电磁离合器（制动器）是自动化控制的主要元件之一，它具有结构紧凑、控制简单、易于实现远距离操纵和自动控制等优点。当初以机床为主，现遍及办公机械、纺织机械炮装机械、印刷机械、木工机械、渔业机械、矿山机械和轧钢。运输等重型机械，因而其可靠性受到人们的普遍关注。 Electromagnetic clutches (brakes) are one of the main components of automation control. They have the advantages of compact structure, simple control, easy remote control and automatic control. Originally dominated by machine tools, now throughout the office machinery, textile machinery gunning machinery, printing machinery, woodworking machinery, fishing machinery, mining machinery and rolling. Transport and other heavy machinery, so its reliability has been widespread concern.