| 摘要 |
PURPOSE: To provide a device for preventing interfering radio wave from being generated at a contact between the commutator and brush of a direct current motor by a method wherein a radio wave interference source or an object which transmits radio waves and its vicinity are insulated and covered with an aluminum foil or an aluminum plate to form a transformer and an electric cord. CONSTITUTION: (a):An input coil 1 is insulated by an insulator 2, an aluminum plate 3 or an aluminum foil is wound thereon and insulated by an insulator 4, an output coil 5 is wound thereon and insulated by an insulator 6, and the insulator 6 is surrounded with an aluminum plate 7 for the formation of a transformer 8. (b): An electric cord is covered with an aluminum foil 11, a bare wire is wound in a spiral on the aluminum foil 11, and the bare wire is coated with a vinyl film into a cord 10. |
