| 摘要 |
PURPOSE:To decrease error voltage by controlling ON/OFF of corresponding each phase switching element in a scheduled order. CONSTITUTION:The width of each pulse of selected voltage vector is scheduled in every control cycle, and according to this schedule, the on-off control of each phase switching element Tra-Trc and Tra'-Trc' is performed. In this case, it is scheduled in such order as the one long in pulse width being positioned at the first place of the control cycle, so within that schedule there is no necessity of changing the condition of the pulse, and the first pulse can be output accurately. Moreover, even if the next pulse to be output after the output of the first pulse width is short in pulse width, it is after completion of the schedule of the pulse width, so this short pulse can be output accurately. |
