| 摘要 |
PURPOSE:To compensate the secondary resistance value immediately before starting a cage and to accurately control via vector by providing field control means for controlling the intensity of the field of an induction motor. CONSTITUTION:When an unbalance torque instructing circuit 9 generates, when starting an elevator, a torque to cancel an unbalanced torque previously to eliminate a shock at the brake opening time. Since a cage is still stopped at this time, a speed command is zero, only the torque command value due to the unbalanced torque is inputted to an exciting component current torque component current calculator 11 to generate a torque component current in response to the intensity of the field, and it is applied to an induction motor 5. |
