| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device of low cost and high reliability, capable of reducing an output distortion specific to a v-connection type inverter. <P>SOLUTION: A three-phase v-connection type inverter converts a DC voltage to a three-phase AC voltage of arbitrary amplitude and frequency by controlling on/off of a semiconductor switching element for the amount of two phases. It is provided with tertiary harmonic calculation means 2 which generates a sine wave of the triple frequencies of an inverter output voltage command, multiplies the sine wave with an amplitude adjusting gain, and outputs a triple-frequency sine wave whose amplitude has been adjusted. The output is added to a U-phase voltage command and a W-phase voltage command at adders 31 and 32 for control, so that an output distortion, especially, is reduced. <P>COPYRIGHT: (C)2012,JPO&INPIT |
