How exactly does a plunger relay work?

  • Thread starter elegysix
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The plunger is actually moving through the magnetic field, not in it.In summary, relays use a coil to create a magnetic field that causes the armature, or plunger, to move and close the contacts of another circuit. The question is raised about how the AC can cause the plunger to move, considering the AC produces a sinusoidal B field. It is explained that the magnetic flux is acting on the larger end of the plunger, causing it to move through the magnetic field rather than vibrating in it. The composition of the armature is also mentioned as a possible factor in its movement.
  • #1
elegysix
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Hi, I'm new to relays.
As I understand it, there is a coil which creates a magnetic field to cause the armature to move (such as a plunger) and closes the contacts of another circuit. My question is this - how can the AC cause the plunger to move? isn't the AC producing sinusoidal B field, which would cause the plunger to vibrate, not extend?
Or is the armature made of say aluminum where the changing B field always causes repulsion?

thanks
 
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  • #2
The magnetic flux is not acting on the shaft of the plunger, but on the larger end at the end of the shaft.
 

Related to How exactly does a plunger relay work?

1. How does a plunger relay work?

A plunger relay works by using an electromagnet to move a metal plunger or armature, which then opens or closes electrical contacts to allow or interrupt the flow of electricity through the circuit.

2. What is the purpose of a plunger relay?

The purpose of a plunger relay is to control the flow of electricity in a circuit. It can be used to turn on or off electrical devices or to switch between different circuits.

3. How does the electromagnet in a plunger relay function?

The electromagnet in a plunger relay is made up of a coil of wire wrapped around a metal core. When an electrical current is passed through the coil, it creates a magnetic field that attracts the metal plunger or armature, causing it to move.

4. What happens when the plunger in a relay moves?

When the plunger in a relay moves, it either opens or closes the electrical contacts, depending on the design of the relay. This allows electricity to flow through the circuit or interrupts the flow of electricity.

5. How does a plunger relay differ from other types of relays?

A plunger relay differs from other types of relays in the way it uses a metal plunger or armature to physically open and close electrical contacts. Other types of relays may use different mechanisms, such as a rotating arm or a reed switch, to achieve the same function.

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