夹紧力对非晶合金磁特性及铁芯振动的影响研究

Effect of Clamping Force on Magnetic Properties and Core Vibration of Amorphous Alloys

非晶配电变压器铁芯搭卷部分工程上大多处于自由状态,造成该部分振动大、碎屑脱落等问题。为改进此问题,该文研究夹紧力对非晶铁芯磁特性及振动特性的影响。首先测量非晶合金带材的磁特性并搭建具有夹紧力作用的非晶合金卷形铁芯磁特性实验平台,对其进行不同夹紧力作用下基础磁化和磁致伸缩特性的测量。基于测量特性数据,对小型非晶样机进行多物理场耦合计算,得到非晶铁芯在不同夹紧应力下磁通及振动分布。为验证分析方法和结果的准确性,对样机进行振动的测量,实现铁芯不同位置振动位移的对比分析。计算和测量结果表明,适当的夹紧力可以有效地抑制非晶合金卷形铁芯的振动。该文在对小型非晶样机电磁振动计算分析和实验对比的基础上,将模型应用于500kVA的非晶配电变压器,实现对其分析测量的对比,为进一步工程上对非晶电力变压器铁芯夹紧力的预处理提供理论支持和分析方法。

In engineering, the overlap of the amorphous transformer core is mostly without in a free state, causing problems such as large vibration and debris falling off. In order to improve this problem, this paper studied the effect of clamping force on the magnetic and vibration characteristics of amorphous core. Firstly, the magnetic properties of amorphous alloy strip were measured and an experimental platform of magnetic properties of amorphous alloy roll core with clamping force was set up. The basic magnetization and magnetostriction characteristics of amorphous alloy roll core under different clamping forces were measured. Based on the measured characteristic data, the multi-physical field coupling calculation was carried out for the small-scale amorphous prototype, and the magnetic flux and vibration distribution of the amorphous core under different clamping stress were obtained. In order to verify the accuracy of the analysis method and results, the vibration of the analysis prototype was measured, and the comparative analysis of the vibration displacement of different positions of the core was realized. The results of calculation and measurement show that the proper clamping force can effectively restrain the vibration of amorphous alloy roll core. Based on the electromagnetic vibration analysis of a small-scale amorphous prototype, the model was applied to a 500 kVA amorphous distribution transformer. The vibration under different clamping stress was analyzed and the acceleration at multiple positions on the core were measured at last. This paper provided a method for the pretreatment of the clamping force of amorphous transformer in engineering.