Teaching lab on the DSP implementation of the speed control of a DC machine

Abstract

The present paper addresses the speed control of a DC machine in the context of an advanced teaching lab consisting in setting up an islanded production unit. The different steps followed by the student to design and implement the speed control of the DC machine used in this islanded production unit are explained. A hardware specifically designed for this teaching and consisting of a DSP and an Analog to Digital (A/D) converter is presented. The major steps for the design of the PI (Proportional-Integral) regulator are recalled, whereas different improvement techniques such as the Anti-Reset Windup (ARW) or the set value corrector are presented in details. The corresponding code implemented in a DSP is given and detailed. Different tests performed on the test bench are then discussed mainly in terms of response time and overshoot.