Browse Publications Technical Papers 2018-01-1556

NVH Aspect of Electric drives- Integration of Electric Machine, Gearbox and Inverter 2018-01-1556

The rate in the electrification of vehicles has risen since last years and. Despite that, electric vehicles are quiet, NVH stays as a major aspect in vehicle development. The typical NVH issues are electric or gear whine from E-machine and Gearbox. Inverter also as a part of the system can contribute to noise, directly or by affecting E-machine. Simulation methodologies and CAE workflows are also developing to contribute to electric drives development. Front loading in the concept and layout design phase are necessary to avoid big NVH issues at the end of development. The authors previously presented a workflow for combining the electric and mechanical noise for electric drives for this front loading. Current paper shows the application of presented workflow for NVH simulation and validation for an Interior Permanent Magnet (IPM) Machine. There are two main other aspects relevant for NVH in electric drives, the gearbox and inverter. The inverter has two effects on NVH: it radiates noise itself, often not a significant source, but also creates an excitation supplied to the electric machine as current. The effect of these inverter harmonics the on the E-machine are shown. The simulation of this current from an inverter is presented and compared with measurements. The gearbox simulation workflow is briefly discussed and a guideline for selecting the gear ratios depending on the number of slots and poles is discussed. Lastly, aspects of integration of subsystems in a full electric drive unit also discussed.


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