Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1991-12-23
1993-06-15
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Linear
310 905, H02K 709, H02K 4102
Patent
active
052202224
ABSTRACT:
A magnetic field bushing has a movable member and stationary rod. The stationary rod has high permeability strips of magnetic material forming a portion of the surface. The stationary rod further includes at least two sets of coils, the magnetic field resulting from application of a current to each coil being coupled to a strip. The movable member is configured to encircle substantially the stationary rod. The movable member has regions of high permeability magnetic material which are positioned on the movable member to complete a magnetic circuit with related magnetic strips. The magnetic circuits are completed through air gaps between the movable member regions and the stationary rod strips. The magnetic field in the air gaps results in a force between the movable member regions and the stationary rod strips. Forces are generated between the movable member and the stationary rod, the forces being selected to prevent contact between the movable member and the stationary rod. By using sensors which provide a signal determined by the distance between the movable and the stationary rod to control the current in the coils, the distance the members can be maintained even in the presence of external forces. This magnetic bushing has particular application to the actuator or read/write head of an optical storage system.
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Eastman Kodak Company
Holloway William W.
LaBalle C.
Stephan Steven L.
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