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Work load analysis for determination of the reduction gear ratio for a 78 kW all wheel drive electric tractor design

  • Kim, Wan-Soo (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Baek, Seung-Yun (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Kim, Taek-Jin (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Kim, Yeon-Soo (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Park, Seong-Un (Research and Development Institute, Tongyang Moolsan Co., Ltd.) ;
  • Choi, Chang-Hyun (Department of Bio-mechatronics Engineering, Sungkyunkwan University) ;
  • Hong, Soon-Jung (Department of General Education, Korea National College of Agriculture and Fisheries) ;
  • Kim, Yong-Joo (Department of Biosystems Machinery Engineering, Chungnam National University)
  • Received : 2019.05.08
  • Accepted : 2019.07.23
  • Published : 2019.09.01

Abstract

The purpose of this study was to design a powertrain for a 78 kW AWD (all wheel drive) electric tractor by analyzing the combination of various reduction gear ratios on a commercial motor using data from actual agricultural work and driving conditions. A load measurement system was constructed to collect data using wheel torque meters, proximity sensors, and a data acquisition system. Field experiments for measuring load data were performed for two environmental driving conditions (on asphalt and soil) and four agricultural operations (plow tillage, rotary tillage, loader operation, and baler operation). The attached implements and gear stages were selected through farmer surveys. The range of the reduction ratio was determined by selecting the minimum reduction ratio needed to satisfy the torque condition required for agricultural operations and the maximum reduction gear ratio to satisfy the maximum travel speed. The minimum reduction gear ratio selected was 57 in consideration of the working load condition and the maximum reduction gear ratio selected was 62 considering the maximum running speed. In the range of the reduction gear ratio 57 - 62, the selected motor satisfied all working torque conditions. As a result, the combination of the selected motor and reduction gear ratio was applicable for satisfying the loads required during agricultural operation and driving operation.

Acknowledgement

Grant : 100 kW급 총륜구동 자율주행 건설.농업용 로봇 플랫폼 기술 개발

Supported by : 한국산업기술평가관리원

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