Noise, Vibration & Harshness – NVH for Electric Motors
FEA & CFD Based Simulation Design Analysis Virtual prototyping MultiObjective Optimization
FEA based Simulation Design for Electromagnetic multiphysics environments has a significant benefits for noise, vibration and harshness (NVH) analysis of electrical machines and transformers. NVH is an important analysis required by manufacturers of motors used in hybrid/electric vehicles, appliances, commercial transformers and other applications where quiet operation is an essential design parameter. Two-way transient magnetostriction coupling enables the magnetostrictive forces to be added to the magnetic forces and coupled to a mechanical design to predict acoustic noise.
Results from Electromagnetics solver obtained from the transient electromagnetic simulation to calculate the forces which are directly mapped to Mechanical solvers through special co-simulation algorithms for harmonic analysis. Optionally, an acoustic analysis can be performed to study noise.
The forces from Electromagnetics solver are mapped as force vectors within the volume of the individual mesh elements, allowing a detailed and accurate form of mapping. This is because element-based mapping allows forces to be calculated for individual mesh elements, increasing the accuracy.
To optimize for NVH, our engineers use the forces from the EM analysis to perform advanced vibro-acoustic simulations. The forces are mapped to evaluate the structural dynamics response of the motor.
Modal and harmonic stress coupling responses are important for simulating the NVH of an electric motor and for proper vibro-acoustic design of electric vehicles (EVs). The harmonic analyses generate absolute magnitudes of vibrations and waterfall diagrams to get a complete picture of the motor’s acoustic profile.
