P20/15 DC12V Electric Sucker Electromagnet 3KG

This DC 12V KK-P20/15 2.5KG Lifting Solenoid Electromagnet consists of an iron core and a coil to attract magnetic substances, using the magnetic action induced by electric current, only while the current is applied. This compact functional device offers high power with high reliability. The structure and design to release the residual magnetism left after de-energization is also one of its unique features.

Working Principle:

An electromagnet is simply a coil of wire.  It is usually wound around an iron core.  However, it could be wound around an air core, in which case it is called a solenoid.  When connected to a DC voltage or current source, the electromagnet becomes energized, creating a magnetic field just like a permanent magnet.   The magnetic flux density is proportional to the magnitude of the current flowing in the wire of the electromagnet.

The polarity of the electromagnet is determined by the direction of the current.  The north pole of the electromagnet is determined by using your right hand.  Wrap your fingers around the coil in the same direction as the current is flowing (conventional current flows from + to -).  The direction your thumb is pointing in the direction of the magnetic field so north would come out of the electromagnet in the direction of your thumb.  DC electromagnets are principally used to pick up or hold objects