MAGNETIC ABSOLUTE POSITION ENCODER.

摘要

The magnetic absolute position encoder generates sine waves and cosine waves of dissimilar cycles for each of the channels to detect an absolute position in one turn. Phase calculation circuits (111 to 141) calculate phases for each of the channels using sine wave signals and cosine wave signals of each of the channels. Phase difference signal calculation circuits (151 to 154, 101 to 103) subtract phases of the channels from a phase of 4096 cycles per turn inthe first channel to generate phase signals of one cycle, 16 cycles and 256 cycles per turn. The absolute position in one turn is detected using these phase signals and the first phase signal.