Articles on Induction motor


Single Phase Induction Motor :


Single phase induction motor

The construction of a single phase induction motor Is very similar to that of a 3 phase induction motor.....


Types of single phase induction motors

Single phase motors are classified according to the methods of starting used for them.....


Losses in Induction motor

The losses in an induction motor can be classified as.....


Double Revolving Field Theory

An alternating field produced by the stator winding can be represented by sum of two revolving fields of equal magnitude and are rotating in opposite.....


Cross-field Theory of Single phase Induction Motor

Consider a single-phase induction motor having a single-phase winding on the stator. The rotor is squirrel cage type. When a single-phase.....


Phasor Diagram of Induction Motor

The induction motor  like a transformer is singly energized device. The stator and rotor of an induction motor can be compared to.....


Torque Equation of Induction Motor

The Torque, T of an induction motor is proportional to the product of stator flux per pole (φ), rotor current (I) and the power factor of the.....


Maximum Torque of Induction Motor

We know the equation for torque from Torque equation of induction motor.....


Circle diagram is a graphical method to analyse the performance of a 3-phase induction motor. Although it is.....


The equivalent circuit of an induction motor is similar to a transformer equivalent circuit because the energy is transferred from stator to rotor is.....


This test is similar to the No-Load test on a transformer. The purpose of this test is to determine the no-load losses, no-load power factor and.....


This test is similar to short circuit test on a Transformer. The purpose of   this is to determine the total resistance ( R01 ) and reactance ( X01 ) of.....


The relation between synchronous speed, supply frequency and the number of stator poles is given by.....


As the rotor rotating, the magnitude of rotor induced emf ( proportional to relative speed between stator rotating field and rotor speed ) is.....


Induction motor converts an electrical power supplied to it into mechanical power. The various stages in this conversion is called as power.....


The curve obtained by plotting torque against slip is called torque-slip characteristics of the induction motor.....



Three Phase Induction Motor :


Stator construction is similar to the stator of a synchronous machine. The stator  consists of Stator core, Stator frame and Stator winding.....


A 3-phase induction motor is a constant speed motor just like a D.C shunt motor. However, speed of induction can be varied.....


At start, the magnitude of rotor induced emf is maximum as slip. This emf circulates very high current through the rotor. The induction motor acts.....


The various types of starters used for starting 3-phase induction motor are Full Voltage Starting :
(i). Direct on line (D.O.L) starter.....


The starting torque in a squirrel cage motor is small because of its low rotor resistance and there is no way to insert external resistance as the.....


The majority of the induction machines used today are operated as induction motors. Use of induction machines as induction generators.....




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