Development of A Vector Magnetic Characteristic Controlled Electrical Steel Sheet

Abstract

There is rotational iron loss under the V-junction in the yoke in an actual transformer because not only alternating magnetic field but also rotational and elliptical magnetic field are generated. The rotational iron loss can not be grasped in the standard magnetic measurements because it is assumed that the vectors of magnetic flux density B and magnetic field strength H are scalar quantity in them. We have proposed a two-dimensional vector magnetic measurement technique which can measure the B-vector and H-vector that are in the different directions，additionally，which can grasp the rotational iron loss. There is also phase difference θ_BH between the B-vector and the H-vector. The iron loss is calculated by the inner product between the B-vector and the H-vector. Therefore，the iron loss increases depending on the θ_BH. We controlled the θ_BH by fining the magnetic domain，and developed a new electrical steel sheet，and named “a vector magnetic characteristic controlled electrical steel sheet” which can reduce the iron loss. This paper presents the detail measured results from a vector magnetic characteristic controlled electrical steel sheet.