Most single-phase induction motors are made with two stator windings: a run winding (main winding) and a ____________ winding.

In single-phase induction motors, the design typically includes two stator windings to facilitate proper operation. The primary winding is commonly referred to as the run winding, which is responsible for continuous operation once the motor reaches its rated speed. The secondary winding in this context is more accurately called the auxiliary winding, which plays a crucial role during the starting phase of the motor.

The auxiliary winding is energized temporarily to create a phase shift in the current, allowing the motor to start more effectively by producing a rotating magnetic field. This magnetic field is essential for initiating rotation in single-phase motors, as they cannot start on their own due to the absence of a rotating magnetic field that is present in three-phase motors.

Therefore, the term 'auxiliary' is the correct descriptor for the additional winding that assists with starting, differentiating it from the main or run winding that operates continuously once the motor is up to speed. The other options do not accurately represent this winding's function or its role in the motor's operation.