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##### 7.15 Solved Numerical Problems

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* Example 7.2* A four-pole dc generator having wave-wound armature winding has 51 slots, each slot containing 20 conductors. Calculate the voltage generated in the armature when driven at 1500 rpm. Assume flux per pole to be 0.5 mWb.

**Solution:**

P = 4, A = 2 (because the armature winding is wave wound)

N = 1500 rpm

Total number of armature conductors, Z = 20 × 51

= 1020

Equation for induced EMF,

Substituting values

= 255 V

* Example 7.3* 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.

**Solution:**

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

* Example 7.4* A four-pole 220 V dc shunt generator supplies a load of 3 kW at 220 V. The resistance of the armature winding is 0.1 O and that of the field winding is 110 O. Calculate the total armature current, the current flowing through armature conductors, and the EMF induced. Assume that the armature winding is wave wound.