The Two Winding DC Machine shown in the figure above can be described by the following equations:
The effective induced voltage or the effective back emf, Ef_e, at any given speed can be derived from the Open Circuit Voltage Characteristics and the Armature Reaction data.
NOTE: The variation and of La and Lf were not considered. Test results compared with simulations showed that neglecting this does not have a significant effect on the accuracy.
The electro-mechanical torque, Te, developed by the machine is given by:
Te in per unit is available as an output from the model. This signal can be used as an input to the Multi-Mass Torsional Shaft Interface component to calculate the mechanical speed of the rotor.
