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Question

# A 4-pole, 50Hz alternator has double layer winding with 10 turns per coil and number of slots are 60. If each coil is short pitched by an angle of 36∘ electrical. The fundamental flux per pole is 0.015 Wb. The line to line induced emf for a 3-phase star connection is approximately

A
1050.2V
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B
350.14 V
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C
606.33V
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D
1818.9V
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Solution

## The correct option is A 1050.2VFor double layer winding, No. of slots = No. of coils Total number of turns = 60×10=600 Turns per phase = 6003=200 Pitch factor (Kc)=cos180=0.951 Distribution factor (Kd)=sinmβ2msinβ2 m=604×13=5 β=18060/4=120 Kd=sin5×1225sin122=0.9567 Eph=√2πKωϕfTph Eph=√2π×0.9567×0.951×0.015×50×200 Eph=606.33V EL−L=√3×606.33V EL−L=1.05kV

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