|Table of Contents|

[1] Li Yibo, Huang Jiacai, Zhu Zhiying,. Analysis of pole-slot combination of novel flux-adjustablepermanent magnet adjustable speed drive with fixed air-gap [J]. Journal of Southeast University (English Edition), 2023, 39 (1): 74-80. [doi:10.3969/j.issn.1003-7985.2023.01.009]

Analysis of pole-slot combination of novel flux-adjustablepermanent magnet adjustable speed drive with fixed air-gap()

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

2023 1
Research Field:
Electrical Engineering
Publishing date:


Analysis of pole-slot combination of novel flux-adjustablepermanent magnet adjustable speed drive with fixed air-gap
Li Yibo1 Huang Jiacai1 Zhu Zhiying2
1Industrial Center/School of Innovation and Entrepreneurship, Nanjing Institute of Technology, Nanjing 211167, China
2School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
permanent magnet adjustable speed drive pole-slot combination analytical model finite element method squirrel cage rotor torque characteristics
To further improve the output torque of a permanent magnet adjustable speed drive(PMASD)and simplify the mechanical operation mechanism required in the speed regulation process, a flux-adjustable PMASD with a fixed air-gap is proposed by combining the slotted conductor rotor(CR)structure with the mechanical flux adjustment method. First, the structural characteristics and operating principle of the proposed PMASD are described. Then, the key factors affecting its basic electromagnetic characteristics are analyzed based on a theoretical model and the finite element method. The combination between the number of permanent magnet poles and the number of CR slots is mainly studied. Finally, the optimal pole-slot matching scheme was obtained with the goal of the maximum output torque and minimum torque ripple, and the principle prototype was manufactured to obtain its speed regulation characteristics, power, loss, and efficiency. The analysis results are verified comprehensively. The results show that the torque ripple is large when the slot number per pole pair is even, whereas it is smaller when the slot number per pole pair is odd. Moreover, the torque ripple decreases with the increase in the slot number per pole pair.


[1] Xue W L, Tang W, Xu N, et al. Analysis of current situation of energy and electricity consumption and prediction of energy efficiency development during the 14th five-year plan [J].Power Demand Side Management, 2020, 22(6): 11-16.DOI:10.3969/j.issn.1009-1831.2020.06.003. (in Chinese)
[2] Jitendra S, Binoy K, Krishna M. Innovations in variable frequency drives and its implication in reducing carbon footprint [J].Encyclopedia of Renewable and Sustainable Material, 2020, 3: 534-544.DOI: 10.1016/B978-0-12-803581-8.11010-0.
[3] Zhang C H, Huang K, Xu X M. Application of permanent magnetic speed regulating and variable frequency speed regulating technology in circulating water pump of coal preparation plant [J]. China Energy and Environmental Protection, 2018, 40(2): 144-149. DOI:10.19389/j.cnki.1003-0506.2018.02.029. (in Chinese)
[4] Wallace A, Von Jouanne A. Industrial speed control: Are PM couplings an alternative to VFDs? [J].IEEE Industry Applications Magazine, 2001, 7(5): 0-63.DOI: 10.1109/2943.948533.
[5] Lubin T, Rezzoug A. Steady-state and transient performance of axial-field eddy-current coupling [J].IEEE Transactions on Industrial Electronics, 2015, 62(4): 2287-2296.DOI: 10.1109/TIE.2014.2351785.
[6] Qu Y Q. Application of high-voltage variable-frequency regulating speed technology in energy saving transformation of thermal power plants [J].Energy and Energy Conservation, 2022, 1:76-78. DOI:10.16643/j.cnki.14-1360/td.2022.01.022. (in Chinese)
[7] Jiao Q F. Research on speed regulation and energy saving transformation of auxiliary circulating water pump [J].Energy and energy conservation, 2017, 2: 74-76. DOI:10.16643/j.cnki.14-1360/td.2017.02.032(in Chinese)
[8] Zhu Z G. Selection of high-voltage frequency converter and fluid coupler [J].Metallurgical Industry Automation, 2018, 42(2): 68-70. DOI:10.3969/j.issn.1000-7059.2018.02.015. (in Chinese)
[9] You R, Chai J, Sun X, et al. Variable speed wind turbine based on electromagnetic coupler and its experimental measurement [C]//Proceedings of 2014 IEEE PES Gen Meeting. National Harbor, MD, USA, 2014: 1-5.DOI: 10.1109/PESGM.2014.6939318.
[10] Yang C J, Lu Y G, Li Z B, et al. Finite element analysis of transient air-gap magnetic field for deep bar squirrel cage asynchronous magnetic coupling [J].Journal of Jiangsu University(Natural Science Edition), 2012, 33(2): 193-198. DOI:10.3969/j.issn.1671-7775.2012.02.014. (in Chinese)
[11] Dai X, Liang Q H, Cao J Y, et al. Analytical modeling of axial-flux permanent magnet eddy current couplings with a slotted conductor topology [J].IEEE Transactions on Magnetics, 2016, 52(2): 1-15.DOI: 10.1080/15325008.2015.1070934.
[12] Li Y B, Lin H Y, Tao Q C, et al. Analytical analysis of an adjustable-speed permanent magnet eddy-current coupling with a non-rotary mechanical flux adjuster [J].IEEE Transactions on Magnetics, 2019, 55(6): 1-5.DOI: 10.1109/TMAG.2019.2893458.
[13] Li Y B, Lin H Y, Yang H. A novel squirrel-cage rotor permanent magnet adjustable speed drive with a non-rotary mechanical flux adjuster [J].IEEE Transactions on Energy Conversion, 2020, 36(2): 1036-1044.DOI: 10.1109/TEC.2020.3028881.
[14] Li Y B, Huang J C, Gao F Z, et al. The analytical comparative analysis of electromagnetic characteristics of four typical radial flux permanent magnet eddy current couplers [J].Energies, 2021, 14(24): 8407.DOI: 10.3390/en14248407.
[15] Hwang S M, Eom J B, Hwang G B, et al. Cogging torque and acoustic noise reduction in permanent magnet motors by teeth pairing [J].IEEE Transactions on Magnetics, 2000, 36(5): 3144-3146.DOI: 10.1109/20.908714.
[16] Li F, Wang K, Gao P W, et al. Investigation of cogging torque and torque ripple in consequent pole permanent magnet machine with different slot/pole number combinations [J].Proceedings of the CSEE, 2022, 42(17): 6491-6498. DOI:10.13334/j.0258-8013.pcsee.211344. (in Chinese)


Biography: Li Yibo(1989—), male, doctor, lecturer, ybli@njit.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.52107048), Jiangsu Provincial Natural Science Foundation of Higher Education(No.21KJB470021), the Scientific Research Foundation for the High-level Personnel of Nanjing Institute of Technology(No. YKJ2019107).
Citation: Li Yibo, Huang Jiacai, Zhu Zhiying. Analysis of pole-slot combination of novel flux-adjustable permanent magnet adjustable speed drive with fixed air-gap[J].Journal of Southeast University(English Edition), 2023, 39(1):74-80.DOI:10.3969/j.issn.1003-7985.2023.01.009.
Last Update: 2023-03-20