Electrician Red Seal · Question
What is the purpose of slip rings and brushes in a wound rotor induction motor?
In a wound rotor induction motor, slip rings and brushes allow connection to external resistors in the rotor circuit. This resistance can be varied to control t
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Question: What is the purpose of slip rings and brushes in a wound rotor induction motor?
Answer options:
- To provide DC excitation to the rotor. ✅ To allow external resistance to be added to the rotor circuit for speed control and starting torque.
- To transfer power from the stator to the rotor.
- To switch the direction of rotation.
Correct answer: To allow external resistance to be added to the rotor circuit for speed control and starting torque.
Explanation: In a wound rotor induction motor, slip rings and brushes allow connection to external resistors in the rotor circuit. This resistance can be varied to control the motor's speed and improve starting torque characteristics.
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