无刷双馈电机气隙中的电磁力分析仿真

Analysis and Simulation of Electromagnetic Force in Air Gap of Brushless Doubly-fed Machine

对无刷双馈电机应用有限元软件进行电磁场分析,基于该模型计算气隙磁通密度。由于无刷双馈电机有两套绕组的复杂性,根据两者之间的关系,用近似的办法求出气隙磁密的平均值,分别求出径向磁密和切向磁密,再运用解析法求出电磁力。分析了气隙磁密和电磁力分别随着时间和空间变化,并研究气隙中的电磁力和磁密的关系,再结合二维傅里叶分析的方法对电磁力做谐波分析和频率分析,分析了电磁力随着转差率的变化,以及电磁力不同阶数不同频率的成分。通过比较表明电磁力的计算方法是合理的,为以后研究无刷双馈电机的振动和噪声奠定了基础。

The BDFM use finite element software of electromagnetic field analysis calculate the air gap flux density, due to the complexity of the two sets of windings , based on the model to is matchless doubly fed motor, according to the relationship between the two, with approximate measures for air gap magnetic density average value were obtained diameter to the magnetic density and cut to the magnetic density, then use ana- lytic method to calculate the electromagnetic force. Analysis of the air gap magnetic dense and electromag- netic force respectively with the change of time and space, relation and the air gap in the magnetic force and magnetic density, combined with two Fourier analysis method of harmonic analysis and frequency analysis of electromagnetic force, electromagnetic force with the variation of the slip, and electromagnetic force is differ- ent order number of different frequency components were analyzed, by comparison shows that the electromag- netic force calculation method is reasonable, for the calculation of the vibration and noise of the brushless doubly fed machine laid the foundation.