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Abstract

This paper evaluates the performance of fractional-slot per pole winding configurations for tubular permanent magnet (PM) machines that can effectively eliminate the most undesirable space harmonics in a simple and cost-effective manner. The benefits of the proposed machine topology winding configurations are illustrated through comparison with 9-slot, 10-pole tubular PM machine developed for a free piston energy converter under the same specification and volumetric constraints. It has been shown that the proposed machine topology results in more than 7 times reduction in the eddy current loss in the mover magnets and supporting tube, and hence avoids potential problem of excessive mover temperature and risk of demagnetization.
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Authors and Affiliations

Jiabin Wang
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Abstract

The classic relationships concerning the harmonic content in the air gap field of three-phase machines are presented in form of series of rotating waves. The same approach is applied to modeling of permanent magnet motors with fractional phase windings. All main reasons of non-sinusoidal shape of flux density distribution, namely, magnets’ shape and their placement, slotting, magnetic saturation and eccentricity are also related to their counterparts in modal-frequency spectrum. The Fourier 2D spectrum of time-stepping finite element solution is confronted with results of measurements, with special attention paid to accuracy of both methods.

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Authors and Affiliations

Pawel Witczak
Witold Kubiak
Marcin Lefik
Jacek Szulakowski
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Abstract

Production deviations have a remarkable effect on the radiated sound of electrical machines, introducing additional signal components besides the fundamental field waves which significantly change and enrich the subjectively perceived sound characteristic. In literature these harmonics are mainly traced back to dynamic eccentricity, which modulates the fundamental fieldwaves. In this paper a thorough mechanic and electromagnetic analysis of a modern, well-constructed traction drive (permanent magnet synchronous machine) is performed to showthat for this typical rotor configuration dynamic eccentricity is negligible. Instead, deviations in the rotor magnetization are shown to be the dominant cause for vibration harmonics.
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Bibliography

[1] Nahlaoui M.A., Steins H., Kulig S., Exnowski S., Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation, Archives of Electrical Engineering, vol. 62, pp. 195–207 (2013), DOI: 10.2478/aee-2013-0015.
[2] Gieras J.F., Wang C., Cho Lai J., Noise of polyphase electric motors, CRC Press Taylor and Francis Group (2006).
[3] Hu Y., Wei H., Chen H., Sun W., Zhao S., Li L., Vibration Study of Permanent Magnet Synchronous Motor Base on Static Eccentricity Model, 22nd International Conference on Electrical Machines and Systems (ICEMS), Harbin, China, pp. 1–5 (2019), DOI: 10.1109/ICEMS.2019.8922162.
[4] LiY.,Wu H.,Xu X., CaiY., Sun X., Analysis on electromechanical coupling vibration characteristics of in-wheel motor in electric vehicles considering air gap eccentricity, Archives of Electrical Engineering, vol. 5, pp. 851–862 (2019), DOI: 10.24425/bpasts.2019.130882.
[5] Lundin U., Wolfbrandt A., Method for Modeling Time-Dependent Nonuniform Rotor/Stator Configurations in Electrical Machines, IEEE Transactions on Magnetics, vol. 45, iss. 7, pp. 2976–2980 (2009), DOI: 10.1109/TMAG.2009.2015052.
[6] Zhang M., Macdonald A., Tseng K.-J., Burt G.M., Magnetic Equivalent Circuit Modeling for Interior Permanent Magnet Synchronous Machine under Eccentricity Fault, 48th International Universities’ Power Engineering Conference (UPEC), Dublin, Ireland, pp. 1–6 (2013), DOI: 10.1109/UPEC.2013.6715044.
[7] Ebrahimi B.M., Faiz J., Roshtkhari M.J., Static-, Dynamic-, and Mixed- Eccentricity Fault Diagnoses in Permanent-Magnet Synchronous Motors, IEEE Transactions on industrial electronics, vol. 56, no. 11, pp. 4727–4739 (2009), DOI: 10.1109/TIE.2009.2029577.
[8] Rosero J.A., Cusido J., Garcia A., Ortega J.A., Romeral L., Broken Bearings and Eccentricity Fault Detection for a Permanent Magnet Synchronous Motor, 32nd Annual Conference on IEEE Industrial Electronics (IECON), Paris, France, pp. 964–969 (2006), DOI: 10.1109/IECON.2006.347599.
[9] Ilamparithi T., Nandi S., Saturation independent detection of dynamic eccentricity fault in salient-pole synchronous machines, IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED), Valencia, Spain, pp. 336–341 (2013), DOI: 10.1109/DEMPED.2013.6645737. [10] Goktas T., Zafarani M., Akin B., Discernment of Broken Magnet and Static Eccentricity Faults in Permanent Magnet Synchronous Motors, IEEE Transactions on Energy Conversion, vol. 31, iss. 2, pp. 578–587 (2016).
[11] Coenen I., van der Giet M., Hameyer K., Manufacturing Tolerances: Estimation and Prediction of Cogging Torque Influenced by Magnetization Faults, IEEE Transactions on Magnetics, vol. 48, iss. 5, pp. 1932–1936 (2012), DOI: 10.1109/TMAG.2011.2178252.
[12] Gasparin L., Fiser R., Cogging torque sensitivity to permanent magnet tolerance combinations, Archives of Electrical Engineering, vol. 62, pp. 449–461 (2013), DOI: 10.2478/aee-2013-0036.
[13] International Organization for Standardization, ISO 1940-1: Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state, Geneva, Switzerland (2003).
[14] https://www.smalley.com/wave-springs/bearing-preload, accessed March 2020.
[15] Henrotte F., Felden M., van der Giet M., Hameyer K., Electromagnetic force computation with the Eggshell method, 14th International Symposium on Numerical Field Calculation in Electrical Engineering (IGTE), Graz, Austria (2010).
[16] Herold T., Franck D., Schröder M., Böhmer S., Hameyer K., Transientes Simulationsmodell für die akustische Bewertung elektrischer Antriebe, e & i Elektrotechnik und Informationstechnik, vol. 133, no. 2, pp. 55–64 (2016).

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Authors and Affiliations

Markus Jaeger
1
Pascal Drichel
2
Michael Schröder
1
Joerg Berroth
2
Georg Jacobs
2
Kay Hameyer
1
ORCID: ORCID

  1. Institute of Electrical Machines (IEM), RWTH Aachen University, Germany
  2. Institute of Systems Engineering and Machine Elements (MSE), RWTH Aachen University, Germany

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