An Overview of Noise-Vibration-Harshness Analysis for Induction Machines and Permanent Magnet Synchronous Machines

Noise-vibration-harshness (NVH) analysis is becoming increasingly important to comprehensively understand, identify, and mitigate the vibration and noise of the electric machines. NVH analysis can also be used for the diagnosis of design defects and mechanical problems. This paper presents a comprehensive overview of modeling and analysis of NVH for induction machines (IMs) and permanent magnet synchronous machines (PMSMs) available in existing literature. The major components involved in NVH analysis are the electromagnetic force calculation, modal analysis, and multiphysics model based NVH synthesis, which will be thoroughly reviewed. Electromagnetic force calculation is vital to the overall analysis since the corresponding forces are the main source resulting in vibration and acoustic noise. Then, approaches for the modal analysis are reviewed to obtain the inherent characteristic of the machine structure and are used for solving the vibration problems. Subsequently, a multiphysics model based NVH analysis is established to evaluate the vibration and noise of electric motors. The synthesis integrates the electromagnetic, structural and acoustic radiation models.