Abstract:  Aiming at the problem that the load fluctuation of permanent magnet outer rotor multirope friction mine hoist affects the stability of the hoist system; the control system of the hoist was studied.Firstly, the hoist structure and control theory were analyzed. According to the characteristics of its hidden pole rotor structure, the vector control strategy of id=0 was chosen. The smooth speed curve and sliding mode speed controller were proposed to optimize the stability of the hoist, and the stability of the sliding mode speed controller was judged by Lyapunov stability theorem. Then, the mechatronics simulation model of lifting system was built and studied insimulationX.Finally, the reliability of the simulation model was verified by field tests. The results show that acceleration mutation has obvious influence on hoist speed overshoot and q axis current of hoist is obviously correlated with acceleration. The speed overshoot of the hoist was reduced by 68% by using only a smooth speed curve, but the speed fluctuation caused by the load fluctuation has no obvious restraining effect. The speed overshoot of the hoist was reduced by 73% by using only the sliding mode speed controller. When using both smooth speed curve and sliding mode speed controller, the hoist speed fluctuation is reduced by 90%, and it has obvious restraining effect on load fluctuation.
Key words:  permanent magnet outer rotor hoist; vector control strategy; stability of hoist system; vector control; smooth speed curve;sliding mode speed controller;load fluctuation