| 摘要 |
<p>In an inverter controller, it is possible to suppress the imbalance between down periods in the switching of a phase in which the switching is stopped. A PWM operation section (5) comprises a modulation wave generating section (11) for generating a modulation wave as the value of a voltage command to an inverter main circuit (2), a carrier wave generating section (12) for generating a carrier wave which serves as the standard of a switching command, and a comparison section (13) for comparing the modulation wave generated by the modulation wave generating section (11) with the carrier wave generated by the carrier wave generating section (12). The PWM operation section (5) controls the carrier wave generating section (12) to set a carrier wave frequency to an integral multiple of a modulation wave frequency during the operation of the two-phase modulation mode in which the switching of any one of three phases constituting the inverter main circuit (2) is stopped.</p> |
