Characteristics Analysis and Experimental Verification of Amorphous Metal Distribution Transformer Core Vibration Coupled by Electromagnetic - Mechanical Field

Abstract

With the requirement of high efficiency and low cost for distribution transformer, amorphous metal distribution transformer (AMDT), fabricated by employing amorphous alloy strip as the core, shows a great developmental potential in power equipment industry. However, due to the disadvantages of large magnetostriction and excessive sensitive to stress, the AMDT core can not be fully clamped, which leads to higher vibration magnitude than silicon steel one. The core vibration characteristic analysis environment is a typical multi-physical field, and many researchers tried to calculate the magnetic and dynamic parameters by FEA, but the simulation results are not convinced because of lacking experimental verification. In this paper, a 3-D model of AMDT core was established, and the magnetic flux density and electromagnetic force were calculated by coupling analysis of electromagnetic and mechanical field. To verify the simulation results, a vibration testing platform of the AMDT core was built, and the piezoelectric vibration acceleration sensor were adopted to obtain the vibration signals. The experiment results show that the vibration intensity at upper yoke is larger than other area, which is consistent with the simulation result.