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In the suspended permanent magnet maglev train, the permanent magnet array is used as the suspension structure, and the short stator linear induction motor is used as the traction structure. The suspension system is a self-stabilizing system. As the vertical force changes, the suspension gap and the motor air gap are changing. The change in the air gap of the motor causes the output thrust to fail to meet the requirements; at the same time, the normal force of the system will also fluctuate. The normal force is the vertical disturbance of the bogie, which has a greater impact on the dynamic posture of the bogie and needs to be adjusted. control. In this paper, the secondary magnetic field orientation strategy is adopted, the end effect parameters are introduced, and the dynamic mathematical model of the linear induction motor is established. On this basis, a constant slip vector control system based on the secondary magnetic field orientation is built; The air gap between the secondary will produce dynamic changes, and a variable air gap model of the motor is built; at the same time, according to the actual operation of the train, thrust compensation is introduced. Based on the stable normal force and thrust of the original constant slip control system, the given thrust is compensated. Value so that the output thrust meets the requirements. The simulation experiment compares the proposed control strategy with the variable air gap constant slip frequency control strategy, which verifies the effectiveness of the method under typical operating conditions.

improved constant slip vector control magnet levitation LIM