MAGNETIC ROTARY SENSOR

摘要

A magnetic rotary sensor has a rotary drum carrying magnetically recorded codes representative of discrete positions obtained by dividing one rotation of the drum into a predetermined number of portions. An interval between adjacent discrete positions identified by the codes is interpolated by interpolation signals generated on the basis of a sine wave signal and a cosine wave signal that are so produced by magnetic signals additionally recorded on the drum that the periods thereof correspond to the interval. As a result, a magnetic rotary sensor can be obtained that is capable of identifying the rotational positions of a rotatable body with the high resolution but without increasing the size of the rotary drum.