Final answer:
The wound-rotor induction motor has three slip rings on the rotor shaft, allowing for adjustable speed and torque characteristics, making it a versatile option for industrial applications.
Explanation:
The wound-rotor induction motor is the motor that has three slip rings on the rotor shaft. These slip rings allow for external resistance to be connected to control the motor's speed and torque characteristics.
Unlike the squirrel cage induction motor which has a rotor with short-circuited conductors or the slipring induction motor which has two slip rings, the wound-rotor induction motor provides the flexibility to vary the rotor resistance, making it suitable for applications that require adjustable speed and torque.
The use of slip rings in the wound-rotor induction motor enables a smooth starting torque and speed control, making it a versatile option for various industrial applications.
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