Wireless Torque Meter (patented)

Autec wireless torque meter uses a patented proprietary technology for energy and data transmission. The system is made up of two parts: a moving part attached to the rotating shaft with a strain gauge bridge, and a fixed part attached to the frame of the machine. The two parts are placed at short distance from each other. There are no wires connecting them. No batteries or radio equipment are mounted on the moving part. The fixed part is connected to a circuit board which provides the torque value both in analogue and digital form.

Operating principle: the fixed part powers the moving part which reads the state of the strain gauge bridge and sends the torque value back to the fixed part in Nm or Kgm at prescribed intervals. The data are then sent to a data acquisition system or to an electronic control apparatus. The torque meter can be used both when the shaft is rotating and when it is not (0 rpm). The rotation speed doesn’t have any effect on the accuracy of the meter. The data can thus be used in real time to carry out load/strain tests, to report a warning and gather useful data for preventive maintenance.

Data Sheet:

Rotating Part – Sensor Connection Side:
ADC converter resolution 16 bit (65536 steps).
Sampling Frequency up to 2000 Hz.
Amplification thermal stability 10 ppm/°C
Working temperature -10 ÷ 80 °C ~ Optional Tmax 125°C

Fixed Part – Power Supply And Data Output Side:
Power supply 12 ÷ 24 VDC.
Analogue output (DAC 16bit): Current 2-20 mA - Tension 0-5V / 0-10V.
Total galvanic isolation optional
Digital output RS485/ModBus and CANopen.
Working temperature -10 ÷ 80 °C ~ Optional Tmax 125°C
Thermal stability 10ppm/°C.

Applications:

The photo shows an application for monitoring the load applied to a gear unit. In this case the shaft rotates at the nominal speed of 1800 rpm and the monitored torque can assume values in the range +/- 3000 Nm.