Title:
電動機の制御装置
Document Type and Number:
Japanese Patent JP4031965
Kind Code:
B2
Abstract:
To solve the problem of a conventional controller that the circulation time of a current flowing in a resistor for current detection decreases due to reduction in the on-time of a PWM control signal and the current detection becomes difficult as a result, when the current on the DC side of an inverter is detected by a current detecting resistor without using a sensor for detection of each phase ofcurrent in performing the vector control of a motor. This controller discriminates between the case where it is possible to reproduce a motor current in two phases and the case where it is possibleto reproduce it only in one phase, in every chopper period of PWM control, and computes the percentage that the time in the case where it is possible to reproduce the motor current in two phases occupies in the specified time optionally determined, and controls the motor to switch the chopper frequency in PWM control, based on the percentage.
Inventors:
Yuhachi Takakura
Yukio Kawabata
Yukio Kawabata
Application Number:
JP2002267543A
Publication Date:
January 09, 2008
Filing Date:
September 13, 2002
Export Citation:
Assignee:
Hitachi Appliances, Inc.
International Classes:
H02P27/06; H02P6/06; H02P6/08; H02P21/00; H02P23/07; H02P25/022; H02P27/04; H02P27/08
Domestic Patent References:
| JP2001327173A | ||||
| JP2002095263A | ||||
| JP64064504A | ||||
| JP7231666A | ||||
| JP2002010668A | ||||
| JP11356081A | ||||
| JP2003189670A |
Attorney, Agent or Firm:
Manabu Inoue