| 摘要 |
PROBLEM TO BE SOLVED: To provide a permanent magnet synchronous motor control device capable of preventing fine vibration of an electric motor shaft when a permanent magnet synchronous motor having salience is placed in a servo-lock operation under position-sensor-less control.SOLUTION: A permanent magnet synchronous motor control device includes a speed command comparator 3 which compares a speed command 23 with a predetermined command switching determination value 24, and further a d-axis current command switch 11 which selects one of a set stronger excitation command 37 and a generated d-axis current command 28 according to a comparison result of the speed command comparator 3, and outputs the selected stronger excitation command or d-axis current command as a d-axis current command 38 that a d-axis current deviation for finding a deviation by a d-axis current deviation computing element 12. When a target value 20 becomes a stop position command through a servo-lock operation and the speed command 23 becomes a 0-speed command, the d-axis current command switch 11 selects the stronger excitation command 37. |
