104 FINITE ELEMENT METHOD FOR NATURAL FREQUENCY ANALYSIS OF STATOR CORE IN INDUCTION MOTOR (K-MODEL)(O.S.2 Vibration and Noise Reduction Technology I)

概要

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Silent running is an essential environmental requirement for electric motors. Motors generate vibration as well as noise while running. Acoustic noise is composed of three components: electromagnetic noise, airborne noise and mechanical noise. Noise is a nuisance and must be reduced. The major factors responsible for electromagnetic noise are the increase in flux density resulting from the compact design of induction motors and the decrease in structural rigidity resulting from lightweight construction. Electromagnetic noise is generated when the electromagnetic force frequency coincides or approximates the natural frequency of the stator core. To reduce electromagnetic noise, it is therefore essential that the motor design exclude resonance phenomena. It is important to know the frequency of the electromagnetic force as well as the natural frequency. In this paper, the natural frequency of small induction motors has been analyzed using the mechanical finite element method. The motor used for analysis was the K model by IEE, Japan Meshing of the FEM model, length-wise rigidity of stator steel sheets, and motor noise were analyzed. The natural frequency of K model of IEE, Japan was accurately determined by mechanical FEM.
一般社団法人日本機械学会の論文
2005-05-31