Improved insight when testing electric drive systems

However, this method does not enable statements to be made about the causes of the energy loss. It is the raw measurement data from basic research, not the final results, that provide important insight into the process so developers can make the motors more efficient.

In addition, testers often use measurement devices from different manufacturers, and these devices must be laboriously synchronised before a test. This frequently leads to measurement errors. Moreover, highly dynamic power measurements with more than 50 measurements per second are also technically difficult.

A tool to collect raw data is needed for any profound improvement of electric drives, motors or generators. While a power meter can determine efficiency, it cannot explain that efficiency or help identify approaches that can increase efficiency because the data is already compressed.

HBM's eDrive testing system continuously stores all raw data - including currents, voltages, torque, rotational speed and even motor temperature - at high resolution in an integrated system. Additionally, root-mean-square (RMS) values - along with active, apparent and reactive power - are displayed in real time during the measurement, just like with a power meter.

Using powerful mathematical functions and a formula database, the eDrive system takes measurements and performs analysis directly - instead of requiring separate maths packages. This integration saves users time, improves flexibility and lowers the error ratio.

Developers can also carry out a more detailed analysis of space vector, dq0 transformation, fundamental and switching frequency, air-gap moment, slip, iron loss and control behaviour, just to name a few.

The HBM eDrive testing system will be on show at the EIS Instrumentation, Testing & Analysis show on 15 March 2016 at Silverstone Conference and Exhibition Centre. HBM is on stands 66 and 67. The show includes a number of open forums, free car parking and complimentary refreshments.