| On the basis of analyzing the principles of Active Magnetic Bearing (AMB), a mathematic model of single degree-of-freedom (DOF) AMB system is established, in which mechanics equations and electrics equations are included. Then the transfer-function and the frame-figure of the system are deduced. The importance of the dissertation is to discuss the power amplifiers for AMB. At first the switching power amplifiers of the discrete components are researched and some application circuits for AMB power amplifiers are developed. Secondly the integrated power amplifier is discussed, a new type of pulse width modulation (PWM) power amplifier applying SA60 is designed and used in AMB system. In the end of the dissertation several synthesized tuning measures and some experimental results for AMB system are presented.
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