POSITION SENSOR

摘要

A position sensor measures an absolute position by A/D-converting sine and cosine wave signals and performing interpolation. The phase error between both signals caused by the movement of an object to be measured during the A/D conversion is corrected. Position data before the previous request is stored in an random access memory (RAM) (12). According to the position data, a central processing unit (CPU) (10) predicts the phase shift of one signal caused by the movement during the A/D conversion of the other signal, and position data is calculated by correcting the predicted phase shift.