Magnets are used in various fields and for hundreds of applications. They are very useful and their usage depends on the type and shape of the magnet. In fact, you can have them custom made to match your specific applications. But what are the major types of magnets?
Temporary – This type is usually iron and iron alloys that are magnetized using magnetic fields. The only problem is that they lose their magnetic properties gradually and over time, especially when the magnetic field is not present.
Permanent – They are naturally occurring and that retain their magnetic properties over a long period of time. The best examples are alnico and ferrites. Aluminum nickel cobalt alloy falls under alnico whereas ferrites are ceramic like materials made from mixing iron oxides with cobalt, strontium or nickel.
Electromagnets – They are very strong compared to the rest and are made by placing a metal core inside wire coils carrying electrical current. Once the electricity goes through the wire it produces the magnetic field and the core acts as the magnet as the energy flows through. These are used in electric motors, TVs and even computers and other devices.
Magnets are available in a wide range of sizes and shapes. The bigger they are the stronger they may be but this may not always be the case because even smaller sized magnets can be improved to take high strength using specific materials. However, the shape can tell a lot about the side and every shape influences how the magnet will be used. Generally, the shape determines the arrangement of the magnetic field outside the magnet and the strength of the pull. The most common magnet shapes are:
Bar magnets that have power focused on the poles and less on the sides, making this shape the weakest because of the small pole area. The shape is, however commonly used as a compass and refrigerator magnets or even for classroom demonstrations.
Horseshoe magnets are shaped in a U making them stronger because the poles point to the same direction. This is actually the universal shape of magnets and is used to pick metal objects of any size depending on strength of the magnet.
Other shapes that you will find available include sphere, disc, cylinder and ring. Considering that each shape determines the pull strength and possible applications, it is very important that you make, you make the right selection in relation to the application needs you have.
What about shattering magnets?
Shuttering magnet is a fairly new system created to fix formwork in concrete precast. They include the popular neodymium magnets and they have steel box housing and black epoxy material that keeps them from damage. These magnets are ideal for all precast concrete formwork constructions. They will prove functional whether for steel or wood shuttering. The magnets are designed with higher magnetic circuit levels, making offering very strong adhesive force to any given ferrous formwork. They can be customized in different powers and design to match specific requirements.