Title:
SPEED CONTROLLING DEVICE FOR INDUCTION MOTOR
Document Type and Number:
Japanese Patent JPS5563593
Kind Code:
A
Abstract:
PURPOSE:To enable variable voltage and variable frequency to be controlled accurately in a low-speed region, by providing a voltage control system consisting of a rectifying circuit for rectification of a 3-phase power source of an inverter circuit and a low-pass filter for equalization of this rectifying circuit's outputs. CONSTITUTION:An absolute value signal from an absolute value circuit 11 which controls a peak value of 3-phase rectangular wave put out from a 3-phase ring counter 14, is corrected by a voltage controlling system consisting mainly of a rectifying circuit 6 and a low-pass filter 7, and a 3-phase rectangular wave power source voltage to be impressed on an induction motor 4 in a fixed torque characteristic region is accurately proportionated to a frequency.
Inventors:
KAWADA SHIGEKI
ISHIDA HIROSHI
ISHIDA HIROSHI
Application Number:
JP13606578A
Publication Date:
May 13, 1980
Filing Date:
November 04, 1978
Export Citation:
Assignee:
FUJITSU FANUC LTD
International Classes:
H02P27/06; (IPC1-7): H02P5/34