Quote:
Originally Posted by Alex KL-1
Hehe, spikes and noise... here sometimes a very huge spike occurs in the waveform, making noise in EMI filter, trafos, even in some motors...
And, some years ago, I worked at a transformer factory, with plenty of motor inverters: the mains waveform at that place with full production run are almost a squarewave (with rounded corners...)
Ahh, those modern appliances... 
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You have to wonder what the waveforms look like using invertors to convert HV DC to 3 phase AC, such is in use today.

Three phase AC Motors have to be a special design to be invertor duty!