This paper deals with the influence of the AC machine pole number on vibrations and noise of electromagnetic origin. First, rules of design of AC machines are reminded, pointing out the influence of the pole number. Then, the origin of magnetic vibrations and noise is explained. Analytical mechanical relations are given, allowing to estimate vibrations and noise of a machine. After that, the influence of the pole number is studied: on the machine radius, on the stator deformations, on the mechanical resonance frequencies and on the noise. The conclusions underline that machines with high pole number have stator vibrations of high amplitude. Calculations compare three machines with different pole number and fed at different frequencies. The conclusion is that, at the same speed and working power, machines with high pole number fed at high frequency are noisier than those with low number of poles fed at low frequency. Practical experiments illustrate these theoretical considerations.
2. Belot, A., Calcul des machines électriques tournantes, cours de l'Ecole Supérieure d'Electricité, 1976.
3. Hubert, A., "Contribution à l'étude des bruits acoustiques générés lors de l'association machines électriques --- convertisseurs statiques de puissances --- application à la machine asynchrone," Ph.D. Dissertation, Université des Technologies de Compiègne, Compiègne, France, Dec. 2000.
4. Le Besnerais, J., V. Lanfranchi, M. Hecquet, R. Romary, and P. Brochet, "Optimal slot opening width for magnetic noise reduction in induction motors," IEEE Trans. Energy Convers., Vol. 24, No. 4, 869-874, Dec. 2009.
5. Lecointe, J. P., B. Cassoret, and J. F. Brudny, "Distinction of toothing and saturation effects on magnetic noise of induction motors," Progress In Electromagnetics Research, Vol. 112, 125-137, 2011.
6. Cassoret, B., R. Corton, D. Roger, and J. F. Brudny, "Magnetic noise reduction of induction machines," IEEE Transactions on Power Electronics, Vol. 18, No. 2, 570-579, US, Mar. 2003.
7. Jordan, H., Geräuscharme Elektromotoren, W. Girardet, Essen, 1950.
8. Timar, P. L., A. Fazekas, J. Kiss, A. Miklos, and S. J. Yang, Noise and Vibration of Electrical Machines, Elsevier, 1989.
9. Nee, H. and F. Gustavson, "On the choice of diameter length ratio, slot-tooth ratio and pole number of variable speed induction motor drives," Proceedzngs of ICEM'96, Vol. 3, 290-295, Vigo, Spain, Sep. 10-12, 1996.
10. Notelet, F. and J. F. Brudny, "Calcul des machines électriques," Revue 3E.I: La Machine Asynchrone, No. 1, 2-16, 1994.
11. Bouchard, R. P. and G. Olivier, "Circuits et Machines Électriques," Ecole Polytechnique de Montréal, 1995, ISBN 2-553-00428-1.
12. Alger, P. L., The Nature of Induction Machines, 2nd Ed., Gordon and Breach Publishers, New-York, London, Paris, 1970.
13. Le Besnerais, J., V. Lanfranchi, M. Hecquet, and P. Brochet, "Prediction of audible magnetic noise radiated by adjustable-speed drive induction machines ," IEEE Transactions on Industry Applications, Vol. 46, No. 4, Jul.-Aug. 2010.