| 摘要 |
PROBLEM TO BE SOLVED: To suppress a surge voltage caused by mutual intensification of voltage oscillations occurring immediately after switching.SOLUTION: In the switching timing based on the comparison of voltage command signals U, V, W and a carrier signal, when there are a plurality of times of switching timing of a switching element of the same phase within a set time ts, the switching timing is changed so that the switching timing has an interval of a predetermined time tp. Consequently, mutual interference of voltage oscillations due to a plurality of times of switching can be suppressed, and generation of a surge voltage due to mutual intensification of voltage oscillations can be suppressed. |
