IES: Equalising airgap radial forces in direct drive generators

IES：均衡直驱发电机中的气隙径向力

• 批准号: 2737267
• 金额: --
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2737267
• 关键词: IES; Equalising; airgap; radial; forces

Permanent magnet generators for direct-drive wind turbines normally have massive weight to hold the stiffness and small airgap for higher flux density. However, the airgap would deflect during operation due to the effects like electromagnetic attraction force, gravitational pull, rotational velocity, nacelle motion and unbalanced magnetic pull etc. One of the downsides of small airgap clearance is the tremendous attraction force between stator and rotor. Such large magnitude attraction force combined with varying airgap clearance has always been a major challenge to the generator stiffness.The project intends to develop an equalization strategy of the radial attraction forces within the airgap during real-time operation, enabling smaller airgap clearances and reducing the material cost of these large generators. The intention is to equalize the radial forces in different parts of the machine by controlling discrete three-phase stator "modules" with variable flux-weakening and flux-strengthening capability. The sub-objectives of the project are to improve the magneto-static control strategy and extend it to the rotating machine. With validation using Finite Element Analysis and testing on real prototype, the project would then develop an attached multi-converter system to realize the equalization.

用于直接驱动风力涡轮机的永磁发电机通常具有巨大的重量以保持刚度和较小的气隙以获得更高的磁通密度。然而，气隙会偏转在操作过程中，由于像电磁吸引力，重力，转速，机舱运动和不平衡的磁拉力等的影响，小的气隙间隙的缺点之一是定子和转子之间的巨大吸引力。如此大的吸引力加上变化的气隙间隙一直是对发电机刚度的主要挑战。该项目旨在开发一种在实时操作期间气隙内径向吸引力的均衡策略，从而实现更小的气隙间隙并降低这些大型发电机的材料成本。其目的是通过控制具有可变弱磁和强磁能力的离散三相定子“模块”来均衡电机不同部件中的径向力。本计画的子目标是改进静磁控制策略，并将其延伸至旋转机械。通过有限元分析和真实的样机测试验证，本项目将开发一个附加的多转换器系统来实现均衡。