Shunt Generator

       When the field winding is connected in parallel with the armature and the combination across the load then the generator is called shunt generator.

       The field winding has large number of turns of thin wire so it has high resistance. Let R_sh be the resistance of the field winding.

Fig. 1 Shunt generator

1.1 Voltage and Current Relations

       From the Fig. 1, we can write

          I_a = I_L + I_sh

       Now voltage across load is V_t which is same across field winding as both are in parallel with each other.

.^..          I_sh = V_t /R_sh

       While induced e.m.f. E, still requires to supply voltage drop I_a R_a and brush contact drop.

.^..          E = V_t + I_a R_a + V_brush

Where    E = (ΦPNZ)/(60A)

       In practical, brush contact drop can be neglected.