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：该概念的新颖性包括将轴向主动磁性轴承供应整合到无轴承电动机的逆变器摄食中，以降低系统成本。特别是，轴向活性磁性轴承连接在无轴承电动机定子绕组的两个恒星之间，该轴向绕组由零序电流馈入。这会供应轴向磁性轴承。关键影响受到牙齿的牙齿和深入的研究。该原型是（参数）设计，构建和测量的。该概念还应用于ODER中的模拟中的高功率类别，以识别尺寸效果。进行了不同的功率类别和常规饲养原型之间的比较。准备工作：新颖概念的可行性原则上已显示出来。某些电动机和逆变器约束伴随着零序电流，已定性得出。此外，在理论上已经讨论了转子永久磁铁中由于涡流引起的干扰力。通过这项初步工作，该项目在研究结果方面的成功是现实的。只有在解释理论上的实际认可之后，才有可能对概念进行最终验证。该项目完全缩小了这一差距，即对操作限制的理论和实际研究。特别是，回答了以下问题：a）扭矩和悬架力的变化如何增加零序的电流和较高的电力类别？b）电动机内部损失组成的变化如何变化，以增加零序列的电流和较高功率等级的增加？c）逆变器切换频率更高的速度转换频率是多少，以绘制轴向位置的动力学范围，以驱动轴向控制的动态ig ig？必须在逆变器中提供储备金，以使轴向位置控制足够动态吗？机器，这对于高功率类可扩展吗？