Abstract
Elevators in the building are the main vertical traffic system and they transport passengers to their destination floors conveniently. The ordinary elevator system uses the rope traction mechanism which moves the rope and drive pulley simultaneously by the friction force. Therefore, the regular maintenance is required to keep the proper friction force to the drive pulley. In this paper, we propose Rope Slip Observer (RSO) as a support tool for the maintenance. As RSO can estimate the rope slip on the drive pulley induced by friction reduction, it can watch the friction condition of the traction system in real time. Firstly, fundamental equations of motion for the traction elevator system are derived and a simple RSO model is proposed by the equations. Secondly, the proposed RSO model is improved by adding more detailed parameters of the actual elevator system. Finally, the improved RSO model is evaluated by experiment and we can conclude that the estimated rope slip by RSO model shows the same response as the measured one.
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