Displacement sensors and sensorless operation
Akira Chiba
In active magnetic suspension, displacement sensors are necessary to detect the radial (and sometimes axial) movement of the suspended object. Reducing the cost of the sensor is important in developing a bearingless drive since these can be expensive. Hence practical problems and solutions concerning sensor development are described in this chapter. The requirements for a displacement sensor can be summarized as follows:
(a) Wide frequency response – The frequency response bandwidth should be high enough so that the phase margin of the magnetic suspension loops does not need to be decreased. For example, if the cross-over frequency of a magnetic suspension loop is 100 Hz then the ...
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