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What is slip ring in induction motor?
A wound-rotor motor, also known as slip ring-rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. Adjusting the resistance allows control of the speed/torque characteristic of the motor. Each pole is wired in series with a variable power resistor.
What is a slip ring and what does it do?
A slip ring passes electrical signals and power across a rotating interface using sliding electrical contacts. These contacts are typically a rotating ring and a stationary brush, or wiper, that slides along the ring surface during rotation.
What are slip ring motors used for?
A slip ring induction motor is capable of maintaining the highest torque at any slip. Even a high braking torque can be maintained easily. It is mainly used for high starting torque which makes use of an external resistance. They can help in speed control for lifts, railway traction, elevators, etc.
What is slip ring in 3 phase induction?
The three end terminals are connected together to form a star connection. As its name indicates, three phase slip ring induction motor consists of slip rings connected on the same shaft as that of the rotor. The three ends of three-phase windings are permanently connected to these slip rings.
What is slip in induction motor formula?
Slip speed is the speed difference between the Synchronous speed and Rotor speed. Slip speed = Synchronous speed – Rotor speed = Ns -N. Slip, s = (Ns – N) / Ns.
What are advantages of slip rings?
Advantages:
- High Starting torque with low starting current.
- Speeds can be adjusted in the case of slip ring (wound rotor) induction motor by inserting an resistance.
- Slip ring motors have high over loading capacity, smooth acceleration under heavy loads, and no abnormal heating during starting.
What is Construction difference between slip ring and squirrel cage induction motor?
The major difference between them is that the slip ring’s motor comes with an external circuit that controls the speed of a motor. On the other hand, the squirrel cage motor does not have any external circuit and it is not possible to add one since the motor bar is spotted permanently at the end of that ring. 2.