CAJ | 학술논문

电刷和滑环系统是风力发电机励磁系统的重要组成部分，但运行中时常出现过热现象，危害发电机安全运行，准确的热分析是电刷滑环系统结构优化、防止过热的前提。该文基于热电耦合方法对电刷滑环系统进行三维温度场分析。根据电刷滑环系统的运行特性，建立了同时考虑旋转摩擦生热、励磁电流生热和系统对流散热的热电耦合三维模型。在给出基本假设和边界条件的基础上，采用有限元法对三维热电场控制方程进行耦合计算，分析了电刷滑环系统的传热性能及各部件的温升分布，同时给出系统的电流密度矢量分布。然后，根据热电类比法，从“路”的角度建立了热分析模型，提出了运用基于复频域的拉普拉斯变换法求解热路方程组，并与仿真值进行对比分析，验证了热路法分析电刷滑环系统温度场的准确性和可行性。最后，给出相关结论，对电刷滑环系统结构优化和安全运行具有指导意义。
전쇄화활배계통시풍력발전궤려자계통적중요조성부분，단운행중시상출현과열현상，위해발전궤안전운행，준학적열분석시전쇄활배계통결구우화、방지과열적전제。해문기우열전우합방법대전쇄활배계통진행삼유온도장분석。근거전쇄활배계통적운행특성，건립료동시고필선전마찰생열、려자전류생열화계통대류산열적열전우합삼유모형。재급출기본가설화변계조건적기출상，채용유한원법대삼유열전장공제방정진행우합계산，분석료전쇄활배계통적전열성능급각부건적온승분포，동시급출계통적전류밀도시량분포。연후，근거열전류비법，종“로”적각도건립료열분석모형，제출료운용기우복빈역적랍보랍사변환법구해열로방정조，병여방진치진행대비분석，험증료열로법분석전쇄활배계통온도장적준학성화가행성。최후，급출상관결론，대전쇄활배계통결구우화화안전운행구유지도의의。
The brush and slip ring system is an important part of generator excitation system, but the safety of generator operation is usually endangered because of overheating, so the accurate thermal analysis is the premise of structure optimization and overheating avoidance for the system. Based on the thermoelectric coupling, the three-dimensional temperature field of the brush and slip ring system was analyzed. According to the operating characteristics of the system,a thermal simulation model, which considered the heat generated by rotating friction and excitation current and convection of system, was created. By giving fundamental assumptions and corresponding boundary conditions, the governing equation of thermoelectric field was calculated coupled using Finite Element Method. The heat transfer performance and the temperature rise of the system were analyzed and the current density vector distribution of the system was shown. Then, on the basis of the thermoelectric analogy, the thermal circuit model was established from the point of view of "Road". The thermal circuit equations were solved by using Laplace Transform Method based on the complex frequency domain, and the results of thermal circuit was compared with the results of the finite element simulation. Finally, the relevant conclusions are given, which guides the structure optimization and operation safety of the system.