What is the disadvantage of squirrel cage rotor?

Squirrel Cage Induction Motor:

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Squireel cage induction motors are widely used in industries. Almost 70% of the industrial motors and drives comes under these category. In Squirrel cage induction motors, rotor windings wound in squirrel cage. These motors are very robust in construction and very cheap. These motors can operate at any working conditions. Some of the advantages, disadvantages and applications of squirrel cage induction motor compared with slip-ring induction motor are discussed below:

Advantages of Squirrel Cage Induction Motor:

• Squirrel Cage Induction motors are cheaper in cost compared to Slip Ring Induction motors.
• Requires less maintenance and rugged construction. Because of the absence of slip rings, brushes maintenance duration and cost associated with the wear and tear of brushes are minimized
• Squirrel Cage Induction Motors requires less conductor material than slip ring motor, hence copper losses in squirrel cage motors are less results in higher efficiency compared to slip ring induction motor
• Squirrel cage motors are explosion proof due to the absence of brushes slip rings and brushes which eliminates the risks of sparking.
• Squirrel Cage motors are better cooled compared to slip ring induction motors
• Squirrel cage motors operate at nearly constant speed, high over load capacity, and operates at better power factor.

Squirrel Cage Induction Motor Disadvantages:

Some of disadvantages or demerits of squirrel cage induction motors are listed below:

• Main disadvantage of squirrel cage induction motor is that they have poor starting torque and high starting currents. Starting torque will be in the order of 1.5 to 2 times the full load torque and starting current is as high as 5 to 9 times the full load current. In slip ring induction motors, higher starting torque can be attained by  providing an external resistance in the rotor circuits during starting of the slip-ring induction motor. This arrangement in slip-ring induction motors also reduces the high inrush currents during starting of induction motor.
• Squirrel cage induction motors are more sensitive to the supply voltage fluctuations. When the supply voltage is reduced, induction motor draws more current. During voltage surges, increase in voltage saturates the magnetic components of the squirrel cage induction motor.
• Speed control is not possible in squirrel cage induction motor. This is one of the major diadvantages of squirrel cage induction motors.
• The total energy loss during starting of squirrel cage motor is more compared to slip ring motors. This point is significant if the application involves frequent starting.

Application of squirrel cage Induction Motor:

Squirrel Cage Induction Motors are widely used in Industrial applications than slip ring induction motors due to cheaper in cost, rugged in construction, low maintenance. Squirrel Cage Induction Motors are suitable for applications where the drive requires constant speed, low starting torque and no speed control drives.

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Induction motor is very popular in commercial and industrial applications. Especially, the squirrel cage induction motor is one of the best.

Recently, the squirrel cage induction motor is known as one of the most efficient and beneficial motors. Even industrial heavy-loaded appliances and drives work on this motor. Moreover, the cage induction motor comes with more benefits and advantages.

Here, we will study what are the advantages of a squirrel cage induction motor over a slip ring. Also, look at the disadvantages.

Advantages and Disadvantages of Squirrel Cage Induction Motor

Why is a squirrel cage induction motor more often used than a wound (slip ring) induction motor?

Let&#;s dive into the basic merits and demerits.

Advantages (or Pros) of Squirrel Cage Induction Motor

1. The construction of the squirrel cage induction motor is simple as compared to the slip-ring induction motors.
2. Less conducting materials are needed for the cage induction motor.
3. Especially, the rotor of the squirrel cage induction motor has fewer winding turns as compared to the rotor of the slip ring induction motor.
4. There is no more equipment (such as brushes, slip rings, etc) required or inbuilt in this motor.
5. The maintenance of the squirrel cage motor is less.
6. The cost of the cage motor is cheaper than the wound motor.
7. This motor has a good ability to regulate the constant speed.
8. There is no require a continuously adjustable-speed drive.
9. This motor has high efficiency and good reliability.
10. The squirrel cage induction motor is used for a wide range of applications in industries. Approximately 90% of industrial motors and drives work under this induction motor.
11. Also, this is very beneficial and useful for more commercial appliances like as fans, pumps, blowers, printing machines, drilling machines, conveyors, lathes, etc.
12. In this motor, good cooling is available due to the presence of more space in rotor slots. So, less heat is generated.
13. There are fewer risks for sparking.
14. The copper loss in the squirrel cage induction motor is minimum.

Disadvantages (or Cons) of Squirrel Cage Induction Motor

15. The squirrel cage induction motor has minimum starting torque.
16. In this cage motor, speed can not be easily controlled.
17. It has a high starting current.
18. Few chances to improve the power factor.
19. The squirrel cage induction motor has more sensitivity while fluctuation occurs in supply voltage.

I have covered all the basic pros and cons of the squirrel cage induction motor as compared to the slip ring induction motor.

Read more details: the difference between squirrel cage and slip ring induction motor with considering basic specifications.

If you have any queries related to the benefits and drawbacks of cage motors, please give comments.

Thanks for Reading!

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