ABSTRACT
Considerable difficulty is encountered in mastering the field of magnetics because of the use of so many different systems of units – the centimeter-gram-second system, the meter-kilogram-second system, and the mixed English units system. The coil, in fact, exhibits a magnetic field exactly like that of a bar magnet, the coil has a north pole and a neutral center region. The reluctance of a core depends on the composition of the material and its physical dimension and is similar in concept to electrical resistance. The relationship between mmf, flux, and magnetic reluctance is analogous to the relationship between emf, current, and resistance. Fringing flux has been around since time began for the power conversion engineer. Designing power conversion magnetics that produce a minimum of fringing flux has always been a problem. The fringing flux effect is a function of gap dimension, the shape of the pole faces, and the shape, size, and location of the winding.
