| 摘要 |
PURPOSE:To eliminate the noise or oscillation due to high frequency from the titled inverter by reducing torque pulses by a method wherein, when a section of magnetic vectors approximated to a circle is shifted, the magnetic vectors are selected not to make two unit inverters change simultaneously. CONSTITUTION:Three vectors in a section 9 consist of main (1, 0, 1), sub (0, 0, 1) and zero (1, 1, 1) while three vectors in a section 10 consist of main (1, 0, 1), sub (1, 0, 0) and zero (1, 1, 1). Therefore, when the section is shifted from 9 to 10, the main (1, 0, 1) can be selected as the first vector of section 10 so that one phase only may be changed from every vector in the section 9. Thus unit inverters exceeding two phases can be prevented from changing simultaneously to avoid any reversed polarity pulse. Resultantly, the interline voltage wave form can avoid the inverse polarity pulse. |
