volume | PIER Journals

Abstract

The novel amorphous alloy transformer featuring a closed three-dimensional coil core (CTDCC) represents an innovative approach to transformer structure. In contrast to the conventional three-phase five-column transformer equipped with a planar coil core (PCC), the CTDCC configuration displays a completely equal magnetic circuit, leading to improved short-circuit tolerance. Nevertheless, the design and manufacturing process of the core faces a notable engineering obstacle due to the amplified magnetostrictive coefficient of the amorphous alloy, resulting in vibration noise. In order to address this issue, a magnetic-mechanical coupling mathematical model is developed in this research to analyze the magnetostrictive effect of the amorphous alloy CTDCC. Three-dimensional finite element analysis (FEA) is utilized to compute the magnetic flux distribution and quivering dislocation dissipation of the CTDCC. Furthermore, a validation experiment is carried out on a 30 kVA amorphous alloy CTDCC model to confirm the precision of the model. Moreover, the CTDCC structure has been proven to effectively minimize surface vibrations compared to the PCC model. Additionally, it unveils the governing frequency law of vibration movement at various locations within the CTDCC structure. This revelation serves as a fundamental basis for developing strategies to mitigate vibrations and control noise during the CTDCC design.

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Mr. Romaric Kammeugue Noubissi

Dr. Daosheng Liu

Dr. Boxue Du