The feasibility of a non contact sensor is investigated. This type of sensor can potentially be used for torque measurement in a speed variable\npower transmission system. Torque can be read by examining the phase difference between two induction signals from\nrespective magnetic sensors that detect the magnetic field intensity of permanent magnets mounted on the surface of a shaft in\nrotation. A real-time measuring algorithm that includes filtering and calibration is adopted to measure the torque magnitude. It is\nshown that this new torque sensor can perform well under rotation speeds ranging from 300 rpm to 500 rpm. As an interim report\nrather than a complete development, this work demonstrates the feasibility of non contact torque measurement by monitoring a\nmagnetic field. The result shows an error of less than 2% within the full test range, which is a sufficient competitive performance\nfor commercial sensors. The price is very low compared to competitors in the marketplace, and the device does not require special\nhandling of the shaft of the surface.
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