![]() We also can use this basic formula to calculate capacitor sizing :Ģ) Determine the voltage rating for capacitor. To select the correct capacitance value, start with 30 to 50μF/kW and adjust the value as required, while measuring motor performance. How to sizing the starting capacitor?ġ) A rule of thumb has been developed over the years to help simplify this process. ![]() When replacing these capacitors, the capacitance value and voltage should be taken from the manufacturer’s plate on the motor or from the old capacitor.This must be correct within ±5% and is sometimes stipulated down to a fraction of a μF.The choice of a running capacitor is even more limited than with a starting capacitor. This is basically a question of motor design.There is no straightforward regular relationship between capacitance and the motor size in kW. ![]() When install a motor using capacitor for starting or running methods,we must sizing the rated of capacitor suitable with motor to get correct starting torque and avoid winding from overheating and can cause a damage. ![]()
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