| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress the losses by reducing DC resistance of a coil. SOLUTION: A holder 12 of an insulating material which holds first and second secondary coils 8 and 10 around a core 4 is provided, and the holder 12, forming a gap 12A in between a hole 14 in which the core 4 is inserted, an inner wall part 16 surrounding the core 4, and an inner wall part 16 comprises an outer wall part 18 which surrounds the inner wall part 16. The first and second secondary coils 8 and 10 are formed into a single layer, respectively, and the first secondary coil 8 is smaller than the secondary coil 10 in diameter, while the first and second secondary coils 8 and 10 are housed in the gap 12A of the holder 12 with the first secondary coil 8 provided inside the second secondary coil 10. The inside surface of the first secondary coil 8 makes contact with the outer surface of the inner wall part 16 of the holder 12, which the outer surface of the second secondary coil 1 makes contact the inner surface of the outer wall part 18 of the holder 12, and a gap is formed between the outer surface of the first secondary coil 8 and the inner surface of the second secondary coil 10.</p> |
