Study and simulation of crane lifter sensorless system based on sliding mode variable structure

Abstract

The mathematical model of crane lifter system is established based three-phase permanent magnet synchronous motor as the power source. To achieve sensorless closed-loop control of crane lifter system, speed controller is designed using sliding mode variable structure and the system lifting speed is estimated applying model reference adaptive observer. Simulation studies have shown that adaptive observer can estimate the speed of movements accurately, sliding mode variable structure speed controller can ensure that the system has good static and dynamic speed performance and strong anti-disturbance capacity of the load. © 2011 Springer-Verlag Berlin Heidelberg.