| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-phase modulation motor controller capable of suppressing the deterioration of an operation state of a motor due to errors of determination operations in the vicinity of zero cross. <P>SOLUTION: A positive threshold V1 and a negative threshold V2 are set (87). A phase voltage command which has a value of ≤V1 and ≥V2 in three-phase voltage commands U, V and W is shifted to 0V. The remaining phase voltage commands of the other two phases are offset in order to maintain an interphase voltage. Three-phase virtual voltage commands U', V' and W' are generated (88). A two-phase modulation voltage command is generated on the basis of the polarity of the three-phase virtual voltage commands (90). Thereby, it is possible to prevent the wrong selection of a phase to be fixed due to the unsteadiness of the three-phase voltage commands U, V and W in the vicinity of an AC zero point, especially, in the low voltage region. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
