Frequent question: How does double cage induction motor differ from single cage induction motor?

As compare to double cage rotor, the single cage has less starting torque so at starting less heating loss occur. A double cage motor develops higher starting torque for low starting current and its rotor heating loss is more. Full load slip is higher than double cage rotor. It has higher efficiency.

What is the difference between a double cage and deep cage induction motor?

Comparison between Single Cage and Double Cage Motors

Since effective rotor resistance of double cage motor is higher, there is larger rotor heating at the time of starting as compared to that of single cage rotor. The high resistance of the outer cage increases the resistance of double cage motor.

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How does a double squirrel cage induction motor operate?

Rotor of a double squirrel cage motor has two independent cages on the same rotor. The figure at left shows the cross sectional diagram of a double squirrel cage rotor. Bars of high resistance and low reactance are placed in the outer cage, and bars of low resistance and high reactance are placed in the inner cage.

What is the advantage of double squirrel cage induction motor?

It has high efficiency and good speed regulation. It gives higher starting torque. Lower starting current and are cheaper in cost. They are more robust and are explosion proof since the risk of sparking is eliminated by the absence of slip ring and brushes.

What is double cage induction motor?

A Double Cage Induction motor is that type of motor in which a double cage or two rotor windings or cages are used. This arrangement is used for obtaining high starting torque at a low value of starting current. … In the double cage rotor of an induction motor, there are two layers of the bars.

What is cogging and crawling?

The important characteristics normally shown by a squirrel cage induction motors are crawling and cogging. These characteristics are the result of improper functioning of the motor that means either motor is running at very slow speed or it is not taking the load.

At what condition the skin effect in deep bar induction motor will be maximum?

The skin effect in a deep bar induction motor is maximum when rotor is at standstill.

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What is difference between squirrel cage and induction motor?

Key Differences Between Slip Ring & Squirrel Cage Induction Motor. The motor whose rotor is wound type such type of motor is called slip ring induction motor, whereas the squirrel cage motor, has a squirrel cage type rotor. … The starting torque of the slip-ring motor is high, whereas in squirrel cage motor it is low.

Why it is called squirrel cage induction motor?

Squirrel cage motors are a subclass of induction motors, which harness electromagnetism to generate motion. They are so-called “squirrel cage” motors because the shape of their rotor – the inner component connected to the output shaft – looks like a cage.

What are advantages of cage motors?

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.

Why the starting torque of squirrel cage induction motor is low?

It suffers from the disadvantage of a low starting torque. It is because the rotor bars are permanently short-circuited and it is not possible to add any external resistance to the rotor circuit to have a large starting torque.

What are the advantages and disadvantages of slip ring induction motor over squirrel cage induction motor?

Induction motors generally will have low starting torque compared to dc series motor. Slip ring induction motor have big advantage of having high starting torque compared to squirrel cage motor. Therefore slip ring induction motors are generally employed where load requires high starting torque or good speed control.

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What are the merits and demerits of double cage induction motor?

A double cage motor develops higher starting torque for low starting current and its rotor heating loss is more. Full load slip is higher than double cage rotor. It has higher efficiency. Slip and efficiency are lower than the single cage rotor.

What is the advantage of double cage?

The advantage of a double-squirrel cage motor is that it provides high starting torque and low starting current. How does a double-squirrel cage induction motor operate (i) at starting (ii) under running conditions ? A double-squirrel cage motor has two rotor windings, one inside the other.

What are the types of 3 phase induction motor?

Depending upon the type of rotor used the three-phase induction motor is classified as:

  • Squirrel Cage Induction Motor.
  • Slip Ring Induction Motor or Wound Rotor Induction Motor or Phase Wound Induction Motor.


What is the use of circle diagram in induction motor?

What is a Circle Diagram. A circle diagram is a graphical representation of the performance of an electrical machine. It is commonly used to illustrate the performance of transformers, alternators, synchronous motors, and induction motors.