Permanent magnet structure optimization for cogging torque reduction of outer rotor type radial flux permanent magnet generator

Yoo, Jin-Hyung; Park, Chang-Seok; Jung, Tae-Uk

doi:10.1109/iemdc.2017.8002398

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…For instance, the permanent magnet synchronous generators (PMSGs) with high power densities are used in increasing scales in the commercial sector. Since PMSGs can be connected to *Sorumlu Yazar (Corresponding Author) e-posta : adalcali@bandirma.edu.tr 224 wind turbines without any gear system, they have been often preferred in wind power plants with low and medium power range [9]. By the discovery of highperformance Neodymium-Iron-Boron magnets and developments in power electronic, permanent magnet (PM) synchronous machines have shown rapid development.…”

Section: Introductionmentioning

confidence: 99%

“…In a similar study, aimed the exploration of the effect of the structures with the rounded edge magnet on the cogging torque of the PMSG, an optimization on the air gap was applied. With the proposed method, the change in the reluctance was minimized and the cogging torque value was reduced by 40% [9]. It was determined that the magnetic pole eccentric reduced the torque by reducing the air-gap harmonic components.…”

Section: Introductionmentioning

confidence: 99%

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Cogging Torque Minimization Using Skewed and Separated Magnet Geometries

et al. 2020

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Çalışmada, 2,5 kW gücünde 14 kutuplu, 84 oluklu sabit mıknatıslı senkron generatörün (SMSG) analitik tasarımı, analizi ve optimizasyonu gerçekleştirilmiştir. Bu tasarıma ait verim, tork, vuruntu torku ve manyetik akı yoğunluğu gibi performans özelikleri değerlendirilmiştir. Ardından mıknatıs geometrisinin vuruntu torkuna etkisini incelemek amacıyla ilgili generatörün 3 boyutlu modeli çıkartılmıştır. Bu bağlamda bölünmüş ve kaykı/çarpıklık (skew) verilmiş mıknatıs yapılarının etkileri araştırılmıştır. İlk tasarımda mıknatıs tek parça modellenmiş ve vuruntu torkunun etkin değeri 436,75 mNm olarak bulunmuştur. İkinci tasarımda mıknatıs yüzeyi boyunca belli ölçüde çarpık bir yarık açılmış ve bu işlem vuruntu torkunu 434,58 mNm değerine düşürmüştür. Diğer tasarımda, birinci tasarımdaki mıknatıs iki parçaya bölünmüş ve bölünen mıknatıslar çarpık şekilde tekrar birleştirilmişlerdir. Böylece vuruntu torkunun değeri 159,60 mNm olarak bulunmuştur. Son olarak, son modeldeki mıknatıs geometrisine belli ölçülerde iki tane yarık açılarak vuruntu torku 89,95 mNm'e kadar düşürülmüştür. Elde edilen sonuçlardan, son tasarımın, ilk tasarıma kıyasla vuruntu torku değerinde %80'e varan bir iyileşme sağladığı sonucuna varılmıştır.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cogging Torque Minimization Using Skewed and Separated Magnet Geometries

et al. 2020

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“…Another CT reduction technique, i.e. is by employing the fractional slot number has been investigated by scholars in [12], [18], [29], [35], magnet slotted studied in references [5], [18], [22], [23], [40].…”

Section: Introductionmentioning

confidence: 99%

Novel of Cogging Torque Reduction Technique for Permanent Magnet Generator by Compounding of Magnet Edge Shaping and Dummy Slotting in Stator Core

Nur

Joe

Siregar

2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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This paper dealt with the investigation and implementation of the cogging torque reduction technique in permanent magnet generators with a fractional slot stator/rotor combination of 24 slot/18 pole structure. A novel of cogging torque technique in a permanent magnet generator was developed and proposed in the paper. In the study, the cogging torque reduction technique was based on the compounding of two cogging torque reduction techniques, i.e., the magnet edge shaping with dummy slotting in the stator core of the fractional slot number. By employing the CT reduction technique proposed, effects on the decreasing of tangential flux density in the air gap of the permanent magnet generator, while the normal flux density almost remained constant. The tangential flux density is one important parameter regarding the peak of cogging torque in permanent magnet generator or other electrical machine structure. The normal and tangential flux have been analyzed. The cogging torque of the permanent magnet generator was analyzed and presented in the paper. By compounding both cogging torque reduction techniques, i.e., magnet edge shaping and dummy slotting in stator teeth have been expected to achieve the cogging torque reduction. The electromagnetic performance of the permanent magnet generator was performed using a finite element analysis of FEMM 4.2. It has been proved that by combining of magnet edge shaping and dummy slotting in stator teeth can reduce the cogging torque of permanent magnet generator significantly. It has been found that the cogging torque reduction for the proposed structure around 98.08 % compared with the initial structure.

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