Rotor of rotary electric machine

Patent metadata

Field	Value
Publication number	US-2016372983-A1
Application number	US-201615180538-A
Country	US
Kind code	A1
Filing date	Jun 13, 2016
Priority date	Jun 16, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

A rotor of a rotary electric machine, which is supported by a rotating shaft, includes a rotor core, and a permanent magnet embedded in the rotor core. At least one in-core cooling medium passage that leads a cooling medium supplied from an in-shaft cooling medium passage formed inside the rotating shaft to an outer peripheral end of the rotor core, and discharges the supplied cooling medium into a gap between the rotor core and a stator, is formed in the rotor core. The at least one in-core cooling medium passage includes a center cooling medium passage, a pair of inner peripheral side cooling medium passages, and an outer peripheral side cooling medium passage that is communicated with the gap. A radially outside end portion of the center cooling medium passage has a slope that extends toward a radially outer side closer to a center in the axial direction.

First claim

What is claimed is:

1 . A rotor of a rotary electric machine, which is supported by a rotating shaft, comprising:
a rotor core; and a permanent magnet embedded in the rotor core, wherein at least one in-core cooling medium passage that leads a cooling medium supplied from an in-shaft cooling medium passage formed inside the rotating shaft to an outer peripheral end of the rotor core, and discharges the supplied cooling medium into a gap between the rotor core and a stator, is formed in the rotor core; the at least one in-core cooling medium passage includes a center cooling medium passage that extends in an axial direction in a position farther toward an inner peripheral side than the permanent magnet, a pair of inner peripheral side cooling medium passages that are provided near both ends in the axial direction of the rotor core and that communicate the in-shaft cooling medium passage with the center cooling medium passage, and an outer peripheral side cooling medium passage that extends radially outward from a center in the axial direction of the center cooling medium passage and is communicated with the gap; and a radially outside end portion of the center cooling medium passage has a slope that extends toward a radially outer side closer to the center in the axial direction.

2 . The rotor according to claim 1 , wherein
the center cooling medium passage and the outer peripheral side cooling medium passage are formed on a q-axis of the rotary electric machine; and the inner peripheral side cooling medium passage includes a first cooling medium passage that extends from an inner peripheral end of the rotor in a position offset in a circumferential direction from the q-axis of the rotary electric machine, and a second cooling medium passage that extends in the circumferential direction to communicate the first cooling medium passage with the center cooling medium passage.

3 . The rotor according to claim 2 , wherein
an axial position of the first cooling medium passage and an axial position of the second cooling medium passage are different from each other.

4 . The rotor according to claim 1 , wherein
a sectional area of the center cooling medium passage is larger closer to the center in the axial direction.

5 . The rotor according to claim 1 , wherein
a sectional area of the center cooling medium passage is constant in the axial direction.

Assignees

• Toyota Motor Co Ltd

Inventors

• Okochi Toshinori

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

• H02K1/276 Primary

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title

• H02K1/2766

  having a flux concentration effect · CPC title

• H02K1/20

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