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A Novel Air-Gap Profile of Single-Phase Permanent-Magnet Brushless DC Motor for Starting Torque Improvement and Cogging Torque Reduction

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2 Author(s)
Fazil, M. ; Dept. of Electr. Eng., Indian Inst. of Technol. Delhi, New Delhi, India ; Rajagopal, K.R.

We propose a new air-gap profile for single-phase permanent-magnet brushless dc (SP PM BLDC) motor to improve starting torque and to reduce cogging torque. We calculate starting torque and cogging torque using finite-element (FE) analysis. We perform a parametric analysis to study the effect of variation of proposed profile dimensions on cogging torque and starting torque. More than 70% improvement in starting torque and considerable reduction in magnitude of cogging torque is achieved compared to existing tapered air-gap profiles.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 11 )