Rotor Retaining Sleeve Design for a 1.12-MW High-Speed PM Machine
Rotor Retaining Sleeve Design for a 1.12-MW High-Speed PM Machine
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DOI：
10.1109/tia.2015.2423659
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发表时间：
2015-04
影响因子：
4.4
通讯作者：
Fengge Zhang;Guanghui Du;Tianyu Wang;Guangwei Liu;W. Cao
中科院分区：
文献类型：
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作者：
Fengge Zhang;Guanghui Du;Tianyu Wang;Guangwei Liu;W. Cao
永磁同步电机(PMSM)在转矩密度、能效和可控性等方面具有优异的性能。然而，转子上的PM容易受到离心力的作用，这可能会破坏它们的物理完整性，特别是在高速运行时。通常，PM与碳纤维捆绑在一起，或由转子表面的合金套筒固定。本文介绍了1.12 MW 18 kr/min永磁电机转子护套的设计，并用二维有限元方法对其电磁性能进行了分析。对转子的应力进行了理论和数值分析。对于碳纤维保护措施，从工作温度、转子转速、护套厚度和过盈配合等方面比较了三种粉末冶金结构和三种极填充材料的应力。在此基础上，提出了一种新的混合式保护措施，并对其进行了二维有限元分析，运行速度可达22kr/min(额定速度的1.2倍)。比较了碳纤维挡套和混合挡套的转子损耗和机械温度，并对套筒的设计进行了改进。使用这两种设计的两个转子进行了原型和实验测试，以验证所开发的用于永磁电机的技术的有效性。开发的固定套筒使其能够以22kr/min的高速运行兆瓦级的永磁电机。这为许多高功率高速应用打开了大门，例如涡轮发电机、航空航天和潜艇电机驱动。
Permanent-magnet (PM) synchronous machines (PMSMs) can provide excellent performance in terms of torque density, energy efficiency, and controllability. However, PMs on the rotor are prone to centrifugal force, which may break their physical integrity, particularly at high-speed operation. Typically, PMs are bound with carbon fiber or retained by alloy sleeves on the rotor surface. This paper is concerned with the design of a rotor retaining sleeve for a 1.12-MW 18-kr/min PM machine; its electromagnetic performance is investigated by the 2-D finite-element method (FEM). Theoretical and numerical analyses of the rotor stress are carried out. For the carbon fiber protective measure, the stresses of three PM configurations and three pole filler materials are compared in terms of operating temperature, rotor speed, retaining sleeve thickness, and interference fit. Then, a new hybrid protective measure is proposed and analyzed by the 2-D FEM for operational speeds up to 22 kr/min (1.2 times the rated speed). The rotor losses and machine temperatures with the carbon fiber retaining sleeve and the hybrid retaining sleeve are compared, and the sleeve design is refined. Two rotors using both designs are prototyped and experimentally tested to validate the effectiveness of the developed techniques for PM machines. The developed retaining sleeve makes it possible to operate megawatt PM machines at high speeds of 22 kr/min. This opens doors for many high-power high-speed applications such as turbo-generator, aerospace, and submarine motor drives.