电励磁双凸极发电机偏心特性研究

针对电励磁双凸极发电机静态偏心故障，首先对于发电机的气隙长度进行了等效解析建模，并对静偏心程度与磁链、电磁转矩以及气隙磁密等重要特性的关系进行了理论推导。然后，通过Ansys有限元建立12/8三相电励磁双凸极发电机的2D有限元模型，并对电磁信号理论分析结果进行验证。最后，利用Workbench中耦合电磁、模态与谐响应分析模块对发电机的径向振动信号进行有限元仿真。研究结果表明，仿真结果与理论分析结果基本吻合，证明静偏心故障中偏心率对于电励磁双凸极发电机性能具有一定的影响，为后续其静偏心故障诊断提供理论基础。

Eccentricity Characteristics of Doubly Salient Electromagnetic Generator

For the static eccentricity fault of the doubly salient electromagnetic generator, firstly, the equivalent analytical model of the air gap length of the generator is carried out. The theoretically relationships between the degree of static eccentricity and important characteristics such as magnetic flux linkage, electromagnetic torque, and air-gap magnetic density are derived. And then, a 2D finite element model of a 12/8 three-phase electrically excited salient-pole synchronous generator is established using Ansys finite element analysis, and the theoretical analysis results of electromagnetic signals are verified. Finally, the radial vibration signals of the generator are simulated through the coupled electromagnetic, modal, and harmonic response analysis modules in Workbench. The research findings show that the simulation results are basically consistent with the theoretical analysis, confirming that the eccentricity ratio in static eccentricity faults has a certain impact on the performance of the electrically excited salient-pole synchronous generator, thus providing a theoretical foundation for subsequent diagnoses of its static eccentricity faults.