When a magnet or magnetic pole ( coil or winding ) is rotated, the magnetic field or flux of constant amplitude produced by the magnet or poles will be a rotating magnetic field. But in this case, an external physical force is ne…
An electric motor is a device that converts electrical energy into mechanical energy. The motors can operate on dc or ac (single-phase as well as three-phase) supply. In fact, as ac supply is very commonly available, ac motors ar…
In this article let us draw the phasor diagram of synchronous motor and also derive the expression for back emf E b and load angle α for various factors. Analysis of Phasor Diagram Under Normal Conditions : Let, V = Supply vol…
A device that converts electrical energy into mechanical energy running at synchronous speed (or constant speed) is called Synchronous Motor. Its speed is constant irrespective of load. It is a doubly excited machine because its …
In the last article, we have seen the behavior of synchronous on loading i.e, by varying load on the motor. For a constant field excitation, when the load on the synchronous motor increases the current drawn by the motor increase…
Basically, when the load is increased on the dc motor, the speed of the motor reduces. In the dc motor, armature develops an emf which opposes the supply voltage V called back emf E b . The resultant voltage across the armature c…
When an alternator is loaded, there will be a circulation of load current in the armature winding. Once the load on the alternator is increased, the terminal voltage changes (for constant excitation) due to the following reasons,…
