Electricity: single generator systems – Generator control – Acyclic or homopolar-type generator
Patent
1983-08-03
1985-10-29
Hickey, R. J.
Electricity: single generator systems
Generator control
Acyclic or homopolar-type generator
310178, 310266, H02K 1742, H02K 122
Patent
active
045502838
ABSTRACT:
Minaturized unipolar low power rotational speed transducers or tachometer generators are disclosed, one of which is comprised of coaxial housing and pole members of magnetic material and a permanent magnet interposed therebetween and which housing and pole member provide an annular air gap receiving the annular side wall of a rotatable cup-shaped rotor of electrically conductive material. The rotor is supported by a drivable shaft at the end of the housing corresponding to the closed end of the rotor, and a pair of brushes radially engage the rotor side wall adjacent the closed and open ends of the rotor to provide an output signal in response to driving rotation of the rotor. In a second embodiment, the inner side of one end wall of an axially narrow housing of magnetic material is provided with an annular permanent magnet disc providing a narrow air gap with the inner side of the other end wall of the housing, and a thin disc of electrically conductive material is mounted on a drive shaft supported by the end walls for the disc to be rotatable in the air gap. The rotor disc has radially inner and outer portions respectively extending radially inwardly and outwardly of the radially inner and outer extremities of the permanent magnet disc, and a pair of brushes are supported by the housing to axially engage the rotor disc along the inner and outer portions thereof. The tachometer generators are low inertia devices, have no windings and are further characterized by a low current and voltage requiring the use of an amplifier, and a ripple free output signal maximizing signal to noise ratio.
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1969 Hewlett-Packard Catalog-"Electronics for Measurement-Analysis-Computation".
Leach Robert L.
Wickens Richard L.
Hickey R. J.
Servo-Tek Products Company
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