Patent ID: 6034450
Filing Date: 2000-03-07
Classification: B82Y,H01F,H02K

Abstract:
A stepping motor having a stator provided with an electromagnet and a rotor composed of a hard magnetic alloy, wherein the hard magnetic alloy has a composition represented by the following formula:T.sub.x M.sub.y R.sub.z B.sub.w Si.sub.twherein T represents at least one element selected from Fe and Co, M represents at least one element selected from Nb, Zr, Hf and Ta and R represents at least one element selected from rare earth elements and suffixes x, y, z, w and t which represent a composition ratio satisfy 88.ltoreq.x.ltoreq.92, 0.5.ltoreq.y.ltoreq.3, 3.ltoreq.z.ltoreq.7, 3.ltoreq.w.ltoreq.7 and 0.ltoreq.t.ltoreq.5 atomic percent, and further wherein said hard magnetic alloy has a remanence ratio (Ir/Is) of at least 0.7 where (Ir) is the remanent magnetization and (Is) is the saturation magnetization.