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US 6,147,425 AGranted
Controllable magnetic bearing apparatus
AssigneeKoyo Seiko Co., Ltd.
InventorsHirochika Ueyama, Atsushi Kubo
Life of this patent
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Abstract
In the magnetic bearing apparatus, there is provided a current sensor for detecting a current flowing in a motor. When the current increases over a reference value, a DSP enhances a support stiffness of the magnetic bearing, thereby securing a stable rotation of the rotor.
Claims3
A controllable magnetic bearing apparatus comprising:
- a motor for rotating a rotor;
- a magnetic bearing for supporting said rotor in a non-contact manner;
- a displacement sensor for detecting a displacement of said rotor;
- a current sensor for detecting a current supplied to said motor;
- and
- a controller for controlling said magnetic bearing in response to an output of said displacement sensor to perform position control for said rotor and controlling said magnetic bearing in response to an output of said current sensor to vary a support stiffness for said rotor.
3 more elements
Dependencies are inferred from the claim text.