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    MDX61B0014-5A3-4-00
    发布者:gw0002  发布时间:2024-01-12 15:42:18  访问次数:

    MDX61B0014-5A3-4-00  

    MDX61B0014-5A3-4-00 防爆伺服电机在什么环境下起作用?

    处于 I类环境(UL名称)中的电机,其中存在易燃气体、蒸汽或液体,旨在防止内部火花或火焰从伺服电机逸出到危险环境中。它们的设计也使电机外壳温度不超过存在气体、蒸汽或液体环境的安全温度。

    在 II类或 III类环境(UL名称)中存在某些灰尘或纤维的电机设计为电机外壳温度不会超过可燃灰尘和纤维环境的安全温度。虽然简单地以较低的额定电流运行电机会减少它产生的热量,但其他限制电机外壳温度过高情况的故障安全方法包括在电机达到临界温度之前断开电机电源的恒温器。

    其他技术用于在这些环境中运行的其他设备,其中一些也可用于电机,包括吹扫或加压、额外的防爆外壳、封装,甚至充液设计。无论采用何种技术,目标都是防止电机在正常运行条件下或电机故障时点燃易燃源。

    我怎么知道伺服电机是否防爆?

    当火花点燃电机内部的挥发性气体时,防爆设计包含内部燃烧,以防止更大的爆炸或火灾。防爆伺服电机上清楚地标有铭牌,标识其是否适合给定的危险环境。

    根据认证电机的机构,铭牌将清楚地显示电机适用的危险位置类别、划分和组。能够认证电机是否适用于危险用途的机构有UL(美国)、ATEX(欧盟)和CCC(中国)。这些机构将危险环境划分为不同的类别——定义了环境中可能存在的危险;分部-确定在正常运行条件下存在危险的可能性;和组-标识当前的特定材料。

    UL标准将危险分为三类:易燃气体、蒸气或液体(I类)、可燃粉尘(II类)或可燃纤维(III类)。第 1部分表示在正常操作条件下存在危险材料,而第 2部分表示在正常条件下不可能存在材料。集团将具体标识存在的危险材料,例如乙炔 (A)、氢气 (B)、乙烯 (C)或丙烷 (D)等常见的 I类材料。

    欧盟也有类似的认证要求,将环境分为不同的区域。区域0、1和2用于气体和蒸汽,而区域20、21和22用于灰尘和纤维。区域编号表示正常运行期间材料存在的概率,区域0和20处于非常高的水平,区域1和21处于较高水平和正常水平,2区和22区处于较低水平。


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