Electromagnetic design and performance analysis of a two-phase AFPM BLDC motor for the only-pull drive technique

被引:12
作者
Yazdan, Tanveer [1 ]
Kwon, Byung-il [1 ]
机构
[1] Hanyang Univ, Dept Elect Syst Engn, Ansan 15588, South Korea
基金
新加坡国家研究基金会;
关键词
electric potential; magnetic flux; finite element analysis; synchronous motors; machine windings; demagnetisation; brushless DC motors; permanent magnet motors; torque; flux linkage; leakage flux; radial flux; back-EMF; drive technique; RFPM motor; magnets; split-AFPM motor; AF motor; electromagnetic design; two-phase AFPM BLDC motor; two-phase single-air-gap axial flux permanent magnet motor; back-electromotive force waveform; (RFPM) motor; design geometry; desired trapezoidal shape; air-gap flux density; MAGNET SYNCHRONOUS MACHINE; PERMANENT-MAGNET; AXIAL-FLUX; TORQUE RIPPLE; FAULTS; FIELD;
D O I
10.1049/iet-epa.2017.0709
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This study proposes a two-phase single-air-gap axial flux permanent magnet (AFPM) motor that offers a trapezoidal back-electromotive force (EMF) waveform to improve the performance of the only-pull drive technique compared with the radial flux PM (RFPM) motor. The only-pull drive technique provides the benefit of allowing the use of thin magnets in the motor without suffering from irreversible demagnetisation. In the proposed motor, the design geometry is primarily considered to achieve the desired trapezoidal shape of back-EMF. The effects of the geometry are explained with the help of air-gap flux density, flux linkage, and the leakage flux. Both the radial flux and the proposed motor adopt the same design concept and hold equal electromagnetic loadings. The profile of back-EMF and the electromagnetic torque driven by the only-pull drive technique are compared with that of RFPM motor with non-trapezoidal back-EMF. Furthermore, the split configuration is proposed for the AFPM motor to reduce torque ripples. The demagnetisation analysis is performed to confirm the operating point of the magnets in a split-AFPM motor. The results reveal that the AF motor is a good candidate for the only-pull drive technique.
引用
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页码:999 / 1005
页数:7
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