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Development of Field Instrument for Measuring Rope Slippage in Traction Elevator
Abstract:
Among the various approaches to developing field equipment for measuring elevator rope slippage, this study, which utilizes contact-based motion measurement, stands out as a more practical and reliable methodology. The relative motion of the traction sheave and the rope is sensed by encoders and computed by microprocessors. Primarily, the movements of the traction sheave and the hoisting ropes must be measured to determine the rope slippage during various dynamic movements of the elevator. Modern elevators achieve precise control through the use of motion sensors. However, quantitative detection of rope travel is more difficult than that of the traction sheave. Thus, the research intended to find an alternative to measure the motion of the passenger cabin. A laboratory-scale prototype was developed to investigate rope slippage behavior under varying weight ratios, simulating different load conditions in an actual elevator. The experiments revealed that increasing the weight ratio between the passenger car and the counterweight leads to a noticeable increase in rope slippage, highlighting the sensitivity of slippage to tension ratios in traction systems. The research extended to field-level experiments to examine the traction slippage behavior of an elevator traction machine under no passenger load conditions. Results indicated that, in the absence of passenger weight, the traction machine exhibits greater slippage during upward movement compared to downward travel. The experimental setup yielded promising results from both experimental tests and field measurements. Ultimately, the encoder-based motion measuring systems demonstrated potential for field applications when integrated with enhanced mechanisms.
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39-48
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May 2026
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© 2026 Trans Tech Publications Ltd. All Rights Reserved
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