Motor

Patent metadata

Field	Value
Publication number	US-2024388183-A1
Application number	US-202418651708-A
Country	US
Kind code	A1
Filing date	May 1, 2024
Priority date	May 15, 2023
Publication date	Nov 21, 2024
Grant date	—

Abstract

A motor includes a cylindrical stator and a cylindrical rotor rotatably provided in the stator coaxially with the center axis of the stator and is used to drive wheels of a vehicle with rotation of the rotor. The rotor includes a cage including a single short-circuit ring formed in a ring shape and a plurality of secondary conductors. First end portions and second end portions of the secondary conductors are respectively connected to positions separated in the circumferential direction in the single short-circuit ring.

First claim

1 . A motor comprising:
a cylindrical stator; and a cylindrical rotor rotatably provided in the stator coaxially with a center axis of the stator, the motor driving driving wheels of a vehicle with rotation of the rotor, wherein the rotor includes a cage including a single short-circuit ring formed in a ring shape and a plurality of secondary conductors, and first end portions and second end portions of the secondary conductors are respectively connected to positions separated in a circumferential direction in the single short-circuit ring.

2 . The motor according to claim 1 , wherein
the plurality of secondary conductors include a first secondary conductor and a second secondary conductor, and a first end portion of the second secondary conductor is between a first end portion and a second end portion in the circumferential direction in the first secondary conductor.

3 . The motor according to claim 2 , wherein the plurality of secondary conductors are formed in a U shape.

4 . The motor according to claim 2 , further comprising a first insulating film section including an insulative film on outer surfaces of the plurality of secondary conductors.

5 . The motor according to claim 4 , wherein the first insulating film section is not provided in connecting portions to the single short-circuit ring in the plurality of secondary conductors.

6 . The motor according to claim 2 , further comprising a second insulating film section including an insulative film on an outer surface of the single short-circuit ring.

7 . The motor according to claim 2 , further comprising
a plurality of insertion holes in the circumferential direction in the single short-circuit ring, and the first end portions and the second end portions of the secondary conductors are bonded to the single short-circuit ring in a state in which the first end portions and the second end portions are inserted into the plurality of insertion holes.

8 . The motor according to claim 1 , wherein the plurality of secondary conductors are formed in a U shape.

9 . The motor according to claim 1 , further comprising a first insulating film section including an insulative film on outer surfaces of the plurality of secondary conductors.

10 . The motor according to claim 9 , wherein the first insulating film section is not in connecting portions to the single short-circuit ring in the plurality of secondary conductors.

11 . The motor according to claim 1 , further comprising a second insulating film section including an insulative film on an outer surface of the single short-circuit ring.

12 . The motor according to claim 1 , further comprising
a plurality of insertion holes in the circumferential direction in the single short-circuit ring, and the first end portions and the second end portions of the secondary conductors are bonded to the single short-circuit ring in a state in which the first end portions and the second end portions are inserted into the plurality of insertion holes.

13 . The motor according to claim 1 , wherein the stator includes a stator core and a plurality of primary conductors.

14 . The motor according to claim 13 , wherein a pitch between the plurality of secondary conductors is set in accordance with a pitch between magnetic poles of rotating magnetic field formed by the plurality of primary.

15 . The motor according to claim 14 , wherein the pitch between the plurality of secondary conductors is equal to the pitch between magnetic poles of rotating magnetic field formed by the plurality of primary.

16 . The motor according to claim 13 , wherein the stator core includes a plurality of slots recessed from an inner circumferential surface of the stator core 10 toward a radial-direction outer side.

17 . The motor according to claim 16 , wherein the plurality of slots includes slots of a first size, a second size, and a third size, the first size being larger than the second size and the second size being larger than the third size.

18 . The motor according to claim 16 , wherein the plurality of secondary conductors are housed in respective slots of the plurality of slots.

Assignees

• Mazda Motor

Inventors

• Yonemori Kei

Classifications

• H02J7/14

  for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle · CPC title

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title

• H02K3/38

  around winding heads, equalising connectors, or connections thereto · CPC title

• H02K3/04

  Windings characterised by the conductor shape, form or construction, e.g. with bar conductors · CPC title

• H02K17/18 Primary

  having double-cage or multiple-cage rotors · CPC title