Minimization of Cogging Torque in Fractional-Slot Axial Flux Permanent Magnet Synchronous Machine with Conventional Structure

Li, Jian; Choi, Da-Woon; Lee, Sang-Geon; Jang, Jin-Hak; Cho, Yun‐Hyun

doi:10.1109/icef.2012.6310420

Cited by 8 publications

(7 citation statements)

References 8 publications

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“…The paper extends the work done in [4] and [23]. In [4] the effect of the slot-openings on both parallel and trapezoidal-teeth stators was mentioned but not analysed, while in [23] the effect of slot-openings on trapezoidal-teeth stator was analysed.…”

Section: Ieee Transactions On Industrial Electronicsmentioning

confidence: 82%

“…In [4] the effect of the slot-openings on both parallel and trapezoidal-teeth stators was mentioned but not analysed, while in [23] the effect of slot-openings on trapezoidal-teeth stator was analysed. In most cases as proposed in [4], [17], [18] and [24], slot-openings and slots are often displaced as a way of mitigating cogging torque, but not by optimizing their width.…”

Section: Ieee Transactions On Industrial Electronicsmentioning

confidence: 99%

“…Superposition is then used to synthesise the final result. The number of slices cp depends on the purpose of the analysis and the complexity of the machine geometry [23], [29]. The main set back with quasi 3-D FEA is the determination of the necessary number of slices.…”

Section: Analytical Quasi 3-d Analysismentioning

confidence: 99%

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Influence of Slot Openings and Tooth Profile on Cogging Torque in Axial-Flux PM Machines

Wanjiku

Khan

Barendse

et al. 2015

IEEE Trans. Ind. Electron.

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Slotted axial-flux machines have excellent power and torque densities. However, it is difficult to reduce their cogging torque due to the complexity associated with implementing classical techniques. In this paper, slot-opening widths and tooth-profiles will be shown to be significant in mitigating cogging torque in these machines. In particular, varying the slot-opening reduced it by 52 %, whereas a paralleltooth (rectangular) profile lowered it by 24 %, when compared to a conventional trapezoidal-tooth profile. An analytical quasi 3-D analysis was formulated and used to analyse and determine cogging torque. It was validated numerically and experimentally. Its versatility is in its ability to analyse different shapes of poles and slot-openings, which can be extended to model airgap nonuniformities. The paper also presents cogging torque minimization techniques that maintain the ease of manufacture of the parallelteeth stator. Experimental results showed a 73 % and 48 % reduction in cogging torque; achieved by the use of alternating pole-arcs and skewed poles. NOMENCLATURE aSlot-opening depth 0278-0046 (c)

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Section: Ieee Transactions On Industrial Electronicsmentioning

confidence: 82%

Section: Ieee Transactions On Industrial Electronicsmentioning

confidence: 99%

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Influence of Slot Openings and Tooth Profile on Cogging Torque in Axial-Flux PM Machines

Wanjiku

Khan

Barendse

et al. 2015

IEEE Trans. Ind. Electron.

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“…Numerous methods for cogging torque reduction in PM machines are available in literature [1][2][3][4][5][6][7][8][9][10]. These methods may be classified under two categories, namely, stator modification techniques and rotor modification techniques.…”

Section: Introductionmentioning

confidence: 99%

“…These methods may be classified under two categories, namely, stator modification techniques and rotor modification techniques. The former technique includes stator slot skewing [1][2][3], slot opening variation [1,4], tooth shaping [4], dummy slots/tooth [1], fractional slots per pole [1,9] and [10], etc. The later method comprises magnet shaping [5], optimizing magnet pole arc to pole pitch ratio [1], pole arc offset [6], narrowing rotor pole embrace [7], pole-slot combination [1,8], magnet skewing, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rotor Magnet Shapes on Performance of Axial Flux Permanent Magnet Machines

Kumar¹,

Srivastava²

2018

PIER C

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Abstract-Axial flux Permanent Magnet (AFPM) machines, due to its high torque capability, high power density and compact size, are the most suitable candidates for in-wheel Electric Vehicle application. However, the presence of cogging torque in AFPM machines, resulting from the interaction of PMs and stator slots, introduces torque ripples, noise and vibrations which deteriorates the performance of the machine. To overcome this, several techniques for cogging reduction are utilized. Out of various techniques, rotor magnet shape variation is most commonly utilized. This paper investigates the effect of some preferred magnet shaping techniques in AFPM machines on several performance parameters such as magnetic flux density distribution in air gap, cogging torque, flux linkage, no loadinduced emf, emf harmonics, electromagnetic torque and torque ripple. These parameters were analyzed using 3-D Finite Element Method (FEM) based simulations. It was found that a maximum cogging reduction by 62.49% and output torque ripple by 63.25% were obtained by using short-pitched and skewed rotor magnets. This also resulted in a reduction of induced emf by 14.18% and electromagnetic torque by 15.17%.

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A new hybrid method for reducing cogging torque in the AFPM wind generator

Hüner

Mutlu

2021

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Minimization of Cogging Torque in Fractional-Slot Axial Flux Permanent Magnet Synchronous Machine with Conventional Structure

Cited by 8 publications

References 8 publications

Influence of Slot Openings and Tooth Profile on Cogging Torque in Axial-Flux PM Machines

Influence of Slot Openings and Tooth Profile on Cogging Torque in Axial-Flux PM Machines

Influence of Rotor Magnet Shapes on Performance of Axial Flux Permanent Magnet Machines

A new hybrid method for reducing cogging torque in the AFPM wind generator

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