Three-leg type iron core

Abstract

Abstract PURPOSE:To reduce iron loss of a three-phase three-leg iron core consisting of amorphous magnetic members by a method wherein magnetic annealing is executed by providing exciting windings respectively on outside leg irons. CONSTITUTION:In an iron core for three-phase electromagnetic induction apparatus formed by stacking amorphous magnetic members, exciting windings 30, 31 are respectively wound on outside leg irons 21, 22. When DC power sources 32, 33 are connected to the exciting windings 30, 31 magnetic distribution shown in solid lines 34 is obtained. When annealing is done while executing excitation in this way, magnetic anisotropy meeting the magnetic flux 34 direction is given. When three phase AC exitation is applied to an iron core for electromagnetic induction apparatus provided such the magnetic anisotropy, the occurrence of the rotary magnetic flux at a T junction section is decreased and the direction in the magnetic flux at a corner section is also coincided with the magnetic anisotropy. Therefore, the iron loss of the iron core for electromagnetic induction apparatus can be decreased.

Inventors

• 👤 Yoshihiro Oota
• 👤 大田　美裕

Bibliographic Details