Abstract
The mechanism which consists of the governor and the safety gear is one of the most important safety devices in the elevator system. The governor rope system has a governor pulley, a tension sheave and a governor rope that is connected to the car. To ensure the elevator’s safety, the dynamic behavior of the governor rope system must be studied in detail, however it requires a complicated simulation model and experiments to evaluate the behavior, which are time consuming. Therefore simplified formulations to check the dynamic behavior is necessary. This paper focuses on the dynamic behavior of the governor rope system, especially the dynamics of rope tension. Firstly, the governor rope system is modeled as a three-degree-of-freedom system. The rope is modeled by three linear spring elements, and the derived models can evaluate the vertical motion of the total system. Secondly, the rope tension distribution is given by a simple formula, because the rope is a continuous elastic body. The derived formula is a function of car acceleration and car position. Finally, the proposed model is compared with the experiments in an actual elevator system. As the experiment results reflect simulations using our model and formula, we can use them as optimal designs of the governor rope system.
