Machine Design

Torque transducer gets small for auto testing

Conventional torque sensors usually need a minimum shaft length to work properly, thus making them difficult to accommodate in some powertrain applications.

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.

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