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Comparison of PM brushless motors, having either all teeth or alternate teeth wound

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3 Author(s)
Ishak, D. ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK ; Zhu, Z.Q. ; Howe, D.

The electromagnetic performance of three-phase permanent magnet brushless motors in which the slot and pole numbers are similar and either all the teeth or only alternate teeth carry a concentrated coil is compared. Analytical and finite element techniques are employed to predict the air-gap flux density distribution, the cogging torque, electromotive force (EMF) and static torque waveforms, and the winding inductances, predicted results being validated by measurements. It is shown that there is a significant difference in both the phase and line EMF waveforms, the static torque-rotor position waveforms, and the self and mutual inductances.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:21 ,  Issue: 1 )