It is important to point out from the phasor diagram that the phase difference between Im and Is is almost 80 degrees as against 30 degrees in a split-phase induction motor. When the motor reaches about 75% of the full load speed, the centrifugal switch S opens and thus disconnecting the starter winding and the capacitor from the main winding. Thus more the difference between the Is and Im, better the resulting rotating magnetic field. But the current through the main winding Im, still lags the applied voltage V across the circuit. During starting, as the capacitor is connected in series with the starter winding, the current through the starter winding Is leads the voltage V, which is applied across the circuit.
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