DC motor equivalent circuit model and very Basic power converter.

A DC Mootor model is made by The following equations V= R I + kw + L dI/dt (armature equation) KI - T = J dw/dt + bw (mechanical equation). By seeing the speed as a fictious current The previous equations becomes the model of a circuit with two emf generator driven by The currents and a cross coupling between the armature and the mechanical equations. The secondary current, in this way, represents the motor speed. The secondary generator is used to model the load torque. During start up the torque is high due To armature over current, when the voltage is disconnected the motor brakes by its inertia or faster if there is a mechanical load on the motor shaft. In this case a very Basic power converter (half wave rectifier and free wheeling diode is used in). The speed unity is rad/s, not rpm.

published 7 years ago