Electromagnetic load-compensation weighing apparatus including t

Details Electromagnetic load-compensation weighing apparatus including t Electromagnetic load-compensation weighing apparatus including t

1987-03-03

1988-03-15

Miller, Jr., George H.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

G01G 700

Patent

active

047306831

ABSTRACT:
Weighing apparatus of the electromagnetic load compensation type is provided with a movable coil arranged in the air gap of a permanent magnet system, and which includes a load-compensation winding through which flows a load-dependent compensation current. As a temperature sensor for measuring the coil temperature, use is made of the coil, specifically, either the load winding itself or an additional winding that is in thermal contact with it. A resistance measuring device determines its temperature-dependent resistance from the voltage and the current on or in the winding. Accurate and real-time measurement of the coil temperature as a measure for controlling the compensation of its influence on the measurement reading is possible in this way.

REFERENCES:
patent: 4134468 (1979-01-01), Luchinger et al.
patent: 4457386 (1984-07-01), Schett et al.
patent: 4489800 (1984-12-01), Nufer et al.

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