Influence of Slot Opening on Optimal Stator and Rotor Pole Combination and Electromagnetic Performance of Switched-Flux PM Brushless AC Machines

The significant influence of slot opening on the optimal stator and rotor pole combination and on the electromagnetic performance of the switched-flux permanent magnet (SFPM) machine is observed and investigated in this paper. A new SFPM brushless machine with remarkable slot opening relative to the...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2011-07, Vol.47 (4), p.1681-1691
Main Authors: Chen, J. T., Zhu, Z. Q., Iwasaki, S., Deodhar, R. P.
Format: Article
Language:English
Subjects:
Brushless
combination of slot and pole numbers
EMF
low cost
Magnetic analysis
Magnetic flux
Optimization
permanent magnet
Permanent magnets
Poles
Ripples
Rotors
Saturation magnetization
Stator windings
Stators
switched flux
Torque
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Summary:The significant influence of slot opening on the optimal stator and rotor pole combination and on the electromagnetic performance of the switched-flux permanent magnet (SFPM) machine is observed and investigated in this paper. A new SFPM brushless machine with remarkable slot opening relative to the magnet thickness is developed to reduce the magnet usage and to increase the slot area. Its stator slot opening is almost several times of that in the conventional SFPM machine, but its magnet usage is only half. However, the new machine exhibits ~ 40% larger back EMF and electromagnetic torque than those of the conventional machine, while its cogging torque and torque ripple are significantly lower.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2011.2155011