J. Rodríguez-Reséndiz*¹, J. M. Gutiérrez-Villalobos¹, D. Duarte-Correa¹, J. D. Mendiola-Santibañez¹, I. M. Santillán-Méndez¹

¹Universidad Autónoma de Querétaro, División de Estudios de Posgrado, Facultad de Ingeniería, Cerro de las Campanas s/n, 76010 Querétaro, México. *juvenal@ieee.org.

Abstract

In this article a hardware topology meant to compare the velocity performance of both an induction motor and a permanent magnet (PM) AC three-phase motor is presented. A variable reference is tracked by the sensorless vector-controlled adjustable speed drive (ASD) that permits, by means of the same type of control, performing the speed control loop of the two motors. The algorithms are programmed on a digital signal processor (DSP) in order to ensure efficient use of energy in the transistor bridge and proper tracking of the reference at low and high speeds. Regarding the torque performance, a laboratory test bed based on a torquemeter and two motors is constructed. The hardware implementation includes the power and the digital stages. A serial communication between the PC and the ASD is accomplished to put into operation in the user front-end because a high speed sample frequency is required for the analysis software that runs in the PC. This interface is used not only as comparing the speed response of the motors signals but also as looking the power quality analysis of each motor measurements based on software. Results are presented to demonstrate the effectiveness of the sensorless scheme.

Keywords: Signal processing, vector control, AC motors, sensorless control, torque measurement.

Resumen

En este artículo se presenta una topología de hardware para comparar el rendimiento de velocidad de un motor de inducción y otro de imanes permanentes (PM) de AC. A una referencia variable le sigue un variador de velocidad ajustable (ASD) con base en control vectorial sin sensores. Los algoritmos se programan en un procesador digital de señales (DSP) para asegurar el uso eficiente de energía en el puente de transistores y el seguimiento de la referencia en velocidades bajas y altas. En lo que se refiere al rendimiento de torque, se construye una mesa de pruebas de laboratorio con base en torquímetro y dos motores. La implementación incluye la etapa de hardware y software. Se lleva a cabo una comunicación serial entre la computadora y el ASD para poner en operación una interfaz debido a la alta velocidad de muestreo que requiere por el análisis en software montado en una PC. Esta interfaz se utiliza no solo para la comparación de la respuesta de ambos motores sino también para observar el comportamiento de la propuesta del controlador en este trabajo. Se presentan resultados para demostrar la efectividad del esquema sin sensores.

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