Shaft position detectors with stray magnetic field compensation

Details Shaft position detectors with stray magnetic field compensation Shaft position detectors with stray magnetic field compensation

1997-06-27

2000-02-01

Patidar, Jay

Electricity: measuring and testing

Magnetic

Displacement

324225, 32420718, 32420717, 318661, G01B 730, H02K 2400

Patent

active

06020737&

ABSTRACT:
A rotary resolver having a stator housing with electromagnetic coils and a permanent magnetic rotor rotatable therein is improved to provide a resolver system with more precise angular rotor position readings. Interacting system features include a ring of soft magnetic material interposed between north and south magnetic pole structure on the rotor, which is enhanced in performance by a particular one of the soft magnetic materials RSi 24, RNi 8 and RNi 5. Adjustable compensation coil structure in the stator housing interacting with the rotor flux pattern obtains more precise angular readings in different working locations. A digital control system dynamically processes flux compensation information. Resolver units may be positioned at an end of a rotating shaft in a working position for detecting the angular rotation position of the shaft.

REFERENCES:
patent: 4150314 (1979-04-01), Zabler et al.
patent: 4206374 (1980-06-01), Goddijn
patent: 4814704 (1989-03-01), Zerrien, Jr. et al.
patent: 5327789 (1994-07-01), Nijdam

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