PERMANENT MAGNET, MOTOR AND GENERATOR

摘要

The invention provides a high-performance permanent magnet. The permanent magnet has a composition that is expressed by a composition formula R p Fe q M r Cu t Co 100-p-q-r-t , where R is at least one element selected from a rare earth element, M is at least one element selected from the group consisting of Zr, Ti, and Hf, p is a number satisfying 10.8 ‰¤ p ‰¤ 12.5 atomic percent, q is a number satisfying 25 ‰¤ q ‰¤ 40 atomic percent, r is a number satisfying 0.88 ‰¤ r ‰¤ 4.5 atomic percent, and t is a number satisfying 3.5 ‰¤ t ‰¤ 13.5 atomic percent. The permanent magnet also has a metallic structure that includes a main phase having a Th 2 Zn 17 crystal phase, and a Cu-M rich phase having a higher Cu concentration and a higher M concentration than the main phase.