| 摘要 |
PURPOSE:To obtain an elevator which has good riding feeling by detecting a torque, calculating the variation in the constant of a motor from the torque, and correcting the constant of the motor, thereby accurately controlling the torque. CONSTITUTION:A torque detector 101 is mounted on the rotational shaft of an induction motor 99 to detect a torque and to form a torque signal TM. A calculator 103 inputs a slip angle frequency omegas, the torque signal TM and a magnetic flux signal phir<2>, and calculates a rotor circuit resistance Rr. The resistance Rr output from the calculator 103 is input to a controller 20, which calculates a torque component current It on the basis of the Rr. |
