GAP SELF-SENSING ELECTROMAGNETIC SUSPENSION SYSTEM BASED ON COMPOSITE COIL, AND CONTROL METHOD THEREFOR

The present invention relates to the technical field of electromagnetic suspension. Provided are a gap self-sensing electromagnetic suspension system based on a composite coil, and a control method therefor. The system comprises a suspension electromagnet, a signal drive module, a gap signal demodulation module, a suspension controller, a chopper and a current processing module. According to the present invention, alternating current excitation is applied to a composite coil by using a signal drive module, such that the system can obtain a suspension gap on the basis of current information detected at the composite coil, and there is no need to introduce a gap sensor any more, thereby greatly improving the system reliability and reducing the system cost. Moreover, a feedback link for detection current is added to a control link, such that the system can solve, on the basis of the detected current information and a real-time suspension gap value, the adjustment amount of the winding current of a suspension ele