The Importance of Torque Measurements

The measurement of torque is of high importance, not only to industrial engineers, but also when used in many other applications. The accurate determination of torque is needed for many industries, with one being for the users and manufacturers of test benches.

Torque measurement helps to satisfy the need for modern engines to provide enhanced mechanical performance by improving their accuracy and accelerating their rate of rotation for efficiency measurements.

The field of torque measurement is constantly evolving to apply torque measurement to different areas of application. Conventional torque shaft systems are still frequently used by industry; however, to aid with the constant diversification of torque measurement, transducers from HBM now include torque measurement by shafts and flanges.

There have been numerous advances in the design of torque transducers. This includes contactless transducers, which measure the power transfer between the stator and rotor, and the transmission of measurement signals.

The Importance of Measuring Torque

The measurement of torque is important for a wide variety of different applications which range from Formula 1 testing (with speeds of more than 20,000 min-1 and a nominal torque of approximately 2 kN.m) and power turbines (with an output of 40 MW and a nominal torque of 8,000 min-1).

The measurement of torque is crucial for most industries and is even used to measure the tolerance of screw craps on medical containers, which must sit within regulations.

The automotive industry is often under pressure to provide vehicles which provide low fuel consumption, a reliably long lifetime, a high operating safety and high comfort levels. This requirement, combined with the need to reduce emissions, means that there is a greater need for metrological and test techniques.

The data needed for this development must be reproducible and accurate, with torque being one of the most important measurements, especially when considering the engineering of combustion engines and power transmission. Torque measurement, when combined with knowledge on rotational speed, allows the mechanical power of a system to be determined.

Conventionally when using engine test benches, measurement was carried out using braking devices. However, it is now possible to carry out in-torque measurements using a rotating torque transducer.

This is becoming a more commonly used technique as it uses a dynamic process, which gives insight into the (increasingly important) relationships between the mechanisms to be optimized.

Torque Transducers from HBM

HBM is the world-leading supplier of torque transducers. HBM can provide over 50 years of expertise in electrical methods of determining mechanical parameters. HBM’s service teams even now still receive 1st-gen transducers for calibration, testing or complete overhauls.

HBM was first accredited as a DKD (the German calibration authority) calibration lab for force measurement in 1997, meaning it was the first calibration lab to join. Accreditation for the measurement of torque was awarded in 1990, making HBM the only accredited torque authority in Germany for many years.

HBM can now provide a broad variety of calibration steps in the DKD, which range from 2 N·m up to 400 kN·m. Their systems are extremely accurate, achieved with the use of a mass-lever system where the direct generation of force is generated by the action of a mass under gravity. Calibration is achieved in their labs using a reference transducer.

HBM was the first company in Germany to receive ISO 9001 accreditation, following which they received ISO 14001 accreditation in 1996.

This information has been sourced, reviewed and adapted from materials provided by Hottinger Baldwin Messtechnik GmbH (HBM).

For more information on this source, please visit Hottinger Baldwin Messtechnik GmbH (HBM).

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