Controller for rotary electric machine

A controller for rotary electric machine which controls a rotary electric machine which has saliency in a rotor via an inverter, the controller for rotary electric machine comprising at least one processor configured to implement:

• a current detector that detects current which flow into a winding provided in a stator of the rotary electric machine;
• an angle estimator that estimates a rotational angle of the rotor, based on current detection value;
• a current controller that calculates a driving voltage command for driving the rotary electric machine, based on the current detection value;
• a command for estimation generator that generates a voltage command for estimation;
• a voltage command calculator that calculates a voltage command by adding the voltage command for estimation to the driving voltage command on a stationary coordinate system fixed to the winding;
• a carrier generator that generates a carrier wave;
• and
• a voltage applicator that turns on and off switching devices which the inverter has and applies voltage to the winding, based on a comparison result between the voltage command and the carrier wave,
• wherein the command for estimation generator generates the voltage command for estimation of a preliminarily set one period on the stationary coordinate system fixed to the winding,
• wherein the carrier generator generates the carrier wave of the same one period as the one period of the voltage command for estimation, and
• wherein the angle estimator extracts a frequency component of the one period of the voltage command for estimation, from the current detection value, on the stationary coordinate system fixed to the winding, and estimates the rotational angle based on the frequency component.