Welcome to the “e-NVH Academy” of EOMYS!
In this section you will find online resources dealing with magnetic noise and vibrations in electric motors. e-NVH means “electromagnetically-excited Noise, Vibration and Harshness” or “electrical NVH” to refer to noise and vibration behaviour of electrified systems. A more general term for all applications is “electromagnetically-excited noise and vibrations”.
The aim of these online resources is to provide educational materials for both electrical engineers and NVH test engineers to learn:
the origin of electric motor whining noise and electromagnetically-excited vibrations (e-NVH) the electromagnetic and structural design parameters that are the most influential on electric motor noise and vibrations the noise and vibration reduction techniques which can be applied at design stage or after manufacturing of electrical machines
These resources are parts of EOMYS detailed technical training on magnetic noise and vibrations in electrical machines and passive components. They include:
articles and technical notes on NVH of electrical machines sound samples related to electromagnetic noise videos related to electrical machine noise & vibrations conference materials on e-NVH webinars on vibro-acoustics of electrical machines
To keep up with new e-NVH materials you can subscribe to our monthly newsletter.
The Jaguar i-Pace example is provided with Manatee free trial license. It illustrates a trend often observed nowadays in automotive electric powertrains: higher contribution of circumferential, pulsating r=0 forces applied to stator
Electromagnetic force wavenumber and mechanical structure mode order are sometimes confused when applying eNVH theory to predict noise and vibration due to magnetic forces in electric motors. Discover the difference
Simulation of magnetic noise and vibrations introduces several numerical challenges that are difficult to answer using general-purpose FEA software. Multiphysic coupling, speed and time discretization and numerical noise challenges are
Manatee software is the only solution to assess e-NVH metrics all along the development lifecycle of electrical systems. It helps to avoid common misconceptions met when designing electric drives. Discover for
Explore the differences between Induction machines and Permanent Magnet synchronous machines in terms of electromagnetic noise & vibrations. From the difference of frequency signature to the saturation and load effects
Discover the 4 noise reduction techniques most used by our control engineers (current angle modification, switching frequency shift, change of switching strategy and harmonic current injection). They are all based
Discover the 6 electric motor noise reduction techniques most used by our electrical engineers (change of magnet layout, coil pitching, modification of the rotor slot number, modification of the slot
Discover the 4 electric motor noise reduction techniques most used by our mechanical engineers (Mechanical structure natural frequency shift, change of boundary conditions, damping increase, and control of mechanical tolerances).
We are indexing numerous terms here from the field of mechanics and vibroacoustics, in English, French, and German. The content is not exhaustive and will be constantly updated, we appreciate
We summarize here numerous technical terms from the field of electromagnetics and electrical machines, in English, French, and German. The list is constantly being enriched, and we welcome any suggestions