What is wound type rotor?
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.
What is a 3 phase wound rotor motor?
A wound rotor motor is a variation of the three-phase induction motor, designed to provide high starting torque for loads with high inertia, while requiring very low current. Wound rotor motors are also referred to as “slip ring motors.”
What is rotor construction?
The rotor is a cylindrical core made of steel lamination with slots to hold the wires for its 3-phase windings which are evenly spaced at 120 electrical degrees apart and connected in a ‘Y’ configuration. The external resistances become a part of the rotor circuit to produce a large torque when starting the motor.
How is the construction of the rotor difference between the wound rotor induction motor and the squirrel cage motor?
The phase wound motor consists external resistance circuit, whereas in squirrel cage motor it is not possible to add any external resistance circuit because their rotor bars are permanently slotted.
Why wound rotor construction is adopted?
Q: Why wound rotor construction is adopted? Answer. The wound rotor has the facility of increasing the rotor resistance through slip rings. High value of rotor resistance is needed during starting to get a high value of starting torque.
How does the rotor work?
Rotors are designed to turn motion (kinetic energy) into thermal energy (heat). When you press down on the brake pedal, it sends a signal via the master brake cylinder to your calipers to squeeze your brake pads together against the rotors’ large surface area.
How does a motor rotor work?
In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction from the rotating magnetic field of the stator winding. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor.
What is the working principle of 3 phase induction motor?
Therefore, the working principle of a 3-phase induction motor is fundamentally based on electromagnetic induction. The RMF passes through air gap and cuts the rotor conductors, which are stationary at start. Due to relative motion between RMF and the stationary rotor, an EMF is induced in the rotor conductors.
What is a three-phase induction motor and how does it work?
The working of the three-phase induction motor is based on the principle of electromagnetic induction. When three-phase stator winding of an induction motor is energized from a 3 phase supply, a rotating magnetic field is set up which rotates around the stator at synchronous speed (Ns).
What is the rotor windings for wound rotor motor?
What is the rotor windings for wound rotor motors? Explanation: The rotor windings for wound rotor motors are 3 phase windings. The number of rotor slots should be such that a balanced winding is obtained. 2.
What is a wound rotor 3 phase motor?
This type of 3-phase induction motor has high starting torque, which makes it ideal for applications where standard NEMA design motors fall short. The wound-rotor motor is particularly effective in applications where using a squirrel-cage motor may result in a starting current that’s
What is a wound rotor induction motor?
A wound rotor induction motor has a stator like a squirrel cage induction motor, but a rotor with insulated windings brought out via slip rings and brushes. However, no power is applied to the slip rings.
What are the downsides of a wound rotor motor?
The downsides of wound rotor motors are the complexity and maintenance added by the slip rings and brushes, as compared to traditional squirrel cage motors.
How do you control the speed of a wound rotor motor?
The technique of starting wound-rotor motors with resistance in the rotor circuit is also used for speed-control applications. You can reduce the resistance in steps to permit the motor to come up to normal speed.