The T10F torque flange from HBM Inc., Marlborough, Mass., however, determines torque by measuring shear stress and comes in a compact package. The flange is designed for automotive test stands and offers a true 3 kNm (2,200 lb-ft) measuring range with a minimum vibration bandwidth of 160% and a breaking torque of more than four times full scale. Maximum speeds are 8,000 or 15,000 rpm, depending on the nominal torque. The units' high dynamic loading lets users select a lower nominal torque than possible with conventional torque transducers that measure torsional stress.
Shear signals and voltage pass inductively between the shaft-mounted antenna and a controller. There are no bearings or slip rings, so maintenance is minimal. An optional RPM counter reduces the need for additional transducers.