Compressor having biased controlled magnetic bearings
First Claim
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1. A magnetic bearing comprising:
- a stator including a plurality of electromagnets and configured to exert a combined electromagnetic force of the plurality of electromagnets on a drive shaft having a fluctuating load; and
a controller configured to,control a current difference between a first coil current passed through a coil of the electromagnet generating an electromagnetic force in a direction opposite to that of the load and a second coil current passed through another coil of the electromagnet generating an electromagnetic force in the same direction as that of the load to perform periodic position control on the drive shaft, andperiodically adjust the second coil current to reduce an average value of the second coil current,wherein the controller performs the periodic position control at different intervals than the periodic adjustment of the second coil current.
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Abstract
A stator is provided which exerts a combined electromagnetic force of a plurality of electromagnets on a drive shaft having a fluctuating load. A controller is provided which controls a current difference between a first coil current passed through a coil of the electromagnet generating an electromagnetic force in a direction opposite to that of the load and a second coil current passed through a coil of the electromagnet generating an electromagnetic force in the same direction as that of the load to perform a position control on the drive shaft. The controller adjusts the second coil current to reduce an average value of the second coil current.
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Citations
20 Claims
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1. A magnetic bearing comprising:
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a stator including a plurality of electromagnets and configured to exert a combined electromagnetic force of the plurality of electromagnets on a drive shaft having a fluctuating load; and a controller configured to, control a current difference between a first coil current passed through a coil of the electromagnet generating an electromagnetic force in a direction opposite to that of the load and a second coil current passed through another coil of the electromagnet generating an electromagnetic force in the same direction as that of the load to perform periodic position control on the drive shaft, and periodically adjust the second coil current to reduce an average value of the second coil current, wherein the controller performs the periodic position control at different intervals than the periodic adjustment of the second coil current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification