Armature position detector

Details Armature position detector Armature position detector

1979-03-16

1981-02-17

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318689, 13759617, G05B 106

Patent

active

042517621

ABSTRACT:
Apparatus is provided for sensing the actual position of an armature in an electromagnetic driver, such as a torque motor, a solenoid, or the like. An oscillator generates a relatively high frequency carrier signal, which is superimposed on a relatively low frequency command signal supplied to a drive coil. Detector coils are positioned in a magnetic circuit, and are arranged to have induced therein, signals identical in frequency to the superimposed signals. The amplitude of the induced signals varies with armature position. The high frequency induced signal is separated and demodulated to provide an output signal indicating the actual position of the armature.

REFERENCES:
patent: 2980837 (1961-04-01), Wu
patent: 3668502 (1972-06-01), Pilger
patent: 4017858 (1977-04-01), Kuipers
patent: 4019131 (1977-04-01), Yamada et al.

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