What Is Working Of An Alternator

What Is Working Of An Alternator


Alternator: According to Friday law, if a conductor is moved in the magnetic field and it cuts the magnetic lines of force, then an EMF induced in it. the magnitude of induced EMF depends on the rate of change of the flux or the velocity at which the conductor is rotated in the magnetic field. In figure shows a simple generator consisting of a single rectangular loop abcd connected to two metallic rings x & y. Two carbon brushes make a sliding contact which is connected to the load.


How To Working Of Alternator

The contractor loop is rotating in an anticlockwise direction in the magnetic such that conductor AB rises upwards while the CD goes downwards. The direction of EMF in which conductor is determined by 'Fleming's right-hand rule', which is from b to a and d to c. when the loop is perpendicular to the field, then maximum EMF is induced in it. and when the loop is parallel to the field, then maximum EMF is induced in it .the different position of the loop are shown in the figure.



When the conductor a b near to the North Pole, then the direction of current in this conductor is from b to a, But, when it is near to the South pole, then the direction of current is from a to b. In this way, the current produced is of alternating nature.
If one conductor of the loop is at the right angle to the field, then the induced e.m.f. is given by-
e=B.I.v.
But, if the conductor is making an angle of @ with the field, then the induced e.m.f. is given by-
e=B.I.v.sin@
And, if the conductor is parallel to the flux, then the induced e.m.f. is zero, because of sin@=0.


  • What Is Flemings Right Hand Rule

Fleming right-Hand Rule- If the thumb, forefinger and middle finger of the right round are stretched perpendicular to each other, and the thumb points the direction of motion of the conductor, fore-finger points the direction of the flux then the middle fingers will point the direction of e.m.f. induced in the conductor.

figure-

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