The plot shows a zoomed in view of the leading edge of a voltage pulse. Figure 1 shows the rise time and peak voltage of the waveform measured line-line at the motor terminals as defined by the NEMA standard. The standard defines the peak voltage Vpeak as the zero to peak line-to-line voltage. The NEMA standard defines rise time as 10% to 90% of the steady state voltage. The rest of this post will focus on the NEMA standard NEMA MG 1 Definitions Therefore, it is important to look carefully at the standard and how to measure the drive waveforms. However, the definitions of rise time are slightly different. Two of the most common standards are the NEMA MG 1-2016 standard and the IEC 60034-25 standard.īoth standards provide similar guidelines on the rise time and peak of the leading edge of the voltage waveform. These standards set recommended limits on the rise time of the voltage waveform and the peak voltages allowed. Due to the negative effects of switched power electronic drives on electric motor lifetime in certain situations, several industry standards have been developed.
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