| 摘要 |
PROBLEM TO BE SOLVED: To attain highly efficient motor control by identifying a motor resistance quickly and with high accuracy, without having to use a measuring instrument. SOLUTION: A motor constant identifying device 13 for an inverter outputs, in a resistance identification operation mode, a γaxis current command designating, sequentially a plurality of γaxis current values needed for resistance identification to a γaxis current controller 3 and identifies the correction value of stator resistance based on the γ axis current command values and an estimated γ axis induced voltage value computed by a γ-δ axis current and induced voltage estimating device, thereby outputting the identified correction value of the stator resistor to the γ-δ axis current and an induced voltage estimating device 8. The γ-δ axis current and induced voltage estimating device corrects, in a resistance identification operating mode, a stator resistance value included in a γ axis voltage current equation and a δ axis voltage current equation every time the correction value of the stator resistance is inputted and computes an estimated γ axis current value and an estimated δ axis current value as well as the estimated γ axis induced voltage value and an estimated δ axis induced voltage value by using the corrected resistance. |
