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Search Results (3)

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Keywords = permanent magnet governor

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14 pages, 9181 KiB  
Article
Simulation and Experimental Study of Arc Model in a Low-Voltage Distribution Network
by Binbin Zhang, Jiaqing Zhang, Yifeng Cheng, Qixu Chen and Qian Zhang
Energies 2025, 18(2), 420; https://doi.org/10.3390/en18020420 - 18 Jan 2025
Viewed by 1173
Abstract
Using the low-voltage and low-current platform (220 VAC-10 A), this paper selected the Mayr arc theoretical model and the improved control theory model as a theoretical basis and built a single-phase low-voltage AC series arc model based on Simulink. The simulation results showed [...] Read more.
Using the low-voltage and low-current platform (220 VAC-10 A), this paper selected the Mayr arc theoretical model and the improved control theory model as a theoretical basis and built a single-phase low-voltage AC series arc model based on Simulink. The simulation results showed that arc dissipation power directly determined arc voltage amplitude, arc time constant influenced arc voltage waveform, and arc current was mainly determined by load resistance. Because the arc length parameter can be set by the improved control arc theory model, the arc can be drawn only at the micro-distance of two electrodes, which is more suitable for describing the arc characteristics of low voltage and low current. A scheme of large ratio reducer for permanent magnet brushless DC motor was developed, which was combined with the stepless governor controlled by PWM and the positive and negative switch to realize the adjustment of the two-electrode micro-distance. The collection and analysis of arc voltage and arc current under pure resistance, resistive load, and multi-branch load were completed. The experimental results also verified that the Mayr arc and improved control theory arc have good accuracy in describing low voltage and low current characteristics, which improves data support for later fault identification and removal. Full article
(This article belongs to the Special Issue Advances in Power Distribution Systems)
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31 pages, 7907 KiB  
Review
A Review of Recent Developments in Permanent Magnet Eddy Current Couplers Technology
by Jiaxing Wang, Dazhi Wang, Sihan Wang, Tailai Tong, Lisong Sun, Wenhui Li, Deshan Kong, Zhong Hua and Guofeng Sun
Actuators 2023, 12(7), 277; https://doi.org/10.3390/act12070277 - 7 Jul 2023
Cited by 15 | Viewed by 4882
Abstract
Permanent magnet eddy current couplers (PMECCs) have the characteristics of contactless torque transmission, removal of torque ripple, smooth dynamic process, and adjustable speed, and can be used as couplings, dampers, brakes, and speed governors. Their applications in industry, vehicles, and energy fields are [...] Read more.
Permanent magnet eddy current couplers (PMECCs) have the characteristics of contactless torque transmission, removal of torque ripple, smooth dynamic process, and adjustable speed, and can be used as couplings, dampers, brakes, and speed governors. Their applications in industry, vehicles, and energy fields are gradually expanding. At the same time, the requirements for the torque density and dynamic performance of PMECCs are increasing. Therefore, a large amount of research work has focused on the fast and accurate modeling, design, and optimization of PMECCs. This paper provides a survey on the development of PMECCs technology. The main topics include the structure and classification of PMECCs, modeling methods, loss and heat transfer analysis modeling, and optimization design. In addition, this paper shows the future trends of PMECCs research. All the highlighted insights and suggestions of this review will hopefully lead to increasing efforts toward the model’s construction and the optimal design of PMECCs for future applications. Full article
(This article belongs to the Section High Torque/Power Density Actuators)
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19 pages, 9130 KiB  
Article
Transmission Performance of Halbach Array Cylindrical Permanent Magnet Governor
by Yonglong Zhu, Hai Wang, Henian Li, Chunlai Yang and Jingsong Gui
Electronics 2023, 12(5), 1161; https://doi.org/10.3390/electronics12051161 - 27 Feb 2023
Cited by 4 | Viewed by 3136
Abstract
A novel cylinder permanent magnet governor (CPMG) with Halbach segmentation is proposed in this paper. In order to improve the transmission performance of the CPMG, different permanent magnet (PM) arrangement methods are adopted. To achieve a fair comparison result, all the PMs are [...] Read more.
A novel cylinder permanent magnet governor (CPMG) with Halbach segmentation is proposed in this paper. In order to improve the transmission performance of the CPMG, different permanent magnet (PM) arrangement methods are adopted. To achieve a fair comparison result, all the PMs are of the same size. The main magnetic fluxes are considered to obtain a comprehensive equivalent magnetic circuit model of the CPMG with Halbach array and analytical output torque that is calculated. The analytical method of transmitted torque for CPMG is then presented. Additionally, the effect of the average output torque of CPMG under parameters of the thickness of the copper rings, the slip rate and the effective coupling of the copper rings are investigated. Finally, the prototype platform is ready for testing on the field. The results were consistent with the results of the simulation, and the error was kept within the range of 5%. This research can provide a theoretical and practical reference for the optimal design of the transmission characteristic of CPMG. Full article
(This article belongs to the Topic Designs and Drive Control of Electromechanical Machines)
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