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Rotating sensor

Measuring torque and axial forces

Manner Sensortelemetrie (Germany) has extended its range of measuring sensors with the Combination Measurement Flange. It was specifically developed for test bench technology. For data transmission, a CAN network is used.

For data transmission a CAN network is used (Photo: Manner)

IN PARTICULAR IN CARDAN SHAFT TEST BENCHES, the measurement of axial forces is a key factor in addition to dynamic torque. Axial forces and bending moments are generated at the bending angle of a cardan shaft. The axial forces have to be minimized as they put considerable strain on the bearings and cause wear. In fan, propeller, or pump test benches, the generated dynamic axial force is also an important factor in addition to torque. A combined and crosstalk-free measurement of these values presents a particular challenge.

Previous concepts only permitted the precise measurement of axial forces for large values compared to the torque. Manner has developed a sensor specifically for this task, which also achieves an accurate detection of comparatively small axial forces with the lowest crosstalk. This sensor can measure axial forces with an accuracy of 0,1 % and torque with an accuracy of 0,05 %.

The rotating sensor automatically transmits the simultaneously measured values via contactless sensor telemetry for data logging. Digital sensor telemetry improves the system accuracy. With this sensor generation, the torque and axial force values are already digitized in the rotor with 16 bits at 4000 values/sec. Optional higher sampling rates are also available.

The signal transmission range between the rotational antenna and the pick-up, as well as the design, have been proven successful in practice, says the company. For data transmission to the test bench controller, networks such as CAN, USB, Ethernet (TCP/IP), and Ethercat are used. Of course, classical analog output signals are available, too.

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Manner Sensortelemetrie