This paper presents a design methodology for high-speed slotless permanent-magnet motors using soft magnetic composite material (SMC) in the stator and surface-mounted magnets on the rotor. An analytical design model is derived from the two-dimensional magnetic field distribution produced by the rotor magnets and the stator windings currents. It takes into account the eddy currents induced in the conductive stator core and the time and space harmonics of the magnetic field sources. It has been cross-validated by 2D Finite Element (FE) analysis in terms of magnetic field distribution and eddy currents losses. The design model is associated to an optimization procedure and an iterative correction mechanism performed by 3D FE analysis to take into account the influence of the end effects on the stator eddy currents losses. The design methodology is illustrated by the comparative analysis of two PM motors with 2 and 4 poles and a rated power of 500W at 20000rpm.
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