Electric Motor Noise: Permanent Magnet Synchronous Motor

Application ID: 90081

This model analyses the noise generated by an electric motor during its operation at different speeds of rotation. The type of electric motor analyzed, a permanent magnet synchronous motor (PMSM) uses permanent magnets in the rotor and a variable frequency current traveling through the stator to generate torque. The electromagnetic forces generated during its operation generate vibrations not only at the frequency of excitation but also at higher frequencies or harmonics. A transient analysis is used to determine the electromagnetic forces in the time domain. A Fourier transform is used to determine the contributions in the frequency domain. The vibroacoustic response of the PMSM casing and its acoustic radiation is computed. A Campbell plot is generated showing the main harmonics contributing to the acoustic response of the PMSM at various speeds of rotation.

This model example illustrates applications of this type that would nominally be built using the following products: