CONTROLLER FOR INDUCTION MOTOR

摘要

PURPOSE:To enable to obtain by high speed calculation a current command signal of a current control system from the vector calculation result without increasing the cost of an induction motor by using the integrated result of the previous cycle stored in a memory. CONSTITUTION:An inverter frequency omega1, a primary current amplitude I1 and a primary current phase theta1 obtained from the result of the vector calculation of a microprocessor are transferred to the register 75 and CREFReg 71 of a current instructing circuit 59 of a hard configuration. The instructing circuit 59 adds (SIGMAomega1+omega'1) DELTAt corresponding to integral omega1dt by an adder 76 by using the DDReg 78 storing the angle calculation result of the previous cycle, and adds (SIGMAomega1+omega'1) at next timing in a time division manner by a stage signal generated from a stage signal generator 72 and then rapidly calculates the current command signal of a current control system from the vector calculation result.