Design, Commissioning and Testing of an Electrodynamometer Based on PM Synchronous Machines

 

J.J. Rodríguez-Rivas*¹ and E. Peralta-Sánchez²

 

¹ Departamento de Ingeniería Eléctrica. SEPI. ESIME ZACATENCO, Instituto Politécnico Nacional México, D. F., México. *jjrodriguezr@ipn.mx

² Departamento de Ingenierías, Universidad Popular Autónoma del Estado de Puebla Puebla, Pue., México.

 

ABSTRACT

This paper addresses the design, simulation, commissioning and testing of an electrodynamometer (ED) to assess the dynamic performance of Electric Vehicles (EV). The EV-ED system is comprised of two electric machines coupled mechanically. The traction machine is a 7.75 kW Permanent Magnet Synchronous Motor which is controlled by means of a vector control and it is coupled mechanically to a similar machine which is used as a mechanical load. The load machine was fed by two DC/AC converters connected by the DC bus allowing bidirectional power flow. The electrodynamometer was controlled by means of a National Instruments electronic board and Labview software. Several load profiles and inertias were programmed to emulate an Electric Vehicle (EV). The traction machine drive was implemented with a PP75T120 Powerex Inverter. PWM generation and control strategy were implemented on a MC56F8357 Freescale Digital Signal Controller (DSC). The speed control of the traction machine was validated for different driving cycles. Matlab/Simulink simulations of the machine control and electrodynamometer along with experimental results illustrating the response of the machine control under the characteristic load profile of an EV are presented and analyzed. Traction and regenerative breaking stages are analyzed and discussed broadly.

Keywords: Electrodynamometer, electric vehicle, permanent magnet synchronous machine.

 

RESUMEN

Este artículo aborda el diseño, simulación, implementación y comprobación experimental de un electrodinamómetro (ED) con el objetivo fundamental de evaluar el desempeño dinámico de un vehículo eléctrico (EV). El sistema ED-EV está compuesto de dos máquinas eléctricas acopladas mecánicamente. La máquina de tracción es una máquina síncrona de imanes permanentes (PMSM) de 7.75 kW y su sistema de control es de tipo vectorial. La máquina esta acoplada mecánicamente con otra similar la cual es utilizada como máquina de carga. El electrodinamómetro fue implementado con dos convertidores CD/CA conectados entre sí por el bus de CD permitiendo un flujo de potencia bidireccional. El electrodinamómetro es controlado por medio de una tarjeta electrónica de National Instruments y Labview instalado en una computadora. Para emular el EV se programaron diferentes perfiles de carga e inercias. El accionamiento de la máquina de tracción fue implementado con un inversor Powerex del tipo PP75T120. La generación de las señales PWM y la estrategia de control fueron implementadas en un controlador digital de señales (DSC) de Freescale del tipo MC56F8357. El control de velocidad de la máquina de carga fue validado usando diferentes ciclos de manejo. Se presentan y analizan simulaciones en Matlab/Simulink del control de la máquina y del electrodinamómetro, así como resultados experimentales que ilustran la respuesta del control de la máquina de tracción con una carga que corresponde a un EV. Las etapas de tracción y frenado regenerativo son analizadas y discutidas ampliamente.

 

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Acknowledgment

This work was supported by the Institute of Science and Technology for Federal District (ICyTDF), México, under the project grant PICS08-50.

 

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