| 摘要 |
In control using a method with a circular locus, a switching pattern for detecting line current is maintained for a minimum time limit or longer while magnetic flux is maintained throughout a control cycle. To accurately measure DC link current, a voltage vector is required to be maintained for a minimum time limit Tmin or longer. An original vector Ä4·V4 has a magnitude smaller than the length Tmin. This means that a time period for which a voltage vector V6 is used is shorter than the minimum time limit Tmin. Correction vectors Ä4'·V4 and Ä6'·V6 are thus used. In a predetermined cycle T0, compensation vectors Ä4"·V4 and Ä6"·V6 are used along with the correction vectors Ä4'·V4 and Ä6'·V6, and time integrals of the voltage vectors are not impaired throughout the predetermined cycle T0. |
