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Tuesday December 12th 2017
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Shutter/Jerking Current Waveform

Attached is a picture of the filtered Phase 1 PWM signal (green) and its resulting Phase 1 motor current (yellow) in open loop control mode.

Expanded view shows the current variation (yellow) which results in the shutter/jerking.  It smooth before and after this section.  The higher current peaks are about 400 amps.  Not sure what is causing this. 

  

No Load Neutral Test below shows a similar current variation at lower speed.  This might confirm the current variation seen above is due to slip and loss of sync as suspected.