Declining Cogging Torque Technique of an Integral Slot Number for Permanent Magnet Machines
Abstract
The existence of cogging torque in electric equipment has been considered undesirable. This kind of friction in the air-gap impacts the alignment of flux and the stator slots, resulting in the observed outcome. Consequently, the imposition of restrictions on the rotation of the rotor is employed to generate electrical energy. This research endeavor primarily aims to mitigate the cogging torque of electrical machinery. The current utilization involves employing a total of 3 permanent magnet synchronous machines, often known as inset PMMs, which possess a slot count of 24 and a pole count of 8. The employed technique involves the integration of an optimal pole arc method in conjunction with the implementation of slots cut into the magnet's edge. The machine model under investigation has two fundamental variants, namely Models 1 and 2. These models are equipped with 1one-step slotted (OSS) and 2two-step slotted (TSS) edges on each magnet, in addition to pole arc optimization. The simulation was conducted using the Finite Element Method Magnetics (FEMM) 4.2 software together with LUA scripts, with a focus on rotor rotation ranges of 1 degree. Model 2 exhibited a decrease in cogging torque of 0.01 Nm, whereas Model 1 demonstrated a reduction of 0.015 Nm, and the basic model had a decrease of 0.02 Nm. When implementing a dual-layered cutting edge on a magnet and attempting to optimize its pole arc, it is imperative to consider that the cogging torque's peak magnitude becomes substantially diminished or entirely eliminated.
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F. Scuiller, "Magnet shape optimization to reduce pulsating torque for a five-phase permanent-magnet low-speed machine," IEEE Transactions on Magnetics, vol. 50, pp. 1-9, 2014.
M. Chabchoub, I. B. Salah, G. Krebs, R. Neji, and C. Marchand, "PMSM cogging torque reduction: Comparison between different shapes of magnet," In Proc. IEEE International Conference on Renewable Energies and Vehicular Technology, 2012, pp. 206-211.
W. Lijian, J. Wanbing, N. Jian, and Y. Jianping, "A cogging torque reduction method for surface mounted permanent magnet motor," in Proc. IEEE International Conference on Electrical Machines and Systems, 2007, pp. 769-773.
W. Wang, H. Ma, X. Qiu, and J. Yang, "A calculation method for the on-load cogging torque of permanent magnet synchronous machine," IEEE Access, vol. 7, pp. 106316-106326, 2019.
A. Wang, D. Ma, and S. Shu, "Influence of magnet pole shifting on cogging torque for PMSG application," In Proc. IEEE International Conference on Electrical Machines and Systems, 2014, pp. 495-499.
Z. Q. Zhu and Y. Xiao, "Novel magnetic-field-shifting techniques in asymmetric rotor pole interior PM machines with enhanced torque density," IEEE Transactions on Magnetics, vol. 58, no. 2, pp. 1-10, 2022.
H. Yang, C. Qian, W. Wang, H. Lin, Z. q. Zhu, S. Niu, et al., "A novel asymmetric-magnetic-pole interior PM machine with magnet-axis-shifting effect," IEEE Transactions on Industry Applications, vol. 57, no. 6, pp. 5927-5938, 2021.
T. A. Anuja, M. A. N. Doss, R. Senthilkumar, K. S. Rajesh, and R. Brindha, "Modification of pole pitch and pole arc in rotor magnets for cogging torque reduction in BLDC motor," IEEE Access, vol. 10, pp. 116709-116722, 2022.
J. Gao, G. Wang, X. Liu, W. Zhang, S. Huang, and H. Li, "Cogging torque reduction by elementary-cogging-unit shift for permanent magnet machines," IEEE Transactions on Magnetics, vol. 53, no. 11, pp. 1-5, 2017.
Z. Q. Zhu and D. Howe, "Influence of design parameters on cogging torque in permanent magnet machines," IEEE Transactions on Energy Conversion, vol. 15, no. 4, pp. 407-12. 2000.
T. Nur and M. Mulyadi, "Improve cogging torque method in inset-permanent magnet synchronous machine," In Proc. IEEE International Conference on Applied System Invention, 2018, pp. 1211-1213.
E. Brescia, M. Palmieri, G. L. Cascella, and F. Cupertino, "Optimal tooth tips design for cogging torque suppression of permanent magnet machines with a segmented stator core," In Proc. IEEE International Conference on Electrical Machines, 2020, pp. 1930-1936.
L. Jia, M. Lin, W. Le, N. Li, and Y. Kong, "Dual-skew magnet for cogging torque minimization of axial flux PMSM with segmented stator," IEEE Transactions on Magnetics, vol. 56, no. 2, pp. 1-6, 2020.
E. Fleurot, F. Scuiller, and J. F. Charpentier, "An analytical approach to estimate the cogging torque in segmented stator synchronous permanent magnet machines with large angular gaps," In Proc. IEEE International Conference on the Computation of Electromagnetic Fields, 2019, pp. 1-4.
L. Xu and Y. Xu, "Analysis and optimization of cogging torque in yokeless and segmented armature axial-flux permanent-magnet machine with soft magnetic composite core," In Proc. IEEE International Magnetics Conference, 2018, pp. 1-1.
L. Xu, Y. Xu, and J. Gong, "Analysis and optimization of cogging torque in yokeless and segmented armature axial-flux permanent-magnet machine with soft magnetic composite core," IEEE Transactions on Magnetics, vol. 54, no. 11, pp. 1-5, 2018.
A. Keyhani, C. B. Studer, T. Sebastian, S. K. Murthy, "Study of cogging torque in permanent magnet machines," Electric Machines & Power Systems, vol. 27, no. 7, pp. 665-678, 1997.
L. Dosiek and P. Pillay, "Cogging torque reduction in permanent magnet machines," IEEE Transactions on Industry Applications, vol. 43, no. 6, pp. 1565-1571, 2007.
R. Lateb, N. Takorabet, and F. Meibody-Tabar, "Effect of magnet segmentation on the cogging torque in surface-mounted permanent-magnet motors," IEEE Transactions on Magnetics, vol. 42, no. 3, pp. 442-445, 2006.
R. R. Bakiev, A. F. Schevchenko, and D. Y. Babitsky, "Methods for reducing cogging torque in permanent magnet synchronous motors," IOP Conference Series: Earth and Environmental Science, vol. 194, no. 2, p. 022002, 2018.
M. A. Baig, J. Ikram, A. Iftikhar, S. S. H. Bukhari, N. Khan, and J. S. Ro, "Minimization of cogging torque in axial field flux switching machine using arc shaped triangular magnets," IEEE Access, vol. 8, pp. 227193-227201, 2020.
N. Bianchi and S. Bolognani, "Design techniques for reducing the cogging torque in surface-mounted PM motors," IEEE Transactions on Industry Applications, vol. 38, no. 5, pp. 1259-1265, 2002.
G. Cvetkovski, L. Petkovska, and P. Lefley, "Topological modifications in function of cogging torque reduction of permanent magnet synchronous motor," Przeglad Elektrotechniczny, vol. 90, no. 12, pp. 113-116, 2014.
D. Sato, R. Maejima, W. Kitagawa, and T. Takeshita, "Cogging torque reduction by using double skew of permanent magnets in axial gap motor," In Proc. IEEE International Conference on Electrical Machines, 2022, pp. 212-218.
S. Nian, L. Zhu, X. Luo, and Z. Huang, "Analytical methods for optimal rotor step-skewing to minimize cogging torque in permanent magnet motors," In Proc. IEEE International Conference on Electrical Machines and Systems, 2019, pp. 1-5.
P. T. Luu, J. Y. Lee, W. Hwang, and B. C. Woo, "Cogging Torque Reduction Technique by Considering Step-Skew Rotor in Permanent Magnet Synchronous Motor," In Proc. IEEE International Conference on Electrical Machines and Systems, 2018, pp. 219-223.
O. Ocak and M. Aydin, "An innovative semi-FEA based, variable magnet-step-skew to minimize cogging torque and torque pulsations in permanent magnet synchronous motors," IEEE Access, vol. 8, pp. 210775-210783, 2020.
Y. Ueda and H. Takahashi, "Cogging torque reduction on transverse-flux motor with multilevel skew configuration of toothed cores," IEEE Transactions on Magnetics, vol. 55, no. 7, pp. 1-5, 2019.
Y. Ueda and H. Takahashi, "Transverse-flux motor design with skewed and unequally distributed armature cores for reducing cogging torque," IEEE Transactions on Magnetics, vol. 53, no. 11, pp. 1-5, 2017.
X. Ge, Z. Q. Zhu, G. Kemp, D. Moule, and C. Williams, "Optimal step-skew methods for cogging torque reduction accounting for three-dimensional effect of interior permanent magnet machines," IEEE Transactions on Energy Conversion, vol. 32, no. 1, pp. 222-232, 2017.
T.-W. Kim and J.H. Chang, "Influence of cogging torque reduction method on torque ripple in a surface-mounted permanent magnet synchronous motor," Journal of Magnetics, vol. 17, no. 2, pp. 109-114, 2012.
F. Liu, X. Wang, Z. Xing, A. Yu, and C. Li, "Reduction of cogging torque and electromagnetic vibration based on different combination of pole arc coefficient for interior permanent magnet synchronous machine," CES Transactions on Electrical Machines and Systems, vol. 5, no. 4, pp. 291-300, 2021.
V. Simón-Sempere, A. Simón-Gómez, M. Burgos-Payán, and J. R. Cerquides-Bueno, "Optimisation of magnet shape for cogging torque reduction in axial-flux permanent-magnet motors," IEEE Transactions on Energy Conversion, vol. 36, no. 4, pp. 2825-2838, 2021.
L. Xiao, J. Li, R. Qu, Y. Lu, R. Zhang, and D. Li, "Cogging Torque analysis and minimization of axial flux PM machines with combined rectangle-shaped magnet," IEEE Transactions on Industry Applications, vol. 53, no. 2, pp. 1018-1027, 2017.
M. Nakano, Y. Morita, and T. Matsunaga, "Reduction of cogging torque due to production tolerances of rotor by using dummy slots placed partially in axial direction," IEEE Transactions on Industry Applications, vol. 51, no. 6, pp. 4372-4382, 2015.
G. Zhao, W. Hua, X. Zhu, and G. Zhang, "The influence of dummy slots on stator surface-mounted permanent magnet machines," IEEE Transactions on Magnetics, vol. 53, no. 6, pp. 1-5, 2017.
L. Hao, M. Lin, D. Xu, N. Li, and W. Zhang, "Cogging torque reduction of axial-field flux-switching permanent magnet machine by rotor tooth notching," IEEE Transactions on Magnetics, vol. 51, no. 11, pp. 1-4, 2015.
X. Wan, S. Yang, Y. Li, Y. Shi, and J. Lou, "Minimization of cogging torque for V-type IPMSM by the asymmetric auxiliary slots on the rotor," IEEE Access, vol. 10, pp. 89428-89436, 2022.
D. Wang, C. Peng, B. Wang, Z. Feng, and J. Li, "Permanent magnet synchronous machines with nonuniformly distributed teeth," IEEE Transactions on Industrial Electronics, vol. 69, no. 9, pp. 8705-8715, 2022.
J. Wanjiku, M. A. Khan, P. S. Barendse, and P. Pillay, "Influence of slot openings and tooth profile on cogging torque in axial-flux PM machines," IEEE Transactions on Industrial Electronics, vol. 62, no. 12, pp. 7578-7589, 2015.
D. Wu and Z. Q. Zhu, "Design tradeoff between cogging torque and torque ripple in fractional slot surface-mounted permanent magnet machines," IEEE Transactions on Magnetics, vol. 51, no. 11, pp. 1-4, 2015.
T. Nur and Herlina, "Investigation of the implement the shoe height and slot opening width on decreasing the peak of cogging torque in PMSG," In Proc. IEEE International Conference on Electrical Engineering and Computer Science, 2019, pp. 411-415.
J. Ling and T. Nur, "Study of magnetics performance of inset permanent magnet synchronous machine (Inset-PMSM) using finite element method," Applied Mechanics and Materials, vol. 260, pp. 554-558, 2012.
D. Meeker, "Finite Element Method Magnetics: Magnetics Tutorial," femm.info, Dec. 14, 2013. [Online]. Available: https://www.femm.info/wiki/MagneticsTutorial. [Accessed June, 20 2022].
J. Škofic and M. Boltežar, "Numerical modelling of the rotor movement in a permanent-magnet stepper motor," IET Electric Power Applications, vol. 8, no. 4, pp. 155-163, 2014.
DOI: https://doi.org/10.17529/jre.v19i4.30028
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