13/09/  · Classification of Squirrel Cage Induction Motor. National Electrical Manufacturer’s Association in the United States and IEC in Europe have classified the design of the squirrel cage induction motors based on their speed-torque characteristics into some classes. These classes are Class A, Class B, Class C, Class D, Class E, and Class F.

A squirrel-cage motor with this type of rotor construction is called NEMAdesign class D. Its torque-speed characteristic is also shown in Figure 7-26. Deep-Barand Double-Cage RotorDesigns, Both of the previous rotor designs are essentially similar to a wound-rotor motor with a set rotor resistance.

The construction of squirrel cage induction simple and rugged. Construction of slip ring induction motors needs slip rings, brushes, short-circuiting device, etc. This type of motor has less overhang and better space factor in slots. These motors have the highest overhang and poor space factor in slots. Cost and maintenance are less.

Squirrel cage induction motors have mostly been used for their small capacity because the starting torque is smaller than the starting current during start-up.

I. INTRODUCTION The induction motor torque-speed characteristic gives information on the dependence of induced mechanical torque on mechanical speed. Sometimes this characteristic is called torque-slip characteristic, where slip is defined as speed relative to synchronous speed expressed as a fraction of synchronous speed. ,

current versus speed characteristics, Torque-speed characteristics squirrel cage induction motors according to the lamination of the rotor [1].

The squirrel cage induction motor uses a magnetic field to drive a rotor. Its induced voltage is one to three percent higher than the synchronous speed of a magnetic field. This difference in speed is called "motor slip." A squirrel cage induction motor is not a loss-free motor, and the current it produces is not loss-free.

The torque-slip characteristics show how the torque changes with a change in slip. The slip is defined as a ratio of synchronous speed and the actual speed of 

The principal advantages of the squirrel-cage induction motor are its simplicity of design and robust construction. Its torque/speed and current/speed characteristics are such that, on

05/07/  · The torque-speed characteristics of a three-phase induction motor is a straight line between the no-load and full-load operating points. The slope of the curve line depends upon the resistance of the rotor circuit i.e. the higher the rotor circuit resistance, the sharper the slope of the curve. The small three-phase induction motors (below 10

The motoring region of the induction machine torque-speed curve is the region of greatest interest. The plots below show a number of different torque speed 

Starting Characteristics of Squirrel Cage Induction Motors. Soft start is also available using solid-state controls. Consult manufacturer for voltage, current and torque rating. *Autotransformer magnetizing current not included. Magnetizing current is usually less than 25 percent of motor full-load current.

In a double-cage induction motor, it is assumed that the two cages develop two separate torques. Thus, the total torque developed in the double-cage induction motor is equal to the sum of the two cage torques. The torque-slip characteristics of the two cages and the total torque of the motor is shown in the figure.

Score: 4.8/5 (32 votes) . A 3 phase squirrel cage induction motor is a type of three phase induction motor which functions based on the principle of electromagnetism. It is called a 'squirrel cage' motor because the rotor inside of it - known as a 'squirrel cage rotor' - looks like a squirrel cage.

Initialize a three-phase induction motor as part of a load flow analysis. When initializing an induction machine that is directly connected to an AC network, in steady state there is one degree of freedom which can be set by any one of shaft torque, shaft power, motor speed or electrical power.

At starting of the motor, frequency of induced emf is high because of large slip (slip = frequency of rotor emf / supply frequency). Hence the reactance of 

One of the important features of an induction motor is its torque speed characteristics for both the squirrel cage and wound rotor type induction motors 

19/08/  · Classification of Squirrel Cage Induction Motor. NEMA (National Electrical Manufacturer’s Association) in United States and IEC in Europe has classified the design of the

Keywords: Induction motor, speed-torque curve, induction machine;. 1. Introduction. Squirrel-cage three-phase induction motors are widely used for most 

The important characteristics normally shown by a squirrel cage induction motors are crawling and cogging.

27/09/  · This video describes the Torque - Slip / Torque- Speed Characteristics of three phase squirrel cage induction motor and slip ring induction motor- also describ