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The main role of the relay coil

What is the main role of the relay coil? We should all know the role of the relay. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect, and the armature will overcome the pulling force of the return spring under the action of electromagnetic force attraction. To the iron core, the moving contact that drives the armature attracts the static contact (normally open contact). The role of the coil is to make the upper coil charged by the input voltage to attract or bounce off the relevant contact points to achieve the function of mechanically opening/breaking another group of circuits to achieve the desired output, so the coil is the main component of the relay. To convert electrical energy into mechanical energy to achieve control.

A relay is a device often used as a switch in a circuit. According to the type of control voltage required by its coil, it can be divided into AC relay and DC relay. The specification of the relay is expressed by the coil control voltage and the contact current. Usually, the load current is less than 10A, and the contact of the relay can be used to directly turn on or off the circuit. If the load current is too large, it can be used as an indirect control device.

In the central air conditioning control system, relays are often used as switches for power circuits such as compressors, fan motors, water pumps, and four-way valves. When in use, one end of the relay control coil is connected to the power supply, and the other end is connected to the output end of the control component. Through the output control signal of the control component, a potential difference is generated at both ends of the relay control coil and a current loop is formed to generate electromagnetic force. Under the action of electromagnetic force and the inherent elastic force of the relay reed, the relay contacts are attracted or released, thereby turning on or off the circuit of the electrical load power of the electrical appliance to control the operation or stop of related equipment.

The main function of the relay coil: the use of electromagnetic principles to realize the conversion of electrical energy into mechanical energy to achieve control. The coil and the armature inserted in the coil form an electromagnet. The magnetic force generated by the energization of the coil will cause the armature to move mechanically and drive the contact to complete the connection. Turn on or off the circuit to achieve the desired output, so the coil is the main component of the relay. Because there is little current through the coil, and the current or voltage controlled by the contact is higher. The purpose of controlling large current and high voltage.

When the relay coil is de-energized, the electromagnetic suction will disappear, and the armature will return to the original position under the reaction force of the spring, so that the moving contact and the original static contact (normally closed contact) are attracted. This pulls in and releases, thus achieving the purpose of turning on and off in the circuit. The "normally open, normally closed" contacts of the relay can be distinguished in this way: the static contacts that are in the off state when the relay coil is not energized are called "normally open contacts"; the static contacts in the on state are called It is "normally closed contact".

We all know the role of relays and coils. In simple terms, relay coils are an important part of relays. Both the coils of the relays need to be adsorbed and bounced. The relays must be used in conjunction with the coils in order to function.

Knkong Electric

Date:2019-09-05 11:05

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