Domestically Sourced RARE EARTH MAGNETS FOR sUAS

The US Army is seeking domestically sourced rare earth magnets for small Unmanned Aerial Systems (sUAS). The magnets should have specific properties, such as a maximum energy product (BH)max of 49-53 MGOe, remanence (Br) of 1.42 - 1.48 Tesla, and intrinsic coercivity (Hcj) of >19 kOe. The magnets will be used in motors, with 14 magnets per motor, and the army is planning to manufacture 480,000 motors. The demand forecast for each motor is: 320,000 of the 2807’s, 80,000 of the 3115’s, and 80,000 of the 2407’s. • The magnets should be able to operate at temperatures up to 90 deg C. • The magnets should have a reversible loss of magnetic field strength (Br) of not more than -0.14% / deg C. • The coating is required for corrosion resistance, and alternate coatings may be proposed if they are compatible with mounting adhesives such as epoxy. • The pole orientation of the magnets should be centered in the arc segment in the radial direction.