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This paper presents an analytical model for predicting the open-circuit, armature reaction, and load eddy current loss in the conductive retaining sleeve of surface-mounted permanent magnet machines accounting for slot opening and tooth-tips. The finite element results confirm the high accuracy of the developed model and the necessity of accounting for the slot opening. The load sleeve loss is equal...
Based on the subdomain field model accounting for tooth-tips, the eddy current losses in magnets are calculated for surface-mounted permanent magnet machines. The contributions of both self action of each harmonic and mutual interaction between field harmonics of different orders to magnet loss are accounted for in the developed model. It allows for predicting magnet losses due to the open-circuit,...
This paper presents a general method for predicting the cogging torque in surface-mounted permanent magnet machines having different slot sizes and uneven positions by synthesizing the cogging torque associated with each slot, which is obtained by the subdomain model. The developed model is applied to analyse the influence of imperfect slot openings on the cogging torque. It shows that machines having...
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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