Investigations of Influence of Rotor Geometry on Cogging Torque in Combined Radial and Axial Flux Permanent Magnet Synchronous Motor

  • Authors

    • Gurmeet Singh Sant Longowal Institute of Engineering and Technology, Longowal, Punjab, India
    • Sanjay Marwaha Sant Longowal Institute of Engg. & Tech. Longowal, Distt Sangrur, State Punjab,India
    • Ajat Shatru Arora Sant Longowal Institute of Engg. & Tech. Longowal, Distt Sangrur, State Punjab,India
    https://doi.org/10.14419/ijet.v7i4.22462

    Received date: November 30, 2018

    Accepted date: December 15, 2018

    Published date: August 3, 2019

  • AFPMSM, CRAFPMSM, Cogging Torque, RFPMSM.

  • Abstract

    In this paper, the investigations of cogging torque in combined radial and axial flux permanent magnet synchronous motor (RAFPMSM) has been carried out using 3D FEM modelling. The influence of design parameters and optimizing techniques have been explored to minimize the cogging torque. In the base model of the machine the level of cogging torque, vibration and the noise are elevated due to the additive effect of both radial section and axial section. Both sections have been investigated separately by modelling in FEM. Slot opening, pole arc to pole pitch ratio and the rotor pole configuration are the major design parameters which directly influences the percentage of the cogging torque component in the torque profile of the machine. These design parameters have been targeted and the optimization attempt is made to achieve the goal of minimum Torque Ripple Factor (TRF). The results shown remarkable improvement in the performance from cogging torque view point. The main emphasis has been made on shape of magnets and skewing techniques in both the sections radial and axial. The techniques reflected noticeable improvement in TRF and discernible reduction in vibration. The performance features of high torque density at moderate speed of the machine has been examined and optimized model has been achieved.

  • References

    1. Goga C, Lidija P, Sinclair G, “Cogging torque minimization of disc motor by inserting stator slot closure and magnet skewing”, PRZE-GLĄD ELEKTROTECHNICZNY, vol. 88 (2012), pp.32-35.
    2. Lai C, Feng G, Mukherjee K & Kar NC, “Investigations of the in-fluence of PMSM parameter variations in optimal stator current de-sign for torque ripple minimization” IEEE transactions on energy conversion, vol. 32, no. 3, (2017), pp.1052-1062. https://doi.org/10.1109/TEC.2017.2682178.
    3. Feng G, Lai C & Kar NC, “An analytical solution to optimal stator current design for PMSM torque ripple minimization with minimal machine losses” IEEE transactions on industrial electronics, vol. 64, no. 10, (2017), pp.6055-6065. https://doi.org/10.1109/TIE.2017.2694354.
    4. Feng G, Lai C & Kar NC, “Practical testing solutions to optimal stator harmonic current design for PMSM torque ripple minimiza-tion using speed harmonics” IEEE transactions on power electronics, vol. 33, no. 6, (2018), pp.5181-5191. https://doi.org/10.1109/TPEL.2017.2738613.
    5. Ajay Kumar, Sanjay Marwaha, & Anupma Marwaha, “Finite Ele-ment Analysis of cogging torque reduction techniques in a perma-nent magnet wind turbine generator”, Proceedings of European conference on wind energy, (2004).
    6. Zhu Z Q & HoweD, “Influence of design parameters on cogging torque in permanent magnet machines”, IEEE trans. on energy con-version, Vol. 15, No 4, (2000), pp. 407 - 412. https://doi.org/10.1109/60.900501.
    7. Aydin M, “Magnet skew in cogging torque minimization of axial gap permanent magnet motors”, Proceedings of the international conference on electrical machines, (2008), pp.1-6. https://doi.org/10.1109/ICELMACH.2008.4799945.
    8. Bianchi N & Bolognani S, “Design techniques for reducing the cogging torque in surface mounted PM motors”, IEEE Trans. on Industry Application., vol. 38 (2002), pp.1259 -1265. https://doi.org/10.1109/TIA.2002.802989.
    9. Zhou T & Shen JX, “Cogging torque and operation torque ripple reduction of interior permanent magnet synchronous machines by using asymmetric flux barriers” Proceedings of 20th international conference on electrical machines and systems, (2017), pp.1-6. https://doi.org/10.1109/ICEMS.2017.8056178.
    10. Chetan Vasudeva, Sanjay Marwaha & Shekhar Sharma, "Two-Dimensional static analysis for magnetic flux density of PM linear electric motor", Proceedings of IEEE 1st international conference on power electronics, intelligent control and energy systems (ICPEICES), (2016), pp.3338-3342. https://doi.org/10.1109/ICPEICES.2016.7853687.
    11. Ajay Kumar, Sanjay Marwaha, Amarpal Singh & Anupma Marwaha, “Comparative leakage field analysis of electromagnetic devices us-ing Finite Element and Fuzzy methods”, Expert systems with appli-cations, Elsevier science, vol. 37, (2010), pp. 3827-3834. https://doi.org/10.1016/j.eswa.2009.11.036.
    12. Bramerdorfer G, “Computationally efficient tolerance analysis of the cogging torque of brushless PMSMs”, IEEE transactions on in-dustry applications, vol. 53, no. 14, (2017), pp.3387-3393. https://doi.org/10.1109/TIA.2017.2682797.
    13. Ajay Kumar, Sanjay Marwaha, Anupma Marwaha, “FE analysis for minimization of cogging torque in wind generators”, Journal Indian Inst. Sci., vol. 86, no. 4, (2006), pp. 355-362.
    14. Fei W, & Zhu ZQ, “Comparison of cogging torque reduction in permanent magnet brushless machines by conventional and herring-bone skewing techniques”, IEEE transactions on energy conversion, vol. 28, no. 3, (2013), pp.664-674. https://doi.org/10.1109/TEC.2013.2270871.
    15. Kim KC, “A novel method for minimization of cogging torque and torque ripple for interior permanent magnet synchronous motor,” IEEE trans. magn., vol. 50, no. 2, (2014) pp. 793-796. https://doi.org/10.1109/TMAG.2013.2285234.
    16. Ping Zheng, Jing Zhao, Jie Wang, Zhiyuan Yao & Ranran Liu. “Op-timization of the magnetic pole shape of a permanent magnet syn-chronous motor”. IEEE transactions on magnetics. vol. 43, no. 6, (2007), pp. 2531-2533. https://doi.org/10.1109/TMAG.2007.893631.
    17. Manna M, Marwaha S & Marwaha A “3D FEM analysis of EM force on end winding structure for electrical rotating machines”, Proceedings of the fourth IASTED international conference on cir-cuits, signals, and systems, (2006), pp. 126-130.
    18. Singh G, Arora AS & Marwaha S, “Torque analysis of combined radial and axial flux permanent magnet synchronous motor using FEM”, Proceedings of international conference on computing for sustainable global development , BVICAM, (2017), pp.1-3.
    19. Ozeki M & Shimomura S, “Comparative study of integrated radial-axial flux rotor motor using ferrite magnet”, Proceedings of IEEE conference (2017), pp.1-7. https://doi.org/10.1109/ICEMS.2017.8056393.
    20. Surong Huang, Metin Aydin Thomas & A. Lipo “Torque quality assessment and sizing optimization for surface mounted permanent magnet machines”, IEEE trans. vol.10, no.1, (2001), pp.1603-1610.
    21. Mahmoudi A, Rahim N A & Hew WP, “A comparison between the torus and AFIR axial-flux permanent-magnet machine using finite element analysis," Proceedings of IEEE international conference on electric machine and drives, (2011), pp. 242-247. https://doi.org/10.1109/IEMDC.2011.5994853.
    22. Frank Jurisch, (2004), “Sheel shaped magnet “, United State patent, patent no. US24028945AI.

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  • How to Cite

    Singh, G., Marwaha, S., & Shatru Arora, A. (2019). Investigations of Influence of Rotor Geometry on Cogging Torque in Combined Radial and Axial Flux Permanent Magnet Synchronous Motor. International Journal of Engineering and Technology, 7(4), 7072-7078. https://doi.org/10.14419/ijet.v7i4.22462