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…

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