Phase shift type linear position detection device

Details Phase shift type linear position detection device Phase shift type linear position detection device

1982-02-16

1985-12-03

Groody, James J.

Communications: electrical

Continuously variable indicating

With particular transmitter

324166, 324208, G08C 1906, G01B 714

Patent

active

045568863

ABSTRACT:
About a bobbin, there are wound primary coils in axially displaced locations and wound also is a secondary coil. A core is linearly slidably provided in the bobbin. The primary coils are individually excited by AC signals which are out of phase with each other, e.g. a sine wave signal and a cosine wave signal. The secondary coil thereupon produces an output signal resulting from phase shifting the applied sine or cosine wave signal in accordance with a linear position of the core. Accordingly, the linear position can be detected by measuring phase difference between a reference AC signal and the output signal of the secondary coil. Likewise, velocity and acceleration change may be determined using the position change data.

REFERENCES:
patent: 2469137 (1949-05-01), Strong
patent: 3237189 (1966-02-01), Wayman
patent: 3242472 (1966-03-01), Anthony
patent: 4297698 (1981-10-01), Pauwels et al.
patent: 4331917 (1982-05-01), Render et al.
patent: 4355364 (1982-10-01), Gudat

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