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Magnetic bearing system and method of controlling the same

A magnetic bearing and controller technology, applied in the field of nonlinear compensation, can solve problems such as low efficiency, energy waste, and inability to reduce nonlinear performance

Inactive Publication Date: 2014-06-11
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such bias current strategies typically fail to reduce non-linear performance during startup and shutdown
Additionally, such strategies are inefficient as two opposing actuators always require current to generate the opposing force required to move the rotor to the set point, thus wasting energy

Method used

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  • Magnetic bearing system and method of controlling the same
  • Magnetic bearing system and method of controlling the same
  • Magnetic bearing system and method of controlling the same

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Embodiment Construction

[0029] In the following description and appended claims, reference will be made to various terms which are defined below.

[0030] The singular "a", "an" and "the" include plural references unless the context clearly dictates otherwise.

[0031] "Optional" or "optionally" means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event occurs or does not occur.

[0032] Approximate language used in the specification and claims may be used to modify any quantitative representation which can be varied within permissible range without changing the basic function concerned. Accordingly, a value modified by one or more of the terms "about" and "substantially" is not to be limited to the precise value specified. In at least some cases, the approximate language may correspond to the precision of the instrument used to measure the value. Here and throughout the specification and claims, range limitations ma...

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PUM

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Abstract

The present invention provides a magnetic bearing system and methods of controlling the same. The magnetic bearing system includes a first electromagnet, a second electromagnet opposing the first electromagnet, and a rotor positioned between the first and second electromagnets. The first and second electromagnets are configured to apply a magnetic force. The system also includes a controller configured to determine a control action necessary to move the rotor to a predetermined rotor setpoint. The system further includes a nonlinear compensation device configured to calculate a first electrical current setpoint for the first electromagnet and a second electrical current setpoint for the second electromagnet to maintain a predetermined stiffness during at least one of startup, operation, and shutdown of the magnetic bearing system. The first and second electrical current setpoints are calculated based on the control action determined by the controller.

Description

technical field [0001] The embodiments described in this specification generally relate to a magnetic bearing (Magnetic bearing) system, and specifically relate to a nonlinear compensation of a magnetic bearing system. Background technique [0002] Active magnetic bearing systems are used in rotating machinery systems to provide non-contact support of rotating parts within the machinery system. The non-contact nature of active magnetic bearings reduces rotational drag on the rotor and reduces wear on the rotating system, increasing the efficiency and life of rotating system components. [0003] At least some known active magnetic bearing systems include at least one pair of actuators or electromagnets, a position sensor, and a controller. The position sensor detects the position of the rotor relative to the actuator or the actual air gap distance. The air gap distance is transmitted as a signal to a controller which compares the actual air gap distance to a preferred air g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/04
CPCF16C32/0451H02K7/09F16C32/0442
Inventor L.C.卡默
Owner GENERAL ELECTRIC CO