DocumentCode :
2179436
Title :
Analytical optimization and comparison of torque densities between permanent magnet and electrically excited machines
Author :
Chu, W.Q. ; Zhu, Z.Q. ; Chen, J.T.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK
fYear :
2012
fDate :
2-5 Sept. 2012
Firstpage :
1192
Lastpage :
1198
Abstract :
This paper compares the torque densities, i.e. torque per volume (T/V) and torque per weight (T/G), between permanent magnet (PM) and electrically excited (EE) machines for low speed applications when they have the same overall size and copper loss. The machines are optimized individually and analytically. The optimal split ratio and flux density ratio are derived. The influence of pole number and machine size is investigated as well. The analytical models are verified by finite element (FE) analyses. It shows that PM machines exhibit more than √2 times torque densities of EE machines. For EE machines, there is an optimal pole number to maximize torque densities and they prefer large volume applications. The comparison also shows that the T/G designs have significantly higher split ratio than the T/V designs to balance torque and weight.
Keywords :
finite element analysis; optimisation; permanent magnet machines; torque; EE machines; FE analysis; PM machines; analytical optimization; copper loss; electrically-excited machines; finite element analysis; flux density ratio; low-speed applications; machine size; optimal pole number; optimal split ratio; permanent magnet machines; torque densities; torque per volume; torque per weight; Copper; Optimization; Rotors; Stator windings; Torque; Windings; Analytical; comparison; electrically excited machines; optimization; permanent magnet machines; split ratio; torque density ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Machines (ICEM), 2012 XXth International Conference on
Conference_Location :
Marseille
Print_ISBN :
978-1-4673-0143-5
Electronic_ISBN :
978-1-4673-0141-1
Type :
conf
DOI :
10.1109/ICElMach.2012.6350027
Filename :
6350027
Link To Document :
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