Power Flow Diagram & Power Developed by Synchronous Motor

The phasor diagram of a synchronous motor is shown below. From the phasor diagram, Let     V = Supply voltage / phase      I a   = Armature current / phase      R a   = Armature resistance / phase      α  = Load angl…

EMF Equation of a Synchronous Generator or Alternator

We know that in a synchronous generator or alternator when the conductor of the rotor cuts the alternating magnetic flux lines produced by the stator or field winding an EMF will induce in the rotor conductor ( according …

V Curves and Inverted V Curves of Synchronous Motor

The performance characteristics of a synchronous motor are obtained by v-curves and inverted v-curves. Synchronous machines have parabolic type characteristics ( the graph drawn is in the shape of parabolic ). If the exc…

Synchronous Condenser and Power Factor Correction

Synchronous Condenser ( or ) Synchronous Capacitor :      If a  synchronous motor is on no-load and over-excited ( E b   >   V  ) then the current drawn by it leads the voltage by nearly 90°. The phasor diagram of the m…

Starting Methods of Synchronous Motor

A device that converts electrical energy into mechanical energy running at synchronous speed is called  Synchronous Motor . Its speed is constant irrespective of load. It is a doubly excited machine because its field wind…

Construction Details of Synchronous Motor

As there is no constructional difference between dc generator and dc motor, similarly, there is no difference between the construction of a synchronous motor and synchronous generator ( alternator ).      The constructio…

Efficiency and Power Flow Diagram of Induction Motor

Power Transfer Stages of Induction Motor :      Induction motor converts an electrical power supplied to it into mechanical power. The various stages in this conversion is called as power transfer stages in an induct…

Induction Motor Applications

Most of the motors used for household and commercial purposes are induction motors. The use of an induction motor as induction generators is insignificant. An induction motor has nearly constant speed motor characteristic…

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…

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