CONTROL DEVICE OF INDUCTION MOTOR

摘要

PROBLEM TO BE SOLVED: To reduce the error between the secondary magnetic flux inside an induction motor and that calculated in a control device even if a primary resistance fluctuates.

SOLUTION: An axial deviation compensator 300 calculates a primary frequency compensation value P23 for compensating a primary frequency command value P11 so that the direction of a vector comprising an excitation current PI calculation output value P21 and a torque current PI calculation output value P22 approaches the direction of a primary current vector. An adder 63 calculates a primary frequency command value P24 by adding the primary frequency command value P11 calculated by a primary frequency calculation means 160 of slip frequency to the primary frequency compensation value P23 calculated by the axial deviation compensator 300.

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