| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a core wherein heat dissipation efficiency from a lower beam section can be improved. <P>SOLUTION: In case when a lower beam section 11, an upper beam section 12, a main leg section 13, and a side leg section 14 are included and it is assumed that the plane area of the lower beam section 11 is P<SB>L</SB>, the plane area of the upper beam section 12 is P<SB>U</SB>, the cross section of the lower beam section 11 is S<SB>L</SB>and that of the upper beam section 12 is S<SB>U</SB>, respectively, the relationships of P<SB>L</SB>>P<SB>U</SB>and S<SB>L</SB><S<SB>U</SB>are satisfied. Thus, since the density of magnetic flux of the upper beam section 12 with low heat dissipation becomes low, the calorific value of the upper beam section 12 can be made small. In addition, the plane area S<SB>L</SB>of the lower beam section 11 is made larger to that S<SB>U</SB>of the upper beam section 12, so that an contact area between the lower beam section 11 and a base plate is enlarged, improving the heat dissipation efficiency. Thus, the entire core can display high heat dissipation. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
