Aiming at the problem that the response speed of the displacement control of the existing magnetic levitation motor is too slow and its overload protection is defective,a displacement control system based on the eddy current sensor was designed.Taking the MM32 single-chip microcomputer as the controller,the offset signal of the motor rotor was obtained through the eddy current sensor.After the double closed-loop PID control processing,the controller sent an electrical signal to change the output current of the control circuit to make the motor rotor return to the equilibrium position for stable operation.The experimental results show that when the motor speed changes,the control system can change the output current within 0.1 s to keep it running smoothly,and the motor stops running at a lower speed to reduce overload damage when overloaded.