Permanent magnet, and motor and power generator using the same

A permanent magnet, comprising

• a sintered compact consisting of a composition expressed by a composition formula 1:
• Rp1Feq1Mr1Cus1Co100-p1-q1-r1-s1,
• wherein R is at least one element selected from the group consisting of rare-earth elements, M is at least one element selected from the group consisting of zirconium (Zr), titanium (Ti), and hafnium (Hf), p1 is a number satisfying 10≤p1≤13.3 at %, q1 is a number satisfying 25≤q1≤40 at %, r1 is a number satisfying 0.87≤r1≤5.4 at %, and s1 is a number satisfying 3.5≤s1≤13.5 at %,
• wherein the sintered compact comprises crystal grains and a Cu-rich phase;
• wherein each of the crystal grains is composed of a main phase including a cell phase having a Th2Zn17 crystal phase and a cell wall phase existing so as to surround the cell phase;
• wherein the Cu-rich phase has a composition expressed by a composition formula 2:
• Rp2Feq2Mr2Cus2Co100-p2-q2-r2-s2,
• wherein R is at least one element selected from the group consisting of rare-earth elements, M is at least one element selected from the group consisting of Zr, Ti, and Hf, p2 is a number satisfying 10.8≤p2≤11.6 at %, q2 is a number satisfying 25≤q2≤40 at %, r2 is a number satisfying 1≤r2≤2 at %, and s2 is a number satisfying 5≤s2≤16 at % and 1.5≤s2/s1≤4;
• and
• wherein an average thickness of the Cu-rich phase is 0.1 μm or more and 2 μm or less, and the Cu-rich phase exists in grain boundaries of the crystal grains.