* NdFeB magnet
CATEGORY 1
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
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

