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Working of 3-Phase Alternator

Working of 3-Phase Alternator

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  • The rotor winding is stimulated from the dc. exciter and alternate N and S posts are created on the rotor.

  • At the point when the rotor is turned the anticlockwise way by a prime mover, the stator or armature conductors are cut by the attractive transition of rotor posts.

  • Therefore, e.m.f. is initiated in the armature conductors because of electromagnetic acceptance.

  • The actuated e.m.f. is substituting since N and S posts of rotor alternately pass the armature conductors.

  • The heading of instigated c.m.f. can be found by Fleming's correct hand guideline and recurrence is given by ;



N = speed of the rotor in r.p.m.

P = number of rotor poles

[caption id="attachment_1018" align="alignnone" width="3356"]Working of 3-Phase Alternator  Working of 3-Phase Alternator[/caption]

  • Fig. 22.4 (1) demonstrates star-adjusted armature winding and d.c. field winding.

  • At the point when the rotor is turned, a 3-stage voltage is prompted in the armature winding.

  • The size of Induced e.m.f. relies on the speed of the pivot and the d.c. energizing current.

  • The greatness of e.m.f. in each period of the armature winding is the equivalent.

  • Nonetheless, they vary in stage by 120° electrical as appeared in the phasor chart in Fig. 22.4 (ii).

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