Non-exchanged-couple injection moldable hybrid magnet
AssigneeABB Schweiz AG
InventorsElio Alberto Perigo, Darren D. Tremelling, Sheng Zhong
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Abstract
A rotor for an electric machine is disclosed, the rotor including a plurality of cavities filled with a magnetic material. In the disclosed rotor, the magnetic material includes Samarium-Iron-Nitrogen (Sm—Fe—N) particles, Manganese-Bismuth (Mn—Bi) particles, and a polymer binder. Performance characteristics of the magnetic material, such as following the rule of mixtures and exhibiting a linear relationship based on volume fraction of the Mn—Bi particles, are also disclosed.
Claims9
A method of producing a rotor of a magnetic material comprising Samarium-Iron-Nitrogen (Sm—Fe—N), Manganese-Bismuth (Mn—Bi), and a polymer binder of an electric machine, comprising:
- determining a target volume fraction of Mn—Bi of the magnetic material associated with desired performance characteristics of the magnetic material based on a predetermined linear relationship of volume fraction of the Mn—Bi with performance characteristics, the performance characteristics including coercivity or magnetization, wherein the predetermined linear relationship is based on Mn—Bi particle sizes being from 1 to 100 microns;
- forming pellets that include a mixture of Sm—Fe—N particles, Mn—Bi particles, and polymer binder according to the desired volume fraction;
- melting the pellets to form a polymer melt;
- and
- filling cavities of the rotor directly with the polymer melt to produce the magnetic material.
Dependencies are inferred from the claim text.