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An analytical model to describe the effects of an external DC magnetic field on the harmonics amplitude of the secondary voltages of a Linear Variable Differential Transformer LVDT is proposed. A very general approach is used based on the introduction of the equivalent differential permeability concept that takes into account the sensor's geometry as well as the magnetic properties of its materials...
The sensitivity of linear variable differential transformer (LVDT) position sensors to external slowly varying magnetic fields represents a critical issue when these sensors are installed close to high-current cables or electrical motors with significant fringe fields. The resulting position error can reach several hundreds of micrometers against a specified uncertainty normally below a few micrometers...
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