퍼지제어기를 사용한 영구자석 동기전동기의 센서리스 속도제어

Sensorless Speed Control of A Permanent Magnet Synchronous Motor Using the Fuzzy Logic Controller

In recent years there has been a significant development of permanent magnet synchronous motors. Generally, a PMSM requires rotor position sensors for commutation and current control, but they increase cost and size of the motor. So in these day, sensorless speed control methods of PMSM have been studied for several environmental conditions. Many sensorless control algorithms use voltage equation and dynamic equation of mathematically modeled PMSM. Because the controller has no information about rotor position without position sensor, the controller determines the applied voltage according to the hypothetical rotor position. And the analysis shows that the difference between actual and hypothetical voltage is proportional to the angular difference between hypothetical and actual rotor position. Therefore, self-synchronization is possible by reducing the voltage difference to zero. Futhermore, this paper uses the Fuzzy Logic Controller for robust speed control of PMSM. Simulation results confirm the validity of this control algorithm.