building a 30hp rotary phase conveter for my shop, need to know how many micro farids for this motor to start.
The starting cap is sized to provide a phase shift to the start winding. Capacitance and voltage will depend on motor design, voltage, frequency, required starting torque, HP, and the design current of the start winding. You'll need to know alot more about your motor before doing the calculations. Your motor manufacturer has already done the work. Look 'em up. Don
