Weighing apparatus including improved permanent magnet system

Details Weighing apparatus including improved permanent magnet system Weighing apparatus including improved permanent magnet system

1981-04-20

1982-07-06

Hartary, Joseph W.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

177210EM, 177DIG5, G01G 700

Patent

active

043378382

ABSTRACT:
An improved weighing apparatus of the electromagnetic load compensation type is disclosed, characterized by the provision of a stationary permanent magnet system including two oppositely arranged pairs of spaced parallel flat magnet members that cooperate to define a common air gap. The compensation current coil, which is connected for movement with the movable load-receiving member, is of a flat annular configuration and is contained in the plane of the air gap extending between the magnet members of each pair. The magnet members of one pair are magnetized oppositely from those of the other pair, whereby the magnetic field established across the portion of the air gap between the permanent magnet members of one pair is of a direction opposite that established between the permanent magnet members of the other pair. Consequently, not only can the compensation current for a desired compensation force effect be reduced, but also, the manufacture of the permanent magnet system is greatly simplified.

REFERENCES:
patent: 3322222 (1967-05-01), Baur
patent: 4043415 (1977-08-01), Luchinger
patent: 4090575 (1978-05-01), Kunz
patent: 4099587 (1978-07-01), Kaufmann
patent: 4109738 (1978-08-01), Kunz
patent: 4245711 (1981-01-01), Kunz
patent: 4311202 (1982-01-01), Kunz

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