What is the working principle of the contactor coil?

This article introduces the working principle of the contactor coil. First of all, the concept of the contactor is divided into AC contactor (voltage AC) and DC contactor (voltage DC), which is applied to power, distribution and power. The contactor refers broadly to an electrical appliance that uses a current flowing through a coil to generate a magnetic field in an industrial power to close the contacts to achieve a controlled load.

In electrical engineering, it is often used for electric motors as a control object because it can quickly cut off the AC and DC main circuits and devices that can be frequently switched on with high current control (some types up to 800 amps). Used to control electrical loads such as plant equipment, electric heaters, working machines, and various power units. The contactor not only turns the circuit on and off, but also has a low voltage release protection. The contactor has a large control capacity and is suitable for frequent operation and remote control. It is one of the important components in the automatic control system.

In industrial electrical, there are many types of contactors, and the current varies from 5A to 1000A, and its use is quite extensive.

The working principle of the contactor coil is: when the contactor coil is energized, the coil current generates a magnetic field, and the generated magnetic field causes the static iron core to generate electromagnetic attraction to attract the moving iron core, and drives the AC contactor to move, the normally closed contact is disconnected, and the normally open The contacts are closed and the two are linked. When the coil is de-energized, the electromagnetic attraction disappears and the armature is released under the action of the release spring, the contact is restored, the normally open contact is opened, and the normally closed contact is closed. The working principle of the DC contactor is somewhat similar to the principle of the temperature switch.