How to choose relays?

How to choose relays?

Depending on the application, the power you are using and the size and function of the device, you can choose between different types of electromagnetic relays.

To test an electromagnetic relay, you can use a regulated power supply and an ammeter to monitor the voltage and current. When you hear the release sound, you should record the voltage and current and write down these values. The release voltage of a relay is normally between 10% and 50% of the suction voltage. Release voltages below this value can adversely affect the operating capability of the relay, thus reducing the stability and reliability of the circuit.

In the circuit diagram, the movable armature represents the coil of the electromagnetic relay. The contacts are usually normally open or normally closed and the text symbol is located next to each contact. The contacts are represented by a long box or a separate control circuit. When there are two coils, the long boxes should be placed parallel to each other.

Electromagnetic relays generally consist of an iron core and a coil. When voltage is applied to the coil, it produces an electromagnetic effect which attracts the iron armature and closes the static or moving contacts. When the voltage is removed, the coil is de-energised and the armature is returned to its original position by the reaction force of the spring. This is the most common type of electromagnetic relay. Generally speaking, electromagnetic relays can be used to switch between high and low voltage supplies.

The operating time of an electromagnetic relay depends on the type of construction. The inductive cup construction is more effective in generating torque than the shaded pole or meter construction. If the secondary winding does not operate properly, the relay will not function. The operating voltage of the relay should not exceed 1.5 times its operating voltage. Otherwise the coil will burn out. It is vital to check the operating voltage of a relay before using it.

In addition to voltage and current, electromagnetic relays use magnetic flux to generate the operating quantity. The force on the moving element is proportional to its current in the air gap and the square of the flux. If the force is greater than the binding force, the relay operates. This is an ideal example of a non-causal electromagnetic relay. There are many other types of electromagnetic relays.

如何选择继电器？

根据应用、您使用的电力以及设备的尺寸和功能，您可以选择不同类型的电磁继电器。

要测试电磁继电器，您可以使用稳压电源和电流表来监测电压和电流。当您听到释放声音时，您应该记录电压和电流并记下这些值。继电器的释放电压通常为吸合电压的 10% 到 50%。低于此值的释放电压会对继电器的操作能力产生不利影响，从而降低电路的稳定性和可靠性。

在电路图中，可动电枢代表电磁继电器的线圈。触点通常为常开或常闭，文本符号位于每个触点旁边。触点由一个长框或单独的控制电路表示。当有两个线圈时，长箱应相互平行放置。

电磁继电器一般由铁芯和线圈组成。当向线圈施加电压时，它会产生电磁效应，吸引铁电枢并闭合静态或移动触点。去掉电压后，线圈断电，衔铁在弹簧的反作用力作用下回到原来的位置。这是最常见的电磁继电器类型。一般来说，电磁继电器可用于切换高低压电源。

电磁继电器的动作时间取决于结构类型。与罩极或电度表结构相比，感应杯结构在产生扭矩方面更有效。如果次级绕组不能正常工作，继电器将不起作用。继电器的工作电压不超过其工作电压的1.5倍。否则会烧坏线圈。在使用继电器之前检查继电器的工作电压至关重要。

除了电压和电流之外，电磁继电器还使用磁通量来产生操作量。运动元件上的力与其在气隙中的电流和通量的平方成正比。如果力大于约束力，则继电器动作。这是非因果电磁继电器的理想示例。还有许多其他类型的电磁继电器。