Motor-driven compressor

Patent metadata

Field	Value
Publication number	US-2016146209-A1
Application number	US-201414896686-A
Country	US
Kind code	A1
Filing date	Jul 29, 2014
Priority date	Aug 22, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A motor-driven compressor includes: a compression mechanism; an electric motor that drives the compression mechanism; a driver circuit unit disposed at a position to be cooled by refrigerant drawn by the compression mechanism; a temperature detection unit that detects a temperature of the driver circuit unit; and a motor control device disposed in the driver circuit unit to control the motor. The motor control device stores a predetermined drive pattern corresponding to a temperature characteristic of the driver circuit unit after starting the motor. When the temperature detected by the temperature detection unit at a time of starting the motor is higher than or equal to a predetermined temperature, the motor control device performs a limit drive control according to the predetermined drive pattern regardless of a drive state command to the motor.

First claim

1 . A motor-driven compressor comprising:
a compression mechanism that draws and compresses refrigerant of a refrigeration cycle; an electric motor that drives the compression mechanism; a driver circuit unit disposed at a position to be cooled by refrigerant drawn by the compression mechanism, the driver circuit unit supplying a power to the motor for driving the motor; a temperature detection unit that detects a temperature of the driver circuit unit or a relevant temperature of the temperature; and a motor control device disposed in the driver circuit unit to control a drive state of the motor based on a drive state command of the motor output from a refrigeration cycle control device that controls the refrigeration cycle, wherein the motor control device stores a predetermined drive pattern corresponding to a temperature characteristic of the driver circuit unit after starting the motor, and when the temperature detected by the temperature detection unit at a time of starting the motor is higher than or equal to a predetermined temperature, the motor control device performs a limit drive control according to the predetermined drive pattern regardless of the drive state command, and after the limit drive control is finished, the motor control device transitions to a normal drive control for driving the motor based on the drive state command.

2 . The motor-driven compressor according to claim 1 , wherein
the predetermined drive pattern is set based on a heat generation characteristic of the driver circuit unit and a cooling characteristic of the driver circuit unit caused by the refrigerant after starting the motor, and when starting the motor, the predetermined drive pattern is set to enable the limit drive control in which the motor control device drives the motor by limiting a supply power to the motor not to allow the temperature of the driver circuit unit to exceed an allowable upper limit temperature.

3 . The motor-driven compressor according to claim 1 , wherein
the predetermined drive pattern is set based on an increase in heat generation amount of the driver circuit unit caused by an increase in the supply power when transitioning from the limit drive control to the normal drive control such that the temperature of the driver circuit unit does not exceed the allowable upper limit temperature.

4 . The motor-driven compressor according to claim 3 , wherein
the predetermined drive pattern has a first period and a second period transitioned from the first period, the supply power in the second period being larger than the supply power in the first period, and the predetermined drive pattern is set based on an increase in heat generation amount of the driver circuit unit caused by an increase in the supply power when transitioning from the first period to the second period such that the temperature of the driver circuit unit does not exceed the allowable upper limit temperature.

5 . The motor-driven compressor according to claim 1 that is mounted in a vehicle.

Assignees

• Denso Corp

Inventors

• Sakai Koji

Classifications

• F04C18/344

  with vanes reciprocating with respect to the inner member · CPC title

• F04C29/0085

  Prime movers · CPC title

• F04C28/08

  characterised by varying the rotational speed · CPC title

• F04C28/06

  specially adapted for stopping, starting, idling or no-load operation · CPC title

• F04C18/0215

  where only one member is moving · CPC title