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Some Issues for Magnet Assemblies Manufacturing

Stanford Magnets has the capability of manufacturing high quality magnet assemblies of different structures. The follow are the points that should be considered and performed with care during magnets assembling.

Housing Design

Stanford Magnets is equipped with several state-of-art technologies for complex housings manufacturing. For housing designs the most important step is to support and locate magnets in precise positions. Therefore effective locating section must be applied.

Magnets Affixing to the Housing

Magnets are affixed to the housing by effective adhesives. High rating temperature and fast curing are the two most important factors for adhesive selection. Fast curing avoids the need of fixtures to hold the magnets in place while the bond cures. Cyanoacrylate adhesives with temperature rating up to 350°F (about 177°C) are preferred. If magnet assemblies are targeted to be used in a vacuum, potential out-gassing of the adhesives should be considered.

Mechanical Fastening

Rare-earth materials are extremely powerful, and when in repulsion and if the adhesives break down, they can behave as projectiles, which may cause severe damage and hurt. Therefore, if magnets arrays are required, especially when the magnets are placed in repelling positions, safety issues must not be ignored. We strongly recommend that in this case mechanical fastening be included in the design together with adhesives. Potential methods of mechanical fastening include encasement, pinning and strapping the magnets in place with non-magnetic metal components. Customized solutions can also be met at Stanford Magnets.

Potting

Magnet assemblies may be potted with compounds to fill gaps or to cover entire magnet arrays. Potting compounds can cure into hard and durable finishes, and are able to resist a variety of environmental conditions such as elevated temperatures and water flow, etc.. When cured, the potting compounds can be machined to provide accurate finishing parts.

Welding

Assemblies that are required to be hermetically sealed can be welded using either laser welding (which is not affected by the presence of magnetic fields) or TIG welding (using appropriate shunting elements to reduce the effect of magnetic fields on the weld arc). Special care should be taken to eliminate the influence of heat dissipation on magnets when welding assemblies.