What is double cage induction motor?

What is the advantage of double cage induction motor?

A double cage rotor has low starting current and high starting torque, therefore, it is more suitable for direct on line starting. 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.

What is double squirrel cage induction motor?

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.

What are deep bar and double cage induction motors?

For high torque requirements, a deep bar cage induction motor is used. A double-cage induction motor is also used for high torque applications. For large size motors with very large starting torque requirement and exceptionally long starting periods, the slip-ring induction motors are used.

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Where are double cage motors used?

Application of double cage induction motor

This type of motor is particularly useful were frequent starting under heavy load is required such as rolling mills, compressors, cranes, convertors, reciprocating pumps etc.

What is the disadvantage of using double cage rotor?

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.

What type of rotor is used by a 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. The stator of a double cage rotor of an induction motor is the same as that of a normal induction motor.

Why is it called a squirrel cage 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 is an induction motor used for?

Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFD) in variable-speed service.

How does a squirrel cage induction motor work?

The field windings in the stator of an induction motor set up a rotating magnetic field through the rotor. The relative motion between this field and the rotation of the rotor induces electric current in the conductive bars.

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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 purpose of using deep bar cage rotor?

The Deep Bar Rotor in an induction motor is used to obtain high rotor resistance at starting and low rotor resistance at the running condition. A bar may be assumed to be made up of a number of narrow layers connected in parallel.

What is single cage rotor?

A squirrel-cage rotor is the rotating part of the common squirrel-cage induction motor. It consists of a cylinder of steel laminations, with aluminum or copper conductors embedded in its surface.

What is crawling in induction motor?

Detailed Solution. The crawling in the induction motor is caused by harmonics developed in motor. Crawling is the tendency of particularly squirrel cage rotor to run at speeds as low as one-seventh of their synchronous speed. This phenomenon is known as the crawling of an induction motor.

What is the speed of synchronous motor?

The synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor. It is the speed at which the electromotive force is produced by the alternating machine.

Synchronous Speed.

Number of Poles Synchronous Speed NS in r.p.m
10 600
12 500

What is equivalent circuit of induction motor?

The equivalent circuit of an induction motor is similar to a transformer equivalent circuit because the energy is transferred from stator to rotor is essential as a transformer operation from primary to the secondary winding. An equivalent circuit enables the performance characteristics of the induction motor.

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