| 摘要 |
A conventional method for driving a servo-motor executed control by means of a current feedback loop, using a current sensor and an A/D converter. Consequently, the number of parts was great, cost reduction was difficult and it was difficult to avoid control errors caused by errors in the precision of the current sensor. The present invention comprises a method for driving a servo-motor by detecting a power voltage (V) of a servo-motor (4), controlling a voltage command (Vcmd) to a power converter (3) by numeric calculation using a detected value (Vcc) of this power voltage (V), and controlling power of a drive current (Iu, Iv, Iw). <IMAGE> |
