New wireless torque technology

Althen Sensors & Controls

Inka Krischke, 10.02.2021, 15:29

New wireless torque technology

Althen Sensors & Controls has launched a new series of non-contact torque sensors: The measurement technology of the 'TorqSense SGR510/520' sensors is based on a DNS full bridge and transmits the measurement signals with the detection of acoustic surface waves (AOW).

The 'SGR510/520' series is suitable for applications such as torque measurement, testing, feedback control of drive mechanisms and process control.

The sensors in the series have a measuring capacity of 250 % above the measuring range. This allows the peaks of a torque signal to be recorded reliably and without data loss, even when the sensors are operated close to their full rated output. Combined with a mechanical overload capacity of over 400 %, this makes the transducers a robust solution for torque measurement.

Noise and signal distortion associated with a slip ring and other analog methods of transmitting torque data are almost completely eliminated in this design through the use of inductive signal transmission, which operates without contact. According to Althen, the sensor compensates for all external forces, such as bending moments, that are unintentionally exerted on the sensor.

The bridge essentially consists of four strain gauges bonded to the shaft to be monitored, which are arranged at an angle of 45° to the axis of rotation. A microcontroller mounted on the rotor, which is driven by an inductive coil, measures the differential values in each strain gauge and transmits them digitally back to the receiver via the same coil. The measuring range of the series is 1 to 500 Nm with an accuracy of +/- 0.1 % and a resolution of +/- 0.01 % of the transducer.

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