Force calculation with analytical accuracy in the finite element based computational magnetostatics

A method that can improve the accuracy of force calculations by the Maxwell stress method is presented. The local fields on the stress contour is obtained from the original finite element solution by subtracting the field of the discretization current sheet. Every field point has a contribution in the force calculation. The results show that this method is independent of the contour. The contour can be laid on the surface of the iron, and that allows the surface force density to be calculated.