【作者】 靳廷船；

【导师】 李伟力；

【作者基本信息】 哈尔滨理工大学 ， 电机与电器， 2006， 硕士

【摘要】 普通异步电机是工农业生产中重要的动力源,在运行过程中常常不能达到额定功率和负载的最佳结合,造成一定的能源浪费。根据这种存在的问题,本文提出了多功率异步电机设计思想,可根据负载的变化选择合适的功率等级,节约了能源。本文首先给出了多功率异步电动机的实现方案,通过改变定子绕组的接法来完成不同功率之间的变换,以适应不同负载的要求;根据电磁场理论,建立了多功率异步电动机二维电磁场数学模型,利用有限元方法求解了不同功率的起动特性和稳态运行特性,并与实验的结果进行了对比;利用时步有限元理论,建立了求解域内的场路耦合时步有限元方程,仿真分析了多功率异步电动机在不同额定功率下的满载起动特性;另外,本文从传热学理论出发,推导了二维稳态温度场的混合边值问题,求取了定子绕组的等效导热系数和气隙、机壳上的对流换热系数,建立了定子齿槽的温度场求解域模型,并在计算了相关热性能参数和电磁场分析的基础上得出了求解域内的温度分布,实现了电磁场和温度场的单向耦合,得出一些有益的结论;最后以一台小型异步电动机为例,计算分析了不同负载下定子的温度分布,并分析比较了定子铁心内圆气隙温度和机壳散热翅高度变化对电机定子温度分布的影响。论文做了一些实验工作,对理论计算的结果起到验证作用。更多还原

【Abstract】 The induction motor is the important power supply of industry and agriculture, but some time the rated power could not match with load, so the energy waste was making. Based on the existing problem the idea of designing multi-power induction motor was performed. The multi-power induction motor can change its output power according to the loading variation, and it can do some help for energy saving.The realized programme was proposed firstly in this paper, and the different output powers can be changed through altering the connection of stator windings in order to adapt to the different requests of loadings. According to the theory of electromagnetic field the 2-D mathematical model of multi-power induction motor was established. Then the starting parameters and running parameters, such as starting torque and starting current and efficiency and so on, were calculated using finite element method (FEM), the calculation results then compared with experimental results. According to the theory of time-step finite element method, the equations of time-step FEM coupling field and circuit in the solution region were established, and the starting performances at different rated loadings of multi-power induction motor were simulated and analyzed. In addition, based on the theory of heat transfer, the two-dimensional steady thermal field model is developed and the corresponding functional equation and equations of variation are derived. Then the stator windings heat conductivity and the coefficient of heat transfer of air gap and frame were calculated. The stator thermal field solving region of whole-slot and tooth is established. Based on the correlated thermal parameters calculated and analysis of electromagnetic field, the temperature distribution of the solving region is obtained, and the unindirectional coupler of electromagnetic field and temperature field was implemented. Finally, taking a small asynchronous motor for example, the stator更多还原