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典型的永磁同步电机和感应电机的可行替代方案。特别是稀土磁体价格的大幅上涨（例如钕铁硼）以及由此导致的pm机器成本的提高，导致人们对这种无磁体且因此具有成本效益的电机类型的兴趣增加。然而，目前同步磁阻电机的功率因数和功率密度相对较低，仍然阻碍了同步磁阻电机的广泛应用。d轴和q轴磁通之间的显著性比（或同步电感比）非常有限，可以认为是主要原因。理论分析表明，减小漏磁导钢桥的宽度可以获得更高的显著比。然而，这导致转子的机械稳定性下降。计划中的项目详细分析了这一问题，并旨在通过在激光切割过程中局部操纵电工钢层合性能来显著提高显着率。与机械切割工艺（如冲孔）相比，通过激光切割成形金属板材的特点是自由度高（切割参数集）。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，使用激光可以制造高度精细的结构，这是机械方法无法实现的。该项目详细分析了用激光切割同步磁阻电机用电工钢片的电势。由此产生的影响，对机器的操作行为进行了理论和实验研究。即使对机器行为的影响较小，分析也可以转移到其他电机类型（例如pm电机）。该项目的主要目标是在不降低转子机械稳定性的情况下，与当前的同步磁阻电机相比，显著性比（+ 25%）大幅增加。这直接导致更高的功率密度和功率因数，因此也更高的效率。期望对同步磁阻电机的更广泛应用做出重要贡献。