DC Motor Speed Control via a DC to DC Buck Power Converter

This paper presents a hierarchical control system designed for permanent DC motor powered by a DC/DC Buck converter. Hierarchical controller based on differential flatness property of the plant system is meant to control the angular speed for tracking trajectories applications. This controller provides the voltage profiles that have to be tracked by the Buck converter and consequently a low hierarchy controller is designed to ensure the aforementioned. The low hierarchy controller goal is accomplished by using another control law based on differential flatness that controls the Buck converter. The contribution is validated through numerical simulations.

I. Introduction

In the field of power-electronics, both servo-amplifiers and servo-controllers are ubiquitous technologies since these servo-systems are used in many applications, for instance, industrial robots, appliances or even electric cars. A fundamental part of an electronic servo-system is the power converter. Most of the existing techniques for optimizing this stage are still an active research area. Particularly, the use a of Buck type switched DC/DC converter for power supplying electric motors is widely spread along this field [1]. A number of different proposals where the combination of DC to DC power converters with DC motors have been reported.