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

Abstract

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 500kVA 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.