A Novel Self Cooling SRM for Electric Hand Tools

Koichi Koinuma, Kohei Aiso, Kan Akatsu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Electric hand tools require high efficiency, small-size, low cost, and improving convenience. To achieve these demands, Switched Reluctance Motor (SRM) is expected for electric hand tools motor as an alternative for blushless Permanent Magnet Synchronous Motor (PMSM). SRM is suited for electric hand tools from advantages such as the low manufacturing cost, the simple and robust structure, the high speed driving and operating under high temperature condition. However, SRM has a disadvantage that torque density is lower than it of PMSM. Therefore, SRM needs to add higher current than it of PMSM to achieve the same output torque. Moreover, winding temperature increases very fast by the large copper loss. To overcome this problem, this research proposes a self cooling SRM. Self cooling SRM can realize the same output torque and the same volume with the PMSM system including fan, and it can reduce the winding temperature by the self cooling effect.

Original languageEnglish
Title of host publication2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781479973118
Publication statusPublished - 2018 Dec 3
Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
Duration: 2018 Sept 232018 Sept 27


Other10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
Country/TerritoryUnited States


  • Electric hand tools
  • Switched reluctance motor (SRM)

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Control and Optimization
  • Computer Networks and Communications
  • Hardware and Architecture
  • Information Systems and Management


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