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CADFEM ANSYS Extension for the calculation of Electric Motor Noise

From the vibration excitation to the structure-borne sound level

With the increasing presence of electric drives, they are also critically scrutinized for their noise development. This is where the CADFEM engineering tool Electric Drive Acoustics inside ANSYS comes in. It was specially developed for the simulation of electric motor noise and calculates the structure-borne noise level from the surface vibration of the housing, which is caused by the internal magnetic excitations.

Tools for the typical analysis steps

Electric Drive Acoustics inside ANSYS provides additional features for dynamic analysis in ANSYS Mechanical. As suggestions, the oscillating air gap forces are imported at the stator teeth, which originate from a transient electromagnetic FEM calculation of the machine. For their transfer from the time to the frequency domain, a Fourier transformation is carried out internally automatically.

The import of the time-dependent excitation data offers various options and thus also takes into account different procedures for the creation of the data. Dedicated functions also take over the distribution of the imported excitation loads on the teeth and reduce the manual work to a minimum. The vibration calculation is performed with a harmonic analysis with modal superposition. It allows the sweep over a speed range in which the excitations can also vary depending on the operating point. The structure-borne sound is then determined in terms of time and memory directly from the modal amplitudes. The representation for the speed range takes place in the popular waterfall or Campbell diagram in the acoustics.


The advantages at a Glance

  • Continuous workflow
  • Dynamic air gap forces from precise FEM simulations
  • Partially automated transfer of the air gap forces to the mechanical FEM model for common motor geometries
  • Efficient FEM vibration analysis over speed ranges with numerous speed-frequency points
  • Calculation of the structure-borne sound level (ERP - Equivalent Radiated Power) according to the basic machine-acoustical equation
  • Evaluation in the waterfall diagram
  • Identification of acoustically active orders, eigenmodes and areas of the housing surface
Your start in the world of simulation

Your start in the world of simulation

  • Introduce simulation safely
  • 4 steps to be operational
  • Accompaniment throughout the process


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