Analytical prediction of cogging torque for interior permanent magnet synchronous motors

Article type: Research Article

Authors: Lim, Dong-Kuk^a | Jung, Sang-Yong^{b; *} | Jung, Hyun-Kyo^c | Ro, Jong-Suk^{d; *}

Affiliations: [a] School of Electrical Engineering, University of Ulsan, Ulsan 44610, Korea | [b] School of Electronic and Electrical Engineering, SungKyunKwan University, Suwon 16419, Korea | [c] Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea | [d] School of Electrical and Electronics Engineering, ChungAng University, Seoul 06974, Korea

Correspondence: [*] Corresponding authors: Sang-Yong Jung, School of Electronic and Electrical Engineering, SungKyunKwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Korea. Tel.: +82 31 299 4952; Fax: +82 31 299 4918; E-mail: syjung@skku.eduandJong-SukRo,SchoolofElectricalandElectronicsEngineering,ChungAngUniversity,Seoul,06974,Korea.Tel.:+8228205557;Fax:+8228205557;E-mail:jongsukro@naver.com.

Abstract: The cogging torque calculation of interior permanent magnet synchronous motors (IPMSMs) has only been conducted by the finite element method (FEM) due to their complexities. However, FEM analysis requires considerable computational time during the design process. To deal with this problem, a new analytical method is proposed to calculate the cogging torque in IPMSMs. The radial and circumferential air-gap flux density for calculating the cogging torque utilizes the magnetic equivalent circuit model, conformal mapping method, and approximate equations of the magnet end. The validity of the proposed method was confirmed by comparing the results of the proposed method with those of FEM.

Keywords: Analytic method, conformal mapping, interior permanent magnet synchronous motor, magnetic equivalent circuit

DOI: 10.3233/JAE-9170094

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 55, no. 4, pp. 625-635, 2017