| 摘要 |
A yoke receives an armature and a cooling fan and has air inlet and outlet openings. A water blocking cover substantially covers the inlet and outlet openings of the yoke. The cover includes an intake duct, an exhaust duct and a partitioning member. The air is drawn from outside of the cover into the air inlet openings through the intake duct upon rotation of the fan. The air is discharged from the air outlet openings to the outside of the water blocking cover through the exhaust duct upon the rotation of the fan. The partitioning member is located in a space between the water blocking cover and the yoke and restrains free communication of the air between the intake duct and the exhaust duct through the space between the water blocking cover and the yoke.
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