| 摘要 |
PURPOSE:To prevent an air flow from the inside to the outside of a drive motor and scatter of contaminants by subjecting a pressure generated by a fan and formed on an outer surface of labyrinth seal, to a gap of labyrinth seal. CONSTITUTION:Slits 16 made in a radial direction, are provided on an outer surface of labyrinth seal which seals between the inside and outside of a driving motor, along the circumference and a groove 18 is provided on a shield plate 11 along the circumference facing the slits 16, and a ring shaped guide plate 19 is so mounted that it covers the groove 18 and a part of an outer surface section of the slits 16 and these form a fan. A pressure of this fan generated in the groove 18 by rotating an outer rotor, is subjected to a gap of labyrinth seal 12, and prevents an air flow from the inside to the outside of the drive motor and scatter of contaminants. |
