Measuring apparatus with electromagnetic force compensation and

Details Measuring apparatus with electromagnetic force compensation and Measuring apparatus with electromagnetic force compensation and

1981-03-31

1982-07-27

Hartary, Joseph W.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

177210C, 318662, 361278, 361283, G01G 702

Patent

active

043412750

ABSTRACT:
An electromagnetically compensating measuring apparatus, as in force measuring or weighing devices, wherein a compensation coil is wound upon a coil form movable in the air gap of a stationary permanent magnet system having a pole plate, a capacitive position sensor is connected to detect the position of the compensation coil, and an automatic volume control amplifier is series-connected to the position sensor so as to follow it, with the output of the amplifier connected to feed the compensation coil to tend to hold it in a predetermined zero position, and wherein the coil form and the pole plate each form an electrode of the position sensor.

REFERENCES:
patent: 3786678 (1974-01-01), Kunz
patent: 4170269 (1979-10-01), Kunz

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