Magnetic absolute position encoder with an undulating track

摘要: A magnetic-type absolute position encoder includes a magnetic drum having material magnetized on circumferential surface thereof is rotated and in one revolution calculated based sinusoidal cosinusaoidal signals outputted by reluctance element arranged to oppose the surface. The polarities of (2) (1) are aligned direction rotational axis form magnetization track (3). In case where signal n cycles per be generated, made undulate axis. cosinusoidal phase difference 90° with respect this extracted from (3) (4), calculating means (5) using these signals.