Title :
Influence of Slot Opening on Optimal Stator and Rotor Pole Combination and Electromagnetic Performance of Switched-Flux PM Brushless AC Machines
Author :
Chen, J.T. ; Zhu, Z.Q. ; Iwasaki, S. ; Deodhar, Rajesh P.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK
Abstract :
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.
Keywords :
AC machines; brushless machines; magnetic flux; permanent magnet machines; rotors; stators; torque; cogging torque; electromagnetic performance; magnet thickness; optimal stator-rotor pole combination; slot opening; switched flux permanent magnet brushless AC machines; torque ripple; Magnetic analysis; Magnetic flux; Rotors; Saturation magnetization; Stator windings; Torque; Brushless; combination of slot and pole numbers; low cost; permanent magnet; switched flux;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2011.2155011
