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Mathematical Problems in Engineering
Volume 2013, Article ID 929316, 11 pages
http://dx.doi.org/10.1155/2013/929316
Research Article

Two-Stage Control Design of a Buck Converter/DC Motor System without Velocity Measurements via a -Modulator

1Instituto Politécnico Nacional, CIDETEC, Área de Mecatrónica, Unidad Profesional Adolfo López Mateos, 07700 México, DF, Mexico
2Universidad Autónoma de Querétaro, Facultad de Ingeniería, 76150 Querétaro, QRO, Mexico
3Instituto Politécnico Nacional, UPIICSA, Sección de Estudios de Posgrado e Investigación, 08400 México, DF, Mexico
4Instituto Tecnológico de Culiacán, Departamento de Metal-Mecánica, 80220 Culiacán, SIN, Mexico

Received 14 February 2013; Accepted 7 April 2013

Academic Editor: Ebrahim Momoniat

Copyright © 2013 R. Silva-Ortigoza et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents a two-stage control design for the “Buck power converter/DC motor” system, which allows to perform the sensorless angular velocity trajectory tracking task. The differential flatness property of the DC-motor model is exploited in order to propose a first-stage controller, which is designed to achieve the desired angular velocity trajectory. This controller provides the voltage profiles that must be tracked by the Buck converter. Then, a second-stage controller is meant to assure the aforementioned. This controller is based on flatness property of the Buck power converter model, which provides the input voltage to the DC motor. Due to the fact that the two-stage controller proposed uses the average model of the system, as a practical and effective implementation of this controller, a -modulator is employed. Finally, in order to verify the control performance of this approach, numerical simulations are included.