| 摘要 |
PROBLEM TO BE SOLVED: To restrain air capacity loss small in a brushless fan motor. SOLUTION: A ball bearing 5 and a stator plate 7 are fixed in a recessed part 3 of a base plate 1 by this motor. A ventilating groove is formed on a side wall 37 of the base plate 1. A plural number of driving coils 9 are arranged on the stator plate 7. A magnet 11 facing against the driving coils 9 is arranged on a rotor plate 13. A plural number of vanes 15 are projectively provided from an outer periphery of the rotor plate 13, and a rotor shaft 19 is projectively provided from a rotational central part and axially supported on the ball bearing 5. A cover 23 having a bleeder 21 of a smaller diameter than a rotating locus on an outer peripheral head end of the vanes 15 is applied on the base plate 1. Each of the vanes 15 has a shape of bulging a roughly middle part of it, an edge side 39 on the side facing against an inner bottom of the recessed part 3 of the base plate 1 is flattened, an edge side on the side of the cover 23 is extended from the bleeder 21 to an outer surface of the cover 23 and a cutout part is provided on a part overlapped with the cover 23. |
