Yasufumi Ikkai

Application of fine-grained doubly oriented electrical steel to IPM synchronous motor

Application of fine-grained doubly oriented electrical steel sheets that have a strong {100}<001> texture to synchronous interior permanent magnet motors has been investigated. The alteration in stator core material from high grade nonoriented electrical steel sheets to the doubly oriented material with a simple change in stator design was found to lead to an increase in efficiency up to more than 2%. This efficiency increase is ascribed to a larger permeability and a lower iron loss in two perpendicular directions of the doubly oriented material. Finite-element analysis has revealed that the magnetic field distribution in stator cores made of the doubly oriented material is largely different from that in stator cores made of the nonoriented material.

Application of fine-grained doubly oriented electrical IPM synchronous motor

The magnetic core materials for motors have been mostly limited to non-oriented electrical steels of which crystallographic texture is almost random, although there is a possibility to greatly improve performance of motors by the use of steels with textures such as {100}<001>.The purpose of this research is to investigate how the performance of motors can be improved by the use of such a textured material by building actual motors using a doubly oriented electrical steel that has a strong {100}<001> texture. This key material in this investigation has been prepared by the process so-called oxide-separator-induced decarburization that has been found recently.