| Summary: | 碩士 === 中正理工學院 === 電機工程研究所 === 87 === The aims of this thesis are to investigate the characteristics of rotating spindle suspended by magnetic bearings and to design the digital circuits hardware, analog circuits hardware and digital controllers. The dynamic characteristics of magnetic bearing system are suffered by many problems, such as nonlinearities, unbalances, parameter variations, and external disturbances. In order to balance the magnetic suspended bearing, position sensors and Hall current sensors are used in a PC-based system to sense the bearing’s position and the current of control coils. The position and current signals are analog types. These analog signals will be processed by A/D converters and digital PID controllers. The PC-based system then uses sliding mode concept to produce ON/OFF signals. The ON/OFF signals drive IGBTs and keep the magnetic suspended bearings under balancing condition.
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