Many people in the world are familiar with the use of magnets in our daily life. However, much bigger and stronger industrial magnets also used every day in a variety of industrial applications. Some of the widely used ones are: bulk magnetic materials, magnetic sweepers, magnetic lifts, magnetic sheet handlers and permanent electromagnets. Magnets are made from a variety of materials such as: femerite, iron, chromium cobalt, aluminum cobalt, ceramic, cast and sintered alnico, samarium cobalt, neodymium iron boron, rare earth materials, ferrite/soft ferrite, formed chrome, garnet, and dielectric or powdered iron. Neodymium is used in most heavy-duty industrial magnets as it can produces smaller, stronger, and less expensive magnets.
The most basic types of magnets are permanent magnets, temporary magnets, and electromagnets.
Permanent magnets are made to hold their magnetic properties for as long as possible while temporary magnets will lose their power over time or when they are placed outside of a magnetic field. Electromagnets are designed to support a charge which allows the magnetic powers to be turned on and off. The force field is created by a copper wire that is coiled around an object. The magnet gets stronger as the current is increased. This type of industrial magnet is ideal for lifting and transferring large magnetic loads.
Industrial magnets can basically come in any size and shape. They can be very thin and flexible or thick and firm. The thinner the material, the less the lifting power. A smooth surface will generally offer twice the effect of a rough-cast finish.
While choosing an industrial grade magnet, some important factors need to be kept in mind such as their strength and their holding capabilities. Various grades of industrial magnets range in strength and holding capabilities. Low carbon stock generally offers the highest lifting strength, while cast iron provides about 70 percent by comparison. The holding capability of the magnet is also dependent on the surface conditions, vibration, friction and other factors. These magnets can be available in a variety of shapes such as: sheet, U-shaped, powder, ring, pot and sphere. Some other factors that also need to be considered are the thickness and length of the magnets.