| 摘要 |
<p>A difference operation unit (6) calculates a difference ΔCi between the data of upper six bits of the interpolation data (D4) in a lower channel (e.g., a 4096μ channel) having a large number of cycles and the data of lower six bits of the interpolation data (D3) in an upper channel (e.g., a 256μ channel) having a small number of cycles. A corrected data operation unit (8) finds a corrected data Ci such that the difference becomes smaller than a predetermined value or becomes minimal. Using the corrected data Ci, the angle data correction units (3a to 3c) correct the interpolation data (D3) in the neighboring upper channel, and the upper four bits of interpolation data (D4' to D1') of the channels after corrected are synthesized in order to detect an absolute position of the rotary shaft.</p> |
