Calculating energy consumption of motor systems with varying load using iso efficiency contours

• Published in: The XIX International Conference on Electrical Machines - ICEM 2010 pp. 1 - 6
• Main Authors: Vanhooydonck, D, Symens, W, Deprez, W, Lemmens, J, Stockman, K, Dereyne, S
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-09-2010
• Subjects: Efficiency; Energy consumption; Energy measurement; Iso Efficiency Contours; Temperature measurement; Torque; Torque measurement; Trajectory; Variable Speed Drives; Varying Load
• ISBN: 9781424441747; 1424441749
• DOI: 10.1109/ICELMACH.2010.5607992

Increasing awareness of ecological problems forces machine manufacturers to design greener machines. This implies amongst other things the selection of the most efficient electric motor system for their specific application. On the other hand, machine building applications evolve more and more from constant speed and load characteristics to varying speed and load applications. Therefore, the motor system that is used evolves more and more from direct online (DOL) to motors fed by a variable speed drive (VSD). However, current efficiency standardization focuses on DOL applications, and can by consequence not offer assistance to the machine builder to select the most efficient motor-VSD combination for his particular varying load application. The goal of this paper is to present a methodology that allows to predict the energy consumption for a specific motor-VSD combination and a specific varying speed-load application, using the fairly new concept of iso efficiency contours. By comparing the predicted energy consumption for a number of selected combinations, the most efficient one is revealed.