Currently, power analyzers are normally used on the motor input and torque transducers on the motor output to measure the efficiency of electric motors. The difference between the respective electrical power and the resulting mechanical power generated by the electric motor is the energy loss.

However, statements about the causes of this loss cannot be made in this manner. In addition, the measurement devices, which frequently originate from different manufacturers, need to be laboriously synchronized before a test. This frequently leads to measurement errors. Highly-dynamic power measurements with more than 50 measurements per second are also technically difficult. Another problem with current power analyzers is that they simply deliver final results. But it is precisely the raw data that can provide important knowledge during basic research to understand the process and to develop more efficiency.

HBM now promises a remedy: With a combination of Genesis HighSpeed measurement data acquisition and the torque transducer T12. This perfectly matched duo makes it possible to carry out long-term tests with precisely defined characteristics and without annoying synchronization. Continuous measurements of up to an hour in duration, with up to one million measurements per second per channel are therefore child's play.

HBM test and measurement equipment in a test bench for combustion engines and electric motors at Darmstadt Technical University, Institute for Combustion Engines and Vehicle Drive Systems (Institut für Verbrennungskraftmaschinen und Fahrzeugantriebe)

The resulting raw data is then available to developers for precise evaluation. Valuable knowledge can be obtained on this basis for optimizing the efficiency of electrical drives. And HBM also meets the wishes of users for calculation results such as the power factor in the new system with correspondingly new developments.