High-performance synchronous reluctance motors by local manipulation of the magnetic properties of electrical steel laminations during the laser cutting process

通过在激光切割过程中局部控制电工钢叠片的磁性来实现高性能同步磁阻电机

• 批准号: 245194688
• 负责人: Professor Dr.-Ing. Eckhard Beyer
• 金额: --
• 依托单位: Professur für Elektrische Maschinen und Antriebe
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/245194688?language=en
• 关键词: performance; synchronous; reluctance; motors; local

The synchronous reluctance machine is considered as a viable alternative to typically used permanent magnet synchronous machines and induction machines. Especially the tremendous rising of rare-earth magnet prices (e.g. NdFeB) and the resulting higher costs of PM-machines led to an increased interest in this magnet-free and therefore cost-efficient motor type. However, a broader application of synchronous reluctance motors is currently still prevented by the comparatively low power factors and power densities. The highly limited saliency ratio (or synchronous inductance ratio) between the d-axis and q-axis flux can be considered as the main reason. Theoretical analyses have shown that higher saliency ratios can be achieved by reducing the width of the leakage flux guiding steel bridges. However, that leads to a decreased mechanical stability of the rotor. The planned project analyses this problem in detail and aims for a significant higher saliency ratio by local manipulation of the electrical steel lamination properties during the laser cutting process. Contouring the sheet metal by laser cutting is characterized by a high number of degrees of freedom (cutting parameter set) compared to mechanical cutting processes (e.g. punching). This opens up the opportunity for an optimal local setting of magnetic characteristics dependent on the area of the electric machine. Furthermore, using the laser allows the manufacturing of highly filigree structures that cannot be achieved with mechanical methods. The project deals with detailed analysis of the potentials by using the laser for the cutting process of the electrical steel laminations for application in synchronous reluctance motors. The resulting impact on the operational behaviour of the machine is studied in theory and experiment. The analyses can be transferred to other motor types (e.g. PM-motor) as well, even though a lower influence on the machine behaviour is expected.The main objective of the project is a considerable increase of the saliency ratio (+ 25 %) in comparison to current synchronous reluctance motors without decreasing the mechanical stability of the rotor. This leads directly to higher power densities and power factors and therefore higher efficiencies as well. An important contribution to a more widely application of synchronous reluctance machines is expected.

同步磁阻电机被认为是通常使用的永磁同步电机和感应电机的可行替代品。特别是稀土磁体价格（例如 NdFeB）的大幅上涨以及由此导致的永磁电机成本的上涨，导致人们对这种无磁体且具有成本效益的电机类型越来越感兴趣。然而，目前同步磁阻电机较低的功率因数和功率密度仍然阻碍了其更广泛的应用。 d轴和q轴磁通之间高度有限的凸极比（或同步电感比）可以被认为是主要原因。理论分析表明，通过减小漏磁通引导钢桥的宽度可以实现更高的显着比。然而，这导致转子的机械稳定性降低。计划的项目详细分析了这个问题，旨在通过在激光切割过程中局部控制电工钢叠片特性来显着提高显着比。与机械切割工艺（例如冲压）相比，通过激光切割对金属板进行轮廓加工的特点是自由度高（切割参数设置）。这为根据电机面积对磁特性进行最佳局部设置提供了机会。此外，使用激光可以制造机械方法无法实现的高度精细的结构。该项目详细分析了使用激光切割同步磁阻电机中的电工钢叠片的潜力。通过理论和实验研究了由此产生的对机器操作行为的影响。这些分析也可以转移到其他电机类型（例如永磁电机），尽管预计对机器行为的影响较小。该项目的主要目标是显着提高与当前的同步磁阻电机相比，不会降低转子的机械稳定性。这直接导致更高的功率密度和功率因数，从而提高效率。预计将为同步磁阻电机的更广泛应用做出重要贡献。