Development of an electrical steel sheet developed by vector magnetic characteristic control

Abstract

There is a rotational iron loss under the V-junction in the back yoke in actual transformer because the direction of the magnetic flux density vector B (B-vector) changes with time. A rotational iron loss can't be grasped in the standard magnetic measurement because it is assumed that vectors of magnetic flux density B and magnetic field strength H are scalar quantity in the standard magnetic measurement. We have proposed the 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 a phase difference θ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">BH</sub> between B-vector and H-vector. The iron loss is calculated by the inner product between B-vector and H-vector. Therefore, the iron loss increases depending on the θ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">BH</sub> . We controlled the θ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">BH</sub> by fining the magnetic domain, and developed a new electrical steel sheet developed by vector magnetic characteristic control which can reduce the iron loss. This paper presents the detail measured results from the new electrical steel sheets developed by vector magnetic characteristic control.