Dynamic Torque Measurement Reveals True Electric Machine Characteristics

Focus:

Mechanical measurements help characterize a motor, build up models for the machine, ensure confidence in controllers and understand the limits of the system. Torque accuracy and bandwidth are particularly important for designing a controller and implementing an electric motor solution. Since torque is not a static value, it is preferred to have a highly accurate averaged measurement. It’s also valuable to make high-bandwidth torque measurements to understand what happens instantaneously, by measuring cogging torque for a steady-state operation, torque response during loading and even torque during control changes. This article demonstrates how such measurements can be made using a highly accurate and high bandwidth torque sensor, such as the T12HP, in combination with the eDrive power analyzer. Because of instrument capabilities, these measurements are made using high sample rates with real-time cycle count averaging to obtain faster torque measurements even during dynamic load changes.

What you’ll learn:

• How to make highly accurate averaged measurements and high bandwidth measurements of motor torque
• How to make faster motor torque measurements during dynamic load changes
• How to understand the benefits of the eDrive power analyzer in making torque measurements

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Author & Publication:

Mitch Marks, HBM Test And Measurement, Madison, Wisc., How2Power Today, Sep 14 2018

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