Power electronic circuits for magnetic bearings
Akira Chiba
In magnetic suspension controllers, current or voltage commands are generated via the sensing of the displacement of a suspended object. Power electronic circuits apply voltage to the winding terminals to produce current in the windings. The rate of change of current should be fast enough to follow the current command. However, the amplitude and frequency ranges are limited by the voltage and current ratings of the power electronic circuits and the bearing winding inductances. If the current response is not fast enough, then the feedback loop becomes unstable, which results in shaft touch-down.
In this chapter, the structures and principles of power electronic circuits are explained ...
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