| 摘要 |
PURPOSE:To accurately control a motor by calculating a secondary resistance with the voltage command of a controller and an AC signal component contained in a current flowing to the motor, and calculating a slip angle frequency with the secondary resistance. CONSTITUTION:An AC signal of an angular frequency omega output by an oscillator 20 is added to an exciting current basic wave component command value I d to form an exciting current command i d. A slip angle frequency command calculator 7 calculates a slip angle frequency command value omega on the basis of the command i d, a secondary current component i1q, and a secondary resistance calculated value r. Here, a secondary resistance calculator 50 calculates a secondary resistance on the basis of the exciting current axial component V d of a primary voltage command, the component i1d, and an angular frequency omega*component contained in the component i1q. Thus, a secondary time constant can be accurately detected, and a motor can be accurately controlled. |
