SENSOR-LESS CONTROLLING METHOD FOR AC MOTOR

摘要

The present invention relates to a sensor-less control method for an AC motor. According to the present invention, the sensor-less control method for an AC motor includes a step for injecting the square wave voltage of a switching frequency; a step for obtaining a synchronous reference frame current; a step for calculating the synchronous reference frame current; a step for changing a coordination system; a step for extracting a radio frequency component current; and a step for outputting an estimated velocity and an estimated location. [Reference numerals] (110) Current controller;(120) Envelope detector;(130) Status filter;(150) PWM inverter;(160) AC motor