Cogging torque reduction of Bldc motor using level set based topology optimization incorporating with triangular finite element

Issue title: Selected Papers from the 14th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2009), Part II

Article type: Research Article

Authors: Meng, Xiangjun^a | Wang, Shuhong^{a; *} | Qiu, Jie^a | Zhu, Jian Guo^b | Guo, Youguang^b

Affiliations: [a] State Key Laboratory of Electrical Insulation and Power Equipment, Faculty of Electrical Engineering, Xi'an Jiaotong Univerisity, Xi'an 710049, China | [b] School of Electrical, Mechanical and Mechatronic Systems, University of Technology, Sydney, NSW 2007, Australia

Correspondence: [*] Corresponding author. Tel.: +86 29 82668630 213; E-mail: shwang@mail.xjtu.edu.cn

Abstract: Cogging torque in permanent-magnet brushless DC (BLDC) motor causes torque and speed ripples, as well as acoustic noise and vibration, especially in low speed and direct drive applications. In this paper, the stator core shape is optimized by using a level set based topology optimization to reduce cogging torque. The level set method can represent the precise boundary shape of structure and also deal with complex topology changes during the optimization process. Different from the conventional rectangular meshes, the level set technique based triangular finite element meshes are presented in this paper to deal with irregular domains. The comparison of cogging torque calculated before and after topology optimization verifies the advantages of the level set topology optimization based on triangular meshes.

Keywords: Topology optimization, level set, adjoint variable, cogging torque

DOI: 10.3233/JAE-2010-1222

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 3-4, pp. 1069-1076, 2010