A sensorless speed control of an interior permanent magnet synchronous motor based on a fuzzy speed compensator

In this paper, a new speed sensorless control based on a fuzzy compensator is proposed for the interior permanent magnet synchronous motor (IPMSM) drives. The conventional proportional plus integrate (PI) control are very sensitive to a step change of the command speed, parameter variations and load disturbance. To settle these problems of the PI control, the estimated speeds are compensated by using the fuzzy logic controller (FLC). In the FLC used for compensating the speed error of the IPMSM, the system control parameters are adjusted by the 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.