# What is double squirrel cage induction motor?

## 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.

## Why is the speed of the squirrel cage motor fixed?

Because the speed variation from no load to full load is very small, the term ‘fixed’ speed is widely used. The generator is coupled to the wind turbine rotor via a gearbox as shown in Fig. 6.4.

## What is the formula for the slip of three-phase squirrel cage induction motor?

Explanation: Slip speed = Synchronous speed – Rotor speed = Ns -N. Slip, s = (Ns – N) / Ns.

## What is the power factor of a squirrel cage induction motor?

Explanation: At light loads, the current drawn is largely a magnetizing current due to the air gap and hence the power factor is low. The power factor of a squirrel cage induction motor generally is . 6-. 8.

## What is the output equation of an induction motor?

output equation is the mathematical expression which gives the relation between the various physical and electrical parameters of the electrical machine.

## Why is it called squirrel cage?

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.

## How do you control the speed of a squirrel cage motor?

The above three methods are most commonly used for the speed control of squirrel cage Induction motors. Changing Applied Voltage: This method, even though easiest, it is rarely used….Speed Control of Induction Motors:

1. Changing Applied Voltage.
2. Changing Applied Frequency.
3. Changing Number Of Stator Poles.

## How does a squirrel cage induction motor work?

Squirrel cage motors are a subclass of induction motors, which harness electromagnetism to generate motion. The AC current passed through the stator creates an EMF that fluctuates with the AC frequency, which “rotates” around the rotor, inducing opposing magnetic fields in the rotor bars, thus causing motion.

## 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 cage induction motor?

A 3 phase squirrel cage induction motor is a type of three phase induction motor which functions based on the principle of electromagnetism. The interaction of the magnetic fields produced by the stator and rotor windings produces a torque on the squirrel cage rotor.

## What is the formula of slip in induction motor?

Slip speed is the speed difference between the Synchronous speed and Rotor speed. Slip speed = Synchronous speed – Rotor speed = Ns -N. Slip, s = (Ns – N) / Ns.

## What is a squirrel cage?

The name “squirrel cage” originated from the shape of their rotor, where the internal component is connected to the output shaft and looks like a cage. The squirrel-cage rotor is the rotating component of the squirrel-cage induction motor. It has a steel collar cylinder with copper or aluminum conductors implanted on its surface.

## What is a squirrel cage induction generator?

High efficiency

• Small and lightweight
• Due to an absence of brushes,the chances of spark are reduced.
• These motors are provided with fans,so less heat is generated.
• Squirrel cage motors operate at nearly constant speed,high overload capacity,and operates at better power factor.
• ## What is squirrel cage motor?

– In the slip ring type,the rotor consists of three phase winding similar to that of the stator winding. – In slip ring type, resistance can be added externally. In squirrel cage type, external resistance addition is not possible as the rotor is permanently shorted by the end rings. – In slip ring type,high starting torque can be obtained.

## What is squirrel cage rotor?

– It reduces noise and vibration – It gives smooth operation – It increases starting torque and reduces starting current.