Magnetic Equivalent Circuit Model Considering the Overhang Structure of an Interior Permanent-Magnet Machine

Overhang is a useful structure for increasing the torque and power densities of permanent-magnet (PM) machines without expansion of the machine space. A 3-D finite-element method (FEM) is needed to evaluate the performances of PM machines with an overhang structure because the overhang structure results in non-uniform magnetic flux distributions in the axial direction. However, it is computationally expensive, especially in the early design stage. In this paper, we propose a magnetic equivalent circuit (MEC) model considering the overhang effects of interior PM (IPM) machines. With the proposed MEC, the performances of IPM machines with an overhang structure were precisely calculated and the computational time was significantly reduced. The proposed MEC was verified by the 3-D FEM.

[1]  Shinji Wakao,et al.  Overhang effect analysis of brushless DC motor by 3-D equivalent magnetic circuit network method , 2003 .

[2]  T. Lipo,et al.  Analytical calculation of magnetic field distribution in the slotted air gap of a surface permanent-magnet motor using complex relative air-gap permeance , 2006, IEEE Transactions on Magnetics.

[3]  S. Z. Jiang,et al.  Analytical Modeling of Open-Circuit Air-Gap Field Distributions in Multisegment and Multilayer Interior Permanent-Magnet Machines , 2009, IEEE Transactions on Magnetics.

[4]  In-Soung Jung,et al.  Analysis of Overhang Effect for a Surface-Mounted Permanent Magnet Machine Using a Lumped Magnetic Circuit Model , 2014, IEEE Transactions on Magnetics.

[5]  Hyun-Kyo Jung,et al.  Analysis and Design of a Multi-Layered and Multi-Segmented Interior Permanent Magnet Motor by Using an Analytic Method , 2014, IEEE Transactions on Magnetics.

[6]  Dong-Kyun Woo,et al.  Magnetic Equivalent Circuit Model Considering Overhang Structure of a Surface-Mounted Permanent-Magnet Motor , 2015, IEEE Transactions on Magnetics.

[7]  Sang-Yong Jung,et al.  Electromagnetic and Thermal Analysis of a Surface-Mounted Permanent-Magnet Motor with Overhang Structure , 2017, IEEE Transactions on Magnetics.

[8]  Dheeraj Bobba,et al.  Analysis of Overhang Effects Using Conductor Separation Method in Coreless-Type PM Linear Machines , 2018, IEEE Transactions on Magnetics.

[9]  Z. Zhu,et al.  A Hybrid Field Model for Open-Circuit Field Prediction in Surface-Mounted PM Machines Considering Saturation , 2018, IEEE Transactions on Magnetics.

[10]  Mojtaba Mirsalim,et al.  A Transverse Flux Generator With a Single Row of Permanent Magnets: Analytical Design and Performance Evaluation , 2019, IEEE Transactions on Industrial Electronics.