Abstract
Vibration analysis of converter-fed motor for electric powertrain is a much-needed technology for electric vehicle industry, which plays an important role in the noise, vibration, harshness (NVH) optimization design, fatigue monitor, fault diagnosis, and life prediction. The characteristics of the internal operating condition force (OCF) for the propulsion motor of electric vehicles under multiple operating conditions (MOC) were investigated by using the proposed vibro-inertance matrix theory (VIMT) in this paper. The complete analytical expansion of vibro-inertance matrix ofthe statorcomponentwas firstly derived, and a mathematical analytical testing model of OCF was established. The OCF of the 21kW prototype was measured under MOC, and the spectra of the mechanical and electromagnetic OCF of the prototype were fully secured via Brüel & Kjær 4520 3D acceleration sensors and Brüel & Kjær multi-purpose input modules. The vibration and fatigue sources under MOC were revealed through the source path contribution (SPC) analysis method. Finally, the proposed VIMT measurement and analysis method of OCF were verified by both finite element simulation and experimental verification.
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