The permanent magnetic lifter is an advanced lifting equipment, which works on the principle of electromagnetic induction. It can lift metallic heavy objects, for example, to lift heavy steel plates in steel factories. There is a breakaway force, indicating the maximum force required to detach the magnetic lifter from the surface of its load. What is this standard value of the breakaway force? How to measure it?

Before leaving the factory, all new magnetic lifters should have a breakaway force test by QA team. Factories would have advanced testing machines to conduct the test. During the test, the testing machine continually applies more and more pull force to the magnetic lifter, until it completely breaks away from surface of the metallic foundation bed. At this time, the pull force recorded by the testing machine is the breakaway force of this magnetic lifter.

Normally, the breakaway force of an excellent permanent magnet lifter should be 3.5 times its rated capacity. This means that if the rated capacity of the permanent magnet lifter is 2 tons, then it must have the ability to lift at most 7 tons. Of course, this is an ideal value, which would be affected by the surface, material, air gap and shape of the metallic objects. Under the qualification standards for permanent magnetic lifters, they can’t be used to lift objectives that are heavier than the rated capacity.