Electromagnetic compensating balance

Details Electromagnetic compensating balance Electromagnetic compensating balance

1975-12-15

1977-07-12

Hartary, Joseph W.

Weighing scales

Self-positioning

Electrical current generating or modifying

177212, G01G 700

Patent

active

040348199

ABSTRACT:
An electromagnetic compensating balance for the measurement of forces having a permanent magnet circuit assembly with an annular enclosed housing and with a central core defining a narrow annular air gap between a portion of the housing and core, and having a movable bobbin concentrically arranged around the core with a coil located in the air gap, the bobbin having end portions projecting above and below the housing which are connected to leaf support members for independent support of the bobbin from the magnet assembly, the upper end portions being connected to a weighing pan for weighing samples. The balance has sensing means comprising a first pair of capacitor rings located above said coil and a second pair of capacitor rings located below said bobbin connected in a manner which eliminates canting effects in said bobbin from a reference position, said sensing means generating a transducer output voltage representing an analog to displacements in the bobbin, said output voltage controlling a servo system for generating a d.c. current through the coil which activates the coil to create a compensating equilibrium force by the bobbin opposing the force of the weighing sample, the servo system having circuit means for providing an analog voltage representing current level said analog voltage controlling an analog to digital measuring circuit which operates with said servo circuit means but is independent thereto.

REFERENCES:
patent: 3133606 (1964-05-01), Thomson
patent: 3604525 (1971-09-01), Blethen
patent: 3680650 (1972-08-01), Zimmerer

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