Position sensor employing a soft magnetic core

Details Position sensor employing a soft magnetic core Position sensor employing a soft magnetic core

1991-02-07

1993-04-20

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420722, G01B 714

Patent

active

052046214

ABSTRACT:
A position sensor using a soft magnetic core and a permanent magnet for detecting linear or rotary movements of a part. In one embodiment, a differential transformer is provided with corresponding windings 3, 4 and 5, which are wound on a tubular carrier member 2. Provided inside the carrier member 2 are a saturatable core 6 with a V-shaped crosssection section and a control magnet 8 which slides on the inner surfaces. The core 6 is partially saturated on the contact surfaces, so that a virtual air gap is produced, so that the transformation ratio between the windings 3 and 4, 5 is controlled as a function of position. Other versions employ flat and/or meandering coil arrangements and, in two instances, rotational relative motion.

REFERENCES:
patent: 3641429 (1972-02-01), Cox, Jr. et al.
patent: 4639667 (1987-01-01), Andresen
patent: 4678991 (1987-07-01), Schmidt
patent: 4697144 (1987-09-01), Howbrook
patent: 4774465 (1988-09-01), Nilius

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