Which of the following is NOT a type of single-phase AC motor?

Asynchronous motors are predominantly three-phase motors, where the rotor turns at a speed that is less than the synchronous speed of the rotating magnetic field created by the stator. In contrast, single-phase AC motors, such as capacitor motors, shaded-pole motors, and split-phase motors, are specially designed to operate on a single-phase power supply.

Capacitor motors utilize capacitors to enhance starting torque and efficiency. Shaded-pole motors provide a simple and economical design, ideal for low power applications. Split-phase motors are designed to create a phase shift to start the motor, enabling it to run efficiently on a single-phase supply. These characteristics expressly differentiate single-phase motors from asynchronous motors, affirming that asynchronous motors do not belong to the category of single-phase AC motors.