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How to calculate run capacitor value for inductive motor?


At the attached circuit diagram you can see the connection of inductive motor
(2 coils)with a capacitor and 12VAC source.
I would like to know how should i calculate the right value of the C1 capacitor in order to achieved a 90° shift in the capacitor-coil branch,so the motor will spin well?(according to the spec.that i drew on the diagram).


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