Acta Medica Okayama 18 6 1982 Magnetic performance of step-lap joints in distribution transformer cores 1055 1057 EN Takayoshi Nakata N. Takahashi Y. Kawase <p>The magnetic characteristis of cores with step-lap joints are analyzed by using the finite element method taking into account eddy current and magnetic saturation. The effects of the following factors on the magnetic characteristics such as flux and eddy current distributions and magnetizing current are clarified quantitatively. 1)step-lap length 2)length of air gap at the joint 3)number of laminations per one stagger layer 4)flux density (magnetic saturation) Obtained results give useful suggestions improving the design of the joints of transformer cores.</p> No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 18 6 1982 Application of the finite element method to the design of permanent magnets 1049 1051 EN Takayoshi Nakata N. Takahashi <p>A new method of determining the lengths of magnets in a magnetic circuit by using the finite element method has been developed. This method has the advantage that the lengths of magnets which produce the prescribed flux distribution can be directly calculated. In this paper, the error of this method is discussed at first, and then an example of application determining the shape of a magnet is shown. This method is effective for the design of magnetic circuits consisting of several permanent magnets and the determination of the shapes of magnets.</p> No potential conflict of interest relevant to this article was reported.