| 摘要 |
<p>The missing traction of sheaves is prevented in an elevator including a plurality of sheaves and motors for driving the respective sheaves. An elevator control device includes a main cable linking a cage with a balance weight, a plurality of sheaves around which the main cable is wound, a plurality of motors driving the respective sheaves, a plurality of velocity control devices controlling torque of the respective motors, an error detection device which compares torque command values of the velocity control devices and outputs an error signal based on assumption that missing traction arises in either of the sheaves in response to the difference exceeding a predetermined reference value, wherein, a necessary operation mode is performed in accordance with the velocity command value to the velocity control devices, and the velocity command value to the velocity control devices is changed in accordance with the operation mode at the time when the error detection device outputs the error signal.</p> |
