Title:
SPEED CONTROL SYSTEM FOR INDUCTION MOTOR
Document Type and Number:
Japanese Patent JPS5980184
Kind Code:
A
Abstract:
PURPOSE:To prevent circuit parts from being damaged in case of recovering a power interruption by providing means for detecting the power interruption and the recovery. CONSTITUTION:When a power source is recovered after a power interruption, a recovery signal is outputted from a voltage comparator 21, analog switches 11, 15, 17 are respectively recovered by the recovery signal after the prescribed period set by a timer 20, and a chopper ON/OFF pulse amplifier 19 releases the output inhibit of the ON/OFF pulse. However, since the input of an acceleration/ deceleration calculator 12 maintains the value in response to the rotating speed of a motor at the recovery time, the input deviation of a speed regulator 16 becomes zero. Accordingly, the overcurrent flowed to a transistor chopper 7 can be prevented at the recovery time.
More Like This:
| WO/1997/007589 | PROCESS AND DEVICE FOR OPERATING AN ASYNCHRONOUS MOTOR |
Inventors:
KUSUMOTO SATOSHI
Application Number:
JP18922782A
Publication Date:
May 09, 1984
Filing Date:
October 29, 1982
Export Citation:
Assignee:
FUJI ELECTRIC CO LTD
International Classes:
H02P25/26; (IPC1-7): H02P5/40
Domestic Patent References:
| JPS51137606U | 1976-11-06 | |||
| JPS5597194A | 1980-07-24 |
Attorney, Agent or Firm:
Namiki Akio