Electric control system of heavyload magnetic bearing
                                                  CHENG Weichao, XIE Zhenyu, ZHANG Yuncong, HAO Jiansheng
             (College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China）

Abstract: Aiming at the problems of small electromagnetic force and slow response (current response and electromagnetic force response) of magnetic bearing in large highspeed rotating machinery, IGBT was used as the power device. The topologies of the converter and its control methods were studied. The power amplifier and voltage adjustable high frequency switching power supply were designed and fabricated. The designed power amplifier and switching power supply were combined with the existing sensors and digital controllers of the laboratory to build a heavyduty magnetic suspension bearing electronic control system and applied to the magnetic suspension flywheel rotor test bench. The test results show that the maximum output current of the heavy magnetic suspension bearing electronic control system is 120A, and the maximum output voltage is 450V, which greatly improves the electromagnetic force and response speed of the magnetic suspension bearing, and it can ensure the stable operation of the flywheel rotor within the working speed range.

Key words: power amplifier; IGBT; switching power supply; highfrequency transform; FPGA