A wound-rotor induction motor with external resistance typically functions as what type of motor?

A wound-rotor induction motor with external resistance typically functions as a multispeed motor. This type of motor allows for the adjustment of the rotor resistance, which in turn affects the slip and speed characteristics of the motor. By varying the resistance connected to the rotor circuit, it is possible to control the motor's starting torque and speed, achieving multiple operational speeds.

The ability to fine-tune the rotor resistance leads to flexibility in applications requiring different speed operations, making it suitable for scenarios where variable speed control is necessary. This is particularly useful in industrial applications where diverse processes demand different speeds for optimal performance. Such capabilities are not present in constant-speed or single-speed motors, which operate at fixed speeds without the capacity for speed variation or adjustment.