Speed Fluctuation Mitigation Control for Variable Flux Memory Machine During Magnetization State Manipulations

This article focuses on the dynamic performance improvement of variable flux memory machine (VFMM), particularly the speed fluctuation mitigation control during magnetization state (MS) manipulations. A model-compensation linear active disturbance rejection (LADR-MC) speed controller is proposed for VFMM speed regulation systems to compensate for the drastic disturbance during MS manipulation and to reduce both the torque and speed fluctuations. An extended state observer (ESO) is employed to provide real-time estimation of disturbances in a lumped term. Additionally, the machine parameters during MS manipulations are identified in advance and utilized in real time to improve the accuracy of disturbance estimation for the ESO. Then, the design procedure of the LADR-MC controller is explained in detail with formulas and diagrams. Finally, the effectiveness and feasibility of the proposed LADR-MC speed controller are verified by experimental results on a hybrid-magnetic-circuit VFMM prototype. The drive system employing the LADR-MC speed controller exhibits better performance in speed fluctuation mitigation compared with those based on the conventional proportional-integral and LADR controllers.