Rotating Field Electrodynamic Levitation System Control

Rotating field electrodynamic levitation system (RFELS) was proposed based on theories and characteristics of existing magnetic levitation systems. It is easy to control, has simple structure, can realize intrinsic stable static levitation without mechanical shaking, loss and gyroscope effect.RFELS's control method is investigated in this thesis. First, Set up RFELS's equivalent circuit and 3-phase static mathematical model, calculated the equivalent circuit parameters by electromagnetic field energy storage distribution, derived 2-phase synchronous rotating mathematical model through coordinate system transformation. According to the model, decoupled lift force control and flux control by decoupling primary current. Designed secondary field oriented control circuit loop. Designed lift force, torque, flux, current observer and controller, and lift force, investigated secondary flux observation in flux double closed-loop control system, introduced output compensation in current controller.Introduced space vector pulse width modulation (SVPWM) into inverter design to simplify digital design, improve DC voltage utilization ratio, limit harmonic wave.According to the proposed control strategy, designed SVPWM levitation control system simulation model on Matlab/Simulink software platform, packaged some parts of the control system into subsystem to simplify the simulation model. Simulation results showed fast response, high robust, the control strategy is efficient.Designed and produced software and hardware of levitation control system based on DSP core. Built a levitation operation test platform, performed operation test on it, the results indicated that the proposed control system can drive RFELS realizing static stable levitation.