Rotating electric machine

Patent metadata

Field	Value
Publication number	US-2024322624-A1
Application number	US-202218578273-A
Country	US
Kind code	A1
Filing date	Feb 8, 2022
Priority date	Jul 26, 2021
Publication date	Sep 26, 2024
Grant date	—

Abstract

A rotating electric machine includes a shaft connected to a rotor, and a facing member fixed to the shaft and facing an end surface of the rotor via a space. The shaft includes an inner flow path through which a refrigerant flows, and a communication hole that allows the inner flow path to communicate with the space. The facing member includes first blade portions arranged along a circumferential direction. The first blade portion has a first inclined surface inclined with respect to a radial direction such that a distance to the end surface becomes shorter from the inner side in the radial direction toward the outer side in the radial direction. The first inclined surface comes into contact with a refrigerant sprayed from the inner flow path through the communication hole by rotation of the shaft, and sprays the refrigerant toward a coil end.

First claim

1 . A rotating electric machine comprising:
a stator including a stator core and a coil mounted on the stator core; a rotor arranged with the stator with a gap interposed therebetween; a shaft connected to the rotor; and a facing member fixed to the shaft and facing an end surface in an axial direction of the rotor with a space interposed therebetween, wherein the shaft includes
an inner flow path through which a refrigerant flows, and
a communication hole that allows the inner flow path to communicate with the space,
the facing member includes a plurality of first blade portions arranged along a circumferential direction of the rotor, the first blade portion has a first inclined surface inclined with respect to a radial direction of the rotor such that a distance to the end surface of the rotor becomes shorter from an inner side in the radial direction toward an outer side in the radial direction of the rotor, and the first inclined surface comes into contact with a refrigerant sprayed from the inner flow path through the communication hole by rotation of the shaft, and sprays the refrigerant toward a coil end of the coil.

2 . The rotating electric machine according to claim 1 , wherein the first inclined sprays an atomized refrigerant toward the coil end by rotation of the facing member.

3 . The rotating electric machine according to claim 1 , wherein the first blade portion is formed such that a refrigerant sprayed from the first inclined surface by rotation of the facing member comes into contact with a range from an inner peripheral side end portion to an outer peripheral side end portion of the coil end.

4 . The rotating electric machine according to claim 1 , wherein the first inclined surface has a shorter distance from the end surface of the rotor as it goes from one side toward another side in the circumferential direction.

5 . The rotating electric machine according to claim 1 , wherein
the facing member includes a disc portion having a disc shape and the first blade portion protruding from the disc portion toward the end surface of the rotor, and the communication hole sprays a refrigerant to a space between the first blade portion and the shaft in the disc portion.

6 . The rotating electric machine according to claim 5 , wherein
the first blade portion includes
a first end point located further on an inner side in the radial direction than an outer peripheral surface of the disc portion,
a second end point located on an outer peripheral surface of the disc portion,
a third end point located on an outer peripheral surface of the disc portion,
a long side connecting the first end point and the second end point,
a short side connecting the first end point and the third end point,
a first side surface connecting the long side and the first inclined surface, and
a second side surface connecting the short side and the first inclined surface,
the long side is longer than the short side, and a sum of lengths of the long sides of the plurality of first blade portions provided in the facing member is longer than a length of an outer periphery of the facing member.

7 . The rotating electric machine according to claim 6 , wherein a refrigerant flow path that tapers more as it goes from an inner side in the radial direction toward an outer side in the radial direction of the rotor is formed between the first blade portions adjacent in the circumferential direction.

8 . The rotating electric machine according to claim 6 , wherein
a plurality of the communication holes are formed along the circumferential direction of the shaft, and the communication hole includes a refrigerant inlet formed on an inner peripheral surface of the shaft and a refrigerant outlet formed on an outer peripheral surface of the shaft, and is inclined with respect to the radial direction of the shaft such that the refrigerant outlet is arranged at a position closer to the disc portion of the facing member than the refrigerant inlet.

9 . The rotating electric machine according to claim 1 , wherein
the facing member includes a second blade portion protruding toward the end surface of the rotor further on an inner side in the radial direction of the rotor than the first blade portion, the second blade portion is provided along the circumferential direction, the second blade portion has a second inclined surface inclined with respect to the radial direction of the rotor such that a distance to the end surface of the rotor becomes shorter from an inner side in the radial direction toward an outer side in the radial direction of the rotor, and a shortest distance in the axial direction from the second inclined surface to the end surface of the rotor is longer than a shortest distance in the axial direction from the first inclined surface to the end surface of the rotor.

10 . The rotating electric machine according to claim 9 , wherein
the facing member includes a disc portion having a disc shape, the first blade portion protruding from an end surface of the disc portion toward the end surface of the rotor, and the second blade portion protruding from the end surface of the disc portion toward the end surface of the rotor, a plurality of the second blade portions are formed along the circumferential direction, and have an arc shape when viewed from the axial direction, a groove portion recessed from the end surface of the disc portion is formed between the second blade portion and the shaft, the communication hole sprays a refrigerant into the groove portion, and a discharge flow path for discharging a refrigerant in the groove portion toward the first blade portion is formed between adjacent ones of the second blade portions.

Assignees

• Hitachi Astemo Ltd

Inventors

• Takahata Ryouichi
• Aoyagi Shigehisa
• Maekawa Noriyuki
• Satou Daisuke
• IWANO Ryuuichirou

Classifications

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K1/32 Primary

  with channels or ducts for flow of cooling medium · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• H02K21/14 Primary

  with magnets rotating within the armatures · CPC title