Categories Alternators Machine

# Working Principle of Alternator

An alternator is an electrical apparatus which converts mechanical energy into alternating electric energy. They are also called as synchronous generators.working principle of alternator Accordingly, Faraday’s Laws of Electromagnetic Induction, the e.m.f. induced in the twine is given by the rate of change of flux linkage of the coil.

## Working Principle of Alternator:

An alternators (as they are generally called) move on the same basic morals of electromagnetic induction as D.C. generators. the swiftness at which the coil or magnetic field rotates.

### working:

Consider a rectangular coil having N turns and rotating in a similar magnetic field with an angular velocity of w radian/second. Maximum flux Øm is connected with the coil when its plane be gathered with the X-axis. In time t seconds, this coil rotates with an angle q = wt. In this alter position, the element of the flux which is perpendicular to the plane of the coil is Ø= Øcos wt. Hence flux linkage analysis at any time is NØ=NØcos wt.

Accordingly, Faraday’s Laws of Electromagnetic Induction, the e.m.f. induced in the twine is given by the rate of change of flux linkage of the coil. Since the value of the founded e.m.f. is

e = – d(NØ)/dt volt

= – Nd(Øcos wt)/dt volt

= – NØw(-sin wt) volt

= wNØsin wt volt

= w NØsin q volt   ———————–   (i)

When the coil turned through 90º i.e. when q = 90º, then sin q = 1, since e has maximum value, say Em.from  Eq(i) we get,

Em = wNØ

= w NBmA = 2pfNBmA volt

where          Bm = maximum flux density in Wb/m2.

A = Area of the coil in m2.

f  = frequency of turning of the coil in rev/second.

Substituting this value of Em in Equation(i), we get

e =Esin q = Esin wt

Similarly, the induced alternating current is

i = Isin wt

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Working Principle of Alternator
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An alternator is an electrical apparatus which converts mechanical energy into alternating electric energy. The working principle of alternator accordingly, Faraday's Laws of Electromagnetic Induction, the e.m.f. induced in the twine,,
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Habib
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