in contact with the heat exchange surface 11, and a sufficient contact area can be ensured.
  • the side surface 6C extends from the connection portion 6B connected to the flat wire having a relatively large amount of protrusion to the intermediate portion.
  • approximately half of the entire side surface from one connection portion 6B to the other connection portion 6B of the wire connection member 6 is the side surface 6C in contact with the heat exchanging surface 11 .
  • the ratio of the side faces 6C to the entire side faces of the connecting member 6 is not limited to approximately half.
  • FIG. 9 is a diagram showing an example of the cooler 10 described above.
  • the cooler 10 includes an annular body portion 10B, an inlet 10A, and an outlet 10C. Inside the body portion 10B, there is provided a coolant channel that communicates between the inlet 10A and the outlet 10C. As indicated by arrows in the drawing, the refrigerant is supplied from the inlet 10A to the body 10B, branches and flows inside the body 10B, joins before the discharge port 10C, and is discharged from the discharge port 10C.
  • the body portion 10B has a heat exchange surface 11 configured by an annular flat surface.
  • the heat exchange surface 11 has the same shape as the annular portion C described above.
  • the cooler 10 is arranged so that the heat exchange surface 11 coincides with the annular portion C. As a result, the side surface 6C of each connecting member 6 comes into contact with the heat exchange surface 11. As shown in FIG. That is, the side surface 6C of each connecting member 6 constitutes a cooling portion that exchanges heat with the heat exchange surface 11. As shown in FIG.
  • the structure of the cooler 10 described above is merely an example. Although the provision of the heat exchange surface 11 is essential, other configurations such as the arrangement of the inlet 10A and the outlet 10C, the refrigerant flow path in the body portion 10B, etc. are not limited to those shown in FIG.
  • a contact area between the stator coil 20 and the cooler 10 is ensured by bringing the cooling portion formed by arranging the side surfaces 6C of the respective wire connection members 6 on the same plane into contact with the heat exchange surface 11 of the cooler 10. while the stator coil 20 can be directly cooled.
  • a housing having coolant flow paths is provided on the outer peripheral portion of the stator core 2 . According to this, heat exchange between the stator coil 20 and the coolant passage is performed via the housing, the stator core 2, the insulating paper, the varnish for fixing the slot coil, and the like.
  • FIG. 10 shows a state in which the slot coils 3 are passed through the stator core 2
  • FIG. 11 schematically shows a state in which a pair of ends are connected.
  • each coil element 3A is bent so that the side surface 6C of each coil element 3A is bent as described above. must be aligned on the plane S.
  • the accuracy of aligning the side surfaces 6C of the coil elements 3A on the plane S also has the same variation. As a result, the side surfaces 6C of some of the coil elements 3A do not come into contact with the heat exchange surface 11, and there is a possibility that sufficient cooling performance cannot be obtained.
  • the side surfaces 6C of the connection members 6 can be aligned on the same plane. can be aligned with high accuracy.
  • the coil elements 3A are held by a jig or the like and a load is applied thereto. It is difficult in practice.
  • each wire connection member 6 can be positioned with high accuracy by using a jig, so that a stable contact state can be ensured even in contact-type connection.
  • the stator core 2 having a plurality of slots 5, the coil elements 3A inserted into the respective slots 5, and the plurality of coil elements 3A connected to the ends of the coil elements 3A for connecting the coil elements 3A to each other.
  • a stator 1 for a rotating electric machine is provided, which has a connection member 6 .
  • the wire connection members 6 are arranged in an annular shape in the circumferential direction of the stator core 2 to form the separate end coil 4, and each wire connection member 6 is connected perpendicularly to the coil element 3A.
  • the separate end coil 4 has a cooling portion configured by arranging at least a part of each wire connection member 6 on the same plane perpendicular to the extending direction of the coil element 3A.
  • the stator coil 20 can be directly cooled by bringing the cooler 10 into contact with the cooling portion. Moreover, even if the heat exchange surface 11 of the cooler 10 is a simple plane, a sufficient contact area can be secured, so the manufacturing cost of the cooler 10 can be suppressed.
  • the separate end coil 4 has a two-layer structure in which the connecting portion with the coil element 3A is divided into two layers in the extension direction of the coil element 3A.
  • the coil element 3A is composed of a first coil having a relatively large amount of protrusion from the slot 5 and a second coil having a relatively small amount of protrusion. One end is connected to the end of the coil, and the other end is connected to the end of the second coil.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
PCT/JP2021/011799 2021-03-22 2021-03-22 回転電機のステータ Ceased WO2022201260A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2021/011799 WO2022201260A1 (ja) 2021-03-22 2021-03-22 回転電機のステータ
JP2023508180A JP7477046B2 (ja) 2021-03-22 2021-03-22 回転電機のステータ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/011799 WO2022201260A1 (ja) 2021-03-22 2021-03-22 回転電機のステータ

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PCT/JP2021/011799 Ceased WO2022201260A1 (ja) 2021-03-22 2021-03-22 回転電機のステータ

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WO (1) WO2022201260A1 (cs)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015151200A1 (ja) * 2014-03-31 2015-10-08 本田技研工業株式会社 回転電機のステータ
JP2018143060A (ja) * 2017-02-28 2018-09-13 本田技研工業株式会社 回転電機のステータ
JP2019161993A (ja) * 2018-03-16 2019-09-19 本田技研工業株式会社 回転電機およびこれを搭載した車両

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013090391A (ja) * 2011-10-14 2013-05-13 Nippon Soken Inc 回転電機
CN108604850B (zh) * 2016-02-03 2020-12-15 三菱电机株式会社 旋转电机

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015151200A1 (ja) * 2014-03-31 2015-10-08 本田技研工業株式会社 回転電機のステータ
JP2018143060A (ja) * 2017-02-28 2018-09-13 本田技研工業株式会社 回転電機のステータ
JP2019161993A (ja) * 2018-03-16 2019-09-19 本田技研工業株式会社 回転電機およびこれを搭載した車両

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JPWO2022201260A1 (cs) 2022-09-29
JP7477046B2 (ja) 2024-05-01

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