Wellcome to　Kojimag！

What is "Kojimag" ?

Kojimag is the site which explain the theory of the magnetic field come from magnet, and provide how the magnetic field could be calculated based on the idea of charge model. Also provide the simple software which can simulate the magnetic field comes from magnet , force acting on the magnet , demagnetization caused by magnet heating and so on. Mainly based on rare earth magnet such as Neodimium magnet. Also provide the theory how to calculate the magnetic field made by electric steady current. Those idea is based on charge model so calculation program is simple and fast. So the software Kojimag could calculate those magnetic field and so on in very short time, and that result is based on the theoretical equation, it's much easier compared with finite element method. So it will be helpful when it having some doubt in the result of finite element method. Here we will explain the foundation of the theory of this charge model. Also in the application part we will be explain how to programming this model.

1.Display on the WEB

In this site many part is described using mathmatization. The method how to display equations by Web is MathML. MathhML is supported only by browser "Firefox"

　　　 Please use Firefox as browser
　　　　Showing respect for the browser "FireFox” which only support MathML

　　　 Also for Mobile, please use Firefox(iOS, or Android)
　　　 whitch also can support MathML.

Please take note that install mathmatic font is also required.
You can check whether your brouser setting is correct or not by this web site. This site is developped so as to display under "FireFox" . If any you can contact author Kojima in the below.

2．DownLoad

Here publishing the magnetic field calculation sheet by Excel.

　1)Calculation sheet of one prism magnet ⇒FieldCalOnePrismMagnet.xls　　

　2)Calculation sheet of several prism magnet ⇒FieldCalSeveralPrismMagnet.xls　　

　3)Calculation sheet of holed cylindrical magnet(Magnetized Z direction) ⇒FieldCalHoledCylindrMagnet(Zdir).xls　　

　4)Calculation sheet of holed cylindrical magnet(Magnetized Diameter direction) ⇒FieldCalHoledCylindrMagnet(Dia).xls　

　6)Calculation sheet of sector magnet　

3．Update history

4．Schedule

Software Kojimag publishing　Jun2016

Update slowly please expect.

5．Reference(Kojimag Foundation)

Reference Book

1)　Mathmatic Formula I(Iwanami Book)

2)　Foundation of ElectroMagnetic Theory

3)　Design and application for magnet curcuit/ Yamakawa Kazuo, OKawa Kokichi, Miyamoto Yoshinobu

4)　Electro Magnetic training / Shimoda Koichi, Chikazumi, Soushin, Nishikawa Tetsuharu, Hirakawa Hiromasa

Reference WEB Page

1)　How to make MathML Web site