What is the difference between squirrel cage and slip ring

Thanks, Jimmy. Please upload notes for Electronics and Communication. Thanks for suggesting. Soon, I will try to cover this topic. Thanks, Animesh for adding this point. The construction of the squirrel-cage rotor is very simple as compared to the slip ring rotor of the motor. The construction of the squirrel-cage rotor is difficult due to the connected slip rings and bushes. In an internal connection of the squirrel-cage motor, rotor winding is similar to the stator winding.

The basic difference between the slip ring and squirrel cage motor is that in slip ring motor exterior resistance circuitry is used to control the speed of the motor.. So friends that is a detailed post about the difference between slip ring motor and squirrel cage motor.

If you have any question ask in comments. Thanks for reading. I am a professional engineer and graduate from a reputed engineering university also have experience of working as an engineer in different famous industries. It also consists of a group of electro-magnets arranged around a cylinder, with the poles facing toward the stator poles.

Advantage of induction motors are that they are robust and can operate in any environmental condition. Squirrel-cage Induction motors are cheaper in cost due to the absence of brushes, commutators, and slip rings. They are maintenance free motors unlike dc motors due to the absence of brushes, commutators and slip.

Q: Why wound rotor construction is adopted? 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. The squirrel cage induction generator SCIG is attached to the wind turbine by means of a gearbox. The SCIG stator windings are connected to a back to back full power converter. The wind turbine is responsible for transforming wind power into kinetic energy.

In an electric motor, the stator provides a rotating magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current. In fluid powered devices, the stator guides the flow of fluid to or from the rotating part of the system. A double squirrel cage induction motor consists of a rotor which has two independent cages one above the other in the same slot.

A double squirrel cage rotor is shown in the figure. The upper slot conductors from the outer cage and the lower slot conductors form the inner cage. Also called rotary electrical interfaces, rotating electrical connectors, collectors, swivels, or electrical rotary joints, these rings are commonly found in slip ring motors, electrical generators for alternating current AC systems and alternators and in packaging machinery, cable reels, and wind turbines.

Compared to squirrel cage rotor the rotor construction is not simple. Cylindrical laminated core rotor with heavy bars or copper or Aluminum or alloys are used for conductors. Cylindrical laminated core rotor is wound like winding on the stator. Rotor conductors or rotor bars are short circuited with end rings.

At starting the 3 phase windings are connected to a star connected rheostat and during running condition, the windings are short circuited at the slip rings.

Rotor bars are permanently short circuited and hence it is not possible to connect external resistance in the circuit in series with the rotor conductors. It is possible to insert additional resistance in the rotor circuit. Therefore it is possible to increase the torque; the additional series resistance is used for starting purposes.