| 摘要 |
<P>PROBLEM TO BE SOLVED: To make an optimal d-axis current command by a simple method. <P>SOLUTION: The synchronous motor controller comprises a three-phase-two-phase converter 4 for converting a three-phase current value being provided to a synchronous motor into a d-axis current and a q-axis current, a q-axis current control operating section 6 for controlling the difference between a q-axis current command and the q-axis current to zero, a d-axis current control operating section 7 for controlling the difference between a d-axis current command and the d-axis current to zero, a two-phase-three-phase converter 5 for converting a q-axis voltage command and a d-axis voltage command into a three-phase voltage command, and a power converting section 3 for supplying power to the synchronous motor in response to the three-phase voltage command. A d-axis current command operating section 9 determines the difference (Vmax<SP>2</SP>-Vd<SP>*2</SP>)<SP>1/2</SP>-Vq<SP>*</SP>between the root of the square of voltage maximum value Vmax of the power converter minus the square of the d-axis voltage command Vd<SP>*</SP>and the q-axis voltage command Vq<SP>*</SP>, and then controls the d-axis current command by that difference. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
