De-Magnetising
& Magnetising
Magnetic materials can become magnetised in all sorts of situations. The Diverse Zeromag is the world famous product for solving magnetic arc blow. Diverse also provide a general degaussing service.
During World War II many of the mines laid at sea had magnetic triggers. To overcome this for minesweepers, the whole hull of the vessel would be degaussed. This was achieved by winding coils of wire around the vessel and taking an ac current from a maximum value, which caused magnetic saturation in the material, slowly down to a minimum level leaving the hull demagnetized.
This same idea can be used in today’s industrial environment to demagnetize steel parts or even complete machines and assemblies. Unfortunately there can be complications. First, the nature of the materials used needs to be properly understood. A complex machine is built with a variety of different materials some of which will be magnetic. If the magnetic materials are in the same magnetic circuit, then the field strength will hit the saturation plateau of the first to saturate, which will in turn require a much higher field strength to make the other materials saturate.
The complexity of the geometry also needs to be considered. With a variety of potential magnetic paths, parts of the magnetic circuit can be bypassed and consequently become very difficult to demagnetize.
In some instances it is necessary to fully characterise the materials for their magnetic properties. This information can then be used to set the saturation field, and set the key points in the demagnetisation sequence.
Zeromag is one key tool that can be used for this process. Its fast reaction time and high current capability mean that demagnetisation can be accomplished quickly and efficiently.
Please call to discuss your practical degauss issues.
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