Magnetic levitation apparatus
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United States of America Patent
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Apr 19, 2011
Grant Date -
Apr 23, 2009
app pub date -
Oct 22, 2008
filing date -
Oct 23, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An exciting voltage arithmetic portion calculates an exciting voltage of an electromagnet using a signal of a gap sensor. On the other hand, a sensorless exciting voltage arithmetic portion calculates an exciting voltage of the electromagnet using a signal of the current sensor. The exciting voltage adjusting portion adjusts a mixing ratio between an output value of an exciting voltage arithmetic portion and an output value of the sensorless exciting voltage arithmetic portion corresponding to a gap length. The excitation of the electromagnet is controlled according to an output value of the exciting voltage adjusting portion so as to reduce influences of noises on the gap sensors thereby always achieving a stable levitation control.
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