PURPOSE: To generate continuous electromotive force by a method wherein respective output coils of electromotive force generating element are connected in series and parallel while an auxiliary field and a main field, which are provided with reverse polarities mutually as an external field, are impressed sequentially by a moving mechanism based on natural or artificial energy.

CONSTITUTION: A comparatively weak auxiliary field is impressed to magnetize the outer peripheral part of a composite magnetic body so that the magnetizing direction of the outer peripheral part is reverse to the magnetizing direction of a center line part. Next, when the main field of comparatively strong reverse polarity is impressed, the magnetizing direction of the outer peripheral part is converted; however, the conversion upon this conversion becomes a sudden reversing phenomenon. Accordingly, a very steep pulse type electromotive force is induced in an output coil. When an external field, enough for displacing the outer peripheral part of the composite magnetic body into the same direction of the center line part, is impressed in such a manner, a performance to induce an electromotive force, having a constant magnitude regardless of the rate of the time change of the external field, may be obtained.