自动门
自动门:电磁式继电器
发布时间:2014/1/9
自动门讯:
电磁式继电器。电磁式继电器是应用最早也最多的继电器。按其输入信号性质可
分为电流、电压继电器和中间继电器三种。
    a.电流继电器。电流继电器的线圈与被测电路串联,按照电路中电流变化而动作,
其线圈匝数少、导线粗、阻抗小,常用于按电流原则进行控制的场合。按电流继电器的动
作电流特点可分为欠电流、过流两种。
    b.电压继电器。电压继电器的线圈与被测电路并联。其线圈匝数多、线径细、阻抗
大。电压继电器根据所接电路电压值的变化而处于吸合或释故状态,按其动作电压特点又
有过电压、欠电压和零电压三种。过电压继电器在电压正常时释放,当发生过电压(1.1
~1. 5UN)时吸合。欠电压、零电压继电器则在电路电压正常时吸合,当发生欠电压
(0. 4~0. 7UN)或零电压(0. 05~0. 25UN)时释放。
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