Active Noise Reduction of Amorphous Alloy Three-Dimensional Coiled Cores

The negative effects of vibration and noise generated by amorphous alloy transformers on daily life have become increasingly significant due to their extensive use. Consequently, there is an urgent need to mitigate these vibrations and noise level. The primary source of vibration and noise in amorphous alloy transformers arises from the magnetostrictive effect of the amorphous alloy core; thus, reducing the noise generated by the core will consequently lead to a decrease in the overall noise produced by the transformer. In this paper, we initially developed a vibration testing platform specifically for the iron core, using a vibration sensor to analyze the vibration characteristics of the core. After identifying the peak frequency of core vibration, established a three-dimensional simulation model of the core. A speaker was employed as a secondary sound source to implement active noise reduction at this frequency, based on the principle of sound wave interference cancellation. Experimental and simulation results indicate that the core exhibits the most intense vibrations at 200 Hz, and active noise reduction at this frequency can significantly decrease both core vibration and noise, thereby providing theoretical support for noise suppression in amorphous alloy three-dimensional coiled core transformers.