| 摘要 |
<p>To provide a current controller capable of constantly detecting an offset value of a current detection system, the offset value overlapping with a current detection value, in a state of regular operation of a motor to correct the current detection value and capable of current detection with high accuracy and a current offset correction method of the same. A carrier wave peak-trough judging part 10 is provided to discriminating the peak and the trough of a carrier wave. An A/D converted value detected in falling from the peak of the carrier wave is used as a current detection value. An A/D converted value detected in rising from the trough of the carrier wave is used as an offset value in the case that a modulated wave command is larger than a comparison standard value capable of computation by means of a calculation formula. On the basis of the current detection value and the offset value, carried out is an operation of a current detection correction value.</p> |
