NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Magnetic bearings with zero biasA magnetic bearing operating without a bias field has supported a shaft rotating at speeds up to 12,000 rpm with the usual four power supplies and with only two. A magnetic bearing is commonly operated with a bias current equal to half of the maximum current allowable in its coils. This linearizes the relation between net force and control current and improves the force slewing rate and hence the band width. The steady bias current dissipates power, even when no force is required from the bearing. The power wasted is equal to two-thirds of the power at maximum force output. Examined here is the zero bias idea. The advantages and disadvantages are noted.
Document ID
19910011881
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Brown, Gerald V.
(NASA Lewis Research Center Cleveland, OH, United States)
Grodsinsky, Carlos M.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1991
Publication Information
Publication: NASA, Langley Research Center, Aerospace Applications of Magnetic Suspension Technology, Part 1
Subject Category
Spacecraft Design, Testing And Performance
Accession Number
91N21194
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available