Which of the following is a typical three-phase squirrel-cage motor?

The typical three-phase squirrel-cage motor is fundamentally an induction motor. This type of motor operates on the principle of electromagnetic induction, where the rotor is a series of conductive bars shorted at the ends, resembling a squirrel cage, which is highly efficient and widely used in various industrial applications due to its simplicity and reliability.

While all motors listed have their own unique applications, the permanent magnet motor, for instance, utilizes permanent magnets to create a magnetic field, and stepper motors operate on a different principle, as they move in discrete steps and are mainly used in applications requiring precise control over position rather than just speed. Therefore, the correct identification of the typical three-phase squirrel-cage motor is the induction motor, as it is specifically designed to operate efficiently on a three-phase system.

The mention of "All of the above" may mislead by suggesting that all motor types are typical representations of a three-phase squirrel-cage motor when, in actuality, only the induction motor fits that specific definition.