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WO2023013197A1 - Moteur et procédé de fabrication de moteur - Google Patents

Moteur et procédé de fabrication de moteur Download PDF

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Publication number
WO2023013197A1
WO2023013197A1 PCT/JP2022/019743 JP2022019743W WO2023013197A1 WO 2023013197 A1 WO2023013197 A1 WO 2023013197A1 JP 2022019743 W JP2022019743 W JP 2022019743W WO 2023013197 A1 WO2023013197 A1 WO 2023013197A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
resin portion
motor
resin
coil end
Prior art date
Application number
PCT/JP2022/019743
Other languages
English (en)
Japanese (ja)
Inventor
公亮 竹田
Original Assignee
日本電産株式会社
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 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN202290000300.8U priority Critical patent/CN220605696U/zh
Priority to JP2023539655A priority patent/JPWO2023013197A1/ja
Publication of WO2023013197A1 publication Critical patent/WO2023013197A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • 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
    • H02K5/08—Insulating casings
    • 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
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets

Definitions

  • the present invention relates to motors and motor manufacturing methods.
  • Patent Literature 1 discloses a rotating electric machine having a case through which a first coolant flows.
  • the case includes a water jacket through which cooling water flows as the first coolant. By providing the water jacket, the rotating electric machine can be cooled by water cooling.
  • the water jacket is positioned in the case that houses the stator.
  • it is necessary to bring the inner surface of the case into contact with the outer peripheral surface of the stator.
  • a gap may occur between the case and the stator. Therefore, it is difficult to efficiently transfer the heat of the stator to the water jacket.
  • the cooling efficiency is not so good in the configuration in which the stator is cooled by the water jacket as in Patent Document 1.
  • An object of the present invention is to provide a motor that can efficiently cool the stator.
  • a motor includes a stator having a cylindrical stator core extending along an axis and a stator coil wound around the stator core; and a resin portion covering at least a portion of the radially outer side of the stator core.
  • the resin portion has a cooling portion that cools the stator on the radially outer side.
  • a motor manufacturing method is a method for manufacturing a motor having the above configuration.
  • the method of manufacturing the motor includes a stator forming step of forming a stator, and a resin molding step of forming a resin portion having a cooling portion on the radially outer side by molding at least a part of the radially outer side of the stator with a resin. and a casing housing step of housing the stator molded with the resin in a casing.
  • FIG. 1 is a diagram schematically showing a schematic configuration of a motor according to Embodiment 1.
  • FIG. 2 is a diagram illustrating a method of manufacturing a motor.
  • FIG. 3 is a view equivalent to FIG. 1 according to a modification of the first embodiment.
  • FIG. 4 is a view corresponding to FIG. 1 of the motor according to the second embodiment.
  • the direction parallel to the central axis P is defined as the "axial direction”
  • the direction perpendicular to the central axis P is defined as the "radial direction”
  • the direction along an arc centered on the central axis P is defined as the “axis direction.” Circumferential direction”, respectively.
  • this definition is not intended to limit the orientation of the motor 1 when in use.
  • FIG. 1 is a diagram showing a schematic configuration of a motor 1 according to Embodiment 1 of the present invention.
  • a motor 1 includes a rotor 2 , a stator 3 , a resin portion 4 and a casing 5 .
  • the rotor 2 rotates around the central axis P with respect to the stator 3 .
  • the motor 1 is a so-called inner rotor type motor in which a rotor 2 is rotatably positioned about a central axis P within a cylindrical stator 3 .
  • the rotor 2 includes a shaft 20 , a rotor core 21 and rotor magnets 22 .
  • the rotor 2 is positioned radially inward of the stator 3 and is rotatable with respect to the stator 3 . Since the configuration of the rotor 2 is the same as that of the conventional configuration, detailed description of the rotor 2 is omitted.
  • the stator 3 is cylindrical.
  • the rotor 2 is positioned radially inward of the stator 3 . That is, the stator 3 is positioned facing the rotor 2 in the radial direction.
  • the rotor 2 is rotatably positioned about the central axis P radially inward of the stator 3 .
  • the stator 3 includes a stator core 31 and stator coils 32 .
  • the stator coil 32 is wound around the stator core 31 .
  • the stator core 31 is cylindrical.
  • the stator core 31 has a plurality of slots arranged in the circumferential direction on its inner peripheral surface. Each slot extends axially with respect to the stator 3 . Each slot accommodates an axially extending stator coil 32 . Illustration of the slots is omitted.
  • stator coil 32 accommodated in each slot of the stator core 31 protrudes outward from the axial end of the stator core 31 .
  • Coil ends 33 are portions of the stator coil 32 that protrude from both ends of the stator core 31 in the axial direction.
  • the coil ends 33 are positioned axially outward from both ends of the stator core 31 in the axial direction.
  • the resin portion 4 covers the stator 3. Specifically, the resin portion 4 covers the radially outer side of the stator core 31 of the stator 3 , the radially outer side and the radially inner side of the coil ends 33 of the stator 3 , and the axial ends of the coil ends 33 . .
  • the coil ends 33 of the stator 3 and the rotor 2 are electrically insulated by the resin portion 4 .
  • the resin portion 4 has a cooling portion 46 for cooling the stator 3 on the radially outer side.
  • the stator 3 is cooled by the cooling portion 46 of the resin portion 4 .
  • the casing 5 is cylindrical.
  • a casing 5 houses the rotor 2 and the stator 3 .
  • the radially outer side of the resin portion 4 is in contact with the inner surface of the casing 5 .
  • the stator core 31 whose radial outside is covered with the resin portion 4 can be held with respect to the casing 5 .
  • the configuration of the resin portion 4 will be described with reference to FIG.
  • the resin portion 4 is formed by molding the stator 3 with resin. That is, the resin portion 4 is in close contact with the radially outer side of the stator core 31 . In addition, the resin portion 4 is in close contact with the coil end 33 as a whole. That is, the stator 3 and the resin portion 4 are integrated.
  • the resin portion 4 contains an epoxy resin.
  • the resin portion 4 includes a stator core radially outer resin portion 41 , a coil end radially outer resin portion 42 , a coil end axial resin portion 43 , and a coil end radially inner resin portion 44 .
  • the stator core radially outer resin portion 41, the coil end radially outer resin portion 42, the coil end axial resin portion 43, and the coil end radially inner resin portion 44 are integrated.
  • the stator core radially outer resin portion 41 is a portion of the resin portion 4 located radially outward of the stator core 31 of the stator 3 .
  • the coil end radially outer resin portion 42 is a portion of the resin portion 4 located radially outward of the coil end 33 .
  • the coil end axial resin portion 43 is a portion of the resin portion 4 located axially outward of the coil end 33 .
  • the coil end radially inner resin portion 44 is a portion of the resin portion 4 located radially inward of the coil end 33 .
  • the resin portion 4 has a stator core radially outer resin portion 41 that covers the radially outer side of the stator core 31 of the stator 3 .
  • the resin portion 4 has a coil end radially outer resin portion 42 that covers the radially outer side of the coil end 33 of the stator 3 .
  • the resin portion 4 has a coil end axial resin portion 43 that covers the axial ends of the coil ends 33 of the stator 3 .
  • the resin portion 4 has a coil end radially inner resin portion 44 that covers the radially inner side of the coil end 33 of the stator 3 .
  • the resin portion 4 has the cooling portion 46 that cools the stator 3 on the radially outer side.
  • the cooling section 46 has a stator core cooling section 46a and a coil end cooling section 46b.
  • the stator core cooling portion 46 a is positioned radially outward of the stator core radially outer resin portion 41 .
  • the coil end cooling portion 46 b is located radially outside the coil end radially outer resin portion 42 .
  • the cooling portion 46 has a concave portion 48 on the radially outer side of the resin portion 4 .
  • the recesses 48 are positioned radially outward of the stator core 31 and radially outward of the coil ends 33 in the resin portion 4 . That is, the stator core cooling portion 46a positioned radially outward of the stator core radially outer resin portion 41 and the coil end cooling portion 46b positioned radially outwardly of the coil end radially outer resin portion 42 each have a recess 48.
  • the recess 48 is a groove that extends radially outward of the stator core radially outer resin portion 41 and the coil end radially outer resin portion 42 in the circumferential direction.
  • the concave portion 48 of the cooling portion 46 can increase the radially outer surface area of the resin portion 4 . Also, the resin portion 4 is in close contact with the stator 3 . That is, heat of the stator 3 can be cooled by the cooling portion 46 of the resin portion 4 having the concave portion 48 on the radially outer side.
  • a passage R is formed between the casing 5 and the recessed portion 48 of the cooling portion 46 positioned radially outwardly of the resin portion 4 .
  • the passage R is positioned radially outwardly of the stator core 31 and the coil ends 33 and extends in the circumferential direction.
  • the passage R spirally extends from one axial direction of the motor 1 to the other axial direction.
  • the depth of the concave portion 48 is the same in the circumferential direction. Further, the intervals in the axial direction of the concave portions 48 are uniform.
  • the opening width of the concave portion 48 is the same width in the circumferential direction. That is, the cross-sectional shape of the passage R is the same from one axial direction to the other axial direction of the motor 1 .
  • cold water for cooling is made to flow in the passage R. As shown in FIG.
  • the resin portion 4 contains an epoxy resin. Therefore, the resin can be brought into close contact with the radially outer side of the stator core 31 and the coil ends 33, and the strength of the resin covering the radially outer side of the stator core 31 can be ensured. In addition, since the resin portion 4 contains epoxy resin, the heat of the stator 3 can be efficiently transmitted to the cooling portion 46 . Therefore, the stator 3 can be efficiently cooled.
  • the coil end axial resin portion 43 covers the axial end of the coil end 33 of the stator 3 . Thereby, electrical insulation between the axial ends of the coil ends 33 and components located in the vicinity thereof can be ensured.
  • the coil end radially inner resin portion 44 covers the radially inner side of the coil end 33 of the stator 3 .
  • the coil ends 33 of the stator 3 and the rotor 2 can be electrically insulated by the resin portion 4 . Therefore, the distance between the coil end 33 and the rotor 2 can be made closer. Therefore, a compact and high-output motor 1 can be realized.
  • the motor 1 includes the stator 3, the rotor 2, and the resin portion 4.
  • the stator 3 has a cylindrical stator core 31 extending along its axis and a stator coil 32 wound around the stator core 31 .
  • the rotor 2 is positioned radially inside the stator core 31 and rotates with respect to the stator 3 .
  • the resin portion 4 covers at least a portion of the radially outer side of the stator core 31 .
  • the resin portion 4 has a cooling portion that cools the stator 3 on the radially outer side.
  • the resin portion 4 covering the radially outer side of the stator core 31 has the function of cooling the stator 3 . Therefore, the heat of the stator 3 can be efficiently transmitted from the stator core 31 to the cooling portion 46 of the resin portion 4 by bringing the resin portion 4 into close contact with the radially outer side of the stator core 31 . Therefore, the stator 3 can be efficiently cooled by the cooling portion 46 of the resin portion 4 .
  • the resin portion 4 has a coil end radially outer resin portion 42 that covers the radially outer side of the coil end 33 of the stator 3 .
  • the cooling portion 46 has a coil end cooling portion 46 b located radially outside the coil end radially outer resin portion 42 . Thereby, the coil ends 33 of the stator 3 can be cooled by the coil end cooling portions 46 b of the resin portion 4 .
  • the cooling portion 46 has a concave portion 48 on the radially outer side of the resin portion 4 .
  • the heat of the stator 3 can be efficiently cooled by the recesses 48 .
  • the stator 3 can be cooled more efficiently by flowing cold water for cooling through the recesses 48 .
  • the recess 48 is a groove extending in the circumferential direction.
  • the stator 3 can be cooled in the circumferential direction.
  • the stator 3 can be cooled more efficiently by flowing cold water for cooling inside the recess 48 .
  • the method for manufacturing the motor 1 includes a stator forming process, a resin molding process, and a casing accommodating process.
  • stator coil 32 is wound around the stator core 31 .
  • stator 3 having the coil ends 33 axially outside the axial end portions of the stator core 31 is formed.
  • the radially outer side of the stator 3 is molded with resin.
  • the stator 3 is positioned within the mold M.
  • the molding die M has a convex portion Ma for forming the concave portion 48 of the cooling portion 46 on the radially outer side of the resin portion 4 .
  • Resin is injected into the molding die M with the stator 3 positioned therein.
  • the stator 3 is molded with resin, and the recessed portion 48 of the cooling portion 46 is formed radially outside the resin portion 4 . That is, the resin part 4 having the cooling part 46 on the radially outer side is formed by the resin molding process.
  • the resin-molded stator 3 is housed in the casing 5 .
  • the radially outer side of the resin portion 4 contacts the inner surface of the casing 5 . Therefore, the passage R is formed by the recess located radially outside of the resin portion 4 and the inner surface of the casing 5 .
  • the method for manufacturing the motor 1 according to the present embodiment includes a stator forming step for forming the stator 3, and molding of at least a part of the radially outer side of the stator 3 with a resin to form the cooling portion 46 on the radially outer side. a resin molding step of forming the resin portion 4 having the resin portion 4; and a casing housing step of housing the stator 3 molded with the resin in the casing.
  • FIG. 3 is a diagram showing the motor 101 according to a modification of the first embodiment.
  • a motor 101 according to this modification differs in the configuration of a recess 148 from the configuration of the recess 48 in the motor 1 of the first embodiment.
  • Other configurations are the same as those of the first embodiment.
  • symbol is attached
  • the motor 101 includes a rotor 2, a stator 3, a resin portion 104, and a casing 5.
  • the resin portion 104 includes a stator core radially outer resin portion 141, a coil end radially outer resin portion 142, a coil end axial resin portion 43, and a coil end radially inner resin portion 44.
  • the stator core radially outer resin portion 141 covers the radially outer side of the stator core 31 of the stator 3 .
  • the coil end radially outer resin portion 142 covers the radially outer side of the coil end 33 of the stator 3 .
  • the resin portion 104 has a cooling portion 146 on the radially outer side.
  • the cooling section 146 has a stator core cooling section 146a and a coil end cooling section 146b.
  • the stator core cooling portion 146 a is positioned radially outward of the stator core radially outer resin portion 141 .
  • the coil end cooling portion 146 b is located radially outside the coil end radially outer resin portion 142 .
  • the cooling portion 146 has a concave portion 148 on the radially outer side of the resin portion 104 .
  • the recessed portions 148 are composed of a first recessed portion 148 a located radially outward of the stator core 31 in the resin portion 104 and a second recessed portion located radially outward of the coil end 33 of the stator 3 in the resin portion 104 . 148b and .
  • the depth of the second recess 148b is greater than the depth of the first recess 148a. That is, in the present embodiment, the position of the bottom surface of the second recess 148b of the cooling portion 146 is closer to the coil end 33 than the position of the bottom surface of the radially outer recess 48 of the coil end 33 of the first embodiment. As a result, the coil ends 33 can be cooled more efficiently than when the recesses located outside the stator core 31 and the recesses located outside the coil ends 33 have the same depth.
  • FIG. 4 is a diagram showing the motor 201 according to the second embodiment.
  • Motor 201 includes rotor 2 , stator 3 , resin portion 204 , casing 5 and metal member 206 .
  • the motor 201 includes a metal member 206 inside or radially outside the resin portion 204 .
  • Other configurations are the same as those of the first embodiment.
  • symbol is attached
  • the resin portion 204 has a cooling portion 46 on the radially outer side.
  • the metal member 206 is a metal member.
  • the metal member 206 has a cylindrical shape extending in the axial direction of the motor 201 .
  • Metal member 206 is positioned inside resin portion 204 . Specifically, in the radial direction of the stator 3, the metal member 206 is positioned radially outward of the stator core 31 in the resin portion 204 and inward of the bottom surface of the recess 48, and extends in the axial direction. That is, the metal member 206 surrounds the stator 3 radially outward.
  • the metal member 206 can be embedded inside the resin portion 204 in the process of molding the stator 3, for example. By positioning the metal member 206 inside the resin portion 204, the strength of the resin portion 204 can be improved, and the heat transfer rate of the resin portion 204 can be improved, so that the stator 3 can be cooled more efficiently by the resin portion 204. can.
  • the resin portions 4, 104, 204 are composed of the stator core radial direction outer resin portions 41, 141, the coil end radial direction outer resin portions 42, 142, the coil end axial direction resin portion 43, the coil end diameter and a direction inner resin portion 44 .
  • the resin portion may not have the coil end radially outer resin portion.
  • the resin portion may not have the coil end axial resin portion.
  • the resin portion may not have the coil end radially inner resin portion.
  • the resin portion may cover at least a portion of the radially outer side of the stator core 31 .
  • stator core radially outer resin portions 41, 141, the coil end radially outer resin portions 42, 142, the coil end axial direction resin portion 43, and the coil end radially inner resin portions of the resin portions 4, 104, 204 44 is integral.
  • stator core radially outer resin portion, the coil end radially outer resin portion, the coil end axial resin portion, and the coil end radially inner resin portion may not be integrated.
  • the recesses 48, 148 of the cooling portions 46, 146 are grooves extending in the circumferential direction.
  • the recess need not extend circumferentially.
  • the recess may be a plurality of holes positioned radially outwardly of the resin portion.
  • the radially outer surface of the resin portion may have an uneven shape. Thereby, the surface area of the radially outer side of the resin portion can be increased. Therefore, the heat of the stator can be efficiently cooled.
  • cold water for cooling is made to flow in the concave portions 48 and 148 of the cooling portions 46 and 146 .
  • other liquids such as oil for cooling may be flowed into the recess.
  • a gas may be flowed into the recess.
  • the axial intervals of the recesses 48, 148 in the cooling portions 46, 146 are uniform. Also, the opening widths of the recesses 48 and 148 are the same in the circumferential direction. However, the axial spacing of the recesses may not be uniform. The opening width of the recess may not be the same width in the circumferential direction.
  • the cooling portion 46 includes the stator core cooling portion 46 a located radially outside the stator core radially outer resin portion 41 and the coil end cooling portion 46 a located radially outside the coil end radially outside resin portion 42 . and a cooling portion 46b.
  • the cooling section may not have the coil end cooling section.
  • the entire radially outer side of the resin portions 4 , 104 , 204 is in contact with the inner surface of the casing 5 .
  • a part of the radially outer side of the resin portion may be in contact with the inner surface of the casing.
  • the stator core 31 having at least a portion of the radially outer side covered with the resin portion can be held with respect to the casing.
  • the metal member 206 has a cylindrical shape extending in the axial direction of the motor 201 and surrounds the stator core 31 radially outward.
  • the metal member may have a shape surrounding part of the stator core.
  • the metal member may be a plurality of metal pieces extending in the axial direction of the motor.
  • the present invention can be used for motors.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

Ce moteur comprend : un stator ayant un noyau de stator cylindrique s'étendant le long d'un axe et une bobine de stator enroulée autour du noyau de stator ; un rotor qui est positionné radialement vers l'intérieur du noyau de stator et tourne par rapport au stator ; et une partie en résine recouvrant au moins une partie radialement vers l'extérieur du noyau de stator. La partie en résine présente, sur le côté radialement vers l'extérieur, une partie de refroidissement qui refroidit le stator.
PCT/JP2022/019743 2021-08-06 2022-05-10 Moteur et procédé de fabrication de moteur WO2023013197A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202290000300.8U CN220605696U (zh) 2021-08-06 2022-05-10 马达
JP2023539655A JPWO2023013197A1 (fr) 2021-08-06 2022-05-10

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-130188 2021-08-06
JP2021130188 2021-08-06

Publications (1)

Publication Number Publication Date
WO2023013197A1 true WO2023013197A1 (fr) 2023-02-09

Family

ID=85154052

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/019743 WO2023013197A1 (fr) 2021-08-06 2022-05-10 Moteur et procédé de fabrication de moteur

Country Status (4)

Country Link
JP (1) JPWO2023013197A1 (fr)
CN (1) CN220605696U (fr)
DE (1) DE202022002910U1 (fr)
WO (1) WO2023013197A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0898441A (ja) * 1994-09-20 1996-04-12 Fujitsu General Ltd モールドモータ
JP2008193821A (ja) * 2007-02-06 2008-08-21 Tamagawa Seiki Co Ltd ステータ構造
JP2015116113A (ja) * 2013-12-16 2015-06-22 ファナック株式会社 ターボブロア駆動用電動機
JP2019134567A (ja) * 2018-01-30 2019-08-08 本田技研工業株式会社 回転電機のステータ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019161899A (ja) 2018-03-14 2019-09-19 本田技研工業株式会社 回転電機の冷却システムおよび回転電機の冷却方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0898441A (ja) * 1994-09-20 1996-04-12 Fujitsu General Ltd モールドモータ
JP2008193821A (ja) * 2007-02-06 2008-08-21 Tamagawa Seiki Co Ltd ステータ構造
JP2015116113A (ja) * 2013-12-16 2015-06-22 ファナック株式会社 ターボブロア駆動用電動機
JP2019134567A (ja) * 2018-01-30 2019-08-08 本田技研工業株式会社 回転電機のステータ

Also Published As

Publication number Publication date
CN220605696U (zh) 2024-03-15
JPWO2023013197A1 (fr) 2023-02-09
DE202022002910U1 (de) 2023-12-14

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