MAGNETIC RING AND ROTATION SENSOR COMPRISING SAME

摘要

Provided is a magnetic ring comprising a magnetic pole section (30) that is formed on a ring (20). The magnetic pole section comprises a plurality of magnetic sections (31, 32) having different magnetic properties and a weakly magnetized section (33) having lower magnetic force than the magnetic sections. A first magnetic section (31) and a second magnetic section (32) are arranged in an alternating manner in the circumferential direction. The first magnetic section is adjacent to a first side surface (33a) of the weakly magnetized section. The second magnetic section is adjacent to the second side surface (33b). The magnetic force of the second magnetic section positioned on the first side surface side is reduced so that the position at which the maximum normal component of the magnetic field of the first magnetic section adjacent to the first side surface occurs is inhibited from being displaced from the center. The magnetic force of the first magnetic section positioned on the second side surface side is reduced so that the position at which the maximum normal component of the magnetic field of the second magnetic section adjacent to the second side surface occurs is inhibited from being displaced from the center. As a result, it is possible to minimize the occurrence of disturbance in a magnetic field configured from the weakly magnetized section and the adjacent magnetic sections.