Design and control of a bearingless permanent magnet synchronous machine with a combined double-three-phase winding for torque and lateral force generation and star point-connected axial active magnetic bearing

双三相组合绕组产生扭矩和侧向力、星点连接轴向主动磁轴承无轴承永磁同步电机的设计与控制

• 批准号: 437667923
• 负责人: Professor Dr.-Ing. Andreas Binder
• 金额: --
• 依托单位: Institut für Elektrische Energiewandlung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/437667923?language=en
• 关键词: Design; control; bearingless; permanent; magnet

The innovation:The novelty of the concept includes the integration of the axial active magnetic bearing supply into the inverter feeding of the bearingless motor for the sake of system cost reduction. In particular, the axial active magnetic bearing is connected between the two star-points of the bearingless motor stator winding, which is fed by a zero-sequence current. This feeds the axial magnetic bearing.Content of the project:The concept is realized on a 1 kW / 60000 rpm bearingless drive in order to investigate its operation limits. Critical influences are dentified and profoundly investigated. The prototype is (parametrically) designed, built and measured. The concept is also applied to higher power classes in simulation in oder to identify sizing effects. Comparisons between different power classes and with conventionally fed prototypes are made.Preparing work:The feasibility of the novel concept has been shown in principle and simulation. Some of the motor and inverter constraints, accompannied with the zero-sequence current, have been derived qualitatively. Moreover, the disturbing force due to eddy currents in the permanent magnets of the rotor have been discussed in theory. With this preliminary work the success of the project with regards to the research results is realistic.Aim of the project:For profound recognitions regarding limits of the application range for the concept, a fundamental design methodology, including scalability, and the realization in practice is essential. Only after explaining the practical recognitions in theory, a final validation of the concept is possible. This project closes exactly this gap, i.e. theoretical and practical investigation of the operation limits. In particular, the following questions are answered:a) How does the torque and suspension force ripple change for increased zero-sequence current and at higher power classes?b) How does the composition of losses change within the motor for increased zero-sequence current and at higher power classes?c) How much does the inverter switching frequency influence the dynamic of the axial position control and which conclusions can be drawn for IGBT-inverters of higher power classes?d) How much voltage reserve must be provided in the inverter for sufficient dynamic of the axial position control?e) Which winding topologies are suitable for bearingless motors with zero-sequence current feeding?f) To which extent has the stiffness of the radial position control to be increased in order to compensate for disturbing forces due to eddy current effects and which conclusions can be drawn for system control?g) From which electrical conductivity are massive permanent magnet materials inappropriate for bearingless machines and is this scalable for higher power classes?

创新：该概念的新颖之处在于将轴向主动磁力轴承电源集成到无轴承电机的逆变器馈电中，以降低系统成本。具体地，轴向主动磁轴承连接在无轴承电机定子绕组的两个星点之间，由零序电流馈电。这为轴向磁力轴承提供动力。项目内容：该概念在 1 kW / 60000 rpm 无轴承驱动器上实现，以研究其运行极限。确定并深入研究了关键影响。原型经过（参数化）设计、建造和测量。该概念也适用于模拟中的更高功率等级，以便识别尺寸效应。对不同功率等级和传统馈电原型进行了比较。准备工作：新概念的可行性已在原理和仿真中得到证明。一些电机和逆变器的约束以及零序电流已经被定性地导出。此外，还从理论上讨论了转子永磁体中的涡流引起的干扰力。通过这项前期工作，该项目在研究成果方面的成功是现实的。该项目的目标：为了深刻认识到概念应用范围的局限性，包括可扩展性在内的基本设计方法以及实践中的实现是基本的。只有在理论上解释了实际认识之后，才有可能对该概念进行最终验证。该项目正是弥补了这一差距，即对操作极限的理论和实践研究。特别是，回答了以下问题：a) 对于增加的零序电流和更高的功率等级，扭矩和悬架力脉动如何变化？b) 对于增加的零序电流，电机内的损耗构成如何变化c) 逆变器开关频率对轴向位置控制的动态影响有多大？对于更高功率级别的 IGBT 逆变器可以得出哪些结论？d) 逆变器中必须提供多少电压储备为了获得足够的轴向位置动态控制？e) 哪种绕组拓扑适合零序电流馈送的无轴承电机？f) 径向位置控制的刚度需要增加到什么程度才能补偿涡流效应引起的干扰力以及哪些结论可用于系统控制？g) 块状永磁材料的导电性不适合无轴承机器，并且可以扩展到更高功率等级吗？