Weighing cell based on the principle of electromagnetic force compensation with optoelectronic position sensor
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United States of America Patent
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Aug 25, 2015
Grant Date -
Aug 29, 2013
app pub date -
Feb 28, 2013
filing date -
Feb 29, 2012
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Abstract
A weighing cell based on the principle of electromagnetic force compensation and having an optoelectronic position sensor that includes a light source, a light receiver, and a shutter vane. The light receiver functions to generate a position sensor signal corresponding to a deflection of the shutter vane from a zero position which occurs as a result of placing a load onto a load receiver of the weighing cell. A controller functions to regulate compensation current in response to the position sensor signal in such a way that the shutter vane and the movable parts of the weighing cell connected to the shutter vane are returned to the zero position by the electromagnetic force between a coil and permanent magnet system of the weighing cell.
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