Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-08-07
1998-07-21
Stephan, Steve L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 80, 310103, 310105, H02K 709, H02K 706, H02K 4900
Patent
active
057838852
ABSTRACT:
A self-adjusting magnetic bearing automatically adjusts the parameters of an axially unstable magnetic bearing such that its force balance is maintained near the point of metastable equilibrium. Complete stabilization can be obtained with the application of weak restoring forces either from a mechanical bearing (running at near-zero load, thus with reduced wear) or from the action of residual eddy currents in a snubber bearing. In one embodiment, a torque is generated by the approach of a slotted pole to a conducting plate. The torque actuates an assembly which varies the position of a magnetic shunt to change the force exerted by the bearing. Another embodiment achieves axial stabilization by sensing vertical displacements in a suspended bearing element, and using this information in an electrical servo system. In a third embodiment, as a rotating eddy current exciter approaches a stationary bearing, it heats a thermostat which actuates an assembly to weaken the attractive force between the two bearing elements. An improved version of an electromechanical battery utilizing the designs of the various embodiments is described.
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Stephan Steve L.
The Regents of the University of California
Wallace, Jr. Michael J.
Wooldridge John P.
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