DC Shunt Generator

A DC Shunt generator uses self-excitation for the production of necessary magnetic field. In such self-excited the machines they use the current generated in the armature itself to excite the field coils. They have no need of external DC sources to power the field coils.

In shunt generator the field winding is placed across
or in parallel with armature conductors and hence the voltage across the field winding will be equal to the generator voltage. The terminal voltage for the shunt generator is almost constant and can be controlled by using field regulators.

Circuit Diagram of DC Shunt generator:

The given below figure shows the circuit diagram of a DC shunt generator.

DC Shunt Generator

Here E_g indicates the generated voltage in armature conductors and V is the terminal voltage of the generator.

Equations For DC Shunt Generator:

If R_a is the internal resistance of the armature conductors and the R_sh is the internal resistance of shunt field winding then the terminal voltage can be obtained as,
V=E_g-I_aR_a

The Current through the field winding I_sh is given as,
I_sh=V/R_sh