The Electro Magnetic Compatibility Analysis and Experiment of the electronic system in AMB

The helium turbine and generator system of 10MW high-temperature gas-cooled reactor (HTR-10GT) is constructed by the Institute of Nuclear and New Energy Technology (INET) at Tsinghua University of China. One of key technologies is the use of active magnetic bearings (AMB) as support member. The turbine has a special structure, thin and long rotor, speed up to 15000rpm, and have to pass a second bending critical. Since the harsh condition, the AMB system need not only precise control but also high reliability, to resist the terrible environment in the reactor. Through analysis, the reliability of the electronic system is the weakest link in AMB. And the radiation interference from bearing coil and conducted interference from the power amplifier are the main noise source. With modelling and analysis, find out the conductive interference play an important role on the electronic system, while the radiation interference can be ignore by the sensor’s special structure. According to the results, Electro Magnetic Susceptibility (EMS) tests was designed and were done on the electronic system. Unfortunately, the electronic system could not pass all the EMS testing at first time. Then, the optimization on hardware and software for electronic system are shown in the paper. It is these improvements, the system passed the EMS final test successfully, and operating in the field stably now. This article combined with theoretical analysis and practical experiment, not only demonstrates the importance of the electronic system’s reliability, but also gives effective improvement methods. It can be said has engineering significance especially for HTR- 10GT spreading.