| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve torque control accuracy by highly accurately measuring a permanent-magnet magnetic flux and an inductance from information of a current, a terminal voltage, and a speed in a control device for a permanent-magnet synchronous motor. <P>SOLUTION: A control device for a permanent-magnet synchronous motor includes an electric-constant measuring means for measuring a permanent-magnet magnetic flux and an inductance from a current detection value, a terminal-voltage detection value, and a speed detection value of a motor 80. The electric-constant measuring means includes: a d-axis magnetic-flux estimator 100 that catches the terminal voltage and the current of the motor 80 as vectors so as to estimate a magnetic flux from a current detection value, a terminal-voltage detection value, and a speed detection value; a current command generator 31 for controlling d-axis currents to a plurality of values when a magnetic-pole direction of a rotor is set as a d-axis and a direction orthogonal to the d-axis as a q-axis; and a parameter estimator 101 that approximates a relationship between the d-axis currents controlled to the plurality of values and each magnetic-flux estimated value respectively corresponding to each of the d-axis currents by a linear function, measures a d-axis inductance from a gradient of the linear function, and measures a permanent-magnet magnetic flux from an intercept of the linear function. <P>COPYRIGHT: (C)2010,JPO&INPIT |
