Vibration and noise characteristics of high-frequency amorphous transformer under sinusoidal and non-sinusoidal voltage excitation

Abstract

The vibration test of silicon steel, amorphous and nanocrystalline magnetic rings shows that the magnetostriction of amorphous materials is much larger than that of silicon steel and nanocrystalline. This paper focuses on the measurement and analysis of the vibration and noise of a 5kVA/4.5 kHz amorphous high-frequency transformer (HFT) under sinusoidal and non-sinusoidal excitation. Comparing and analyzing the measured data of vibration and noise, the results show that the vibration of HFT under the non-sinusoidal excitation is much larger than that of the sinusoidal excitation. The vibration excited by sinusoidal excitation basically concentrates on the double frequency of the excitation. Most of the vibration under non-sinusoidal excitation is also on the double frequency, but contains many harmonics. The influences are analyzed of duty cycle of rectangular excitation and the natural frequency of HFT on the vibration and noise.