Use of Magnets

Permanent magnet applications in general can be divided into four categories, as follows:

CATEGORY 1
Applications that make use of the tractive and/or repelling force of the magnet, i.e., the attraction between a magnet and a soft magnetic material, such as a piece of iron or steel, or the attraction or repulsion between two magnets, is used to do mechanical work. The following applications are in this category:

Magnetic separators, magnetic holding devices, such as magnetic latches.
Magnetic torque drives
Magnetic bearing devices

Use of Magnets

Use of Magnets

CATEGORY 2
Applications that make use of the magnetic field of the magnet to convert mechanical energy to electrical energy. Some of these applications are:

Magnetos
Generators and alternators
Eddy current brakes (used widely for watt-hour meter damping). (This application could be listed under electrical to mechanical energy conversion; but as mechanical energy is used to create the eddy currents, it will be discussed with this group.)

CATEGORY 3
Applications that make use of the magnetic field of the magnet to convert electrical energy to mechanical energy. Some of these applications are:

Motors
Meters
Loudspeakers
Relays
Actuators, linear, and rotational

CATEGORY 4
Applications that use the magnetic field of the magnet to direct, shape and control electron or ion beams. Some of these applications follow:

Magnetic focused cathode-ray tubes
Traveling Wave Tubes
Magnetrons, BWO, Klystrons
Ion Pumps
Cyclotrons