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The paper presents an analytical model for predicting the open-circuit magnet eddy-current loss due to slotting in surface-mounted permanent-magnet machines based on the exact subdomain field model. The spatial and temporal characteristics of field harmonics due to slotting and corresponding eddy-current harmonics in the magnet are analyzed in both stator and rotor reference frames. The contribution...
The split ratio between the rotor and stator outer diameters is an important design parameter. Considerable research has been carried out for the analytical determination of the optimal split ratio in both internal rotor and tubular permanent magnet brushless machines over last decade. In this paper, the optimal split ratio for both non-overlapping and overlapping winding external rotor permanent...
The paper compares five analytical models for predicting the cogging torque in surface-mounted permanent magnet machines, viz. lateral force (LF), complex permeance (CP), and combined CP models, together with subdomain (SD) models based on single slot/pole and exact SD model. The models are evaluated for the cogging torque waveforms and the prediction of optimal pole-arc to pole-pitch and slot-opening...
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