Further, multipoint calibration reduces any linearity errors within the sensor. Ingham explained that external noise pickup into the wiring is virtually eliminated due to the short distance between the strain gauge elements and the rotor’s measuring circuits. “Firstly, it eliminates the sort of noise pickup and signal corruption associated with slip ring and other analogue methods of transferring torque data from rotor to stator.” “This design gives the TorqSense SGR510/520 several significant advantages over conventional torque sensors,” said Mark Ingham of Sensor Technology. The SGR510/520 series transducers then use state of the art strain gauge signal conditioning techniques to provide a high bandwidth, low cost torque measuring solution with high overrange and overload capabilities Thus, when torque is applied to the shaft two gauges are stretched into tension and two go into compression.Ī rotor mounted ultra-miniature microcontroller, powered by an inductive coil, measures the differential values in each strain gauge and transmits them back to the stator digitally, via the same coil. ![]() The bridge is essentially four strain gauges glued onto the shaft that is to be monitored in a square formation set at 45 o to the axis of rotation.
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