VP13-05 Vibration and Noise Measurement of High-frequency Transformer Cores with Different Shapes Under Non-Sinusoidal Excitation
Creators: Xueqing Liu
Shuaichao Yue
Yu Dou
Tao Chen and Yongjian Li
Publisher: name: IEEE
Year: 2025

With the rapid development of power electronic technology and the widespread use of new magnetic materials, the application of high-frequency transformers is becoming increasingly widespread. Compared to traditional transformers, high-frequency transformers have more diminutive size, higher power density, and environmental friendliness. Therefore, they are widely used in smart grids, photovoltaic power generation, wind power, electric vehicles, and other fields, making them indispensable core equipment in power electronic transformers [1-3]. This study chooses the widely used magnetic material nanocrystalline 1K107 to fabricate four different shapes of transformer cores: rectangular, square, ring, and oval, as shown in Fig.1. The vibration and noise characteristics of these different geometric core shapes were measured under sinusoidal and square wave excitations. The study includes analyses of the vibration velocity and noise of cores with different geometric shapes, exploring the impact of excitation waveforms and geometric shapes on the vibration and noise of high-frequency transformers. Experimental results indicate that the amplitude of vibration velocity and noise increases with increased excitation frequency and magnetic flux density. Vibration and noise under square wave excitation are more significant than under sinusoidal excitation. Under square wave excitation, vibration contains more even-order high-frequency harmonics, leading to more severe waveform distortion. Fig.2 shows that the vibration of rectangular core is the largest, followed by oval and square ones, while the vibration and noise of ring core is the smallest. A more symmetrical geometric structure can effectively reduce the vibration and noise of the core.References: [1] P. C. Sarker, M. R. Islam and Y. Guo, State-of-the-art technologies for development of high frequency transformers with advanced magnetic materials, IEEE Trans. Appl. Supercond., vol. 29, no. 2, pp. 1-11(2019). [2] M. Mogorovic, and D. Dujic, Sensitivity analysis of medium-frequency transformer designs for solid-state transformers, IEEE Trans. Power Electron., vol. 34, no. 9, pp. 8356-8367(2019). [3] Y. Li, Z. Yang and C. Zhang, vibration and noise measurement of medium-high frequency transformer cores under non-sinusoidal excitation, IEEE Trans. Magn., vol. 58, no. 8, pp. 1-5(2022).
With the rapid development of power electronic technology and the widespread use of new magnetic materials, the application of high-frequency transformers is becoming increasingly widespread. Compared to traditional transformers, high-frequency transformers have more diminutive size, higher power density, and environmental friendliness. Therefore, they are widely used in smart grids, photovoltaic power generation, wind power, electric vehicles, and other fields, making them indispensable core equipment in power electronic transformers [1-3]. This study chooses the widely used magnetic material nanocrystalline 1K107 to fabricate four different shapes of transformer cores: rectangular, square, ring, and oval, as shown in Fig.1. The vibration and noise characteristics of these different geometric core shapes were measured under sinusoidal and square wave excitations. The study includes analyses of the vibration velocity and noise of cores with different geometric shapes, exploring the impact of excitation waveforms and geometric shapes on the vibration and noise of high-frequency transformers. Experimental results indicate that the amplitude of vibration velocity and noise increases with increased excitation frequency and magnetic flux density. Vibration and noise under square wave excitation are more significant than under sinusoidal excitation. Under square wave excitation, vibration contains more even-order high-frequency harmonics, leading to more severe waveform distortion. Fig.2 shows that the vibration of rectangular core is the largest, followed by oval and square ones, while the vibration and noise of ring core is the smallest. A more symmetrical geometric structure can effectively reduce the vibration and noise of the core.References: [1] P. C. Sarker, M. R. Islam and Y. Guo, State-of-the-art technologies for development of high frequency transformers with advanced magnetic materials, IEEE Trans. Appl. Supercond., vol. 29, no. 2, pp. 1-11(2019). [2] M. Mogorovic, and D. Dujic, Sensitivity analysis of medium-frequency transformer designs for solid-state transformers, IEEE Trans. Power Electron., vol. 34, no. 9, pp. 8356-8367(2019). [3] Y. Li, Z. Yang and C. Zhang, vibration and noise measurement of medium-high frequency transformer cores under non-sinusoidal excitation, IEEE Trans. Magn., vol. 58, no. 8, pp. 1-5(2022).