Permanent magnet, motor, and generator

US10650947B2 · kind B2 · utility

Assignee

• Kabushiki Kaisha Toshiba · JP

Inventors

• Yosuke Horiuchi · Tokyo, JP
• Shinya Sakurada · Tokyo, JP
• Keiko Okamoto · Yokohama, JP
• Masaya Hagiwara · Yokohama, JP
• Tsuyoshi Kobayashi · Kawasaki, JP
• Masaki Endo · Ota, JP
• Tadahiko Kobayashi · Yokohama, JP
• Naoyuki Sanada · Ota, JP

Key dates

• Filing date: Mar 3, 2015
• Grant date: May 12, 2020
• Expiry date: Nov 23, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F1/0596
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention provides a high-performance permanent magnet. The permanent magnet has a composition that is expressed by a composition formula RpFeqMrCutCo100-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 Th2Zn17 crystal phase, and a Cu-M rich phase having a higher Cu concentration and a higher M concentration than the main phase.