Research on Position Sensorless Method of High-Speed Maglev Long Stator Linear Synchronous Motor Based on Active Flux Observer

In this paper, a position sensorless control method for a high-speed maglev long stator linear synchronous motor with active flux observer with disturbance compensation is proposed. The non-ideal factors such as inverter nonlinearity and parameter mismatch during train operation can reduce the performance of the controller. Therefore, this paper uses the generalized integral extended state observer (GI-ESO) to observe the disturbance and compensate for it in the hybrid flux model. The traditional ESO is not enough to deal with the periodic sinusoidal disturbance of the high-speed maglev traction control system. Therefore, based on ESO, the multiple generalized integrator (GI) with selective resonant frequency is combined with ESO to track the sinusoidal disturbance. The simulation results show that the proposed sensorless control method improves the speed and position observation accuracy and control robustness compared with the existing methods.