The three-dimensional electromagnetic simulation analysis of power transmission of loosely coupled transformer based on ANSYS

Abstract

The loosely coupled transformer (also called separable transformer) is the key component of inductive coupled power transfer (ICPT) system. Its coupling coefficient is very low which limits transmission efficiency of ICPT system. This paper describes the principle of ICPT system, and utilizes ANSYS software to simulate magnetic field of loosely coupled transformer. Three-dimensional simulation can show the core structure more clearly, and makes the results of analysis more accurate. Through quantitative analyzing the distributions of magnetic field intensity, magnetic flux density of loosely coupled transformer and the secondary-side load electromotive force, the paper draws a conclusion that the key technical parameters, such as operating frequency, air gap, core thickness and magnetic core position shift etc have significant impact on the coupling coefficient of the loosely coupled transformer. Furthermore, the transmission efficiency is improved during the resonance after adding capacitors to primary side in the circuit. The simulation analysis of the relationship between the key parameters and the coupling coefficient will be very helpful for the development of loosely coupled transformer and subsequent experiments.