An Integrated Electromechanical Actuator05607844

An Integrated Electromechanical Actuator05607844 - XIX...

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Φ Abstract – This paper presents the design concepts and the test results of an electro-mechanical actuator for high- performance pump application. The rotating permanent magnet synchronous motor is integrated with the mechanical component in a rotating-screw architecture in order to minimize the total inertia. The motion trajectory fits the classical profile with high-torque at low-speed and low-torque at high speed, which involves flux-weakening operation and optimization of the torque-to-speed characteristics both at base and maximum speed. A prototype has been manufactured using the design data of the optimization procedure. Test results confirm the performance of the system. Index Terms – Electromechanical actuators, permanent- magnet motors, finite element analysis, adjustable speed drive, pump applications. I. INTRODUCTION ecent trends in system automation include the development of custom electrical actuators, whose different mechanical, electrical, and sometimes electronic components are designed by an integrated approach strictly related to the requirements of the specific application [1], [2]. Often, the electrical actuator is developed to replace a full-mechanical actuator inside a pre- existing machine: in these cases the main design enforces are directed to satisfy both the performance and the encumbrance limits [3], [4]. Surface Mounted (SM) permanent magnet synchronous motors (PMSM) represent the preferred solution for integrated actuators, due to their high power-to-size, torque to current, and torque-to-inertia ratios, and the excellent controllability given the linear relationship between torque and current with field-oriented control [5]. Nevertheless, PM motors must be carefully designed in order to match the application requirements, especially when the motion trajectory fits the classical high-torque at low-speed and low- torque at high speed profile. In fact, a “two-points- objectives” design must be satisfied, whose goal is to maximize the torque-to-speed characteristic for a given motor size. This paper deals with the development of an integrated electro-mechanical actuator for high-performance pump application using a SM-PMSM. The mechanical components are designed following the rotating screw-architecture, in single body with the motor axis. A three-phase synchronous motor with surface permanent magnets is designed in order to match the low rotating inertia and the strict torque-to- speed requirements. Based on the operating cycles of the Enzo Chiricozzi, Marco Tursini and Marco Villani are with the Department of Electrical and Information Engineering, University of L’Aquila, I-67100, L’Aquila, Italy (e-mail: enzo.chiricozzi@univaq.it, marco.tursini@univaq.it, marco.villani@univaq.it,). Luca Castellini is with Umbragroup, I-06034 Foligno (PG), Italy,
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This note was uploaded on 05/08/2011 for the course MECHANICAL 203 taught by Professor Krishna during the Spring '11 term at Akademia Ekonomiczna w Poznaniu.

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An Integrated Electromechanical Actuator05607844 - XIX...

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