Analysis On Electromagnetic Exciting Force Of Asynchronous Motor

The vibration and noise of electrical machine is the important symbol for evaluating the machinery quality. The noise and vibration of electrical machines consist of three parts: electromagnetic noise and vibration, mechanical noise and vibration and aerodynamic noise and vibration. Along with the improvement of design and manufacture level,the modern electric machine design is facing the big electric current, high magnetic flux direction, the electromagnetic vibration and noise is the most important one. The electromagnetic vibration and noise caused by electromagnetic force which generated by the interaction of the air gap magnetic field when the machine is running. The research centered on the electromagnetic exciting force of the Y132M-4asynchronous machines under different conditions, and verified by experiments.Firstly, the electromagnetic radial force of asynchronous machine is analyzed based on traditional analysis method:the magnetic potential and the magnetic conductance law. The distribution of air gap magnetic-flux density and the radial force wave are analyzed with these methods either. The impact of static eccentric of rotor, core saturation and load are analyzed.Then, the electromagnetic force calculation methods based on magnetic field analysis by finite element method(FEM) are introduced. At the same time, the Maxwell stress tensor by using ANSYS software is also illuminated. And the results are processed by two-dimensional Fourier decomposition. The electromagnetic force of the Y132M-4asynchronous machine under different conditions, such as static eccentric of rotor, core saturation and load, are calculated.