针对无刷交流励磁机铁心结构的复杂性和铁磁材料饱和特性的影响,采用非线性有限元法,利用有限元软件Maxwell,建立无刷交流励磁机的二维模型,对空载特性及额定励磁电流进行研究分析。以1台28 kW无刷交流励磁机为例,对电机气隙磁场仿真分析并求取空载特性。计算所得的基波电势与实测结果相符,为此类电机电磁场的设计提供理论依据。在此基础上通过场路耦合的方法,用外电路来模拟额定负载工况,计算出额定工况下的励磁电流。该方法具有实用性,可为一般的交流励磁机励磁电流计算提供参考。

In view of the complexity of the core structure of the brushless AC exciter and the influence of saturation characteristics of the ferromagnetic material, the finite element software Maxwell was used to create a twodimensional model of the brushless AC exciter for the research and analysis of noload characteristics and rated excitation current. Taking a 28 kW brushless AC exciter as an example, the simulation analysis of the air gap magnetic field of the motor and the calculation of the noload characteristics were carried out. The calculated fundamental wave potential was consistent with the measured results, and a theoretical basis for the design of the electromagnetic field of this type of motor was provided. Based on this, through fieldcircuit coupling method, the external circuit was used to simulate the rated load condition, and the excitation current under rated condition was calculated. This method had practicality and could provided reference for the calculation of the general AC exciter excitation current.

TM 34

上海发电机厂核心技术重点研究项目(T130717001.02)