| 摘要 |
PURPOSE:To reduce electric noise by employing a metal disc for a coil holder. CONSTITUTION:A coil holder 2 made of a metallic disc is mounted on a cup- shaped coil 11 formed in a cup shape. A cup-shaped coreless rotor is assembled by forming a notch at the outer end of the holder 2 to form a toothed part 21, at which a flanged cylindrical end 12 formed of crossover track between coils disposed on the cylindrical surface of a cup-shaped coil 11 is interposed. The cylindrical end face may be formed in flange shape by throttling one end of a cylindrical coil. The metallic disc is used for the holder as above, thereby reducing electric noise, eliminating an adsorbing plate and facilitating assembling and manufacturing work. |
