The dynamic characteristic of induction machine for mechanical equipment is a non-ignorable design requirement.In order to suppress the dynamic electromagnetic vibration and noise level of the motor,the dynamic characteristics of electromag-netic force and the corresponding weakening measures are studied.Firstly,the sources of harmonic magnetic potential and har-monic permeability in the magnetic field are determined by using the classical air-gap harmonic magnetic field theory.The ra-dial electromagnetic force of the motor is calculated by using the tensor method,and the features of the amplitude,pole pair and frequency of the main harmonic components are compared.Then,using finite element simulation and Fourier decomposition method,the basic characteristics of space-time traveling wave of electromagnetic force are determined,and the source of har-monic magnetic field of the main force wave is deduced.The results show that the change of the absolute amplitude of harmonic radial force can hardly affect the relative ratio of harmonic radial force to fundamental wave.Finally,an ideal model of the mag-netic slot wedge is established for the comparison and simulation.The weakening degree of the harmonic electromagnetic force is positively correlated with the permeability of the slot wedge.The superiority of the magnetic slot wedge is indirectly verified by the vibration test of the prototype.The proposed conclusion provides a theoretical basis for the study of the dynamic characteristics and the optimization design of the motor.
关键词
动态特性/谐波磁场理论/电磁激振力/有限元仿真
Key words
Dynamic Characteristic/Harmonic Magnetic Field Theory/Electromagnetic Excitation Force/Finite Element Simulation
维普
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