Sensorless Control Strategy for High-speed Maglev Based on a Nonlinear Flux Observer

The stable operation of a high-speed maglev train is highly dependent on the position detection system. The existing positioning sensor has the problem of a long data transmission period, which cannot meet the requirements of high-speed operation. Therefore, this paper proposes a sensorless control strategy based on a nonlinear flux linkage observer. According to the voltage equation of the long stator linear synchronous motor in the stationary frame, a nonlinear flux linkage observer is constructed to estimate the position angle of the mover. Considering that directly differentiating the estimated position will amplify the estimation error, use a tracking controller to estimate motor speed. Simulations verify the feasibility and effectiveness of the sensorless control strategy.