| 摘要 |
To improve the cooling of the rotor armature disc of an electromagnetic brake, connecting to an external web by a ring of arms forming ventilation fins, the web bounding with the disc and the portions of fins which connect it to this disc, channels for ventilation air, on one at least of the surface bounding the channels internally, striae or ondulations are provided constituted by ribs extending in directions inclined to the direction of flow of the air in the channels. The ratio between the spacing of the sucessive ribs and the height of these ribs is comprised between 5 and 15.
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