Figures 3 and 4- will minimize the effective air gap eg in a low cost manner by increasing the matching surface area of the two segments and thus reducing the reluctance. The matching surface area of a straight cut core is defined as: A = Dx E. The matching surface area of a Cut angle (Figures 3 and 4) is defined as:

The reluctance of a straight cut core is:



The reluctance of a Cut Angle core is:



The current acquired by air gap of a straight cut core is:



The current acquired by air gap of a Cut Angle core is:

Equation (3) above shows the current acquired by air gap of an Angle cut core is reduced by a factor of cosa (Cosa is always smaller than 1, therefore I'_gap is always smaller than I _gap).

The current I'_gap of a core with a 45° cut is 30% less when compared to a straight cut core, and I'_gap of a core with a 60° cut is less than 50% when compared to the same core having a straight cut. This we have experimentally verified.