- Joined
- Jan 22, 2011
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- 8,031
Well, the current (pardon the pun) concern is precisely because of the change to IGBT's where the switching is so fast, rather than the old Darlington pair.
But I'd agree that this should not be a problem. I've done some power analysis on several hundred HP VFD's, and observed the reflected wave, but I can't see the additive effect amounting to enough to exceed the safety of any industrial motor insulation, and unless it was continuous, and perfectly phased wrong so as to present a short, there almost can't be an issue. I'm no EE, but I'm not ignorant of the subject either.
But I'd agree that this should not be a problem. I've done some power analysis on several hundred HP VFD's, and observed the reflected wave, but I can't see the additive effect amounting to enough to exceed the safety of any industrial motor insulation, and unless it was continuous, and perfectly phased wrong so as to present a short, there almost can't be an issue. I'm no EE, but I'm not ignorant of the subject either.