Application of grain-oriented electrical sheets in flux switching machines

设计具有高转矩密度的高效电机是一项非常具有挑战性的任务。随着减少温室气体的既定目标的实现，减少能源消耗的其他一些目标也可以实现。因此，电机作为机电转换器，起着重要的作用。尽管电机电磁有源部件的几何形状朝着节能方向进行了优化，但应考虑新机器拓扑结构和材料的应用，这是本研究项目的主要任务。在一些早期数值模拟结果的基础上，晶粒取向电工钢板在一个新的机器概念中的应用，磁通切换永磁电机（FSPMM），分段定子结构将被调查。为了评估应用晶粒取向电工钢板的内在潜力，这些材料应在第一步的特点。为了表征材料，必须开发一种非常特殊的测试装置，该装置能够研究电磁特性以及切割边缘和接头边缘对钢板轧制方向的影响。根据所获得的结果，应根据切割和连接方法做出决定。接下来，将使用简单的磁等效电路（MEC）模型对机器的操作行为进行分析建模，因为这种方法的计算负担较低。尽管对电机的几何形状进行了建模，但切割方法和定子分割的影响将在MEC中进行建模和考虑。在使用MEC时获得电机运行行为的初步结果后，将通过应用有限元分析完成电机原型的最终设计。在项目的这一阶段，必须做出决定，在有源机器部件中使用晶粒取向电工钢板。此外，还应考虑材料切割方法的影响和定子结构各单段连接边缘处的微气隙的影响。最后，将所设计的样机组装并集成在一个测试装置中，对样机进行转矩、齿槽转矩、功率密度和效率等运行特性测试。为了评估在FSPMM中应用晶粒取向材料的优点，将与该研究所已经存在的具有非晶粒取向电工钢板的现有FSPMM进行比较。该项目的总体目标是证明所述FSPMM在使用晶粒取向电工钢板时的功率密度和效率的预期增加。

The design of efficient electrical machines with high torque density is a really challenging task. In accordance with the achievement of the given goals for the reduction of greenhouse gases some other goals to reduce the energy consumption could also be met. Therefore, the electrical machine, as an electro-mechanical transducer, plays an important role. Despite the optimization of the geometry of the electromagnetically active parts of the electrical machine towards energy-efficiency, the application of new machine topologies and materials should be considered, which is the main task of this research project. On the basis of some early stage numerical simulation results the application of grain-oriented electrical steel sheets in a new machine concept, the flux switching permanent magnet machine (FSPMM), with a segmented stator structure will be investigated.To evaluate the inherent potential of applying grain-oriented electrical steel sheets, these materials should be characterized in a first step. For the characterization of the material a very specific test set-up has to be developed, which is able to investigate the electromagnetic characteristics as well as the influences of the cutting edges and the joint edges depending on the rolling direction of the steel sheets. Based on the gained results, a decision in view of the cutting and joining method should be made.Next, the machine's operation behaviour will be modeled analytically with a simple magnetiac equivalent circuit (MEC) model, because of the resulting lower computational burden of this method. Despite the modelling of the machine's geometry, the influences of the cutting methods and the segmentation of the stator will be modeled and considered in the MEC.After achieving some preliminary results of the operation behaviour of the machine while using the MEC, the final design for the machine's prototype will be accomplished by applying the Finite-Element analysis. At this stage of the project a decision has to be made, where to use the grain-oriented electrical steel sheet within the active machine parts. Furthermore, the influence of the material cutting methods and the influence of the micro-airgaps at the joint edges of each single segment of the stator structure should be taken into account. Finally, the designed prototype machine will be built-up and integrated in a test-setup.The prototype will be tested according its operation characteristics like torque, cogging torque, power density and efficiency. To evaluate the advantages of applying the grain-oriented material in a FSPMM a comparison with an existing FSPMM with non-grain-oriented electrical steel sheets, which already exists at the institute, will be performed. The overall goal of this project it to prove the expected increase in power density and efficiency of the said FSPMM while using grain-oriented electrical steel sheets.