| 摘要 |
PURPOSE:To control a vector in good response without influence of the variation of the secondary resistance value used as a circuit constant due to a temperature rise by detecting a motor torque. CONSTITUTION:A torque of an induction motor 20 is detected by a torque detector 30, and the secondary resistance R2 of an induction motor is obtained in a coordinates compensation calculator 40 and the secondary resistance compensation calculator 50 on the basis of a torque tau by detecting the torque of the motor 20 by a torque detector 30. The secondary resistor R2 is used as one of circuit constants used in case of calculating an angular frequency command value omega0*. As a result, the resistance R2 is reflected in the primary current I1* of the motor 20 controlled in a current control type frequency converter 18, and the torque of the motor 20 is controlled in good response for the torque command value tau*. |
