Data acquisition
switching frequency range of the inver ter, high-speed sampling is necessary. However, with the conventional system, not only was sampling slow but it was also impossible to capture the phenomenon in the relatively high-speed regions in order to investigate torque ripple or switching frequency related issues. To combat this, the HBM eDrive system was able to measure voltage and current signals with high speed sampling of 2MS/s and provide half cycle power measurement calculation. Fur thermore, unlike the conventional
technique, which meant that only analysis based on the averaged calculation results was possible, the HBM eDrive was able to accurately process all the raw data at high speed, with the added option of a Genesis HighSpeed 1,000V input card to directly measure a high voltage of 600V. As output can be quickly viewed on one
screen as opposed to switching between the time-axis and the FFT display, the new system also offered researchers ease of use and was a welcomed alternative. When researchers at NEDO and MagHEM
losses in minutes rather than days. This is impor tant for the optimisation of the drive as well as the increase in efficiency. By synchronising the measurements of all measured parameters, the measurement process was not only made substantially simpler for NEDO and MagHEM’s
Instrumentation Monthly March 2019
research but it also greatly improved test efficiency, as real-time computation enabled simultaneous observation of measured waveforms, such as magnetic flux and torque waveforms, as well as computed waveforms, such as iron loss separation. As iron-loss separation requires data in the
wanted to develop a magnetic motor with 40 per cent less energy loss, they turned to HBM to provide a system which could provide synchronised data in real time, which is an impor tant prerequisite for fur ther development of the motor.
HBM
www.hbm.com/en/ 31
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