An eccentric position diagnosis method of static eccentricity (SE) fault of external rotor permanent magnet synchronous motor (ER-PMSM) is presented. Firstly, an analytical model of no-load radial magnetic field of ER-PMSM is established. Analytical models of no-load Back-EMF of both unit motors and the whole motor are carried out and are verified by finite element method (FEM) and experimental measurements. Then, the influences of SE ratio, SE circumferential angle, winding distribution mode and number of parallel branches on no-load radial magnetic field and no-load Back-EMF are analyzed based on these analytical models. The results show that SE does not affect the frequency characteristics of no-load radial magnetic field, but changes space order characteristics. On one hand, for ER-PMSM, of which the number of unit motors is equal to 1, SE causes no-load Back-EMF distortion. On the other hand, for ER-PMSM, of which the number of unit motors is greater than 1, SE does not affect no-load Back-EMF of the whole motor, but it still leads to no-load Back-EMF distortion of unit motors. Therefore, based on total harmonic distortion (THD) of no-load Back-EMF of unit motor, a projection method of intersection lines for SE fault diagnosis of ER-PMSM is proposed finally.

References

1. 1)
  - 23. Hassanzadeh, M., Faiz, J., Kiyoumarsi, A.: ‘A new analytical technique for analysis and detection of air-gap eccentricity fault in surface-mounted permanent-magnet machines’, Int. Trans. Electr. Energy, 2019, 29, (3), pp. 1–25.
2. 2)
  - 14. Rahideh, A., Korakianitis, T.: ‘Analytical magnetic field distribution of slotless brushless machines with inset permanent magnets’, IEEE Trans. Magn., 2011, 47, (6), pp. 1763–1774.
3. 3)
  - 19. Rahideh, A., Korakianitis, T.: ‘Analytical open-circuit magnetic field distribution of slotless brushless permanent-magnet machines with rotor eccentricity’, IEEE Trans. Magn., 2011, 47, (12), pp. 4791–4808.
4. 4)
  - 3. Yang, Y.B., Wang, X.H., Zhang, Z.S.: ‘Analytical calculation of magnetic field and electromagnetic performance of flux reversal machines’, IET Electr. Power Appl., 2014, 8, (5), pp. 178–188.
5. 5)
  - 6. Moayed-Jahromi, H., Rahideh, A., Mardaneh, M.: ‘2-D analytical model for external rotor brushless PM machines’, IEEE Trans. Energy Convers., 2016, 31, (3), pp. 1100–1109.
6. 6)
  - 10. Zhou, Y., Li, H.S., Meng, G.W., et al: ‘Analytical calculation of magnetic field and cogging torque in surface-mounted permanent magnet machines accounting for any eccentric rotor shape’, IEEE Trans. Ind. Electron., 2015, 62, (6), pp. 3438–3447.
7. 7)
  - 8. Liang, P.X., Chai, F., Li, Y., et al: ‘Analytical prediction of magnetic field distribution in spoke-type permanent-magnet synchronous machines accounting for bridge saturation and magnet shape’, IEEE Trans. Ind. Electron., 2017, 64, (5), pp. 3479–3488.
8. 8)
  - 9. Pourahmadi-Nakhli, M., Rahideh, A., Mardaneh, M.: ‘Analytical 2-D model of slotted brushless machines with cubic spoke-type permanent magnets’, IEEE Trans. Energy Convers., 2018, 33, (1), pp. 373–382.
9. 9)
  - 28. Ma, C.G., Li, Q.Y., Zheng, P., et al: ‘Effects of static eccentricity on the no-load back electromotive force of external rotor permanent magnet brushless DC motor used as in-wheel motor’, IET Electr. Power Appl., 2019, 13, (5), pp. 604–613.
10. 10)
  - 11. Zarko, D., Ban, D., Lipo, T.A.: ‘Analytical calculation of magnetic field distribution in the slotted air gap of a surface permanent-magnet motor using complex relative air-gap permeance’, IEEE Trans. Magn., 2006, 42, (7), pp. 1828–1837.
11. 11)
  - 26. Park, Y., Fernandez, D., Lee, S.B., et al: ‘Online detection of rotor eccentricity and demagnetization faults in PMSMs based on hall-effect field sensor measurements’, IEEE Trans. Ind. Appl., 2019, 55, (3), pp. 2499–2509.
12. 12)
  - 7. Hu, H.Z., Zhao, J., Liu, X.D., et al: ‘No-load magnetic field and cogging force calculation in linear permanent-magnet synchronous machines with semiclosed slots’, IEEE Trans. Ind. Electron., 2017, 64, (7), pp. 5564–5575.
13. 13)
  - 30. Saavedra, H., Urresty, J.C., Riba, J.R., et al: ‘Detection of interturn faults in PMSMs with different winding configurations’, Energy Convers. Manage., 2014, 79, (3), pp. 534–542.
14. 14)
  - 17. Kim, U., Lieu, D.K.: ‘Magnetic field calculation in permanent magnet motors with rotor eccentricity: with slotting effect considered’, IEEE Trans. Magn., 1998, 34, (4), pp. 2253–2266.
15. 15)
  - 1. Yang, Y., Rahman, M.M., Lambert, T., et al: ‘Development of an external rotor V-shape permanent magnet machine for E-bike application’, IEEE Trans. Energy Convers., 2018, 33, (4), pp. 1650–1658.
16. 16)
  - 27. Dorrell, D.G., Salah, A.: ‘Detection of rotor eccentricity in wound rotor induction machines using pole-specific search coils’, IEEE Trans. Magn., 2015, 51, (11), pp. 1–4.
17. 17)
  - 18. Jalali, P., Boroujeni, S.T., Bianchi, N.: ‘Simple and efficient model for slotless eccentric surface-mounted PM machines’, IET Electr. Power Appl., 2017, 11, (4), pp. 631–639.
18. 18)
  - 25. Kang, K., Song, J., Kang, C., et al: ‘Real-time detection of the dynamic eccentricity in permanent-magnet synchronous motors by monitoring speed and back EMF induced in an additional winding’, IEEE Trans. Ind. Electron., 2017, 64, (9), pp. 7191–7200.
19. 19)
  - 24. Bessous, N., Zouzou, S.E., Sbaa, S., et al: ‘New vision about the overlap frequencies in the MCSA-FFT technique to diagnose the eccentricity fault in the induction motors’. 5th Int. Conf. on Electrical Engineering – Boumerdes (ICEE-B), Boumerdes, Algeria, 2017.
20. 20)
  - 29. Ruschetti, C., Verucchi, C., Bossio, G., et al: ‘Rotor demagnetization effects on permanent magnet synchronous machines’, Energy Convers. Manage., 2013, 74, (10), pp. 1–8.
21. 21)
  - 20. Zhu, Z.Q., Wu, L.J., Mohd Jamil, M.L.: ‘Distortion of back-EMF and torque of PM brushless machines due to eccentricity’, IEEE Trans. Magn., 2013, 49, (8), pp. 4927–4936.
22. 22)
  - 13. Park, H., Woo, D., Jung, S., et al: ‘Modeling and analysis of magnet skew in axial flux permanent-magnet motor via field reconstruction method’. 19th Int. Conf. on Electrical Machines and Systems (ICEMS), Chiba, Japan, 2016.
23. 23)
  - 12. Ma, C.G., Chen, C.Y., Li, Q., et al: ‘Analytical calculation of no-load magnetic field of external rotor permanent magnet brushless direct current motor used as in-wheel motor of electric vehicle’, IEEE Trans. Magn., 2018, 54, (4), pp. 1–6.
24. 24)
  - 16. Kim, U., Lieu, D.K.: ‘Magnetic field calculation in permanent magnet motors with rotor eccentricity: without slotting effect’, IEEE Trans. Magn., 1998, 34, (4), pp. 2243–2252.
25. 25)
  - 15. Rahideh, A., Mardaneh, M., Korakianitis, T.: ‘Analytical 2-D calculations of torque, inductance, and back-EMF for brushless slotless machines with surface inset magnets’, IEEE Trans. Magn., 2013, 49, (8), pp. 4873–4884.
26. 26)
  - 22. Ebrahimi, B.M., Faiz, J., Roshtkhari, M.J.: ‘Static-, dynamic-, and mixed-eccentricity fault diagnoses in permanent-magnet synchronous motors’, IEEE Trans. Ind. Electron., 2009, 56, (11), pp. 4727–4739.
27. 27)
  - 2. Yang, Y.B., Chen, J., Yan, B., et al: ‘Analytical magnetic field prediction of flux switching machine with segmental rotor’, IET Electr. Power Appl., 2019, 13, (1), pp. 91–100.
28. 28)
  - 21. Zheng, M., Zhu, Z.Q., Cai, S., et al: ‘Influence of magnetic saturation and rotor eccentricity on back EMF of novel hybrid-excited stator slot opening permanent magnet machine’, IEEE Trans. Magn., 2018, 54, (11), pp. 1–5.
29. 29)
  - 5. Rahideh, A., Korakianitis, T.: ‘Analytical calculation of open-circuit magnetic field distribution of slotless brushless PM machines’, Int. J. Electr. Power Energy Syst., 2013, 44, (1), pp. 99–114.
30. 30)
  - 4. Zhu, Z.Q., Wu, L.J., Xia, Z.P.: ‘An accurate subdomain model for magnetic field computation in slotted surface-mounted permanent-magnet machines’, IEEE Trans. Magn., 2010, 46, (4), pp. 1100–1115.

Eccentric position diagnosis of static eccentricity fault of external rotor permanent magnet synchronous motor as an in-wheel motor

References

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