| 摘要 |
PURPOSE:To prevent the decrease of the output of an inverter by obtaining the voltage command of each axis by the specified voltage equation of an internal-magnet type brushless DC motor, obtaining the output voltage command and the output-voltage phase-angle command of the inverter, inputting the values into an inverter control part, and controlling the output voltage of the inverter. CONSTITUTION:The DC power from a DC power supply 1 is converted into the voltage output having the PWM waveform, which is controlled with an inverter main circuit 2. The voltage is supplied into the armature winding of an internal-magnet type motor 3. A d-axis voltage command and a q-axis voltage command are obtained by the voltage equation I of the internal-magnet type motor 3. The output voltage command V1 of the inverter by V1=(Vd<2>+ Vq2)<1/2> and the output-voltage phase-angle command theta1 by theta1=tan<-1>(Vd/Vq), are inputted into a d-axis current controller 41 and a q-axis current controller 42 of an inverter control part 4, respectively. The commands are connected to a d-q/3-phase converter 44 through switches 6. Thus, the output voltage of the inverter is controlled. Therefore, the decrease in output of the inverter can be prevented. |
