| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a current detector for a three-phase motor, correcting an error in detection/estimation of a phase current of the three-phase motor. <P>SOLUTION: When a detection mode is set to detect a current of one phase based on a terminal voltage of a shunt resistor from an estimation mode in which the current is estimated based on the current detection value of the other two phases, a difference Au between a current detection value Iu at a time point θ2 and a command current value Iucom is calculated. A command current value Iucom-1 at a previous time point θ1 and the difference Au are used to calculate an estimated value Iue-1 of an actual current at the previous time. 1/3 of the difference between the estimated actual current value Iue-1 and the estimated current value Iu-1 at the previous time is calculated as a current detection error, and a current detection value is corrected based on a weighted mean value of the current detection error. <P>COPYRIGHT: (C)2010,JPO&INPIT |
