Synchronous Motor

What is Rotating Magnetic Field ? - how it is produced

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…

Synchronous Motor - Working, Applications & Advantages

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 m…

Phasor Diagram & Back EMF of Synchronous Motor

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 Î± for various factors. Analysis of Phasor Diagram Under Normal Conditions : Let, V = Sup…

Working Principle of a Synchronous Motor

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 beca…

Synchronous Motor Excitation - Over, Under & Normal Excitation

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 in…

Effect of Load on a Synchronous Motor - its Behaviour

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 arma…

What is Synchronous Reactance & Synchronous Impedance ?

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 …