%0 Journal Article
%T Optimal Electromagnetic-Thermal Design of a Seven-phase Induction Motor for High-Power Variable-Speed Applications
%J Scientia Iranica
%I Sharif University of Technology
%Z 1026-3098
%A Heidari, Zargham
%A Gorginpour, Hamed
%A Shahparasti, Mahdi
%D 2021
%\ 01/04/2021
%V
%N
%P -
%! Optimal Electromagnetic-Thermal Design of a Seven-phase Induction Motor for High-Power Variable-Speed Applications
%K 7-phase induction motor
%K optimization
%K coupled-circuit model
%K lumped parameter thermal model
%K Finite-element method
%K winding function
%R 10.24200/sci.2021.54766.4028
%X Induction motors have been traditionally used in industrial applications ranging from a fraction of horse-power up to several Megawatts due to their substantial benefits. Induction drives with more than three-phases are superior to the 3-phase induction drives in terms of overall-volume, torque fluctuations, current passing each stator-winding, ohmic-loss, efficiency and reliability in the case of stator-windings open-circuit fault. These benefits are especially more attractive in variable speed drivers due to the reduced capacity of power-electronics switches. This paper aims to develop an optimal electromagnetic-thermal design procedure of a high-power seven-phase induction motor suitable for variable-speed applications. In this multi-objective design approach, the objective function is defined aiming to increase the efficiency, power-factor, power-to-weight ratio, starting-torque as well as decrease the starting-current. Furthermore, the electrical, mechanical, dimensional, magnetic and thermal limitations are included in this optimization study in order to ensure practical realization of the designed machine. The coupled-circuit method is employed for nonlinear electromagnetic modeling while the current displacement phenomenon is considered in rotor parameters calculations. A lumped-parameter-thermal model is established for calculating heat rises of different parts in each iteration of optimization study. Finally, the performance characteristics of the optimally designed 1-MW 4-pole motor are verified using 2D-FE analyses.
%U http://scientiairanica.sharif.edu/article_22123_6b24999fb1cc4b056fd513c51a284b37.pdf