| 摘要 |
An external rotor for a direct current drive motor, comprising a side wall 1, an end cover 2 disposed at the bottom of the side wall 1, a cavity 3 formed there between, a plurality of openings 4 formed in the side wall 1, a base 5 disposed at the centre of the end cover 2, and a centre hole 7 connected to a transmission shaft of the motor and disposed at the centre of the base 5. The base 5 is connected to the side wall 1 via multiple "V" shaped vane structures 8 separated by air inlets 9. The vanes generate axial airflow and dissipate heat from a motor winding, as the housing rotates in either the forward or reverse direction. A magnetic yoke shell 12 and a plurality of magnetic tiles 6 are received on the side wall 1 (fig 4) notches 13 engaging sidewall step projections 11. Ribs 17,18 reinforce the central aperture 7 which may be a splined insert (figs 4,7) or form by the moulding process. Ribs 15 interconnect the vanes and ribs 16 reinforce the vane structure The vanes connect the side walls 1 and the central portion 5.
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