| 摘要 |
<p>PURPOSE:To obtain a small and light device by arranging permanent magnets having areas larger than the crosssectional area perpendicular to the axis of a main body part of each core constituting a center core, in a primary coil, and making the end surface of the magnet and the end surface facing the permanent magnet of each core constituting a center core. CONSTITUTION:The directions of magnetic flux generated by permanent magnets 17, 18 are identical, and become opposite to the direction of magnetic flux formed in cores 11-13 when a current is applied to a primary coil 21. The thicknesses of the magnets 17, 18 are equal. The widths of the one sides are set to be a value in the range of 1.5-2.5 times the widths of the one sides of the main body parts of the cores 11-13. The widths of the other sides of the magnets 17, 18 are set equal to the widths of the other sides of the main body parts of the cores 11-13. As a result, the areas of surfaces facing one of the cores 11-13 of the magnets 17, 18 are about 1.7 times in the range of 1.5-2.5 times the crosssectional areas perpendicular to the axis of the main body parts of the cores 11-13.</p> |
