A rotation angle detecting apparatus

Abstract

A rotation angle detecting apparatus for a motor including a main shaft includes an encoded gear plate and M first reluctance sensors. The encoding gear disc includes first gears having a first through hole and M first encoding sets distributed on circumferences of M different radius distances, respectively, and having N groove portions and N plane portions distributed between the groove portions, where N is a positive integer. The first reluctance sensors respectively correspond to the first encoded groups, and are configured to generate M first angular bits respectively according to magnetic flux passing through the first encoded groups. By virtue of the first reluctance sensor detecting magnetic flux respectively corresponding to the first encoded groups, more first angular bits are obtained to enhance detection stability at a high rotational speed.

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