How does the magnetic starter work?

Components of the

The first thing to consider is the device of the magnetic starter. In fact, the design is not complex and includes a moving and fixed part. To make the information more understandable, consider the design of the device, based on the model of the PME series:

1. Contact springs, which ensure a smooth closure of the contacts when the starter is switched on, and also create the necessary pressing force.
2. Contact bridges.
3. Contact plates.
4. Plastic traverse.
5. Anchor.
6. Winding.
7. W-shaped core part( fixed)
8. Additional contacts.

In addition, the device of the magnetic starter may include shock absorbers, the purpose of which is to soften the impact during the start-up of the device. In the PM12 series, the shock absorbers are identified by the number 8, but more clearly they are shown in the second picture - the construction of the magnetic starter PAE-311( designation "10").

We have told you what the magnetic starter is made of, but it hardly made you understand anything, especially if your level of knowledge is "a teapot in an electrician".To make things right, next we'll look at how the device works.

Scheme of operation

The principle of the magnetic starter is not difficult - when you turn on the power button "Start", the electric current passes through the coil and magnetizes the movable armature. As a result, the armature is attracted to the fixed part and the main contacts are closed. The current flows through the circuit and the motor is switched on. If the power is turned off, the electric current will be lost from the coil and it will be demagnetized. This process will involve the use of a contact spring, which will return the anchor to its original position. The main contacts will open and the circuit will be completely de-energized.

We draw your attention to the fact that instantaneous contact opening will occur not only after deliberate power failure, but also if the voltage in the network drops more than 60% of the nominal value.

Now you know how the magnetic starter works. As you can see, the operation of the device is quite simple. You can see the principle of operation in the video examples below.

. Scope

. Well, the last of the main questions of the article is why a magnetic starter is needed( the photo below shows its appearance).As we said earlier, the purpose of this device is the closure and opening of the circuit, which is characterized by large currents. As a rule, starters are used for remote control of motors operating from 220 or 380 Volts. At home, the use of these devices is possible to create a street lighting system or the inclusion of powerful electricity consumers.

Here we have considered the device of the magnetic starter, its operation principle and purpose. We hope that the information was interesting and useful for you. If suddenly you have any questions, ask them in the comments or a special category - "Question-answer"!

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