广州3TB39220XD2西门子接触器经销商 3TB40220XG2
更新时间:2024-06-16 浏览数:60
所属行业:
代理
发货地址:广东省广州市增城区
产品数量:9999.00个
价格:面议
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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交流接触器制作为一个整体,外形和性能也在不断提高,但是功能始终不变。
接触器(图4)
接触器(图4)
无论技术的发展到什么程度,普通的交流接触器还是有其重要的地位。
空气式电磁接触器(英文:Magnetic Contactor):主要由接点系统、电磁操动系统、支架、接点和外壳(或底架)组成。
因为交流电磁接触器的线圈一般采用交流电源供电,在接触器激磁之后,通常会有一声高分贝的“咯”的噪音,这也是电磁式接触器的特色。3TH40040XR1
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80年代后,各国研究交流接触器电磁铁的无声和节电,基本的可行方案之一是将交流电源用变压器降压后,再经内部整流器转变成直流电源后供电,但此复杂控制方式并不多见。
真空接触器:真空接触器是接点系统采用真空消磁室的接触器。
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。3TH40220XL2
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