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Engineering
Electrical Engineering
AC motor rotary capacitor soft start
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[QUOTE="artis, post: 6332162, member: 652341"] I know that the capacitance needed for a large current transfer is large, I did not necessarily stated that this is practical bu more of a theory. I was wondering how in theory this would work. Although these days with tight tolerances between the plates there are some newly made superdielectric fluids that are said to have dielectric constants up to about 1000 and more. I don't have the papers at the moment but if one wants I can find them. Surely with such a dielectric the necessary plate area would decrease and such a rotary capacitor become more realistic would it not? the beauty of it is that it would be very simple and robust, unlike the semiconductor voltage/frequency drives. although for a AC motor at satrtup I guess one easy way to control it is to use a thyristor, which by cutting the sine would also limit the inrush current. [/QUOTE]
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AC motor rotary capacitor soft start
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