This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Vibration Diagnosis on an Electric Motor: Use of Fiber Optic Sensors to Detect Rotor Eccentricity
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 15, 2016 by SAE International in United States
Annotation ability available
Event: 9th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
The recent use of electric motors for vehicle propulsion has stimulated the development of numerical methodologies to predict their noise and vibration behavior. These simulations generally use models based on an ideal electric motor.
But sometimes acceleration and noise measurements on electric motors show unexpected harmonics that can generate acoustic issues. These harmonics are mainly due to the deviation of the manufactured parts from the nominal dimensions of the ideal machine.
The rotor eccentricities are one of these deviations with an impact on acoustics of electric motors. Thus, the measurement of the rotor eccentricity becomes relevant to understand the phenomenon, quantify the deviation and then to use this data as an input in the numerical models.
An innovative measurement method of rotor eccentricities using fiber optic displacement sensors is proposed. These sensors have the characteristics to get round the difficulties of such a measurement: small size, adaptive shape and insensitivity to magnetic and electric perturbation.
The measurement of rotor eccentricities is performed on an automotive electric motor in operating conditions in a test bench. The associated preparation work and the precaution are also detailed. Then, the measured data including rotor orbits are analyzed. Finally, the links with the other data measured such as stator acceleration levels and stator deflection shapes are established.
CitationLecuru, S., Bouvet, P., Jouvray, J., and Wang, S., "Vibration Diagnosis on an Electric Motor: Use of Fiber Optic Sensors to Detect Rotor Eccentricity," SAE Technical Paper 2016-01-1836, 2016, https://doi.org/10.4271/2016-01-1836.
- Pellerey, P., Lanfranchi, V. and Friedrich, G. “Vibratory simulation tool for an electromagnetically excited non skewed electrical motor, case of the Wound Rotor Synchronous Machine”, ELECTRIMACS2011, Cergy-Pontoise, France, June 2011.
- Dupont, J., Aydoun, R., and Bouvet, P., "Simulation of the Noise Radiated by an Automotive Electric Motor: Influence of the Motor Defects," SAE Int. J. Alt. Power. 3(2):310-320, 2014, doi:10.4271/2014-01-2070.
- Dorrell David G. “Sources and Characteristics of Unbalanced Magnetic Pull in Three-Phase Cage Induction Motors With Axial-Varying Rotor Eccentricity”, IEEE transactions on industry applications, vol. 47, no. 1, January/February 2011
- Ngote, N., Guedira, S. and Cherkaoui, M. “A new approach to diagnose induction motor defects based on the combination of the TSA method and MCSA technique”, WSEAS transactions on signal processing, Issue 3, Volume 8, July 2012.
- Coenen, I., Piantsop Mbo'o, C. and Hameyer, K. “Statistical evaluation of manufacturing tolerances in electrical machines by simulation and measurement”, 4th International Conference on Power Engineering, Energy and Electrical Drives, Istanbul, Turkey, 13-17 May 2013.
- Rezig, A., Mekideche, M. and Djerdir A., “Effect of rotor eccentricity faults on noise generation in permanent magnet synchronous motors”, Progress In Electromagnetics Research C, Vol. 15, 117-132, 2010.
- Muszynska, A. “Vibrational Diagnostics of Rotating Machinery Malfunctions”, International Journal of Rotating Machinery 1995, Vol. 1, No. 3-4, pp. 237-266.
- Griscenko, M and Elmanis-Helmanis, R. “Eccentricity of slow-speed salient-pole generator: analysis based on air gap spectrum”, Latvian journal of physics and technical sciences 2015, 1, doi: 10.1515/lpts-2015-0003