Abstract
To give an answer to the growing expectation of eco-friendly transport and more particularly of electric powered vehicles, a thorough investigation of electric powertrain systems is needed. The integration of electric powertrains in vehicles creates several new challenges. One concerns the Noise, Vibration and Harshness (NVH) behaviour which is very different from conventional vehicles with Internal Combustion Engine (ICE). Opposed to the low-frequency noise signature of an ICE, the sound of an electric driveline features multiple pure and modulated high-frequency tones which, despite their low level, are perceived as unpleasant. The type of the electric motor, the power electronics, the control strategy and the vehicle integration aspects all have an impact on the noise signature and hence need to be investigated. This paper provides a comprehensive analysis of electric powertrains in the electric and vibro-acoustic domain based on experiments on different motor types and configurations.
KEYWORDS – NVH, Electric Drivelines, Signature Analysis, Permanent Magnet Synchronous Machine (PMSM), Switched Reluctance Machine (SRM)