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Mixed magnetic bearing system (MMBS) has a complex non-linear. Firstly, this paper analyzes MMBS according to the principle and a mathematical model is established. And then a sliding mode variable structure control (SMVSC) method is presented, which bases on non-linear system. Compared with the traditional PID control method, SMVSC has good stability and robustness. At the same time, it can rapidly...
A bearingless permanent magnet synchronous motor (BPMSM) is a multi-variable, nonlinear and strong-coupled system. For closed-loop control, the decoupling control of radial forces is the key of stable suspension operation of the BPMSM. Based on basic electromagnetism theory, a radial force model of a BPMSM is given. The reversibility of the model is proved and an inverse system method is developed...
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