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 it has no iron and copper losses. It may, however, be noted that it is impo…
As we know that most electrical power plants are located far away from the load centers. Because the electrical energy generated by thermal and hydro or any other power plants are located at a distance from the consumers. To tran…
Necessity of Starting a Three-phase Induction Motor : In a 3-phase Induction motor, the magnitude of rotor induced emf depends upon slip. The equation for Rotor current of induction motor is given by, At starting, the magnitud…
As we know that a single-phase induction motor is not a self-starting motor. In order to make it self starting, changes are to be done to the construction. Let us see the construction and working principle of the shaded pole indu…
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 indeterminate and i…
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 angle Φ = Power factor angle. Input Power …
We know that in a synchronous generator or alternator when the conductors of the rotor cuts the alternating magnetic flux lines produced by the stator or field winding an EMF will induce in the rotor conductors (according to the …
