| Abstract |
The paper systematically reports theoretical and experimental investigations of the effect of load
conditions on the acoustic noise radiated by PWM controlled induction machines. The current and
noise spectra, as well as the sound pressure level, are measured and analysed as both switching
frequency and load are varied. The origins of the noise sources on load were identified, particularly
those due to the interaction of permeance field harmonics and mmf field harmonics associated with
current harmonics, and the measured noise frequencies are compared with theoretical predictions. |
