基于漏磁引流效应的凸极同步发电机转子磁极不圆度检测

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Rotor pole non-roundness detection of salient pole synchronous generator based on leakage flux diversion effect

WU Yucail， LIU Yanze’，YE Chao²， ZHOU Tianhua²，YANG Guangyong²， BAI Yuhui 1 （1.NationalKeyLaboratoryof NewEnergy Power System，North ChinaElectric Power University，Baoding O71003，China; 2.Huaneng Lancang River Hydropower Co.， Ltd. Maintenance Branch，Kunming 65Oo51，China）

Abstract： When the non-roundness of the rotor pole in a large salient pole synchronous generator exceeds the permissible limit，it can lead to severe vibrations of the stator core，stator scrapping rotor，and other operational failures.This fault displays distinct characteristics in the generator's leakage magnetic field. Accurate collection and analysis of magnetic flux leakage signals from the external frame enable the online detection of rotor magnetic pole non-roundness. Firstly，the air gap magnetic field characteristics of the rotor pole in diferent concave and convex shapes were analyzed. The leakage flux spectrum of the generator’s external frame reveals a fault criterion for rotor pole non-roundness， specifically the k/p -order harmonic component. Secondly， it was proposed to fit the U-shaped core tightly on the frame，create a diversion circuit to enhance leakage flux，and analyze the measuring coil’s induced voltage frequency spectrum to detect rotor pole non-roundnessfaults in real-time.Finally，the fault simulation experiment on a salient pole synchronous generator set was complete. Results show that the amplitudes of the 1/2 -order and 3/2-order harmonic components of the induced voltage spectrum increased with worsening faults， effectively detecting non-roundness faults in the rotor pole.

Keywords：salient pole synchronous generator； rotor pole non-roundness ； leakage flux analysis ； diversioneffect；measuring coil; spectrum analysis

0引言

大型凸极同步发电机转子多采用组装工艺制造，在装配磁极过程中，转子圆度存在一定误差[1]设备运行阶段的离心力与热应力也将导致转子磁极沿径向发生位移，造成转子外缘形态的改变。（剩余14736字）