In many power transmission systems, torque is a important parameter to indicate the system performance. Dynamically monitoring the torque value help improve the control scheme, enhance the efficiency and reduce the failure rate with predictive maintenance.
Strain gauge is a popular approach for torque sensing, however, the complexity increases when the power has to be supplied to the gauge glued on the rotating shafts via slip ring and the signal to be transmitted back to the standstill processor wirelessly.
The innovative solution avoids any power or signal on the rotating shaft by installing two sets of magnetic belt encoders separated on the shaft in a distance of hundreds of millimeters. Comparing the angular difference of the two sets and combining the shaft cross section dimension and material shear modulus, the system can calculate the shaft distortion and torque dynamically and precisely.
The speed and power rate value are also available.
Unloaded ShaftShaft torsion caused by load
The passive magnetic scale on rotating shaft offers various advantage over traditional torque sensing systems.
