
9-1
9.1 Introduction
e problem of noise and vibrations is important for electrical machines. Indeed, standards in terms
of noise are more and more restrictive. e tendency to increase the power of machines for a given size
leads to increase in noise and vibrations. at is why the knowledge of phenomena generating acous-
tic noise is necessary not only to design modern electrical machines, but also to analyze systems with
acoustic and vibration problems.
is chapter focuses on noise of AC electrical rotating machines connected to the grid or operating
with adjustable-speed drives, with special emphasis on noise of magnetic origin. e objective ...