MOTOR CONTROLLER

摘要

PROBLEM TO BE SOLVED: To provide a motor controller for highly accurately extracting current components corresponding to a sensing signal, thereby enabling to stably control a motor.

SOLUTION: A current command value generating section 11 generates a current command value Idq*for generating a torque from a motor 3. A sensing signal generating section 21 generates a sinusoidal sensing signal of a predetermined sensing frequency. The sensing signal is injected into a stator of the motor 3. A response of the motor 3 to the sensing signal is detected by a current sensor 9. A subtracting section 24 subtracts a current command value Iαβ*from a detection signal Iαβto suppress the influence of the current command signal value Iαβ*, and generates a current response signal Iαβecorresponding to the sensing signal. A position estimating section 20 estimates the rotating position of the rotor based on the peak of a waveform of the current response signal Iαβe.

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