| 摘要 |
PROBLEM TO BE SOLVED: To improve cooling and heat radiation performance of a coil 7 by increasing the cooling surface area thereof. SOLUTION: A groove 8 is provided in the axial direction to the projected areas 3a, 3b of end plates 3 located at both end surfaces of a core 2, and the heat radiating surfaces 9 consisting of the coil 7 wound to a slot are provided at both walls of the groove 8.
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