Difference Between Slip Ring And Squirrel Cage Rotor, What is Slip Ring Rotor, What is Squirrel Cage Rotor

Hello Guys, welcome back to my blog. In this article, I will discuss the difference between slip ring rotor and a squirrel cage rotor. Each and everything I will try to explain in a simple way.

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Difference Between Slip Ring And Squirrel Cage Rotor

The basic difference is:

Difference Between Slip Ring And Squirrel Cage Rotor, What is Slip Ring Rotor, What is Squirrel Cage Rotor


01. Rotor
02. Resistance
03. Maintenance
04. Industry Application
05. Rotor Resistance Starter
06. Speed Control

07. Uses
08. Construction
09. Slip Ring & Brush
10. Cost
11. Starting Torque
12. Wounding of Rotor
13. Rotor Copper Losses

The squirrel cage rotor is cylindrical in shape and slotted on its periphery. The cage rotor consists of copper or aluminum bars which are uninsulated called rotor conductors, in slots bars are placed. These bars are shorted with the help of end rings. The slip ring rotor construction of the rotor windings is exactly equal to the stator. The slip ring rotor construction is laminated and slotted and the slots contain the rotor winding.

Now I will explain in detail about the above things.

01. Rotor - In the case of a slip ring, the rotor consists of three-phase winding which is similar to the stator winding whereas, in case of squirrel cage, end rings are used to short the bars at the end which rotor consists.


02. Resistance- In the slip ring rotor, resistance can be added externally whereas, in squirrel cage, bars are shorted permanently so external resistance cannot be added.

03. Maintenance- The construction of the slip ring rotor is delicate and due to the brush frequent maintenance is required whereas in the squirrel cage rotor the construction is robust and maintenance is free.

04. Industrial Application- Only 5% slip ring rotor type motors are used in the industry whereas 95% of squirrel cage rotor type motors are used in the industry.

05. Rotor Resistance Starter- In the case of a slip ring rotor, a rotor resistance starter can be used whereas in the case of a squirrel cage rotor, a rotor resistance starter cannot be used.

06. Speed Control- The speed control by rotor resistance is possible in a slip ring rotor whereas the speed control by rotor resistance is not possible in the case of squirrel cage rotor.

07. Uses - The slip rings rotor type motor is used in lifts, hoists, cranes, elevators, compressors, etc whereas the squirrel cage rotor type motor is used in water pumps,  lathes,  fans, blowers, grinders, printing machines, drilling machines, etc.

08. Construction- The construction of a slip ring type rotor is complicated whereas the construction of the squirrel cage type rotor is very simple.

09. Slip Ring & Brush- In slip ring rotor, slip ring and brush are present to add external resistance whereas, in the cage rotor, brushes and slip rings are absent.

10. Cost- The rotor cost is more in slip ring type whereas, in the cage type due to simple construction, the cost is less.

11. Starting Torque- In-ring type rotor, high starting torque can be obtained whereas in the cage rotor moderate starting torque which cannot be controlled.


12. Wounding Of Rotor- The rotor must be wound for the same number of poles as in stator, in slip ring type whereas in cage type, the rotor automatically gets adjusts itself for the same number of poles as that of the stator.

13. Rotor Copper Loss- In the case of a slip ring, efficiency is less due to high rotor copper loss whereas, in the case of a cage rotor, the efficiency is high due to low rotor copper loss. 

I hope this article may help you all a lot.

Thank You For Reading......Bye......

Tags: Difference Between Slip Ring And Squirrel Cage Rotor, What is Slip Ring Rotor, What is Squirrel Cage Rotor.
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