Page 659 - Basic Electrical Engineering

Therefore,

Example 7.13 A dc shunt machine connected to 220 V supply has armature

resistance of 0.1 Ω and field resistance of 110 Ω. Find the ratio of the speed
of the machine working as a generator to the speed of the machine when

working as a motor when the line current is 100 A in both the cases.

Solution:

Figure 7.33

As a generator, the machine will supply 100 A to the supply mains.

I = I + I = 2 + 100 = 102 A
a
f
L
Output voltage = 220 V.

E = V + I R = 220 +102 × 0.1 = 230.2 V
g
a
a