| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic bearing device capable of producing effects similar to those created by a magnetic flux feedback type power amplifier within a controller without the need to provide a magnetic flux sensor near an electromagnet, and without causing an increase in number of signal lines within a cable. SOLUTION: The controlling magnetic bearing device, in which a supported body is levitated and supported by a magnetic force, includes a current sensor 11 for detecting a control current output by a power amplifier 7, and a displacement sensor 10 for detecting the displacement of the supported body 1. A control current detection signal Si of the current sensor 11 and a displacement detection signal Sg of the displacement sensor 10 are input to the power amplifier 7 which passes a control current i through a solenoid coil 6, and an estimator 20 is provided for estimating, in response to the input signals, magnetic flux or magnetic flux density produced between the support side surface of an electromagnet 4 and the side of an electromagnet target 3 facing the body 1. A value estimated by the estimator 20 is fed back to the power amplifier 7.
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