Speed Control of DC Series Motor - Flux & Rheostatic Control

In a dc motor, speed will depend on armature current and field voltage. So to control dc motor  speed, field voltage or armature current should be changed.      In a dc series motor or universal motor, the speed is indete…

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…

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