Exact Electrical Equivalent Circuit Model for Analysis of Permanent Magnet Direct Current (PMDC) Motor

In this study, the electromechanical equations of the permanent magnet direct current (PMDC) motor are examined and a fully electrical equivalent circuit model is proposed. Generally, for DC motor models, only the electrical circuit model of the armature circuit is given, and the equations of the mechanical system are used. In this study, an electrically equivalent circuit model with the same equation structure as the mechanical system is proposed. Thus, both the armature circuit and the mechanical part of a PMDC motor are expressed with electrical circuit elements and parameters. Since the proposed model is a completely electrical circuit, mechanical quantities can be analyzed with circuit simulation programs. With the analyses, the performance of the permanent magnet DC motor model was examined and the system dynamics responses were found to be compatible.