Magnetic noise reduction of in-wheel permanent magnet synchronous motors for light-duty electric vehicles

This paper presents study of a multi-slice subdomain model (MS-SDM) for persistent low-frequency sound, in a wheel hub-mounted permanent magnet synchronous motor (WHM-PMSM) with a fractional-slot non-overlapping concentrated winding for a light-duty, fully electric vehicle applications. While this type of winding provides numerous potential benefits, it has also the largest magnetomotive force (MMF) distortion factor, which leads to the electro-vibro-acoustics production, unless additional machine design considerations are carried out. To minimize the magnetic noise level radiated by the PMSM, a skewing technique is targeted with consideration of the natural frequencies under a variable-speed-range analysis. To ensure the impact of the minimization technique used, magnetic force harmonics, along with acoustic sonograms, is computed by MS-SDM and verified by 3D finite element analysis. On the basis of the studied models, we derived and experimentally verified the optimized model with 5 dBA reduction in A-weighted sound power level by due to the choice of skew angle. In addition, we investigated whether or not the skewing slice number can be of importance on the vibro-acoustic objectives in the studied WHM-PMSM.Postprint (published version

Expedició per l'Amèrica del Sud del segle XVI : Les cròniques d'Índies

Els primers cronistes que van arribar a Amèrica van descriure que s'havien topat amb societats altament civilitzades i urbanitzades. Amb el pas del temps, aquests fets es van distorsionar i el món occidental va anar adquirint una visió diferent de la realitat. Per què? En la seva tesi doctoral, Isabel Bargalló Sánchez desenterra aquesta alteració i respon aquesta i altres preguntes.Los primeros cronistas que llegaron a América describieron que se habían topado con sociedades altamente civilizadas y urbanizadas. Con el paso del tiempo estos hechos se distorsionaron y el mundo occidental fue adquiriendo una visión diferente a la realidad. ¿Por qué? En su tesis doctoral Isabel Bargalló Sánchez desentierra esta alteración y responde a ésta y otras preguntas