Force Ripple Suppression Strategy For PMLSM Based On Iterative Learning Control

Now, PMLSM have been widely applied to vertical transportation systems, Because it not only has high efficiency, energy saving and relatively simple structure, etc., and their running distance and running speed unfettered, so it has great theoretical research value and application prospect. However, because PMLSM haven’t middle rotating device, PMLSM in the actual operation will not inevitably be influenced by internal and external, it caused produce thrust fluctuations during operation, the stability of the lifting system is greatly affected, Therefore, the control strategy should be adopted promptly to suppress thrust fluctuation, If the motor is out-of-step in operation, the mover and the cage are dropped down quickly by gravity, which causes severe accidents. Therefore, to take effective and accurate detection means, to monitor the real-time operation of the motor, and to use effective control strategy and methods for the steady and safe operation of PMLSM with multi-segment primary driven lifting system has great significance.In the paper, Permanent Magnet Linear Synchronous Motor with multi-segment primary(PMLSM) driven lifting system is oriented, it focuses on the analysis of the cause of thrust fluctuation, the control parameter detection method is proposed, the fluctuation of thrust suppress control strategy is developed. Based on the analysis of the basic structure and operating principle of PMLSM with multi-segment primary driven lifting system, we establish its thrust angle characteristic, the mover position angle measurement strategy of PMLSM is proposed based on high frequency injection method and the additional high-frequency windings of mover. On the basis of fuzzy PID control, Force ripple suppression strategy for PMLSM based on iterative learning control is established based on the change of power angle, this dual control strategy can make the control effect more perfect.The thrust fluctuation and control system simulation model is established and simulated under the software of MATLAB / SIMULINK. The results of simulation and experiment were provided to demonstrate that this novel control strategy could suppress thrust fluctuation and keep PMLSM maintaining stable operation.We make thrust fluctuation suppression control strategy to experiment using the devices of the horizontal-moving PMLSM experimental devices with load 1500 kg, 10 m. The results of the experiments demonstrate that both two control strategies have better control quality.