Induction type motion sensor

Details Induction type motion sensor Induction type motion sensor

1993-08-19

1995-05-16

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68E, 310155, 324239, H02K 1100, H02K 1742, G01N 2772

Patent

active

054163722

ABSTRACT:
The sensitivity of an induction-type motion sensor having a magnetic circuit with a permanent magnet to small movements is increased by the use of a stator with a core containing a permanent magnet as a fixed part thereof. An electrical coil is wound around the stator and a pendulum-type rotor has a ferromagnetic moving element which, when the motion sensor is subjected to movement forces, passes in and out of the air gap of the stator, thereby alternating the magnetic field in the stator and inducing a current in the electrical coil.

REFERENCES:
patent: 2669669 (1954-02-01), Spaulding
patent: 3230407 (1966-01-01), Marsh, Jr.
patent: 3366874 (1963-11-01), Kuhne
patent: 3855525 (1974-12-01), Bernin
patent: 3925734 (1975-12-01), Smith
patent: 3939416 (1976-02-01), Maskery
patent: 3944923 (1976-03-01), Luteran
patent: 4008566 (1977-02-01), McClintock
patent: 4384252 (1983-05-01), Kolter
patent: 4644246 (1987-02-01), Knapen
patent: 4785242 (1988-11-01), Vaidya et al.

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