▲技术参数说明：9905-973  WOODWARD 8通道伺服继电器

  就是将原来使用的8个单独的继电器，通过一定得技术手段集成到一个整体中，作为一个模块，通过相应的接线发挥原来的8个继电器的功能，省却了继电器之间的联线。

继电器工作原理

继电器工作时，电磁铁通电，把衔铁吸下来使D和E接触，工作电路闭合。电磁铁断电时失去磁性，弹簧把衔铁拉起来，切断工作电路。因此，继电器就是利用电磁铁控制工作电路通断的开关。

用继电器控制电路的好处:用低电压控制高电压;远距离控制;自动控制。继电器是─种靠电磁感应工作的自动化电器开关。

继电器的工作原理和特性

继电器是一种电子控制器件，它具有控制系统(又称输入回路）和被控制系统(又称输出回路)，通常应用于自动控制电路中，它实际上是用较小的电流去控制较大电流的一种“自动开关”。故在电路中起着自动调节、安全保护、转换电路等作用。

电磁式继电器一般由铁芯、线圈、衔铁、触点簧片等组成的。只要在线圈两端加上一定的电压，线圈中就会流过一定的电流，从而产生电磁效应，衔铁就会在电磁力吸引的作用下克服返回弹簧的拉力吸向铁芯，从而带动衔铁的动触点与静触点（常开触点)吸合。当线圈断电后，电磁的吸力也随之消失，衔铁就会在弹簧的反作用力返回原来的位置，使动触点与原来的静触点（常闭触点)吸合。这样吸合、释放，从而达到了在电路中的导通、切断的目的。对于继电器的“常开、常闭”触点，可以这样来区分:继电器线圈未通电时处于断开状态的静触点，称为“常开触点”;处于接通状态的静触点称为“常闭触点”。

Is the original use of 8 separate relays, through a certain technical means integrated into a whole, as a module, through the corresponding wiring to play the function of the original 8 relays, saving the connection between relays.

Working principle of relay

When the relay is working, the electromagnet is energized, and the armature is drawn down to make D and E contact, and the working circuit is closed. When the electromagnet loses its magnetism, the spring pulls the armature up and cuts off the working circuit. Therefore, a relay is a switch that uses an electromagnet to control the working circuit.

Advantages of using relays to control circuits: using low voltage to control high voltage; Remote control; Automatic control. A relay is an automatic electrical switch that works by electromagnetic induction.

The working principle and characteristics of relays

Relay is an electronic control device, it has a control system (also known as the input loop) and the controlled system (also known as the output loop), usually used in automatic control circuit, it is actually a small current to control the larger current of an "automatic switch". Therefore, it plays the role of automatic regulation, safety protection and conversion circuit in the circuit.

Electromagnetic relays are generally composed of iron core, coil, armature, contact reed and so on. As long as a certain voltage is added to both ends of the coil, a certain current will flow through the coil, resulting in an electromagnetic effect, and the armature will overcome the pull of the return spring under the action of electromagnetic force attraction to attract the iron core, thereby driving the moving contact of the armature and the static contact (normally open contact). When the coil is powered off, the electromagnetic suction will also disappear, and the armature will return to the original position in the spring reaction force, so that the moving contact and the original static contact (normally closed contact). This suction, release, so as to achieve the purpose of conduction in the circuit, cut off. For the "normally open, normally closed" contact of the relay, it can be distinguished in this way: the static contact in the disconnected state when the relay coil is not powered on is called "normally open contact"; The static contact in the connected state is called "normally closed contact".

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