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This is extruded as a sheet and passed over a line of powerful cylindrical permanent magnets. These magnets are arranged in a stack with alternating magnetic poles facing up (N, S, N, S...) on a rotating shaft. This impresses the plastic sheet with the magnetic poles in an alternating line format. No electromagnetism is used to generate the ...
The poles are dark, and pole edges are bright. Magnetic field viewing film is used to show stationary or (less often) slowly changing magnetic fields ; it shows their location and direction. It is a translucent thin flexible sheet, coated with micro-capsules containing nickel flakes suspended in oil. [ 1 ]
Magnetic viewing film showing magnetic poles of a refrigerator magnet. Later, a flexible magnet was developed, composed of a high-coercivity ferrimagnetic or ferromagnetic compound (usually barium ferrite) mixed with a plastic binder, [4] extruded as a sheet.
This design is chosen so that the x components of the magnetic fields from the sheets cancel, and the y components reinforce, so that the field is given by (), where k is the wavenumber of the magnetic sheet given by the spacing between magnetic blocks with the same magnetization vector.
The magnetic path is characterized by poles, locations at equal angles around the rotor at which the magnetic field lines pass from stator to rotor or vice versa. The stator (and rotor) are classified by the number of poles they have. Most arrangements use one field coil per pole.
A plastic magnet is a non-metallic magnet made from an organic polymer. Plastic magnets could be used in computer hardware such as disc drives , as well as in medical devices such as pacemakers and cochlear implants , where the organic material is more likely to be biocompatible than its metallic counterparts.