Linear resolver utilizing plural nulled coil sets

Details Linear resolver utilizing plural nulled coil sets Linear resolver utilizing plural nulled coil sets

1988-06-08

1990-01-02

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

318661, 336 45, 34087032, 34087036, G01B 714, G08C 1906, H01F 2100

Patent

active

048915904

ABSTRACT:
A linear resolver utilizes multiple pairs of nulled coil sets arranged co-linearly for sensing the position of multiple edges of a magnetically permeable object. An excitation coil produces an alternating magnetic field which is normally weakly coupled to the nulled coil sets across a magnetic gap. As the object covers the area of the gap, the coupling between the excitation and the individual coils in a nulled coil set is increased. Each nulled coil set produces an output which varies cyclically with increasing coverage of the object. The two nulled coil sets in each pair of nulled coil sets are offset from each other so that their cyclical outputs are offset by one quarter cycle, or 90.degree. with respect to the area of coverage by the object. Detection means are provided which resolve the outputs from a pair of nulled coil sets to precisely determine the position of the object edge. Each nulled coil pair is processed separately by the detection means so that multiple edges can be detected.

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patent: 4705971 (1987-11-01), Nagasaka

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