Which of the following is a method of PHASE-SPLITTING in a single-phase induction motor?

In the context of phase-splitting methods used in single-phase induction motors, using a shaded pole is a valid and effective technique. A shaded pole motor is designed with a special configuration in which the pole is shaded by a portion of copper or other conductive material. This shading creates a delayed magnetic flux in the shaded area, which effectively generates a phase shift in the magnetic field. As a result, a rotating magnetic field is produced that allows for the starting and running of the motor.

This method is specifically suited for low-power applications where the starting torque requirements are not excessive. The unique design of the shaded pole creates a split-phase effect, allowing the motor to operate efficiently despite the single-phase supply.

In contrast, utilizing a capacitor in series with the main winding is a common method for enhancing starting torque but not specifically a phase-splitting technique like the shaded pole arrangement. Directly connecting both windings does not create the necessary phase difference, and having both auxiliary windings of equal impedance typically does not produce the phase shift required for efficient operation. Therefore, shaded pole motors stand out as a clear example of phase-splitting.