Sensorless Control for Conveyor Collision Servo by PMSM

Abstract

With the increasing application of permanent magnet synchronous machines (PMSM), the instability of the sensor becomes an important factor that threatens the reliability of the servo system based on it. The research of the sensorless control has reached such a pitch, and the sharp change of load is one of the difficulties. This paper proposes a scheme based on the conservation of momentum to solve the problem. The rotor position is estimated by a convex optimization method during the whole process. With the help of the mechanical equation model, supplemented by the extended Kalman filter (EKF) for data fusion, the speed estimate is obtained. And the momentum conservation theorem is introduced to correct the estimation when the load changes dramatically. Finally, the technology is simulated and verified by taking conveyor as an example.