Title :
Large-band reduction of magnetic vibrations of induction machines with “breaking-of-impedance” interface
Author :
Durantay, Lionel ; Laurent, Fabrice ; Messin, Yannick ; Kromer, Valérie
Author_Institution :
Dept. of Res. & Dev., ALSTOM-Moteurs, Nancy, France
Abstract :
Magnetic vibration of induction machines is reduced, on a large-frequency band, with a breaking-of-impedance interface between stator core and frame. This device is designed with strong tangential stiffness and low radial stiffness. Two-dimensional finite-element (FE) dynamic response is proposed. It is based firstly on experimental determination of magnetic forces with search coils on a half polar pitch on the stator bore. Secondly, all characteristics of windings are determined versus temperature and frequency and homogenized with a linear mixing law. Thirdly, a FE modal analysis is optimized on the target function based on experimental natural frequencies, in order to identify the equivalent mechanical parameters of wound slots
Keywords :
asynchronous machines; damping; dynamic response; finite element analysis; machine testing; machine theory; magnetic forces; stators; vibrations; 2-D finite-element dynamic response; breaking-of-impedance interface; equivalent mechanical parameters; half polar pitch; induction machines; magnetic forces; magnetic vibrations large-band reduction; modal analysis; natural frequencies; radial stiffness; search coils; stator bore; stator core; tangential stiffness; target function; winding characteristics; wound slots; Boring; Coils; Finite element methods; Frequency; Induction machines; Iron; Magnetic forces; Stator cores; Temperature; Vibrations;
Journal_Title :
Industry Applications, IEEE Transactions on
