Abstract
A novel magnetic properties tester is designed to accurately and conveniently change the air gap of the core, which can fix cores of various types. The dynamic magnetic characteristics of the amorphous core under sinusoidal excitation within 20 kHz is measured with different air gap lengths and magnetic flux density. It is found that in the case of the small air gap, the total loss decreases as the air gap increases. When the frequency is 20 kHz and the flux density is 0.1 T, the loss can even be reduced by 7%. This paper analyzes the experimental data and summarizes the influence of the air gap and magnetic flux density about the core loss. Besides, the influence of air gap on magnetic flux density distribution is illustrated and analyzed by the means of FEM (Finite Element Method). It is valuable for the design of high frequency transformer and inductor.
Highlights
The magnetic cores play an important role in a power converter, especially when the frequency is higher
It has been found that the gap loss in semicircular cores is lower than Ctype cut cores; in ferrite cores, core loss varies little with the change of the gap length; the loss will be reduced by reducing the width of the laminations
A novel magnetic properties testing structure is designed for adjusting air gap length of the C-type cores, which can fix various types of magnetic cores and realize the adjustment of the air gap length with an accuracy of 0.02 mm
Summary
The magnetic cores play an important role in a power converter, especially when the frequency is higher. It has been found that the gap loss in semicircular cores is lower than Ctype cut cores; in ferrite cores, core loss varies little with the change of the gap length; the loss will be reduced by reducing the width of the laminations.. It has been found that the gap loss in semicircular cores is lower than Ctype cut cores; in ferrite cores, core loss varies little with the change of the gap length; the loss will be reduced by reducing the width of the laminations.4 Based on these findings, scholars proposed some methods to reduce the air gap loss, but these methods undoubtedly increase the manufacturing cost. A novel magnetic core fixing device is designed to control the air gap This device can fix C-type and Etype cores, and can adjust air gap length accurately. The mechanism of core loss, firstly decreasing and increasing, is explained by FEM
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