POSITION MEASURING APPARATUS AND METHOD FOR OPERATING THE POSITION MEASURING APPARATUS
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United States of America Patent
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Issued Date -
Mar 16, 2017
app pub date -
Feb 18, 2014
filing date -
Feb 18, 2014
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Abstract
A position measuring apparatus measures the position(s) of an electrically conductive measurement object which can be moved over a measurement section, along which coils are positioned. A measuring coil is provided between every two excitation coils, through each of which excitation coils an alternating excitation current flows, which current is predefined to be in phase opposition from excitation coil to excitation coil. The alternating magnetic fields produced by the alternating excitation currents induce eddy currents in the electrically conductive measurement object when the measurement object moves past the excitation coils. The measuring coils provide an AC measurement voltage which is induced by the eddy currents flowing in the measurement object when the measurement object moves past the at least one measuring coil. The position of the measurement object is determined on the basis of the at least one AC measurement voltage.
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