Investigation of Post-Demagnetization Torque Ripple in Fractional-Slot Surface-Mounted PM Wind Power Generators after Short Circuit Faults

Du, Yidong; Dong, Zilin; Zhan, Haolan; Wu, Lijian; Zhou, Kai; Yu, Lei; Fang, Youtong; Sun, Lining

doi:10.1109/tia.2023.3327979

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…Various studies are being conducted to reduce the cogging torque of wind power generators [12][13][14]. Since cogging torque is inversely proportional to the size of the LCM (least common multiple) of the number of poles and the number of slots, the cogging torque can be reduced by applying fractional slot concentrated winding (FSCW) with the number of slots per pole being one or less [15,16]. The cogging torque can be reduced by adjusting the spatial permeance difference through stator and rotor skew, the pole arc ratio of PMs, and tapering [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

A Study on New Straight Shape Design to Reduce Cogging Torque of Small Wind Power Generator

Kang,

Lee,

Ham

et al. 2024

Machines

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In this paper, a 150 W small wind power generator which has a permanent magnet synchronous generator type is proposed with a new straight shape stator and rotor to reduce the cogging torque. The advantages of the proposed structure are introduced through a comparison between the basic and the proposed models. By comparing the pole slot combination of the proposed generator, the combination with optimal cogging torque characteristics was selected. The electromagnetic characteristics of the proposed shape are analyzed for design variables using a finite element analysis of ANSYS 2021 R1 Maxwell. The final model of the proposed structure is designed by considering the cogging torque and electromagnetic characteristics of the generator. The electromagnetic and structural simulations of the final model are performed to satisfy the required performance of the generator and mechanical safety. To verify the FEA results of the final model, a prototype is manufactured, experimented, and compared with the FEA results.

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Section: Introductionmentioning

confidence: 99%

A Study on New Straight Shape Design to Reduce Cogging Torque of Small Wind Power Generator

Kang,

Lee,

Ham

et al. 2024

Machines

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“…Short circuits are one of the most critical faults in SPM machines. Although there are usually circuit breakers in the machine system, they only cut off short-circuit currents at the zero-crossing point, before which the largest transient peak current has already occurred [25]. Among the short-circuit faults, three-phase short circuits (3PSCs) and two-phase short circuits (2PSCs) are two typical types, which are usually caused by inverter failure or control faults [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Short Circuits and Demagnetization in Delta, Star, and Hybrid Winding Connections for Surface-Mounted Permanent Magnet Machines

Chen,

Du,

Zhan

et al. 2024

Machines

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This article comprehensively compares the short circuits and irreversible demagnetization in star, delta, and hybrid winding connections for surface-mounted permanent magnet (SPM) machines, including the three-phase short circuit (3PSC) and two-phase short circuit (2PSC). The analytical and finite element (FE) methods are adopted. It is found that when 3PSC or 2PSC happens, the peak current is the largest in the hybrid connection, which further results in the severest demagnetization. In addition, the delta connection always results in a larger 2PSC peak current than the star connection. Under relatively low permanent magnet (PM) temperature, the delta connection leads to more severe demagnetization than the star connection. However, when PM temperature increases, the opposite condition can occur. As for 3PSC, whether the peak current of the delta connection exceeds that of the star connection is determined by the phase of the third back-EMF harmonic. The delta connection shows higher 3PSC peak current when the third harmonic is in phase with the fundamental back EMF, and conversely, the star connection shows higher peak current. The comparison of demagnetization also heavily depends on PM temperature. Finally, the experiments are conducted to verify the theoretical analysis.

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Investigation of Demagnetization in Halbach Machines

Li,

Zhu,

Brockway

et al. 2024

2024 International Conference on Electrical Machines (ICEM)

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Investigation of Post-Demagnetization Torque Ripple in Fractional-Slot Surface-Mounted PM Wind Power Generators after Short Circuit Faults

Cited by 4 publications

References 21 publications

A Study on New Straight Shape Design to Reduce Cogging Torque of Small Wind Power Generator

A Study on New Straight Shape Design to Reduce Cogging Torque of Small Wind Power Generator

Comparative Study of Short Circuits and Demagnetization in Delta, Star, and Hybrid Winding Connections for Surface-Mounted Permanent Magnet Machines

Investigation of Demagnetization in Halbach Machines

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