Research Of Electromagnetic Vibration And Noise Of Squirrel-Cage Motor Based On The Finite Element

Squirrel cage induction motor is widely used in various fields, including in petroleum, chemical industry, machinery and equipment manufacturing, etc.. At the same time noise index of squirrel cage induction motor has become one aspect indicators to measure quality level of the motor, and the noise index is now more and more attention in the industrial production. So if effectively action can be taken, reducing the noise of the squirrel-cage motor, to improve the level of motor design and design quality, enhance the competitiveness of the enterprises, has become a major study subject both at home and abroad. In this paper, the main content is the vibration and noise analysis of squirrel cage induction motor, studying the electromagnetic force, modal and vibration and noise, and the concrete research content is divided into the following several aspects:First of all, because the squirrel cage induction motor have the axial symmetry distribution, in order to simplify the analysis and calculation, and this article is based on the two-dimensional transient magnetic field of Ansoft to calculate prototype, to get the motor radial magnetic flux density distribution curve. Then of the fundamental wave and harmonic distribution of the radial magnetic flux density are obtained by Fourier analysis, further the distribution of the radial electromagnetic force of motor is obtained by processing, and the correctness of the finite element analysis is proved by theoretical analysis which laid a foundation for the analysis of motor.Secondly, the Siemens NX which is 3D graphics software for equivalent modeling of motor stator core and base, then using modal module of Ansys workbench platform calculate the finite element modal for motor stator core of isotropic and anisotropic, and compare and analyze the isotropic and anisotropic effects on intrinsic mode of the stator core. Winding is effectively equivalent, to analyze the influence of the modal winding of the stator core. At last the stator and base integral finite element modal is analyzed, the stator natural frequency and vibration mode can be obtained through the analysis, which provide help for further study on the motor vibration and noise.Then, using the harmonic response analysis module of Ansys to apply the radial electromagnetic force load, and harmonic response analysis is carried out, to get the vibration displacement of the frequency response function curves and velocity and acceleration curve of the motor in the frequency domain scope. Finally using Siemens NX 3D graphics software to establish the spread of the noise of the motor, then we can calculate noise level by after processing plug Acoustic.Finally, choosing the different slot coordination from the conventional motor and optimization of motor slot size, to ensure that the structure size and volume weight remains the same, and to get the three-phase motor electromagnetic scheme optimization on the basis of the original motor, the improving optimization scheme of low electromagnetic noise squirrel cage induction motor is put forward on the basis of the original prototype, and complete the analysis and calculation of the correlation, noise sound pressure level of the new optimization solution is reduce at least 5 decibels under the condition of constant weight and size keep the same with the original conventional ordinary three-phase motor. At last the solution is formed for optimal prototype of the motor.