Application to e-NVH The slot/pole combination and e-motor topology (induction machine Vs synchronous machine, radial Vs axial flux, internal Vs external rotor) determine the characteristic spectra of slotting magnetic forces […]
Definition The switching frequency and switching strategy determine the characteristic voltage and current supply spectra of AC electrical machines. They are chosen to maximize the converter output power, minimize electric […]
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 called Laplace forces). Let us […]
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 magnetic forces applied to stator […]
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 of variable width: when smoothed […]
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 case of magnetic noise and […]
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 stator magnetomotive force space 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 flux, resulting in a modification […]
Noise and vibrations of electrical machines include electromagnetically-excited sources, aerodynamic sources and mechanical sources. This article briefly explains the origin of magnetic noise and vibrations in electric machines, also called […]
Definition A wavenumber describes the spatial frequency of a periodic quantity (permeance, magnetomotive force, flux density, magnetic force, magnetic vibration), generally along the airgap of the electrical machine or along […]