Patent ID: 6181036
Filing Date: 2001-01-30
Classification: G01D,H02K,H02P

Abstract:
In a rotational angle detector for a brushless motor, a detecting part of said detector is provided with a wiring configuration comprising a giant magnetoresistive element, two sensor leads connected one each to opposite terminals of said element, and an insulation layer interposed between said senor leads, wherein said giant magnetoresistive element is selected from the group consisting of:(a) a magnetic particle dispersion type giant magnetoresistive element which is formed of a material having ferromagnetic particles 5 to 500 nm in maximum major diameter dispersed in a nonmagnetic material;(b) an artificial lattice type giant magnetoresistive element which is formed of a material having a nonmagnetic material and a ferromagnetic material alternatively superposed, said nonmagnetic material being at least one element selected from the group consisting of Ag, Cu, and Au and containing at least one element selected from the group consisting of Al, Ti, Pd, Pt, and Rh in an amount of up to a maximum of 20 atomic %, and said ferromagnetic material being at least one element selected from the group consisting of Fe, Co, and Ni and containing at least one element selected from the group consisting of Cr and Mn in an amount of up to a maximum of 5 atomic %; and(c) a colossal magnetoresistive element which is formed of a material having a composition represented by the following general formula:Ln.sub.1-y AE.sub.y MnO.sub.3-z,wherein Ln represents at least one rare earth element, AE represents at least one element selected from the group consisting of Ca, Sr, and Ba, and y and z respectively represent atomic ratios falling in the ranges of 0.2.ltoreq.y.ltoreq.0.4 and -0.1.ltoreq.z.ltoreq.0.3.