Analysis of the NVH-Behavior of Permanent Magnet Synchronous Machines with Consideration of Manufacturing Tolerances

  research results of the NVH-Behavior Copyright: IEM

The manufacturing related deviations, that occur during the production process of electrical machines, can have an influence on the machine’s electromagnetic excited acoustic behavior. For the ability to evaluate these influences in an early design state, a fast analytic magnetic circuit model, based on the method of conformal mapping, has been designed. Among others, static and dynamic eccentricities, tooth and magnetization errors or winding errors can be mapped within this model. The model allows a qualitative examination of the occurring field harmonics, the therefore resulting force density waves and the arising noise radiation, as well as an assessment of the expected amplitudes. The relative comparison of single field harmonic components from different design variants allows the assessment of the influence of geometric variations.