Elec467 Power Machines & Transformers Electric Machines by Hubert, Chapter 12 Topic: Self-excited and compound generators, load distribution.

Self-excited shunt generator

Changing the output voltage

Flux and current relationship There is a incorrect connection in one of the above drawings. Which one is it? Examine the circuits using the right-hand rule for current flow.

Short on the output

Compensating windings Compensating winding are the stator coils wired to a separate DC source.

Magnetization curve

Adding a series inductor to a self-excited generator

Motor design considerations

Effect of adding a resistor to the series inductor of a self-excited generator 1.Adding a series inductor will increase the current flow. 2.Adding a resistor across the series inductor will change the rate at which the generator increase the current.

Protection circuit prevents current reversal