Patent ID: 7192493

Claim:
An R-T-B system rare earth permanent magnet comprising a sintered body with a composition consisting essentially of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, providing that the rare earth elements include Y), 0.5% to 4.5% by weight of B, 0.02% to 0.6% by weight of Al and/or Cu, 0.03% to 0.25% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe, wherein a coefficient of variation (CV value) showing the dispersion degree of Zr in said sintered body is 130 or less and said magnet satisfies the condition that, with regard to a residual magnetic flux density (Br) and a coercive force (HcJ), Br+0.1×HcJ (dimensionless) is 15.2 or greater.