METHOD FOR CONTROLLING INDUCTION MOTOR

摘要

PROBLEM TO BE SOLVED: To stabilize a variable speed control operation near the zero speed of an induction motor for vector-controlling by a speed sensor.

SOLUTION: A method for controlling the induction motor comprises steps of: inserting a lower limit setting means 31 to a path from a conventional primary angle frequency command arithmetic means 17 to an integrator 13 and a subtracter 20; and providing a lower limit value based on values of the rotation angle frequency command value ωR* and the slip-angle frequency ωS of the motor 2 to a primary angle frequency command value ω1* of the motor 2 by the means 31, and hence eliminating reverse drive near the zero of the primary angle frequency of the motor 2.

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