No Load Test of Induction Motor

This test is similar to the no-load test performed on a transformer. The purpose of this test is to determine the no-load losses , no-load power factor, and constants  R o  and  X o  of the equivalent circuit.      The no…

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 rotor. The torque of an induction motor is due to the interaction of the…

Permanent Magnet Stepper Motor - Construction & Working

A stepper motor is an electro-mechanical device that actuates a train of step movements of a shaft in response to a train of input pulses. The step movement may be angular or linear. The step movement of the motor is acc…

Ac Series Motor - Construction & Principle of Operation

Principle of Operation of A.C. Series Motor :       An ordinary d.c.series motor will run in the same direction regardless of the polarity of the supply. The direction of the torque depends upon the relative directions in s…

Cross-field Theory of Single phase Induction Motor

It is interesting to know how a single-phase induction motor can able to rotate when an initial rotation or starting torque is given to it. This can understand with the help of cross-field theory and double-revolving fiel…

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