In this paper, comparisons of the interior permanent magnet (IPM) BLDC motor characteristics considering the slot-pole combination and the magnetization direction simultaneously were done. The three directions of magnetization, radial, parallel and concentration were selected and analyzed for the same permanent magnet shape. No-load and load characteristics were compared. As a result, the motor efficiency of the combination of 6-slot and concentration directions was the best. Through analysis and comparisons, it was confirmed that the magnetization direction should also be considered as an important variable in initial design of the motor.
HanS.-H.JahnsT.M.SoongW.L.GuvenM.K. and IllindalaM.S., Torque ripple reduction in interior permanent magnet synchronous machines using stator with odd number of slots per pole pair, IEEE Transactions on Energy Conversion25(1) (2010), 118–127.
2.
KoH.-S. and KimK.-J., Characterization of noise and vibration sources in interior permanent-magnet brushless DC motors, IEEE Transactions on Magnetics40(6) (2004), 3482–3489.
3.
HurJ.ReuJ.-W.KimB.-W. and KangG.-H., Vibration reduction of IPM-type BLDC motor using negative third harmonic elimination method of air-gap flux density, IEEE Trans. Industrial Application47(3) (2011), 1300–1309.
4.
ChoiJ.-Y.ParkY.-S. and JangS.-M., Experimental verification and electromagnetic analysis for performance of interior PM motor according to slot/pole number combination, IEEE Transactions on Magnetics48(2) (2012), 987–990.
5.
ParsaL. and HaoL., Interior permanent magnet motors with reduced torque pulsation, IEEE Trans. Industrial Electronics55(2) (2008), 602–609.
6.
HongS.-P.ChoH.-S.LeeH.-S.ChoH.-R. and LeeH.-Y., Effect of the magnetization direction in permanent magnet on motor characteristics, IEEE Transactions on Magnetics35(3) (1999), 1231–1234.
7.
BoughraraK.ChikoucheB.L.IbtiouenR.ZarkoD. and TouhamiO., Analytical model of slotted air-gap surface mounted permanent-magnet synchronous motor with magnet bars magnetized in the shifting direction, IEEE Transactions on Magnetics45(2) (2009), 747–758.
8.
WuL. and ZhuZ.Q., Analytical modelling of surface-mounted PM machines accounting for magnet shaping and varied magnet property distribution, IEEE Transactions on Magnetics50(7) (2009), 747–758.
9.
KimH.-s.YouY.-m. and KwonB.-i., Rotor shape optimization of interior permanent magnet BLDC motor according to magnetization direction, IEEE Transactions on Magnetics49(5) (2013), 2193–2196.
10.
KimH.-s. and KwonB.-i., Optimal design of motor shape and magnetization direction to obtain vibration reduction and average torque improvement in IPM BLDC motor, IET Electric Power Application11(3) (2017), 378–385.
11.
JungJ.-W.KimD.-J.HongJ.-P.LeeG.-H. and JeonS.-M., Experimental verification and effects of step skewed rotor type IPMSM on vibration and noise, IEEE Transactions on Magnetics47(10) (2011), 3661–3664.
