Magnets are objects or pieces of material that generate a magnetic field that is either natural or forced. A magnetic field is moving electrical charges that repel or attract one another. Size, strength, shape, and materials all differ in the make up of magnets, making each one unique to serve an exact purpose. Magnets are used in the industrial, medical, dental, and many other industries as well as in the home and workplace. There are four basic types of magnets, permanent, temporary, electromagnets, and superconductors.
Permanent magnets are the most commonly used magnets around. These can be found on refrigerators, white boards to hold notes, in speakers, compasses and more, and are usually made out of neodymium iron boron, samarium cobalt, alnico, ceramic or ferrite.
Temporary magnets are objects that perform like permanent magnets, but only when they are in range of a powerful magnetic field. Objects that are temporary magnets include paper clips, bobby pins, nails and screws, and needles. When these magnets are removed from the magnetic field, their magnetism is gone. Temporary magnets can be found in electric motors and telephones.
Electromagnets work by the flow of electric current producing the magnetic fields and are made up of tightly wound coil of wire. To maintain the magnetic field there must be a continuous supply of electrical energy, but the supply can easily be turned off and on as needed. Magnets of this type can be found in use in items like televisions, radios, and computers.
Superconductors are also composed of wire coils of special
metal alloys without a metal core. When cooled below a critical temperature,
the metal alloys become superconductors. This process is conducted through
Magnetic Resonance Imaging machines, mass separation processes and more. Out of
all magnets, superconductors are the strongest.
Magnets can largely be broken up into two categories: non-permanent and permanent; non-permanent magnets are electromagnets which require an external source of power and are triggered electrically to be magnetic. Electromagnets have many industrial applications such as solenoid valves, AC and DC motors, biomagnetic separation, transformers and so on. Permanent magnets include ceramic magnets (also known as ferrite magnets), alnico magnets and rare earth magnets. For instance, ceramic magnets have lower magnetic power and are more brittle and easily breakable than some other magnets, but they are much more cost-effective and are used in non-structural applications in motors, magnetic chucks and magnetic tools. Rare earth magnets, on the other hand, are less cost-effective to manufacture but are far more powerful and retain their magnetism better than ferrite magnets; they are used as industrial magnets for holding and lifting, motors, speakers and sensors, testing and MRIs.
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- A shorthand reference to magnets made from an aluminum nickel cobalt compound; these types of magnets have medium to high magnetic strength and have excellent magnetic resistance to heat.
- Encased magnet used to hold identification badges to clothing without causing damage.
- An electromagnet design in which the magnetic coil is located between two steel plates parallel to each other, which act as the north and south poles.
- Magnet assemblies composed of strontium carbonate and iron oxide that are charcoal in color and typically appear in the forms of discs, rings, blocks, cylinders and even arcs for motors.
- The temperature at which point the magnetic properties of a magnet begin to decrease upon exposure.
- A device that can eliminate magnetism in magnetic assemblies by using an alternating electrical current.
- Forces like temperature, shock, vibration or electrical or magnetic currents that completely or partially demagnetize magnetic material.
- A commonly used, low-cost magnet that is very brittle though relatively hard and has good resistance to demagnetization, good temperature stability and excellent corrosion resistance.
- A material containing iron, making it inherently magnetically attracted.
- A magnet made by combining a mixture of ferrite powder and rubber polymer resin, forming it by extrusion or rollers, then magnetizing and laminating it with vinyl or adhesive. Flexible magnets are the most pliable permanent magnet and are the least expensive by volume.
- The measure of strength of the total size of a given magnetic field found in magnetic assemblies.
- Unit of measurement indicating magnetic induction.
- A magnet that is optimal for any big projects in which large metal products without brackets need to be lifted. Industrial magnets are adaptable enough to give companies the flexibility to customize them in order to make them better and more efficient for specific applications.
characteristic whereby magnetic orientation toward a specific direction
does not exist. Isotropic, or non-oriented,
magnets can be magnetized in all directions.
- A magnet that is part of a lifting device used to move a variety of ferrous metals, ranging from small bundles of rod or scrap to large, heavy blocks.
- An area characterized by the movement of an electric charge. Magnetic fields remain most intense at opposite ends of magnets, known as the North and South poles.
- The strength of the magnetic field of a magnet exemplified by the rate of movement of magnetic energy.
- The initial magnetization of an object created by forces emanating from a magnetic field.
- The direction toward which a magnet is predisposed as a result of exposure to a magnetic field during production.
- Area of magnetic flux concentration where magnetic fields are strongest. The North and South Poles are magnetic poles.
- Devices that remove ferrous metals from various materials, while protecting machinery.
- Unit of measurement indicating magnetic flux.
- A magnet made of a rare earth element that is smaller, stronger and cheaper than most other magnets.
- Unit of measurement indicating the strength of a magnetic field.
- A magnet that after having been removed from a magnetic field still retains its magnetism.
- A device that picks up all metal debris when rolled over spills. A release lever drops everything the rotary magnetic sweeper picks up, eliminating the need to handle potentially hazardous metal pieces.