发明授权
US4730683A Electromagnetic load-compensation weighing apparatus including temperature compensation means 失效
包括温度补偿装置的电磁负载补偿称重装置

Electromagnetic load-compensation weighing apparatus including
temperature compensation means
摘要:
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.
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