Technical posts on magnetic noise and vibrations

Welcome to EOMYS e-NVH University ! You will find here a wide number of technical notes on magnetic noise and vibrations of electrical machines based on EOMYS Engineering consulting, testing, simulation and research experience. Interested to know more ? Check our training website for e-NVH courses.

Does Maxwell Tensor include Lorentz Forces ?

Electromagnetic problem An analytical case is presented in order to show that the airgap Maxwell Tensor method is taking into account the Lorentz forces (sometimes

January 21, 2019

What is tooth modulation effect?

Definition Mechanical slot modulation effect, also called tooth sampling effect, refers to the fact that airgap magnetic stress waves are “sampled” when converted to physical

November 15, 2018

What is a mode shape and a natural frequency?

Definition The dynamic deflection shape of linear structures can be decomposed in a sum of elementary vibration patterns. These vibration patterns are called mode shapes, they

June 8, 2018

What is an order tracking analysis?

Definition An order tracking analysis consists in post processing vibroacoustic calculations or measurements to extract the acoustic noise or vibration levels of some excitation frequencies

June 2, 2018

What is PWM (Pulse-Width Modulation)?

Definition PWM (Pulse-Width Modulation) is a technique initially developed to control electrical machines at variable speed. It is based on the generation of voltage pulses

January 26, 2018

What is switching noise?

Introduction Switching noise in electric drives comes from the electric machine excitation by electromagnetic forces induced by switching in power electronics. It is a particular

November 14, 2017

What are stator winding force harmonics?

Definition In e-NVH, stator winding force harmonics (sometimes called stator mmf force harmonics, or armature field force harmonics) refer to Maxwell force harmonics linked to

November 8, 2017

What are saturation force harmonics?

Definition In e-NVH, saturation force harmonics refer for Maxwell force harmonics linked to magnetic saturation combined with slotting effects. Saturation tends to flatten the airgap

November 7, 2017

What is damping?

Definition In structural dynamics, damping is a general term to name all physical phenomena dissipating vibrational energy. Viscous damping describes the energy loss arising from

October 10, 2017

What is an electrical order (or mechanical order)?

Definition An electrical order is the ratio between a frequency with the fundamental electrical frequency : begin{equation*} k_{e} = f / f_{e} end{equation*} Similarly, the

October 3, 2017

Technical posts on magnetic noise and vibrations

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