气隙轴向静偏心对发电机定子-绕组受载及振动的影响
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TH165+.3;TH113.1;TM341

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国家自然科学基金资助项目(51777074);河北省自然科学基金资助项目(E2020502032);中央高校基本科研业务费专项基金资助项目(2020MS114,2018YQ03);河北省第三批青年拔尖人才支持计划([2018]-27)


Impact of axially static air-gap eccentricity on load and vibration of stator-winding system in generator
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    摘要:

    通过理论推导、有限元计算和实验验证,研究了气隙轴向静偏心前后同步发电机定子及绕组的受载与振动特性变化。与其他大部分气隙径向偏心的研究不同,本文重点关注气隙轴向静偏心下定子?绕组的受载及振动特性。在分析气隙磁密变化的基础上,推导得到了正常和气隙轴向静偏心下定子径向及轴向不平衡磁拉力、绕组电磁力的表达式。以 CS?5 型发电机为分析对象,进行了有限元仿真计算和实验验证。结果表明,气隙轴向静偏心会在减小定子径向磁拉力和转子抽空端定子绕组电磁力的同时增加定子轴向不平衡磁拉力和转子伸出端定子绕组电磁力,对应地,定子径向振动和转子抽空端定子绕组振动将减小,但定子轴向振动和转子伸出端定子绕组振动将增大;定子轴、径向磁拉力和绕组电磁力及振动均以二倍频为主,夹杂其他各偶次倍频。在定子磁拉力作用下,定子铁芯齿槽端部为最大变形位置;在定子齿槽变形挤压和电磁力共同作用下绕组直线段与端部的连接处易发生磨损,在制造及运行中需给予特别注意。

    Abstract:

    This paper studies on the load properties and the vibration characteristics of the stator-winding system by means of theoretical derivation,finite element calculation,and experimental verification. Different from other researches in the rotor eccentricity topic,this work does not focus on the radial eccentricity but highlights in axially static eccentricity. Detailed theoretical expressions for both the magnetic pulls on the stator core and the electromagnetic force on the armature winding before and after axial eccentricity are derived firstly based on the variation analysis of the magnetic flux density. Then,the finite element calculation and the experimental verification are carried out on the CS-5 prototype generator. It is shown that the axially static eccentricity will reduce the radial magnetic pull on the stator and the electromagnetic force on the armature winding at the rotor-extraction end. However,it will increase the axial magnetic pull on the stator and the electromagnetic force on the armature winding at the rotor-extended end at the meantime. Consequently,the radial stator vibration,together with the armature windings on the rotor-extraction end,will be reduced,while the axial vibration of stator as well as the armature windings on the rotor-extended end will be increased. Both the forces and the vibrations of the stator and windings have prominent amplitudes in the 2nd harmonic which coexists with other tiny odd-harmonic components. In result of the magnetic pulls,the stator core will have the max deformation in the slot at the end sides. This max deformation,which transfers response to the winding,will act together with the winding electromagnetic force and make the joint between the line part and the end part of the winding as the most dangerous insulation wearing point. To protect the winding against the wearing,particular attention should be paid to this joint during manufacturing and monitoring.

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何玉灵,孙 凯,孙悦欣,唐贵基,白 洁.气隙轴向静偏心对发电机定子-绕组受载及振动的影响[J].振动工程学报,2022,35(3):745~759.[HE Yu-ling, SUN Kai, SUN Yue-xin, TANG Gui-ji, BAI Jie. Impact of axially static air-gap eccentricity on load and vibration of stator-winding system in generator[J]. Journal of Vibration Engineering,2022,35(3):745~759.]

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  • 在线发布日期: 2022-07-19
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