I am New to electronics and electrical field. So to start with, I am trying to make 1/10th energy consumption fan compared to a BLDC Fan.
You say you want to reduce fan power consumption by 90%? No problem. Nothing simpler. Make it BIG -- and SLOW.
The cooling potential of a stream of air is proportional to its mass = density x area x velocity, but its kinetic energy, and therefore the power required to accelerate it, is proportional to velocity squared. Therefore, to cut power by 10x while maintaining the same cooling potential, simply cut velocity by square_root(10) = 3.162 while holding mass constant, which you can accomplish by increasing area by the same factor.
That is to say, since area is proportional to diameter squared, just increase fan diameter by square_root(square_root(10)) = 1.778.
Done! Now just start cranking out your energy-saving mega-jumbo fans and collect your fortune. I will, of course, expect a fair royalty.
Say 90%?
Ain't physics grand?