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| Magnetomotive Force in Permanent Magnet Synchronous Machine With Concentrated Fractional-Slot Winding |
| Chen Yiguang, Pan Yuling, He Xin |
| Tianjin University Tianjin 300072 China |
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Abstract An analysis is carried out on magnetomotive force (MMF) of the single coil, coil group, phase winding and the three-phase winding of cell permanent magnet synchronous machine with fractional-slot concentrated winding. When the stator slot number is odd, all the MMF exist besides the pole-pairs number is 3 multiple, which have the same fundamental wave winding coefficient, reverse rotatining, and the pole-pairs number corresponding to the harmonic with the largest amplitude misses only one with that of the fundamental wave. And when the stator slot number is even, all the MMF exist besides the pole-pairs number is even or 3 multiple, which have the same fundamental wave winding coefficient, reverse rotatining, and the pole-pairs number corresponding to the harmonic with the largest amplitude misses only 2 or 4 with that of the fundamental wave. Both the subharmonics with big amplitude and the high-order harmonics with the same winding coefficient as the fundamental waves exist in the motor. When the machine operates at high speed, the magnetic field produced by these harmonic MMF will induce the vortex which can cause loss, temperature rise and even the demagnetization in the permanent magnet.
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Received: 20 May 2009
Published: 04 March 2014
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2010, Vol. 25 
