Considering the real design, additional constraints
should include the positive requirement of a, b, d, and h,
and the positive integer requirement of turn number N. Also
to avoid strange shape of the core, some constraints have
been set for the relationships between the four dimensional
variables according to commercial core dimension lists from
MAGNETICS® [27]. With the use of the MATHWORKSTM
MATLAB® Optimization Toolbox, the design solution can
be found numerically.