| 摘要 |
PCT No. PCT/JP98/01242 Sec. 371 Date Nov. 20, 1998 Sec. 102(e) Date Nov. 20, 1998 PCT Filed Mar. 23, 1998 PCT Pub. No. WO98/43139 PCT Pub. Date Oct. 1, 1998An amount of difference between a commanded position and an actual position resulting from reversing a direction of movement is found before machining and is stored in a memory of a positional difference controller (9). Then, a move command Pc is monitored in the process of machining as to whether or not a sign of the move command is reversed, and the amount of difference is added to the move command to correct a move command value when the reversion of the sign is detected. Then, position/speed/current control (3) is performed on the basis of a difference between the corrected move command value and position feedback Pf from a servo motor (5), that is, a corrected positional deviation Er, and the servo motor (5) is driven.
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