Motor/Alternator and Magnetic Bearing Design for Advanced Flywheel Energy Storage Systems

提出了发展低成本飞轮储能技术的设想. 飞轮储能是一种重要的候选技术，可应用于电力驱动车辆，特别是混合动力车辆，以及在发展中国家可能使用的固定应用，包括不间断电源，分布式储能和离网电力系统。 飞轮能量存储相对于替代品的优势在于其结合了非常高的功率密度沿着其中等至相应的高能量密度。一种用于实现低成本飞轮能量存储系统的方案有待研究，依赖于使用单个高强度铁磁性钢结构构件，该构件足以作为适当尺寸的电动机的能量存储转子和集成转子。交流发电机 如提案中所概述的，这样的方案可以产生功能和成本有效的高功率电能存储库。 研究的主要重点将放在原型硬件的设计、制造和测试上，以证明这一概念。工作将集中在这种集成电机/交流发电机的设计上，以及为这种应用设计合适的主动磁轴承系统。 特别是，主动磁轴承，结合自检测的轴承控制绕组也被有效地用于sensingis提出。 现有的主动磁轴承由于需要安装单独的专用位置传感装置沿着所需的支持硬件和功率而受到复杂性的困扰，结果是这些磁轴承系统的高成本和可靠性受损。

The development of cost effective flywheel energy storage technology isproposed. Flywheel energy storage is an important candidate technology for applicationin electric drive vehicles, especially in hybrid electric vehicles, and in stationaryapplications including uninterruptible power supplies, distributed energy storage, and off-grid power systems as potentially used in the developing world. The distinguishingadvantage of flywheel energy storage with respect to the alternatives is its combinationof very high power density along with its moderate to respectively high energy density.One scheme for realizing a low-cost flywheel energy storage system, to be investigated, relieson the use of a single high-strength ferromagnetic steel structural member that suffices as both the energy storage rotor and the integrated rotor of an appropriately dimensionedmotor/alternator. As outlined in the proposal, such a scheme can result in a functionaland cost effective high-power electrical energy storage reservoir. The main focus of the researchwill be on the design, fabrication, and test of prototype hardware to prove out this concept.The effort will focus on the design of this integrated motor/alternator, and on the design of a suitable active magnetic bearing system for this application. In particular, an active magnetic bearing that incorporates self-sensing where the bearing control windings are also effectively used for sensingis proposed. Existing active magnetic bearings suffer from complexity due to the need to incorporateseparate dedicated position sensing devices, along with the required support hardware and power.A consequence is in high cost and compromised reliability of these magnetic bearing systems.