EV HEV NVH testing solutions

EOMYS provides complete consulting services specialized to solve EV/HEV NVH issues, combining experimental tests and numerical simulations to characterize noise and vibrations due magnetic forces.

EV HEV NVH testing

Based on its expertise of noise and vibrations due to electromagnetic forces, EOMYS provides testing services to troubleshoot EV HEV NVH issues occuring in electric powertrains. These special tests include run-ups and spectrograms, Order Tracking Analysis, Operational Deflection Shape analysis, Experimental Modal Analysis and Sound Quality analysis. Additional tests to quantify geometrical, electrical and magnetic asymmetries may include

  • phase current / resistance / inductance measurements (current unbalance)
  • stator bore radius measurements (non uniform airgap)
  • rotor balancing, static & dynamic eccentricity levels (direct mechanical measurement or indirect electrical measurements)
  • IPMSM rotor magnetization along axial and circumferential directions (non uniform magnetization)

EOMYS combination of electrical engineering and vibro-acoustic skills allows to find the root cause of EV HEV NVH issues.

EV HEV NVH post processing under NVGate

For electric vehicle automotive applications, EOMYS developed special testing methods and post-processing to quickly identify the root cause of e-NVH issues. Some of these high-end applications, such as spatiograms and markers for magnetic force wavenumbers, have been implemented in EV/HV NVH module developed by EOMYS and OROS. This way, EOMYS can troubleshoot more efficiently EV HEV NVH issues, especially when combining testing with MANATEE software simulations.

Spatiograms allow to more quickly identify the root cause of noise and vibrations by identifying magnetic force wavenumbers involved in EV HEV NVH:

Example of spatiogram obtained with OROS EV/HV module
Example of spatiogram obtained with OROS EV/HV module

Electric markers allow to identify the theoretical magnetic force wavenumber which is behind a specific excitation frequency / order:

Electric markers obtained with OROS EV/HV module
Electric markers obtained with OROS EV/HV module

EV HEV NVH post processing under MANATEE

MANATEE software dedicated e-NVH post processing can also be used by importing experimental data obtained during EV HEV NVH tests. Based on the slot/pole combination and electrical machine topology, sound pressure and acceleration levels can be processed to perform Order Tracking analysis per wavenumber, spectrograms and spatiograms under MANATEE environment.

Noise reduction of electric motors using Order Tracking Analysis in MANATEE software
Noise reduction of electric motors using Order Tracking Analysis in MANATEE software

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