ABSTRACT
Section 9.2 presents the various origins of noise of electrical rotating machines. Typical spectra of noisy machines are depicted. žen, in Section 9.3, the phenomenon of noise of magnetic origin is described. že suggested analytical method makes it possible to understand what the contribution of the ¹ux density harmonics on the noisy forces is. In Section 9.4, an analytical mechanical and acoustic modeling for rotating machines is proposed. žese developments are important because the forces that produce the noise have various consequences, not only in function of their amplitude and frequency, but also in function of the mechanical structure response. že method allows laying emphasis on the
9.1 Introduction ...................................................................................... 9-1 9.2 Origins of Noise and Vibrations of Electrical Rotating
9.6 Conclusion ....................................................................................... 9-21 References .................................................................................................... 9-21
important parameters to supervise for an e¢cient acoustic design. Finally, Section 9.5 presents an analytical method to determine the ¹ux density harmonics of AC machines.
