| 摘要 |
<p>PURPOSE:To provide a field core which permits the communication formation of an insertion hole for a lead wire for supplying electric current and a flange part through hole and facilitates the mounting of an electromagnetic coil. CONSTITUTION:A field core 10 is made of the magnetic material, and is extended toward the axis line from the opened port end, at one opened end, and the extended top end has the first cylindrical core 14 having an inner flange part 12 on the same circumference around the axis line. Further, the second core 18 which is made of the magnetic material and formed to a cylinder shape having the outside diameter smaller than the inside diameter of the first core 14, and permits the fitting between one end part with the inner edge of a through hole 16 formed at the top end of the inner flange part 12 when arranged in the first core 14 is provided. Further, between the first and the second cores 14 and 18, the second core 18 is externally fitted, and a magnetic coil 22 can be installed. Further, at the inner flange part 12, an insertion hole 20 for a lead wire 26 for supplying electric current to the electromagnetic coil 22 is formed, and the insertion hole 20 and the through hole 16 are allowed to communicate.</p> |
