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Title:
APPARATUS AND METHODS FOR PASSIVE MAGNETIC REDUCTIONOF THRUST FORCE IN ROTATING MACHINES
Document Type and Number:
WIPO Patent Application WO/2015/053751
Kind Code:
A8
Abstract:
Apparatus and methods for providing a pre-determined axial thrust force profile for use in a rotating machine that includes a magnetically permeable rotor with first and second surfaces and a generally perpendicular shaft is disclosed. One or more bearings support the shaft and a coil induces flux in the rotor. First and second pole pieces disposed adjacent to the first and second surfaces define first and second gaps. A series magnetic circuit including the pole pieces, the gaps and the rotor carries flux generated by current flowing in the coil. Pole pieces and gaps provide substantially similar reluctance in both gaps. Magnetic saturation characteristics of a series magnetic circuit may provide a pre-determined axial force profile as a function of coil current. A first magnetic saturation characteristic may provide a maximum axial force at a first current magnitude. A second magnetic saturation characteristic may provide a lower axial force at a current greater than the first current. The saturation characteristic may be formed by configuring the geometry and dimensions of the poles. The axial force profile may be formed to reduce the net axial thrust load on the bearings.

Inventors:
ANDREWS, James, T. (2128 W Braker Ln, Austin, TX, 78758, US)
SCHUETZE, Karl, Thomas (2128 W Braker Ln, Austin, TX, 78758, US)
Application Number:
US2013/063849
Publication Date:
May 07, 2015
Filing Date:
October 08, 2013
Export Citation:
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Assignee:
ACTIVE POWER, INC. (2128 W. Braker Lane, Bk12Austin, TX, 78758, US)
International Classes:
H02K5/16; F16C32/04
Attorney, Agent or Firm:
HULSEY, William, N. (Hulsey, P.C. - Intellectual Property Lawyers919 Congress Ave.,Suite 91, Austin TX, 78701, US)
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