Rotating electric machine

Patent metadata

Field	Value
Publication number	US-10811939-B2
Application number	US-201415505304-A
Country	US
Kind code	B2
Filing date	Oct 28, 2014
Priority date	Oct 28, 2014
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

In order to efficiently cool a stator and rotor of a rotating electrical machine, cooling oil is supplied by a pump in a pressurized state to a first reservoir portion provided in an upper portion inside a housing, and after the cooling oil is ejected from the first reservoir portion, the cooling oil is guided to a stator coil end cooling structure, and to a rotor bearing and rotor core cooling structure, using the weight of the cooling oil itself.

First claim

The invention claimed is:

1. A rotating electrical machine, comprising:
a first reservoir portion provided in an upper portion inside a housing and having a vent from which cooling oil is ejected;
a pump that supplies the cooling oil in a pressurized state to the first reservoir portion; and
a guide portion that guides the cooling oil ejected from the first reservoir portion to a stator cooling structure and a rotor cooling structure using a weight of the cooling oil itself,
wherein the rotor cooling structure comprises a second reservoir portion provided above a shaft of a rotor, the second reservoir portion storing the cooling oil ejected from the first reservoir portion, and a shaft oil path that supplies the cooling oil to the shaft of the rotor,
wherein a bearing oil path that supplies the cooling oil to a bearing of the rotor extends from a first hole in the second reservoir portion, and
wherein the shaft oil path extends from a second hole in the second reservoir portion,
wherein the cooling oil is supplied to the bearing of the rotor without passing through the second hole, and
wherein the first hole from which the bearing oil path extends is provided at a position lower than the second hole from which the shaft oil path extends.

2. The rotating electrical machine according to claim 1 , wherein the cooling oil supplied from the second reservoir portion is divided into the bearing oil path that supplies the cooling oil to the bearing of the rotor and the shaft oil path that supplies the cooling oil to the shaft of the rotor.

3. The rotating electrical machine according to claim 1 , wherein an oil path in the axial direction of rotation of the shaft and an oil path in the radial direction of the shaft are provided in communication in the shaft of the rotor.

4. The rotating electrical machine according to claim 1 , wherein the rotor cooling structure includes cooling the bearing, and the cooling oil is supplied to the bearing from the vent of the first reservoir portion.

5. The rotating electrical machine according to claim 1 , wherein the stator cooling structure includes cooling a stator coil end, and the cooling oil is supplied to the stator coil end from the vent of the first reservoir portion.

6. The rotating electrical machine according to claim 1 , wherein the first hole is provided in a part configuring the second reservoir portion, and the cooling oil is supplied to the bearing from the first hole.

7. The rotating electrical machine according to claim 2 , wherein a position from which the cooling oil is ejected by the bearing oil path is a position higher than a position from which the cooling oil is ejected by the shaft oil path.

8. The rotating electrical machine according to claim 1 , wherein a bottom surface of the second reservoir portion includes a first portion and a second portion, and wherein the first portion is positioned below the second portion.

9. The rotating electrical machine according to claim 6 , wherein a bottom surface of the second reservoir portion includes a first portion and a second portion, and wherein the first portion is positioned below the second portion.

10. The rotating electrical machine according to claim 9 , wherein the first hole is provided at the first portion of the bottom surface of the second reservoir portion.

11. The rotating electrical machine according to claim 1 , wherein the first reservoir portion comprises at least two cooling systems, a first system from among the at least two cooling systems extending to the stator and a second system from among the at least two cooling systems extending to the rotor.

Assignees

• Mitsubishi Electric Corp

Inventors

• Kitta Yoshiaki
• Ojima Koichi
• Takagi Katsunari
• Inoue Masaya
• Higashino Hiroyuki

Classifications

• H02K9/19 Primary

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

• H02K5/203

  specially adapted for liquids, e.g. cooling jackets · CPC title

• H02K5/20

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