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Han-Kyeol Yeo,Dong-Kuk Lim,Dong-Kyun Woo,Jong-Suk Ro,Hyun-Kyo Jung IEEE 2015 IEEE transactions on magnetics Vol.51 No.3
<P>An overhang structure is used to enhance the air-gap flux density and increase the torque density of a motor. In the preliminary design stage, consideration of the overhang effect is important for a precise prediction of the performance of a motor with overhang and for the selection of the proper overhang length. The 3-D finite-element method (FEM) is essential when analyzing a motor with an overhang structure due to the asymmetry in the axial direction caused by overhang. However, it is computationally expensive and time-consuming, especially during the initial design stage. In this paper, we propose a magnetic equivalent circuit model, which considers the overhang structure of a surface-mounted permanent-magnet motor. With the proposed analytical method, the computational time is significantly reduced in the preliminary design stage. The proposed analytical model is verified with a 3-D FEM analysis.</P>
Yeo, Han-Kyeol,Park, Hyeon-Jeong,Seo, Jung-Moo,Jung, Sang-Yong,Ro, Jong-Suk,Jung, Hyun-Kyo IEEE 2017 IEEE transactions on magnetics Vol.53 No.6
<P>Recently, overhang structures are increasingly used for various applications requiring high torque and power densities in a limited space such as traction motors of electric vehicles and servo motors of robot arms. In the design stage, overhang effects should be taken into account to predict the performances and the temperature rise of a motor with overhang. However, little research has been conducted on the thermal characteristics and analysis methods for a surface-mounted permanent-magnet (SPM) motor with overhang. To address this problem, the electromagnetic and thermal characteristics of the SPM motors with and without overhang are invested in this paper. Specifically, 3-D finite-element method is used in electromagnetic analysis to accurately calculate electromagnetic losses which are heat sources in thermal analysis. Moreover, the lumped-parameter thermal network (LPTN) which can consider overhang effects rapidly and precisely is proposed as an analytical method. Through the proposed LPTN, the computation time for thermal analysis is reduced considerably in comparison with a computational fluid dynamics method, and the temperature rise of the motors are precisely predicted. The results calculated in electromagnetic and thermal analysis are verified experimentally with 0.3 Nm, 20-pole/24-slot SPM motors adopting natural cooling.</P>
Han-Kyeol Yeo,Dong-Kyun Woo,Dong-Kuk Lim,Jong-Suk Ro,Hyun-Kyo Jung 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
The rotor overhang is used to enhance the air-gap flux and improve the power density. Due to the asymmetry in the axial direction caused by the overhang, a time consuming 3D analysis is necessary when designing a motor with overhang. To solve this problem, this paper proposes an equivalent magnetic circuit model (EMCM) which takes account overhang effects without a 3D analysis by using effective air-gap length. The analysis time can be reduced significantly via the proposed EMCM. A reduction in the analysis time is essential for a preliminary design of a motor. In order to verify the proposed model, a 3-D finite-element method (FEM) analysis is adopted. 3-D FEM results confirm the validity of the proposed EMCM.
Yeo, Han-Kyeol,Woo, Dong-Kyun,Lim, Dong-Kuk,Ro, Jong-Suk,Jung, Hyun-Kyo The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
The rotor overhang is used to enhance the air-gap flux and improve the power density. Due to the asymmetry in the axial direction caused by the overhang, a time consuming 3D analysis is necessary when designing a motor with overhang. To solve this problem, this paper proposes an equivalent magnetic circuit model (EMCM) which takes account overhang effects without a 3D analysis by using effective air-gap length. The analysis time can be reduced significantly via the proposed EMCM. A reduction in the analysis time is essential for a preliminary design of a motor. In order to verify the proposed model, a 3-D finite-element method (FEM) analysis is adopted. 3-D FEM results confirm the validity of the proposed EMCM.
Yeo, Han-Kyeol,Woo, Dong-Kyun,Lim, Dong-Kuk,Ro, Jong-Suk,Jung, Hyun-Kyo Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.4
The rotor overhang is used to enhance air-gap flux and improve power density. Due to asymmetry in the axial direction caused by the overhang, the time consuming 3D analysis is necessary to design the motor with overhang. To solve this problem, this paper proposes the equivalent magnetic circuit model (EMCM) that can consider overhang effects without the 3D analysis by using effective air-gap length. The analysis time can be reduced significantly via the proposed EMCM. The reduction of the analysis time is essential for the preliminary design of the motor. In order to verify the proposed model, the 3-D finite-element method (FEM) analysis is adopted. 3-D FEM results confirm the validity of the proposed EMCM.
Winding Factor of Vernier Permanent Magnet Motor
Kwon Hyuk-Sung,Yeo Han-Kyeol,Seo Jangho 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
Several studies have been reported on vernier permanent magnet synchronous motors (VPMSMs) using spatial harmonics in air-gap fl ux density owing to their low-speed high-torque characteristics. However, coeffi cients that can predict the performance of VPMSMs in motor design processes have not been extensively researched. The gear ratio indicates the degree of amplifi cation of the spatial harmonics, but there is a big diff erence between the performances predicted using the gear ratio and the actual performance of VPMSMs. The winding factor can estimate the magnitude of the electromotive force (EMF) of the motor. Although the winding factor is suitable for conventional motors, it cannot be applied to VPMSM, which amplifi es EMF through spatial harmonics. In this study, we investigated the winding factor of VPMSMs and proposed a winding factor calculation method suitable for VPMSMs. Based on the analytical method, the proposed calculation method could instantly and accurately estimate the winding factor of VPMSMs. With this method, the EMF performance of VPMSMs can be predicted according to the pole–slot combination. To verify the validity of the proposed method, we compared the gear ratio, the proposed winding factor, and the magnitude of the EMF obtained by the fi nite element method.