Search
Home > Issues > SearchMagnetic Field Analysis of Notched SPMSM Using Conformal Mapping
Journal of Magnetics, Volume 24, Number 1, 31 Mar 2019, Pages 168-173
Young-Yoon Ko (Sungkyunkwan University), Jun-Young Song (Sungkyunkwan University), Myung-Ki Seo (Sungkyunkwan University), Yong-jae Kim (Chosun University), Sang-Yong Jung * 
(Sungkyunkwan University)
(Sungkyunkwan University)
Abstract
We present an analytical method for applying conformal mapping to the notched geometry of a surface permanent magnet synchronous motor to calculate the cogging torque. First, the complex relative air-gap permeance
(CRAP) of the notched air-gap is calculated by multiplying the CRAP of a slotted air-gap with the notch sensitivity coefficient, which is defined by the relation of slot and notch shapes. Secondly, the no-load air-gap flux
density (AFD) is derived from the CRAPs of the notched and slotted air-gaps. Finally, the cogging torque of the notched motor is calculated by the no-load AFD and is verified using the 2D finite element analysis (FEA)
result. A 4-pole and 12-slot surface permanent magnet synchronous motor with the notch is used herein.
(CRAP) of the notched air-gap is calculated by multiplying the CRAP of a slotted air-gap with the notch sensitivity coefficient, which is defined by the relation of slot and notch shapes. Secondly, the no-load air-gap flux
density (AFD) is derived from the CRAPs of the notched and slotted air-gaps. Finally, the cogging torque of the notched motor is calculated by the no-load AFD and is verified using the 2D finite element analysis (FEA)
result. A 4-pole and 12-slot surface permanent magnet synchronous motor with the notch is used herein.
Keywords: analytical method; air-gap permeance; conformal mapping; notched motor
DOI: https://doi.org/10.4283/JMAG.2019.24.1.168
Full Text : PDF
