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( )Magnetic FieldMagnetic FieldMagnetic FieldMagnetic FieldAnalysis ofAnalysis ofAnalysis ofAnalysis of a Permanet Magnet Motor with a Skewed Rotor a Permanet Magnet Motor with a Skewed Rotor a Permanet Magnet Motor with a Skewed Rotor a Permanet Magnet Motor with a Skewed RotorUsingUsingUsingUsing thethethethe Finite Element Method andFinite Element Method andFinite Element Method andFinite Element Method and aaaa 3-D Mesh Coupling Method 3-D Mesh Coupling Method 3-D Mesh Coupling Method 3-D Mesh Coupling MethodYasuto Taniguchi, Akihiko Miwa, Hiroshi Hashimoto, Koji TaniandTakashi Yamada (The Japan Research Institute, Ltd.)AbstractThis paper presents a magnetic field analysis of a permanet magnet motor with a skewed rotor using the finite elementmethod(FEM) and a 3-D mesh coupling method. The 3-D mesh coupling method combines the stator mesh and the rotor meshat each angle of the rotor. After mesh coupling, the magnetic field analysis is performed using FEM. To confirm the effectivenessof the skew, the cogging torque, the induced voltage and the running torque are calculated using our method, and the computedresults compared with the results from a 2D ananysis.(Keyword:skew,permanetmagnetmotor,3-Dmeshcouplingmethod,DelaunaysMethod,finiteelementmethod) ( ) MAJ A0 0rot grad rot rot + |.|

\|+ =t(1)0 grad div =)`|.|

\|+ tA(2)A J0M 0 (1) (2)AAB Je A B rot = (3)|.|

\|+ = gradetAJ (4)(1) (2)RIdtdV + =(5)V RI A = dvSnccn A (6)nc Sc n I J0 n J0ISncc= (7) 437.5mm 12U V W100 8VU VVVW 60 120V10 20 3030201/4 40662371284409855808 20U V WSwUSwV SwWVU VV VWU- W+V-U+W-3010 203 DECAlpha Station 500/500 30550001 12600rpm102030 20-0.03-0.02-0.010.000.010.020.030 10 20 30 40 50 60 (deg) (Nm)0deg2D10deg2D20deg2D30deg2D0deg3D10deg3D20deg3D30deg3D600rpm 30V30030 150 (2000) SA-96-26 RM-96-76 (1996)No.480 (1994)A. Kameari, Local Force Calculation in 3D FEM withEdgeElements,Int.J.ofElectromagneticsinMaterials 3, 231-240 (1993)No.486 (1994)