Magnetic bearing controller
First Claim
1. A magnetic bearing controller for supplying a controlled current to an electromagnet for levitating a rotating body at a predetermined position, said controller comprising:
- an electromagnet for generating magnetic force by said controlled current;
a power amplifier unit for supplying said controlled current to said electromagnet, said controlled current being pulse width modulated;
a signal amplifier unit for amplifying signal before inputting to said power amplifier;
a status detector unit for detecting a status of said rotating body, said rotating body being levitated by magnetic force which is generated by said electromagnet according to said controlled current; and
an eliminator unit for eliminating frequency components of frequency area which is used by said status detector unit, said eliminator unit being inserted between said signal amplifier unit and said power amplifier unit.
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Accused Products
Abstract
It is an object of the present invention to provide magnetic bearing controller which is able to levitate the controlled object stably by using controlled magnetic forces. In the magnetic bearing controller which supplies a controlled current to an electromagnet for levitating a rotating body at a predetermined position, the controller is provided with an eliminator unit for eliminating frequency components of frequency area which is used by the status detector unit. The eliminator unit is inserted between signal amplifier unit and power amplifier unit for generating controlled current.
10 Citations
4 Claims
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1. A magnetic bearing controller for supplying a controlled current to an electromagnet for levitating a rotating body at a predetermined position, said controller comprising:
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an electromagnet for generating magnetic force by said controlled current;
a power amplifier unit for supplying said controlled current to said electromagnet, said controlled current being pulse width modulated;
a signal amplifier unit for amplifying signal before inputting to said power amplifier;
a status detector unit for detecting a status of said rotating body, said rotating body being levitated by magnetic force which is generated by said electromagnet according to said controlled current; and
an eliminator unit for eliminating frequency components of frequency area which is used by said status detector unit, said eliminator unit being inserted between said signal amplifier unit and said power amplifier unit. - View Dependent Claims (2, 3, 4)
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Specification