Design and Optimization of a High-Torque-Density Low-Torque-Ripple Vernier Machine Using Ferrite Magnets for Direct-Drive Applications

Gong, Cheng; Deng, Fang

doi:10.1109/tie.2021.3090714

Cited by 30 publications

(4 citation statements)

References 24 publications

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“…Considering concentrated winding, with the same Pr and Pw, the Ns of Model V can be smaller compared with Model I to Model III. Paper [29] demonstrated that the PMs in stator slot openings will introduce larger torque ripple and [30 exhibits that the small stator slot opening will lead to higher output torque.…”

Section: B Selection Of Topologymentioning

confidence: 99%

“…For the topology determined in Section B, the slot/pole combinations of it have been investigated in [29], and it shows that the motor with 12 stator slots, nsp equals to 2, Pr equals to 19 (12/2/19), has symmetric and sinusoidal back electromotive force (EMF). Moreover, it can produce higher torque density.…”

Section: Selection Of Slot/pole Combinationmentioning

confidence: 99%

“…And overall, the efficiency of the machine is relatively low and the temperature rise is not presented. In [29], DPMVM was investigated to apply in automatic guided vehicles, but the slot/pole combination was not investigated in detail. And there is no comparison between conventional PM machines.…”

Section: Introductionmentioning

confidence: 99%

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Design of a Dual-Permanent-Magnet Vernier Machine to Replace Conventional Surface-Mounted Permanent Magnet Motor for Direct-Drive Industrial Turbine Application

et al. 2023

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Surface-mounted permanent magnet motors (SMPMMs) have been widely used in industrial fields. However, when it comes to direct-drive low-speed large-torque fields, SMPMMs have several problems, such as lower slot filling factor, complicated fabrication, low efficiency, and bulky size. Recently, dual-permanent-magnet Vernier motors (DPMVMs) have been investigated due to their high torque density for low-speed direct-drive applications. However, so far, there is little research that demonstrates the application of the DPMVM for real industrial fields and quantitatively compares the performances of the DPMVM and the SMPMM. This paper studies the application of a DPMVM to the direct-drive industrial turbine as a replacement for conventional SMPMM. Rectangular and trapezoidal PMs are first applied to DPMVM in this paper. The performances of the DPMVM are quantitively compared with two typical SMPMMs. One is the design that has the same stator slots as the DPMVM, while the other has the same rotor pole pairs as the DPMVM. Economic costs are considered to form a thorough comparison between DPMVM and SMPMMs. It is revealed that with rectangular and trapezoidal PMs adopted in the DPMVM, the cost of PMs is significantly reduced with little sacrifice of performance. The efficiency of DPMVM is around 12% higher, and the material cost is reduced by 6.87% compared with the SMPMN.

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Section: B Selection Of Topologymentioning

confidence: 99%

Section: Selection Of Slot/pole Combinationmentioning

confidence: 99%

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Design of a Dual-Permanent-Magnet Vernier Machine to Replace Conventional Surface-Mounted Permanent Magnet Motor for Direct-Drive Industrial Turbine Application

et al. 2023

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“…A popular method of investigation is based on frequency analysis of rotating machines (Brock et al, 2016;Han et al, 2022;Łuczak, 2021;Miletic et al, 2022;Peeters et al, 2018;Pindoriya et al, 2018;Ramteke et al, 2022;Strakosch et al, 2021;Wszołek et al, 2020). The option that is mostly used is the fast Fourier transform (FFT) based on the radix-2 (Cooley and Tukey, 1965) or radix-4 algorithm (Corinthios et al, 1975); however, very often, there is no information available concerning the question which FFT algorithm has been employed (Duda et al, 2021;Gong and Deng, 2022). The limitation of FFT analysis is the length of time window.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Vibrations Analysis in Direct Drive Using CWT with Complex Morlet Wavelet

Łuczak

2023

Power Electronics and Drives

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Modern industrial process and household equipment more often use direct drives. According to European policy, Industry 4.0 and new Industry 5.0 need to undertake the effort required to ensure a sustainable, human-centric, and resilient European industry. One of the main problems of rotating machines is mechanical vibrations that can limit the lifetime of the final product or the machine in which they are applied. Therefore, analysis of vibration in electrical drives is crucial for appropriate maintenance of the machine. The present article undertakes an analysis of vibration measured at the laboratory stand with multiple dominant frequencies in the range 50–500 Hz. The fast Fourier transform (FFT) gives information about the frequency component without its time localisation. While the solution made available by the short-time Fourier transform (STFT) is able to overcome the problem of FFT, it still has limitations, particularly in terms of there being a lacuna in time and frequency localisation; accordingly, the need is felt for other methods that can give a good localisation in time and frequency. In the article, the continuous wavelet transform (CWT) was investigated, which requires selection of the wavelet function (kernel of transformation). The complex Morlet wavelet was selected with description of its central frequency and bandwidth. CWT and STFT time-frequency localisation capabilities were compared to investigate data registered from the direct-drive laboratory stand. CWT gives better frequency localisation than STFT even for the same frequency resolution. Vibration frequencies with near-locations were separated in CWT and STFT joined them into one wide pick. To ensure a good extraction of frequency features in electric drive systems, the author, based on analysing the results of the present study, recommends that CWT with complex Morlet wavelet be used instead of STFT.

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Reduction of losses in dual‐permanent‐magnet‐excited Vernier machine by segmented stator for electric aircraft

Ji,

Jia,

Zhao

et al. 2024

IET Electric Power Appl

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The authors present a low‐loss dual‐permanent‐magnet‐excited vernier (DPMEV) machine with segmented stator design to meet the requirements of low iron loss of electric aircraft based on the field modulation theory. The stator topology features and losses of both the original and segmented DPMEV machines are comparatively investigated. Then, the armature air‐gap flux density is deduced by the magnetic motive force‐permeance model, and the influence of each harmonic on the losses are analysed. It is found that the harmonic which produces losses in the original machine reduced greatly after introducing the segmented structure. Furthermore, the electromagnetic performances of two DPMEV machines are comparatively analysed by finite element analysis. Finally, two prototypes of the original and segmented DPMEV machines are built and tested to verify the theoretical analysis.

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Design and Optimization of a High-Torque-Density Low-Torque-Ripple Vernier Machine Using Ferrite Magnets for Direct-Drive Applications

Cited by 30 publications

References 24 publications

Design of a Dual-Permanent-Magnet Vernier Machine to Replace Conventional Surface-Mounted Permanent Magnet Motor for Direct-Drive Industrial Turbine Application

Design of a Dual-Permanent-Magnet Vernier Machine to Replace Conventional Surface-Mounted Permanent Magnet Motor for Direct-Drive Industrial Turbine Application

Mechanical Vibrations Analysis in Direct Drive Using CWT with Complex Morlet Wavelet

Reduction of losses in dual‐permanent‐magnet‐excited Vernier machine by segmented stator for electric aircraft

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