Vibration and Noise Characteristics of Nanocrystalline Cores Under High-Frequency and Non-Sinusoidal Excitation

With the widespread use of high-power high-frequency transformers in flexible dc transmission, high-power density motor drive control, and high-power charging fields, the vibration and noise of high-frequency transformers have been drawing more and more attention from the industry. The nanocrystalline materials are commonly used in the core structure of high-frequency transformers. Although it is generally believed that the magnetostriction of nanocrystalline materials is extremely low, the vibration noise is still very obvious for the nanocrystalline cores. Therefore, it is necessary to study the vibration and noise characteristics of nanocrystalline cores, especially under the excitation of square or rectangular excitation. This article constructs a non-sinusoidal measurement system, and the vibration and noise characteristics of rectangle nanocrystalline core under sinusoidal and non-sinusoidal excitations up to 5 kHz are measured. Meanwhile, the effect of zero-level times on vibration characteristics is also studied.