Variable-speed control device used with induction motor together

Application Number: 00108595
Application Date: 2000.05.18
Publication Number: 1274987
Publication Date: 2000.11.29
Priority Information: 1999/5/21 JP 141408/1999
International: H02P21/00
Applicant(s) Name: Fuji Electric Co., Ltd.
Inventor(s) Name: Tashima Koichi;Ishii Arakazu;Amata Hidetosni
Patent Agency Code: 11038
Patent Agent: wang maohua
Abstract This variable speed controller consists of a voltage command value computing circuit, an integrator computing a phase angle command value from a primary angular frequency command value, and a power conversion circuit for conducting power conversion according to an alternating voltage command value vector, based on an alternating voltage command value and a phase angle command value. The device is provided with a current detector, an inductive voltage computing circuit, a displacement computing circuit, and a compensator. Setting the displacement of coordinate axes between the variable speed controller and the induction motor to be zero, thereby the efficiency of a motor can be improved.