基于高功率密度特征的屏蔽式开关磁阻电机电热耦合分析与损耗优化

As the driving component in a hydraulic pumping system, a canned motor is featured by have a can shield in airgap as partition, where eddy current and considerable loss from cans stems. Such loss, from which power density and output performance are highly affected, has become a key enabling factor of efficiency enhancement. In this proposal, loss analysis and optimization approaches of a canned motor will be researched. Based on the previous work of a canned switched reluctance machine (SRM) and further electromagnetic coupled analysis, loss reduction methods and efficiency improvements will be made by illustrating the relation between airgap flux and temperature rise. Specifically the followings are included: 1) The mechanism of loss of a canned motor will be researched by investigating the coupling effect between loss and temperature rise on the can, as well as the change of characteristics by using the can. 2) Research of the optimization design principle of a canned motor will be performed by loss variation due to change of machine geometry. 3) The loss minimization oriented control strategies will be studied. The proposed study will offer strong support on loss analysis, as well as design and control of canned motors, which may provide improved solution for pump drives.

屏蔽电机作为液泵系统的驱动部件，其特点是在定转子之间的气隙中安装金属屏蔽套。屏蔽套在电机运行时由于受到交变磁场的作用从而出现涡流，产生涡流损耗。这导致电机效率低下、功率密度难以提升，已成为影响电机性能的瓶颈问题。本项目拟研究屏蔽电机损耗分析及优化方法：在前期屏蔽式开关磁阻电机构建及电磁分析的工作基础上，降低涡流损耗、提升电机功率密度。具体包括：1）屏蔽电机损耗机理分析：研究损耗变化与屏蔽套温升之间的耦合关系，分析屏蔽套结构对电机输出性能的影响。2）屏蔽电机本体结构优化设计准则研究：通过计算电机主要几何尺寸变化时的损耗，优化电机结构。3）屏蔽电机绕组电流控制：探索以低损耗为目标的电流控制策略。研究结果将丰富屏蔽电机设计与控制的理论，为突破液泵系统的高效驱动提供更优的解决方案。

根据前期项目申请书的内容，项目研究了屏蔽电机损耗分析及优化方法：屏蔽式开关磁阻电机多物理场分析及结构优化，进而降低涡流损耗、提升功率密度。具体包括：1）损耗机理分析：即损耗与屏蔽套温升之间的耦合关系，分析屏蔽套结构对电机输出性能的影响；2）屏蔽电机本体结构优化设计：计算电机主要几何尺寸变化时的损耗，优化本体结构；3）屏蔽电机绕组电流控制：探索以低损耗为目标的电流控制策略。研究结果提出了屏蔽套这一核心部件的“四高特征”，优化了电机结构，提出了以控制电机去磁过程为目标的屏蔽套损耗优化控制方法。研究结果丰富了屏蔽电机设计与控制的理论，为液泵系统的高效驱动提供了更优的解决方案。在本项目的资助下完成相关成果，如下：第一作者发表SCI论文7篇，其中IEEE Trans. Industrial Electronics论文2篇；IEEE Trans. Energy Conversion论文1篇；第一作者在德国斯普林格出版社出版专著1部，通讯作者发表SCI论文3篇，培养研究生3名（在读）。