Capacitor mounting arrangement in a rotary electrical machine

Patent metadata

Field	Value
Publication number	US-10840775-B2
Application number	US-201715663917-A
Country	US
Kind code	B2
Filing date	Jul 31, 2017
Priority date	Feb 17, 2017
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A rotary electrical machine for a vehicle according to the present invention is provided with a stator, a rotor which is provided facing the stator and which rotates coaxially with the stator, a power module which is connected to the stator, a capacitor which eliminates or reduces switching noise in the power module and has a pressure release valve, a circuit board on which the capacitor is mounted, and a heat sink which encompasses the capacitor, wherein a semi-closed cell foam seal material is provided in contact with the pressure release valve, and the capacitor is fixed to a terminal fixing section of the circuit board, and is also fixed to an inner side of the heat sink by an anti-vibration bond in a portion different from the terminal fixing section.

First claim

What is claimed is:

1. A rotary electrical machine for a vehicle, comprising:
a stator;
a rotor which is provided facing the stator and rotates coaxially with the stator;
a power module which is connected to the stator;
a capacitor which eliminates or reduces switching noise in the power module and has a pressure release valve;
a circuit board on which the capacitor is mounted; and
a heat sink which encompasses the capacitor,
wherein the pressure release valve is provided on an outside surface of the capacitor
wherein a semi-closed cell foam seal material is provided in contact with the pressure release valve, and
the capacitor is fixed to a terminal fixing section of the circuit board, and is also fixed to an inner side of the heat sink by an anti-vibration bond in a portion different from the terminal fixing section.

2. The rotary electrical machine for a vehicle according to claim 1 ,
wherein the pressure release valve is provided in the capacitor in a portion on the side opposite to the terminal fixing section, and
the capacitor is fixed to the inner side of the heat sink at the periphery of the pressure release valve.

3. The rotary electrical machine for a vehicle according to claim 2 , wherein the capacitor is isolated from the outside of the heat sink, by being encompassed within the heat sink.

4. The rotary electrical machine for a vehicle according to claim 2 , wherein a space is formed between the capacitor and the heat sink.

5. The rotary electrical machine for a vehicle according to claim 2 , wherein the semi-closed cell foam seal material is ring-shaped.

6. The rotary electrical machine for a vehicle according to claim 2 , wherein an air hole is formed in a portion of the heat sink that opposes the semi-closed cell foam seal material.

7. The rotary electrical machine for a vehicle according to claim 2 , wherein the anti-vibration bond has thermal conductivity.

8. The rotary electrical machine for a vehicle according to claim 1 , wherein the capacitor is isolated from the outside of the heat sink, by being encompassed within the heat sink.

9. The rotary electrical machine for a vehicle according to claim 8 , wherein a space is formed between the capacitor and the heat sink.

10. The rotary electrical machine for a vehicle according to claim 8 , wherein the semi-closed cell foam seal material is ring-shaped.

11. The rotary electrical machine for a vehicle according to claim 8 , wherein the anti-vibration bond has thermal conductivity.

12. The rotary electrical machine for a vehicle according to claim 1 , wherein a space is formed between the capacitor and the heat sink.

13. The rotary electrical machine for a vehicle according to claim 12 , wherein the semi-closed cell foam seal material is ring-shaped.

14. The rotary electrical machine for a vehicle according to claim 12 , wherein the anti-vibration bond has thermal conductivity.

15. The rotary electrical machine for a vehicle according to claim 1 , wherein an air hole is formed in a portion of the heat sink that opposes the semi-closed cell foam seal material.

16. The rotary electrical machine for a vehicle according to claim 15 , wherein the anti-vibration bond has thermal conductivity.

17. The rotary electrical machine for a vehicle according to claim 1 , wherein the anti-vibration bond has thermal conductivity.

18. A rotary electrical machine for a vehicle, comprising:
a stator;
a rotor which faces the stator and rotates coaxially with the stator;
a power module which is connected to the stator;
a capacitor which eliminates or reduces switching noise in the power module and has a pressure release valve;
a circuit board on which the capacitor is mounted; and
a heat sink which encompasses the capacitor,
wherein a semi-closed cell foam seal material is in contact with the pressure release valve, and
the capacitor is fixed to a terminal fixing section of the circuit board, and is also fixed to an inner side of the heat sink by an anti-vibration bond in a portion different from the terminal fixing section,
wherein the semi-closed cell foam seal material is ring-shaped.

19. The rotary electrical machine for a vehicle according to claim 18 , wherein the anti-vibration bond has thermal conductivity.

Assignees

• Mitsubishi Electric Corp

Inventors

• Onishi Toshiyuki
• Shimano Tomoaki
• Uno Yosuke

Classifications

• H02K19/365

  with a voltage regulator · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K2205/09

  Machines characterised by drain passages or by venting, breathing or pressure compensating means · CPC title

• H02K11/02 Primary

  for suppression of electromagnetic interference · CPC title