110 kW급 수소 연료전지 기반 트랙터의 동력전달시스템 설계 및 효율 분석 = Design and Efficiency Analysis of Power Transmission System for 110 kW Hydrogen Fuel-Cell Tractor

다국어 초록 (Multilingual Abstract)

This study developed a 110-kW hydrogen fuel-cell tractor powertrain and evaluated the efficiencies of its major components, as well as the overall power transmission system. The measured efficiencies of the fuel cell, driving motor, and PTO motor were 82.25%, 63.77%, and 25.21%, respectively. In contrast, simulations predicted efficiencies of 96.12%, 71.60%, and 36.29%, indicating acceptable differences of 7–14%, which fall within the generally recognized power-efficiency error range. To compare this system with a conventional one, we analyzed the power transmission efficiency of an equivalent internal-combustion tractor. The average front- and rear-axle outputs were 3.28 kW and 8.14 kW, respectively, resulting in a total axle output of 11.42 kW and a PTO output of 7.18 kW. The axle and PTO efficiencies were calculated at 61.22% and 38.80%, which are 15.08% and 54.56% lower, respectively, than those of the hydrogen fuel-cell tractor. These differences are due to the fuel-cell motor powertrain's ability to minimize mechanical losses and deliver high torque across a wide operating range. This design allows for precise speed control and maintains high efficiency under varying load conditions. Therefore, the proposed hydrogen fuel-cell tractor powertrain demonstrates superior power transmission performance compared to conventional mechanical systems and is well-suited for stable field-driving operations.