| 摘要 |
An electromagnet for brakes and clutches having outer and inner poles and an electrical coil for magnetizing the poles for engaging the armature of the brake or clutch, in which the armature contact face of the poles is provided with alternate lands and recesses. The lands and recesses may be in a variety of different shapes, including those with straight and circular configurations. The lands are preferably crowned and the recesses may be filled with an abrasive-impregnated material, such as an epoxy, to increase the frictional characteristics of the magnet.
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