A sensorless speed control of an interior permanent magnet synchronous motor based on an instantaneous reactive power and a fuzzy logic controller

A new speed sensorless control based on an instantaneous reactive power and a fuzzy controller are proposed for the interior permanent magnet synchronous motor (IPMSM) drives. The conventional fixed gain PI and PID controllers are very sensitive to step change of command speed, parameter variations and load disturbance. Also, to the estimated speeds are compensated by using an instantaneous reactive power in synchronously rotating reference frame. In a fuzzy logic controller (FLC), the system control parameters are adjusted by a fuzzy rule based system, which is a logical model of the human behavior for process control. The effectiveness of algorithm is confirmed by the experiments.