Importance

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Abstract

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. 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.

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First Claim