| 摘要 |
<p>PROBLEM TO BE SOLVED: To save the number of parts of a control circuit and to reduce the area of a PC board on which the parts are mounted. SOLUTION: In an axial flow fan motor formed such that a shaft 6 is rotatably supported by means of bearings 4 and 5 and an impeller 9 is attached on a shaft 6, an area is formed in an arcuate state being 30-60% of the whole circle of a boss part 10 and a control circuit is incorporated in a PC board 15 having diameter lower than the diameter of the boss part 10. Further, by utilizing a function mounted on the integrated circuit of the control circuit, parts heretofore mounted are eliminated. A space approximately equal to the area of the PC board 15 is formed in a casing 1 to improve cooling ability, and the number of parts is reduced to reduce the number of manufacturing processes.</p> |
