Rotation detector

摘要

A rotation detector that detects rotational position with high precision. The rotation detector includes a rotor (2) having a shaft (4). Projections (6a, 6b, 6c) are located at predetermined intervals on the periphery of the rotor (2) and extend in an axial direction. The rotation detector further includes magnets (13b, 14b, 15b) and magnetism detecting elements (13a, 14a, 15a) respectively detecting magnetism of the magnets. At least one of the magnets and the detecting elements are arranged between the projections and the shaft at predetermined intervals. <IMAGE>