Title:
DRIVE CONTROLLING SYSTEM FOR INDUCTION MOTOR
Document Type and Number:
Japanese Patent JPS5563595
Kind Code:
A
Abstract:
PURPOSE:To reduce torque ripple at the time of light load and also to enable torque to become generated immediately even at the time when load became heavier, by changing voltage to be impressed on an induction motor according to magnitude of slip. CONSTITUTION:A difference between a speed command signal put into an input terminal A and a revolving speed signal from a speedometer generator 5 is removed at a summing point 30, and the difference is amplified by an error amplifier 9. An output from this error amplifier 9 is a slip of an induction motor 4. A slip signal put out from the error amplifier 9 is deprived of an absolute value by an absolute value circuit 11'. An output, which becomes large as the slip increases but becomes small when the slip decreases, is obtained from a multiplication circuit 31. Power transistors Q1-Q6, which compose an inverter circuit 3, are controlled by being turned on and off in accordance with this output, so that the voltage to be impressed on the induction motor can be controlled.
Inventors:
KAWADA SHIGEKI
ISHIDA HIROSHI
KOIWAI YUTAKA
ISHIDA HIROSHI
KOIWAI YUTAKA
Application Number:
JP13606978A
Publication Date:
May 13, 1980
Filing Date:
November 04, 1978
Export Citation:
Assignee:
FUJITSU FANUC LTD
International Classes:
H02P27/06; H02P27/04; H02P27/08; (IPC1-7): H02P5/34