| 摘要 |
An R/D converter allows high precision detection of a rotation angle of a rotor axis of a resolver having high rates of rotation. An A/D converter is built into a digital signal processor and converts a sine wave and cosine wave output from the resolver. An axis angle calculator calculates tan theta=A((sin omegat)(sin theta))/A((sin omegat)(cos theta)) from A(sin omegat)(sin theta) and A(sin omegat)(cos theta) and further calculates theta=tan<SUP>-1 </SUP>theta. The angle space is divided into quadrants and an offset value is set for each quadrant and by adding or subtracting the calculated theta to or from the offset value to form the final angle of the rotor axis of the resolver.
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