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How to choose the capacitor of 220V500W motor?
Capacitors with a capacitance of about 20(μF) should be used.

Rated current of 220V500W motor (approximate value):

I=P/U/cosφ=0.5/0.22/0.8≈2.8(A)

Operating capacity of motor:

c = 1950×I/u×cosφ= 1950×2.8/220×0.8≈20(μF)

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