Electromechanical analogies of a separately excited D-C machine

The method of electromechanical analogies is now well established, the three types being the direct analogy, the inverse analogy, and the frequency analogy. This paper reviews the first two methods and applies them to the transient analysis of the separately excited d-c machine. The equivalent circuits developed allow for motion of the stator and permit the analysis of vibration problems. Reference is made to the introduction of initial conditions.