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 Ø_m 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= Ø_m cos wt. Hence flux linkage analysis at any time is NØ=NØ_m cos 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(Ø_m cos wt)/dt volt

                                                          = – NØ_m w(-sin wt) volt

                                                          = wNØ_m sin wt volt

                                                           = w NØ_m sin q volt   ———————–   (i)

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

                                                                E_m = wNØ_m 

                                                                                   = w NB_mA = 2pfNB_mA volt

                                             where          B_m = 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 E_m in Equation(i), we get

                                                               e =E_m sin q = E_m sin wt

                                Similarly, the induced alternating current is

                                                               i = I_m  sin 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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