Loss reduction of outer-rotor type high-speed interior permanent magnet motors

Sho Sakurai, Kenji Nakamura

Research output: Contribution to journalArticlepeer-review


Many communication servers are being installed in order to develop information technology (IT). The servers require not only high-performance processer but also its cooling system. Among the cooling systems, a cooling fan is the most suitable due to good balance between performance and cost. In order to further improve the fan's performance, both torque and speed of cooling fan motors are increased. However, iron loss and eddy current loss are also increased along with larger torque and higher speed, which worsens the efficiency. This paper investigates the optimum rotor structure for the fan motor in order to obtain sinusoidal flux distribution in air gap, which can reduce the iron and eddy current losses.

Original languageEnglish
Pages (from-to)861-868
Number of pages8
JournalInternational Journal of Applied Electromagnetics and Mechanics
Issue number1-4
Publication statusPublished - 2020


  • cooling fan
  • Halbach array
  • IPM motor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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