Identifying technology opportunities for electric motors of railway vehicles with patent analysis

Yunkoo Cho, Young Jae Han, Jumi Hwang, Jiwon Yu, Sangbaek Kim, Chulung Lee, Sugil Lee, Kyung Pyo Yi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


An electric motor is a device that changes electrical energy into mechanical energy for railway vehicles. When developing the electric motor, it used to be developed simply for structures or control methods of the motor itself without considering convergence with other devices or tech-nologies. However, as the railway vehicles become more advanced, technology development through convergence with other devices or technologies is spreading. Therefore, based on patent data related to the electric motors applied to the railway vehicles, this research aims to carry out technical forecasting for establishing research and development (R and D) direction for new technologies by predicting vacant technologies from the point of view of technology convergence. In other words, we studied how to find the vacant technologies in a field of convergence technology for the electric motor of the railway vehicles by analyzing the patent data. More specifically, we search the patents data associated with the electric motor of the railway vehicle that contain multiple IPC codes, and use multiple IPC codes to determine the field of convergence technology. In addi-tion, we extract keywords from the patents data related to each of the determined convergence technologies and define the vacant technologies by interpreting the field of convergence technology and the extracted keywords.

Original languageEnglish
Article number2424
Pages (from-to)1-14
Number of pages14
JournalSustainability (Switzerland)
Issue number5
Publication statusPublished - 2021 Mar 1


  • Convergence technology
  • Electric motor
  • Patent analysis
  • Vacant technology

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Renewable Energy, Sustainability and the Environment
  • Environmental Science (miscellaneous)
  • Energy Engineering and Power Technology
  • Management, Monitoring, Policy and Law


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