大型抽水蓄能电机低频电磁力分析计算  

Analysis and Calculation of Low Frequency Electromagnetic Force for Large Pumped-Storage Motor/Generator

作　　者：孙玉田[1] 刘熠辰 李金香[1] 

机构地区：[1]哈尔滨大电机研究所,哈尔滨150040 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《大电机技术》2017年第6期35-39,共5页Large Electric Machine and Hydraulic Turbine

摘　　要：随着机组容量的增加,低频振动问题越来越受到关注。到目前为止,国内投运的数十台大容量水电机组都不同程度地存在着低频振动问题,有些机组的振动甚至超过标准的规定限值。针对这一问题,本文对低频振动的机理进行分析,探讨低频电磁力产生的原因、研究其计算方法,并以抽水蓄能电机为例,计算分析低频电磁力及其影响因素。结果表明:低频电磁力的大小随气隙偏差、不圆度、气隙磁密增加而增大,随气隙长度增加而减小。虽然在制造和安装的过程中无法消除这些因素,但可以通过提高转子加工和安装精度,最大限度地减小电磁力和降低低频电磁振动,以保证振动幅值小于标准要求而使机组能长期安全可靠运行。With the increase of unit capacity, low frequency vibration is more and more concerned.Up to now, the low frequency vibration of dozens of large capacity hydropower units occurred indifferent degrees in our country. Vibration amplitude of some units is even greater than the standardvalues. Thus, the mechanism of low frequency vibration is analyzed, analytical method of lowfrequency electromagnetic force is presented and its causes are discussed in the paper. Then, lowfrequency electromagnetic force is calculated by methods proposed for pumped-storagemotor/generator and its influencing factors were discussed. It is shown that amplitudes oflow-frequency electromagnetic force increases with the increase of air gap deviation, in-roundnessand airgap magnetic density, and decreases with the increase of air gap length. Although these factorscannot be eliminated in the process of manufacturing and installation, the precision of the stator/rotorprocessing and installation can be improved, to minimize electromagnetic force, reduce lowfrequency electromagnetic vibration, and ensure that the vibration amplitude is less than the standard,thus the unit can operate safely and reliably.

关 键 词：抽水蓄能电机 低频振动 电磁力 

分 类 号：TM301.4[电气工程—电机]