Differential reactance permanent magnet position transducer

Details Differential reactance permanent magnet position transducer Differential reactance permanent magnet position transducer

1994-01-10

1995-08-22

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

310168, 318653, 32420719, 32420725, G01B 730, G01D 520, H02K 127

Patent

active

054443687

ABSTRACT:
A differential reactance permanent magnet transducer has a stator with at least two pole elements, each having an electrically conductive coil wound thereabout. The reluctances of the stator pole elements are periodically changed, in an electrically out-of-phase relationship to one another, due to the effects of permanent magnet elements moving in proximity thereto. Measurement of the reactance differentials that are thereby produced in coils mounted upon the two stator pole elements is utilized to sense the angular position of the transducer rotor. In addition to a high-resolution sensor zone and a commutation sensor zone, the transducer may include a home sensor zone to indicate a home position upon each revolution of the rotor. All of the coils employed on the stator are so arranged and electrically connected that no net back-EMF value is inductively generated from any coil as a result of movement of the rotor relative to the stator.

REFERENCES:
patent: 1929259 (1933-10-01), Rich
patent: 3501664 (1970-03-01), Veillette
patent: 3688306 (1972-08-01), Oishi et al.
patent: 4406983 (1983-09-01), Ramirez
patent: 4794511 (1988-12-01), Lundin
patent: 4924180 (1990-05-01), Nasr et al.
patent: 5140245 (1992-08-01), Stacey
patent: 5160886 (1992-11-01), Carlen

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