| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress fluctuation of output torque of a motor in switching from pulse width modulation control to rectangular wave control. <P>SOLUTION: An inverter is controlled so that when PWM control is switched to rectangular wave control, an electric angle θe at a timing closest to zero cross of a voltage command out of the switching timings of a switching element of the inverter is set as a zero cross switching electric angle θe0 in the PWM control, the rectangular wave is switched in the phase of the voltage command in the switching timing closest to the zero cross of the voltage command, a voltage phase command θ* of the rectangular wave control is calculated on the basis of an electric angle θe0 in zero cross switching so as to change to the rectangular wave control, and the rectangular wave control is started at the voltage phase command θ*. <P>COPYRIGHT: (C)2011,JPO&INPIT |
