Permanent magnets
Permanent Magnets are classified based on their composition: Neodymium Iron Boron (NdFeB ), Samarium Cobalt (SmCo),Alnico and Ferrite (also known as ceramic).
Rare earth magnets (NdFeB, SmCo) are stronger, NdFeb magnets is stronger and therefore being used where high energy is required or where the magnet needs to be small and strong. SmCo is being used for higher temperatures. Ceramic magnets are the cheapest and fairly strong, and are used in mass production, quite usually a cost effective solution if possible. Alnico is however, least affected by temperature. You will find more information in our website, or you can contact us for more designated information from Magma engineering Team.
How to ask for RFP and order permanent magnets?
It’s quite common to receive a request for quotation from our customers with a drawing of the requested magnet (and it’s a very good start), but most of the customers are not familiar with some of the elements you will have to consider when ordering permanent magnets. Here are some guidelines:
- Drawing – not requested for small quantities, but always useful. In most cases Magma team will issue another drawing with customer’s information and additional technical requirement, if needed.
- Magnetic properties requirements. Minimum values according to your company R&D or engineering request and sometimes maximum values.
- Quantity required. Please state lot size and period to be consumed.
- The required magnetization state (unmagnetized, fully magnetized etc.).
- Working temperature (humidity, or other information that might affect).
- Certification of magnetic properties.
- Marking and packaging requirements.
- Special requirements: such as plating, coating, or functional testing or more.
- Warning – Ceramic magnets are used for their magnetic characteristics. The end-use application should not rely on them for structural purposes due to low tensile and flexural strength. These materials are very brittle, and they chip and break easily
Standard for permanent magnets:
- MMPA Standard No. 0100-00 Standard Specifications for Permanent Magnet Materials
- ASTM A1054 – 07 Standard Specification for Sintered Ceramic Ferrite Permanent Magnets
- IEC 60404-8-1, Magnetic Materials Part 8: Specifications for individual materials Section 1 – Standard specifications for magnetically hard materials
