Abstract-This paper presents a very-high-speed (VHS) slotless permanent-magnet motor design procedure using an analytical model. The model is used to design the optimal prototype (target: 200 kr/min, 2 kW). The multiphysics analytical model allows a quick optimization process. The presented model includes the magnetic fields, the mechanical stresses in the rotor, the electromagnetic power losses, the windage power losses, and the power losses in the bearings. VHS machines need a new torque measurement method. This paper presents the developed method. It also presents a ball bearing friction torque measurement method designed particularly for VHS machines. Remarkably, the method allowed us to design a prototype which operates beyond the target of speed and power. The results given by the model are compared with the measurements of the prototype.

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Magnetic gears, a promising alternative to conventional mechanical gear boxes, have gained growing attention in the last decade. This paper proposes a novel topology of flux focusing magnetic gear which makes use of both axial and transverse magnetic fluxes. Important geometrical parameters are optimized using a sequential parametric sweeping analysis. Performances are validated by a three-dimensional finite element method and compared with existing magnetic gears. The result indicates that by reducing the saturation in soft magnetic materials and the flux leakage, the new topology has a significantly high torque density within a wide length-diameter ratio.