Abstract

PSPICE is an electric circuit simulation software package. A free version of PSPICE is provided to students and professors. The library of devices used in this paper is included with this version of PSPICE. This paper introduces a complete model of the shunt DC motor for the investigation of its transient response and presents the application of the model in teaching the behavior of the shunt DC motor in an Electrical Machines course to facilitate a more thorough understanding of the topic by students. This model is introduced to students in the laboratory portion of the Electric Machines course and is used to describe the transient behavior of a practical shunt DC motor. The model uses a novel circuit which allows one to get a voltage proportional to the product of two currents in a circuit. The effects of (1) adding resistance in the field winding, (2) adding resistance in the armature winding, and (3) decreasing the load torque are investigated both separately and simultaneously using the equivalent circuit.