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The rotation and suspension of magnetic levitation joint rotor depends on the magnetic levitation force and electromagnetic torque produced after the joint is powered on. This paper presents an idea of differential control strategy. There is only a set of winding in upper or lower stator, and the magnetic levitation force and electromagnetic torque could be controlled by the magnitudes and phases regulating of the winding currents, then which make the motor operate stably. With MATLAB/Simunik software, the simulation of control system is made, and the results are analyzed

permanent magnet, magnetic levitation, axialelectric pump, electromagnetism design