| 摘要 |
PURPOSE:To improve the cooling efficiency by a method wherein a cooling duct is constituted in such a manner that it has a zigzag-formed path, thereby enabling to let a cooling medium to uniformly flow into the cooling duct. CONSTITUTION:A duct plate 14 is formed on the plate 1a such as a silicon steel plate or an iron plate and the like by arranging the duct piece 13 consisting of along and narrow insulating member in zigzag form. A cooling duct plate 16, having a core window 15, is formed by assembling said duct plate 14, and a cooling duct part 17 is formed by incorporating the cooling duct plate 16 into an iron core 18. A coil 8 is wound around the iron core 18,and the coil 8 is connected to a bushing 9 using the connecting wire 9a consisting of a coil 18. A blowout hole 20 for the cooling medium is provided on a cooling pipe 19 provided on the iron core 18. When the cooling medium is blown out from the cooling pipe 19 and the blowout hole 20, the cooling medium flows into the cooling duct 20 as shown by the arrow 21 in the diagram, it runs in a zigzag-formed path as shown by the arrow in the diagram and runs out from the lower side as shown by the arrow 23, thereby enabling to improve the cooling efficiency.
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