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How To Flashing karbonn quattro l52 vr
alternators are the workhorse of the powergeneration industry. it is capable to generate ac power at aspecified frequency. it is also called as synchronousgenerator. electricity is produced in alternatorsby electromagnetic induction. to generate electricity in a coil, either the coil should rotate with respect to magnetic field or a magnetic field should rotate withrespect to the coil. in the case of alternator the latterapproach is used. rotor and armature coils are the two mainparts of an alternator.
the rotor produces a rotating magnetic flux. armature coils are stationary and rotating magnetic flux associatedwith the rotor induces electricity in the armaturecoils. this kind of rotor shown here is known assalient pole rotor. for gaining better insight of its working let's consider a rotor with just four poles 'rotor coils are excited with a dc power source. magnetic field produced around it wouldbe a shown.
the rotor is made to rotate by a primemover. this makes the rotor flux also rotatealong with it, at the same speed . such a revolving magnetic flux now intersects armature coils, which is fitted around the rotor. this will generate an alternating emf across the winding. here is a slowed down version of the
rotor stator interaction. for this four pole system when the rotor turns half revolution, induced emf takes one complete cycle. it can be easily established that,frequency of induce emf, rotor speed and number of poles are connected through following relationship: it is clear here that, frequency electricity produced is synchronized
with mechanical rotational speed. for producing 3 phase ac current, two more such armature coils which are in 120 degree phase difference with the first is put in the stator winding. generally one end of these threecoils are star connected, and three phase electricity is drawnfrom the other ends. it is clear from this equation that, in order to produce 60-hertz electricity
a 4-pole rotor should run at following rpm. such huge rpm will induce a tremendouscentrifugal force on polls of the rotor, and it may fail mechanically over the time. so salient polel rotors are generallyhaving 10 to 20 polls, which demands lower rpm. or salient pole rotors are used when the prime mover rotates at relatively lower rpm. pole core is used to effectively transfer the magnetic flux,
and they're made with fairly thick steel lamina. such insulated lamina reduce energyloss due to eddy current formation. armature winding of three-phase, 12 poll system is shown here. a stator core is used to enhance the magnetic flux transfer. dc current is supplied to rotor via apair of slip rings. dc current is supplied from an external source or from a small dc generator which is fitted on the same prime mover.
such alternators are called self excited. with variation of load, generator terminal output voltage will vary. it is desired to keep the terminal voltage in a specified limit an automatic voltage regulator helps inachieving this. voltage regulation can be easilyachieved by controlling the field current. if the terminal voltage is below the desiredlimit,
avr increases the field current, thus the field strength. this will result in an increase interminal voltage. if terminal voltage is high, the reverse is done. we hope you had a nice introduction on the working of alternators. thank you !
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