| 摘要 |
PURPOSE:To enable high-precision detection, by installing the second detector available for detection of an absolute value corresponding to the first detector generating to a member to be measured an electric signal of period or amplitude corresponding to a travelling distance and to the travelling distance. CONSTITUTION:A table 31 is screwed on one side of an output shaft 41 of a synchronous motor 30 through a ball screw, the table 31 being free to move back and forth along the X-axis. A resolver 33 and the secondary output signals P1, P10, PA from an absolute position detector 34 are fed back to a driver/convertor circuit 32 through wires 36, 37, 38. The signals P1, P10, PA fed back to the circuit 32 are converted to position data there and transmitted to CPU40 through a line 39. An absolute angle value of a resolver 33 (motor 30) is calculated basing on the position data given from the circuit 32 at the CPU40 and by combined use of these data and the absolute position, the position at that moment of the table 31 can be detected.
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