- When the mechanical input power is given to the DC Generator, some emf and therefore current would be generated due to residual magnetism in the poles.
- This current while passing through field coils, it will strengthen the magnetism of the poles which further generates emf.
- This mutual reinforcement of field flux and emf proceeds till equilibrium condition is reached.
- The rated terminal voltage is achieved at balanced condition.
Condition must be necessary in order to build up
voltage in the generator
- There must be some residual magnetism in the poles of DC generator.
- The shunt field coils connection must be connected correctly to the armature.
- The term – correctly – means that the flux produced by the shunt field aids residual flux. This will result in build up voltage in the DC generator.
- If the direction of shunt field winding connection reverses, it will reduces net flux and therefore DC generator does not build up voltage.
- The direction of rotation of the armature must be such that the current produces by it always aids the residual flux.
- The shunt field resistance should be less than the critical resistance if it is excited to open circuit.
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