无刷双馈电机全域多工况温度场的分析与计算  

Temperature field analysis and calculation of brushless doubly-fed machines considering global region and different operating states

作　　者：韩力[1] 焦晓艳[1] 李景灿[1] 王华[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电机与控制学报》2013年第5期1-8,共8页Electric Machines and Control

基　　金：中央高校基本科研业务费科研专项自然科学类项目(CDJZR12150022)

摘　　要：为研究无刷双馈电机(BDFM)的温度分布规律,分析了定转子间的热耦合、定子铁心与机壳间安装间隙的处理方法,考虑了导热系数随温度的变化以及散热系数随风速的变化,进而提出了定转子全域温度场计算模型。用有限元法计算了BDFM二维稳态和暂态温度场,揭示了不同结构和运行工况下BDFM的温度分布规律。结果表明,最高温度出现在接线盒附近的定子控制绕组;在控制绕组电流频率一定的情况下,增加散热翅高度、提高散热翅风速、减小负载转矩、降低控制绕组电压,可降低温升;采用控制绕组恒压频比控制策略,BDFM在双馈亚同步运行时的温升高于在双馈超同步运行时的温升,而在单馈异步运行和双馈同步运行时,温升明显降低。相似结构感应电机的温度实测数据验证了计算模型的正确性。To research the temperature distribution of brushless doubly-fed machine （BDFM）, the methods of processing the heat coupling between stator vs. rotor and the installing air-gap between stator core vs. frame were analyzed. The changing of thermal conductivity with the temperature and the changing of transfer coefficient with the wind speed were considered. And then, the calculation model of BDFM temperature field considering the global region was proposed. 2D steady and transient temperature fields of the BDFM were calculated by finite element method, and the temperature distribution considering the different structures and operating states were obtained. The results show that the maximum temperature is located at the stator control winding near the junction box. When the current frequency of control winding keep constants, the temperature rise dropped by increasing the fins height and wind speed, reducing the load torque and the voltage of control winding. The temperature rise is higher at the sub-synchronous operating mode than that at the super-synchronous mode with the constant ratio of control winding voltage to frequency. The temperature rise is reduced significantly at the singly-feed asynchronous operating mode or at the doubly-fed synchronous operating mode. The correctness of the proposed model is verified by the temperature test of a similar induction machine.

关 键 词：无刷双馈电机 材料热属性 运行工况 温度场 有限元法 

分 类 号：TM344.4[电气工程—电机] TM154.1