What is Blocked Rotor Test of Induction Motor ?

Blocked rotor test, it is quite opposite to the no-load test of the induction motor. Usually in transformer tests, if we want to find the behavior of a transformer on loading and on no-load, it can be done by using open ci…

What is Ideal Transformer ? - Phasor Diagram & Model

What is Ideal Transformer ?      An ideal transformer is one that has no losses i.e., its windings have no resistance, there is no magnetic leakage, and hence which has no iron and copper losses. It may, however, be noted t…

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…

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