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Forums
Engineering
Electrical Engineering
AC motor rotary capacitor soft start
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[QUOTE="artis, post: 6331861, member: 652341"] I was wondering about , have there been or are there any systems that would use a large capacitance rotary capacitor/s as a mechanism for soft start of larger AC motors and also they would serve as power factor correction devices? The idea is basically simple, say one has a 3 phase motor and we have 3 identical rotary capacitors connected in series with each of the phases, the capacitors are set at their lowest capacitance when the power is applied and then they can be gradually turned to larger capacitance this way the current through the motor winding would rise proportionally to the rise in capacitance, such a setup would form a series LC but at some resonant point the whole circuit would become resistive and draw lots more current than an inductive circuit , so i guess that is one drawback I can see, are there any other ones? Maybe the circuit would be useful at startup and when the motor has reached certain rpm the caps could be bypassed by relays directly to grid. [/QUOTE]
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AC motor rotary capacitor soft start
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