Title:
CONTROLLING METHOD OF INDUCTION MOTOR
Document Type and Number:
Japanese Patent JPS59159688
Kind Code:
A
Abstract:
PURPOSE:To control a slip frequency to an adequate value irrespective of the variation in the temperature of the secondary resistor by controlling a motor in response to the slip frequency detected from the signal of 90 deg. phase difference to the exciting current phase reference and the signal of the same phase. CONSTITUTION:A signal for instructing the instantaneous value of the output current of an inverter 1 is obtained from a current detection signal of a motor 2, a speed command signal 3 and an exciting current command signal 16, the voltage detection signal is applied to detectors 7, 8 to detect the 90 deg. phase difference component signal to the exciting current phase reference and the same phase component signal, the output of the detector 7 is butted to the signal 3, further added to the output of the detector 8, the rotating speed command signal is obtained to control the slip frequency, applied to multipliers 17, 18 to control the inverter 1. Accordingly, the slip frequency can be always controlled adequately irrespectively of the variation in the temperature of the secondary resistor of the motor 2, the speed detecting error, and the magnitude of the load torque.
Inventors:
OKUYAMA TOSHIAKI
MIKI KOUJI
KOUNO KIMIO
TACHIKAWA MAKOTO
MIKI KOUJI
KOUNO KIMIO
TACHIKAWA MAKOTO
Application Number:
JP3323683A
Publication Date:
September 10, 1984
Filing Date:
February 28, 1983
Export Citation:
Assignee:
HITACHI LTD
HITACHI ENG CO LTD
HITACHI ENG CO LTD
International Classes:
H02P21/00; H02P21/05; H02P21/08; H02P21/22; H02P23/04; H02P23/07; H02P23/08; H02P23/16; H02P27/04; H02P27/08; (IPC1-7): H02P5/34
Attorney, Agent or Firm:
Tatsuyuki Unuma