【作者】 杨丽；

【导师】 刘闯；

【作者基本信息】 南京航空航天大学 ， 电机与电器， 2006， 硕士

【摘要】 开关磁阻电机(简称SR电机)具有双凸极结构,工作原理不同于传统的交流电机。SR电机铁心的磁通波形不仅与电机的相数有关,还与定、转子齿极数、定子绕组连接方式等密切相关,从而使得SR电机磁场分析很复杂,复杂的磁通密度波形导致电机损耗特别是铁损的计算非常困难。电机的损耗又会引起电机的温升,因此高性能的SR电机的热分析也成为目前的研究热点。然而目前国内外对SR电机的损耗和发热问题的研究还不很系统和完善,常见的铁损计算方法仍是基于传统经验公式;国内对SR电机的温升分析特别是暂态热分析开展的工作还很少。因此,本文以开关磁阻电机的损耗及热分析为研究对象,进行了一系列的理论研究和实验验证。本文首先对SR电机的磁场进行了有限元分析,得到了电机铁心各点的磁通密度波形及变化规律。在磁场计算所得数据的基础上,本文提出了采用双频法分离出SR电机铁损中的涡流损耗与磁滞损耗,并分别采用不同的方法计算出这两种损耗。本文的最后将损耗计算结果耦合到电机的三维热分析模型中,得到了电机的瞬态温升曲线,并重点讨论了对流换热系数对温度变化的影响。另外,本文还建立了双极型SR电机系统模型,采用了H桥式功率主电路,详细分析了其工作原理,并在磁场、损耗等方面与采用不对称半桥变换器的传统单极型SR电机系统进行了对比。更多还原

【Abstract】 Switched reluctance motor (SRM) has a double salient construction and its working principle is different from traditional AC electrical machines. Analysis for magnetic field of SRM is very complicated since the flux waveforms in different parts of the motor vary with motor phase, stator pole and rotor number, also with the winding connections, etc, which results in the SRM losses, especially iron loss calculation difficult.The temperature analysis due to the losses has become a study hot spot. However, research on iron loss and heat analysis for SRM is not in-depth.The conventional iron loss calculation is based on empirical formula and the work about temperature analysis especially transient heat analysis is not enough domestic. So this paper aims at academic research and practice of SRM losses and temperature rise.Firstly, SRM magnetic field analysis is performed to get the flux density waveforms in motor core. Based on the magnetic field data, this paper presents a double-frequency method to separate eddy current lossand hysteresis loss from iron loss, then different methods are used to calculate the two losses separately. Finally, after calculating iron loss and copper loss with the magnetic field analysis, use it as a heat source, and conduct a non-stationary analysis independently with the three dimensional thermal analysis which concentrates on the effect of the heat transfer coefficient on the temperature rise.In this paper, a bipolar switched reluctance machine system model is also established with an H bridge converter as its power circuit topology.更多还原