Inductive proximity switch means and method

Details Inductive proximity switch means and method Inductive proximity switch means and method

1990-09-20

1992-09-15

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420711, 32420715, 32420716, 32420713, 324654, G01B 714

Patent

active

051481073

ABSTRACT:
A proximity switch including an inductor having an actuator rod movable in proximity thereto to affect the inductance thereof. An electrical pulse of relatively short duration is applied to the inductor and the current from the inductor is measured at a selected time interval after the initiation of the pulse. When a selected value of the current is exceeded, the switch is triggered. A plurality of inductors may be sequentially interrogated by one electronic circuit, thus requiring low power and affording smooth operation. Calibration of the trigger point is accomplished electronically after mechanical installation, thus inherently compensating for mechanical tolerances and proximity effects.

REFERENCES:
patent: 4130183 (1978-12-01), Tjo
patent: 4219740 (1980-08-01), Little
patent: 4560929 (1985-12-01), Melnyk
patent: 4587486 (1986-05-01), Soyck
patent: 4647892 (1987-03-01), Hewitt
patent: 4649341 (1987-03-01), Ulbrich et al.
patent: 4701676 (1987-10-01), Gibson

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