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Magnet Features

Electromagnetic locks are designed to take advantage of the physics behind electromagnetism. An electromagnetic lock comprises two main parts, an armature plate made of a magnetic material and a metal plate surrounded by a coil of wire which can be magnetized. When current is passed though the coil, the metal plate becomes magnetized and strongly attracts the armature, locking the door.

Electromagnetic locks are high performance. For example, our 10010 series of electromagnetic locks, with a maximum holding force of 540kg ( 1200lbs ), only use 0.6W of power to produce up 240kg ( 530lbs ) of holding force.

The holding force capability of each of our electromagnetic locks is tested in a collinear load test . The electromagnetic lock is loaded in a rig with power being supplied so that the electromagnet strongly attracts the armature plate. Then force is slowly applied to try to separate the armature plate. Eventually the mechanical pulling force will overcome the magnetic force and allows us to rate the strength of our electromagnets.

This figure shows the relationship between voltage and holding strength. Voltage is proportional to power consumption when the current is fixed. Holding force is proportional to voltage until holding force reaches a maximum. At this point, further increasing power consumption will not increase holding strength.

Electromagnetic locks are protected by a layer of epoxy potting compound which ensure a long life for the lock. The lock itself is strong and rigid. All the advantages of electromagnetic locks have made them very popular, becoming the most widely installed type of electric lock used by security engineers.

Electromagnetic locks use magnetic force and do not require a mechanical bolt to remain locked. This makes them very suitable for emergency and fire exits. In case of an emergency, electromagnetic locks can be made to automatically open, with no concerns over the door not being able to open due to mechanical failure.