Control method of permanent magnetic bearing-free permanent magnetic synchronous motor non-radial displacement transducer

The invention discloses a control method of a permanent magnetic bearing-free synchronous motor non-radial displacement transducer, comprising the steps of: building a model reference self-adapting radial displacement evaluating module by detecting the three-phase voltage and the electric current of a torque control winding and a suspension control winding with the model reference self-adapting theory; evaluating the radial displacement * and * by the model reference self-adapting radial displacement evaluating module; respectively comparing the displacement signals* and * with the reference displacement signals X and Yof a given permanent magnetic bearing-free motor rotor; adjusting with a displacement ring PID adjustor to respectively obtain the given suspending force Fxand Fyof the x axis and the y axis; obtaining the given three phase electric current signals i2A, i2Band i2Cfor controlling the suspension by means of a suspend decoupling control algorithm; andobtaining real-time contro