In article example of dielectromagnetics cores working in circular rotational magnetic fields of electric converters are presented. The main advantage of dielectromagnetics can be naturally isotropy of magnetic cores but, in some solutions, profitable can be artificially prepared anisotropy properties. The characteristic with distribution of magnetic circular rotating field in dielectromagnetic made without additional anisotropy process is shown. The obtained measurement results of distribution of magnetic circular rotating field confirm the natural isotropy of dielectromagnetic.