Abstract
Vibration and noise need to be calculated with a high degree of accuracy to estimate the radiated noise and vibration induced by the electromagnetic force from a motor. With a motor that has a three-dimensional electromagnetic field, the amplitudes and phases of electromagnetic force harmonics change with the axial position of the motor. We developed a way to analyze frequency responses of electromagnetically induced vibration using the electromagnetic force harmonics in representative plural axial cross-sections. We measured and calculated a sample motor's vibration induced by the 12th time order electromagnetic force harmonics, which has a dominant effect on the overall vibration, and we compared the vibration velocity levels. We calculated both the rotation speeds and vibration velocity levels with a high degree of accuracy at two observable peaks.
