Contactless Torque Sensor based on shaft torsion measurement, com- patible with existing shafts

The torque measurement usually comes from strain gauges bonded on a shaft. The main concern in this measurement is due to the fact that these gauges are also rotating and the integration of electronic on rotating parts is definitely a blocking point. To overcome these limitations, the architecture of our device is mainly composed of two targets, two position sensors, a proof body and a compact body. In its working principle, the angular shift between two rotary targets along the shaft is converted by the proof body into amplified axial shift between the targets. Only one sensor is required to measure the target motion. However two sensors perform a differential measurement in the stationary frame for temperature compensation. This new generation of contactless sensor has been developed and patented to capture the torque in a stationary axle or rotating shaft. The measurement is done with stationary electronic components. This unique compact structure measures torque with low-cost standard eddy current sensor..