CONTROLLER FOR PERMANENT MAGNET TYPE SYNCHRONOUS MOTOR

摘要

PROBLEM TO BE SOLVED: To reduce a shock in switching the control system of a permanent magnet type synchronous motor.

SOLUTION: A controller for a permanent magnet type synchronous motor includes: a means which has a first operation mode for capturing each of the current, terminal voltage and magnetic flux of a motor as a vector and controlling the angle speed of a current command value at a speed command value and a second operation mode for controlling the motor speed at the speed command value using the magnetic pole position estimated value calculated from the motor current and the terminal voltage and the speed estimated value; a means for calculating an extended induced voltage from the motor current, terminal voltage and current command value when the first mode is switched to the second mode; a means for calculating an error in magnetic pole position estimated value from the angle of the extended induced voltage; a means for initializing the magnetic pole position estimated value while using the magnetic pole position estimated error; a means for initializing the speed estimated value while using the angle speed of the current command value; and a means for initializing the terminal voltage while using the magnetic pole estimated value, and initializing the terminal voltage command value and current command value so that current may not suddenly change.

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