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.
WooD.K.LimD.K. and JungH.K., Rotor design strategy of interior permanent magnet synchronous motor for fuel cell electric vehicle, IJAEM40(1) (2012), 51–66.
2.
SeoU.J.ChunY.D.ChoiJ.H.HanP.W. and KooD.H., Design of rotor shape for reducing torque ripple in interior permanent magnet motors, IJAEM39(1) (2012), 881–887.
3.
KimI.W.WooD.K.LimD.K.JungS.Y.LeeC.G.RoJ.S. and JungH.K., Minimization of a cogging torque for an interior permanent magnet synchronous machine using a novel hybrid optimization algorithm, J Elect Eng Technol9(3) (May 2014), 859–865.
4.
LimD.K.WooD.K.KimI.W.RoJ.S. and JungH.K., Cogging torque minimization of a dual-type axial-flux permanent magnet motor using a novel optimization algorithm, IEEE Trans Magn49(9) (Sep. 2013), 5106–5111.
5.
JollyL.JabbarM.A. and QinghuaL., Design optimization of permanent magnet motors using response surface methodology and genetic algorithms, IEEE trans Magn41(10) (Oct. 2005), 3928–3930.
6.
WooD.K.LimD.K.AliM. and JungH.K., Optimal rotor structure design of interior permanent magnet synchronous machine based on accelerating evolution algorithm using the Kriging metamodel, IJAEM36(4) (2011), 317–325.
7.
ZhuL.JiangS.Z.ZhuZ.Q. and ChanC.C., Analytical modeling of open-circuit air-gap field distributions in multisegment and multilayer interior permanent-magnet machines, IEEE Trans Magn45(8) (Aug. 2009), 3121–3130.
8.
LimD.K.YiK.P.WooD.K.YeoH.K.RoJ.S.LeeC.G. and JungH.K., Analysis and design of a multi-layered and multi-segmented interior permanent magnet motor by using an analytic method, IEEE Trans Magn50(6) (Jun. 2014), 8201308.
9.
ZarkoD.BanD. and LipoT.A., Analytical solution for cogging torque in surface permanent-magnet motors using conformal mapping, IEEE Trans Magn44(1) (Jan. 2008), 52–65.
10.
ZarkoD.BanD. and LipoT.A., Analytical calculation of magnetic field distribution in the slotted air gap of a surface permanent-magnet motor using complex relative air-gap permeance, IEEE Trans Magn42(7) (Jul. 2006), 1828–1837.
