Wide Speed Range Nvh Performance Optimization In Permanent Magnet Synchronous Machines For Automotive Application Using Vibration Synthesis

This research focuses on wide speed range noise, vibration and harshness (NVH) performance comparison and optimization of different fractional slot concentrated winding permanent magnet synchronous machines (PMSM) for automotive application through a unit force response-based method of vibration prediction called vibration synthesis. Process verification is done for vibration synthesis through extensive testing of a 12 slot 10 pole (12s10p) PMSM before subsequent application for comparison of different PMSM designs. Most of the NVH comparison work available in the literature focus on single operating speed-based performance evaluation which is the drawback this work aims to remove. Different slot/pole combinations of PMSMs are compared in this work in regard to their NVH performances. Electromagnetic and/or mechanical impacts brought by one structural NVH performance improvement method is analyzed in detail using unit force response method, and subsequently, vibration synthesis is used to compare the NVH performances over the entire speed range of interest. This will offer a better understanding of different design modifications done for NVH performance improvement in electric machines.