Engine Output Torque Sensors


Designed to accurately measure engine output or transmission input shaft torque, the MagCanica engine output / clutch shaft torque sensor system is currently used at track tests and races to optimize internal combustion engine, motor-generator unit, and gearbox performance, and is often mandated for use by automotive regulating bodies. The torque-sensor does not contact the shaft but utilizes a small radial gap of typically 2mm. Sensitivity to axial movement can be minimized with standard machining tolerances.


Typical nominal torque ranges are approximately 600Nm with overloads up to 1500Nm, while rotational speeds can range from 0 RPM to as high as 20,000 RPM. High reliability and robustness allow the system to survive the very harsh transmission input environments, which are often characterized by very high temperatures, vibration levels, and the presence of oil (either wetted or submerged).


  • The total width of the sensor is typically ~35mm 
  • While a raised ‘transducer’ region may be required on the shaft such that the maximum stress is within the material’s allowable limitation, this is only true in the immediate region where the sensor is located (“measurement zone”). The sensor itself weighs approximately 150grams.
  • This sensor is a compromise that offers both high accuracy (typically ~1%) but in a smaller package that features significant magnetic shielding. 
  • Dependent on the design, typical rated-capacities are 2000Nm acceleration to -2000Nm deceleration. 
  • The accuracy is specified over the operating temperature range of ambient temperature (20°C) to 150°C operating, with the sensor able to withstand temperatures exceeding these limits.
  • The strain relief is typically integrated into the housing. 
  • The wire exiting the sensor housing is typically 750mm in length and not terminated, such that pigtails are provided. 
  • The units are fully sealed and can be exposed to water and oil-wetted environments or even immersed in oil.