广州3TD40021XC4西门子接触器报价 3TB42220XU0
价格:10.00起
广东泓威电气设备有限公司
联系人:林小凤
电话:15918438407
地址:广东省广州市广深大道5号盈丰中心302
直流电流与交流电流相比较,不存在周期性的电流数值过零点,因此,传统接触器开断电路时,触头之间产生的电弧较为强烈,燃弧时间也比较长,以便充分释放电路中剩余的能量。电弧的燃烧产生高温和强光,对触头表面有严重的烧蚀作用,触头材料在多次开断之后逐渐流失,触头电磨损严重时,导致直流接触器报废,不能开断电路。 [1]
电力电子技术得以迅猛发展,人们将电力电子元件应用到直流接触器中,巧妙的创造出一种混合式直流接触器,使得直流接触器向智能化、可控化迈进了新的一步。这种混合式接触器利用传统直流接触器在闭合导通状态下触头接触电阻小、导通压降小的优点,将由反并联晶闸管和控制模块单元共同组成的无触点开关并联在传统直流接触器触头上。这种无触点的电力电子开关分断电路时不产生电弧,这就避免了传统接触器中电弧对触头材料的电磨损,也就大大增加了触头的使用寿命和可靠性。 [1]
直流接触器永磁机构
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直流接触器作为应用广泛的电气开关之一,其生产和需求数量巨大,在正常使用过程中,电磁铁线圈一直通电工作,产生电磁吸力,保证铁芯和衔铁吸合,带动动、静触头闭合,接通电路。在上述过程中,线圈本身存在电阻,持续消耗电能,这是直流接触器主要的使用成本之一,浪费了大量的能源和财产,因此,如何降低直流接触器的工作耗能,是研究直流接触器的关键点和重难点。直流接触器永磁操动机构是一种在传统直流接触器电磁操动机构基础上发展而来,将电磁操动机构和永磁铁相结合的混合型操动机构,不单单使用原有的电磁吸力和弹簧反力作为铁心吸合与分离的动力,而是加入了永磁铁对铁心的吸引力,采用储能电容充放电提供合闸、分闸电力,通常称之为“电磁操动,永磁保持,电子控制”。在分、合闸运动过程中,电磁吸力,永磁吸力与弹簧作用力共同作用,在稳定工作过程中,采用永磁吸力代替之前的电磁吸力,保持衔铁与铁芯心的吸合状态。一则,永磁操动机构大量节约了保持线圈的电能消耗,环保节能。二则,永磁体保持吸合与电磁吸合相比,噪音低,无污染。三则,永磁操动机构剔除了电磁机构中一系列复杂繁琐锁扣保护装置,大大提高了接触器操动机构的工作可靠性,降低了生产工序和成本,减小了接触器的体积。 [1]
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半导体接触器:半导体接触器是一种通过改变电路回路的导通状态和断路状态而完成电流操作的接触器。
永磁接触器:永磁交流接触器是利用磁较的同性相斥、相吸的原理,用永磁驱动机构取代传统的电磁铁驱动机构而形成的一种微功耗接触器。
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