Unlike conventional electric rotary machines, the rotor poles of claw-pole type generators are made by mold and their shape is not symmetrical along rotor axis. This structure results in the 3D-dimensional (3D) flux distribution in the machines and requires 3D magnetic field analysis. Therefore, 3D finite element analysis (FEA) can be directly applied to the magnetic field analysis. However, 3D FEA requires huge computation time and memory. Therefore, it is not practical to apply 3D FEA in the initial design stage of claw-pole type machine.
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