Question 4.3: A six-pole, lap-connected dc generator has a total of 650 co...

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 armature is to be driven to generate an EMF of 220 V.

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P = 6, A = P = 6 (because the armature winding is lap connected)

Φ = 0.05 Wb; E = 220 V
Z = 650, N = ?

E= \frac{ΦZNP}{60A} 

Substituting values

220 = \frac{0.05  ×  650  ×  N  ×  6}{60  ×  6}

or,                                    N= \frac{220  ×  60}{ 650  ×  0.05} = 406 rpm

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