| 摘要 |
<P>PROBLEM TO BE SOLVED: To make it possible to maintain linear relationship of a voltage command and output voltage even if a sine-wave region where a modulation rate is at or below a threshold value and an over-modulation region where the modulation rate exceeds the threshold value are switched. <P>SOLUTION: An inverter control device 60 includes: a voltage conversion control unit 66a for outputting a voltage control signal Vc to an inverter 20; and a voltage amplitude correction unit 65a (linear correction unit) for correcting so that a voltage command and output voltage will be linear by means of a map for correction using two or more variables as argument among variables controlling a voltage control signal Vc such as a modulation rate, synchronous number k, and phase if the modulation rate of the voltage control signal Vc output by the voltage conversion control unit 66a exceeds a threshold value. Because sine-wave control of the modulation rate equal to or less than the threshold value can be linear naturally, switching of control modes between sine-wave control and over-modulation control can be performed seamlessly. That is to say, the relationship between the voltage command and the first order component of output voltage can be maintained linearly. <P>COPYRIGHT: (C)2012,JPO&INPIT |
