| 摘要 |
A multi-turn absolute magnetic encoder, comprising (M+1) counting units, a single-turn signal processing unit (6), and a multi-turn signal processing unit (12). Each counting unit comprises counting wheels (4, 10) with a cylindrical ring permanent magnet (14) fixed thereon, and a tunneling magnetoresistive angular displacement sensor (11). The magnetoresistive angular displacement sensor (11) is located within a region in a detection plane of the permanent magnet (14) at within a specific radius range from the axis of the cylindrical ring permanent magnet (14), within the detection plane the angle of a component of a magnetic field generated by the permanent magnet (14) is linearly proportional to the rotation angle of the cylindrical ring permanent magnet. The single-turn signal processing unit (6) calculates and outputs a code characterizing the absolute angular position of the input shaft (3) based on the sensor signal of the first counting unit; and the multi-turn signal processing unit (12) calculates and outputs the integer number of turns of the input shaft based on the sensor signals of the second counting unit to (M+1) counting units. |
