Question III.5: (a) Explain the different methods of winding of a dc machine...
(a) Explain the different methods of winding of a dc machine and compare them with the help of suitable diagrams.
(b) A six pole, lap connected dc generator has a total of 650 conductors. The flux per pole is 0.05 Wb. Calculate the speed at which the generator has to be driven to generate an EMF of 220 V.
(a) Refer to Sections 7.2.3 and 7.2.4 on Pages 7.8–7.10.
(b) P = 6, A = P = 6 (because the armature winding is lap connected)
Φ = 0.05 Wb; E = 220 V
Z = 650, N = ?
E=\frac{\phi Z N P}{60 A}Substituting values,
220 =\frac{0.05 \times 650 \times N \times 6}{60 \times 6}or, N =\frac{220 \times 60}{650 \times 0.05}=406 rpm.
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