As we know, today’s world is growing at very fast pace, keeping in mind of various technological innovations and the basic requirements for all such innovations brings my focus to Electrical Energy.
For all such actions available to a common man, the availability of minimum & sufficient supply of electrical energy to each is essential. So for this entire let us have a basic knowledge of Electrical Machines and the very important work done by magnetic field which made this a possibility and not a dream.
The key point is
“Why we use Magnetic field only as a medium of conversion in the design of electrical machines”
Take an example of Transformer –a static, non linear device used to change the voltage levels at a constant frequency. Under normal operating level voltages, electric field strength developed will be very weak. In contrary even by having very less magnitude of current, we can develop a strong magnetic field by increasing number of turns. Maximum allowed energy density for air with respect to magnetic field is more compared to electric field. In other words we can say that for a given power rating, the size of machine, volume of material requirement and the cost of machine will be less with magnetic field compared to electric field.
By the study of various experiments carried out by famous scientists like Oersted, Ampere and Faraday’s the use of magnetic field in electric machines and its behavior characteristics were made clear to us, for example by Oersted’s experiment the generation of magnetic field by passage of electric current .Next Ampere’s experiment which gave us knowledge about the direct proportionality of magnetic field or flux to the current if and only if system is linear. Finally the Faraday’s law which thoroughly explained the induction of EMF by a changing flux that brought about a revolution in the electrical engineering.
So let us face the reality , a lot has been done in the field of electrical engineering and a lot is yet to be achieved and meet the requirements .A little step by all the members of electrical fraternity and also by all those who uses it can change the present scenario of Electrical Energy generation and requirement.