| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a differential transformer with a high-precision characteristic by connecting a magnetic core and a drive shaft driving it in the butted state by frictional pressure connection. SOLUTION: A primary coil 21 and a pair of secondary coils 22 are wound on a stainless steel bobbin 20 of a nonmagnetic material, and the coils 21, 22 are covered with a stainless steel case 23 of the same nonmagnetic material. A moving magnetic core 25 is made of a nickel group magnetic material, and it is not applied with a heat treatment such as annealing. A stainless steel drive shaft 26 of a nonmagnetic material is connected to a magnetic core 25 in the butted state by frictional welding.</p> |
