The analysis of excitation current changes in long stator linear synchronous motor of maglev

Long stator linear synchronous motor is the main drive unit of a magnetic levitation train. While a train runs, the electromagnetic fields produced by the armature current will result in the changes of the magnetic fields produced by the excitation current, and it will lead to a fluctuation of the levitation force, thus the train-running safety and stability of the train will be weakened. So, obtaining a reasonable and effective range of the excitation current is an important way to realize the safe and stable operation of a magnetic levitation train. In this paper, the linear synchronous motor model of a magnetic levitation train is built by the ANSYS software, and then the change rules of the levitation force and propulsive electromagnetic force along with the inner power factor angle are obtained. Finally, the paper provides the reasonable fields of the excitation current to guarantee the constant air gap, and it is important to keep a safe and stable operation of the magnetic levitation train.