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Adaptive Variable Bias Magnetic Bearing ControlMost magnetic bearing control schemes use a bias current with a superimposed control current to linearize the relationship between the control current and the force it delivers. With the existence of the bias current, even in no load conditions, there is always some power consumption. In aerospace applications, power consumption becomes an important concern. In response to this concern, an alternative magnetic bearing control method, called Adaptive Variable Bias Control (AVBC), has been developed and its performance examined. The AVBC operates primarily as a proportional-derivative controller with a relatively slow, bias current dependent, time-varying gain. The AVBC is shown to reduce electrical power loss, be nominally stable, and provide control performance similar to conventional bias control. Analytical, computer simulation, and experimental results are presented in this paper.
Document ID
19980197314
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Johnson, Dexter (NASA Lewis Research Center Cleveland, OH United States)
Brown, Gerald V. (NASA Lewis Research Center Cleveland, OH United States)
Inman, Daniel J. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1998
Subject Category
Mechanical Engineering
Report/Patent Number
E-11127
NASA/TM-1998-206975
NAS 1.15:206975
Meeting Information
Meeting: 1998 American Controls Conference
Location: Philadelphia, PA
Country: United States
Start Date: June 24, 1998
End Date: June 26, 1998
Sponsors: American Automatic Control Council
Funding Number(s)
PROJECT: RTOP 523-22-13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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