A spherical motor driven by electro-magnets based on polyhedrons

Akio Gofuku, Kazuki Adachi, Yuta Okido, Tomoaki Yano

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This paper describes the development of a spherical motor, hereinafter called “14-12 spherical motor.” This sphericalmotor utilizes two polyhedrons – a truncated regular octahedron and a regular dodecahedron – for the arrangement of permanent magnets on the rotor and electro-magnets on the stator. The 14-12 spherical motor has two types of rotation axes and six rotation axes in all. Five-phase alternating current was applied to the electro-magnets to rotate the rotor. This study also developed a simulation model for the 14-12 spherical motor to numerically simulate the dynamic behavior of the motor. Basic performance was measured and simulated to evaluate (1) the relation between rotation speed and maximum output rotation torque and (2) cogging torque. Waveforms of the five-phase alternating current were improved using the simulation model in order to increase output rotation torque for the rotation axis with the smaller torque.

Original languageEnglish
Pages (from-to)599-608
Number of pages10
JournalInternational Journal of Automation Technology
Issue number4
Publication statusPublished - 2016


  • Basic rotation performance
  • Dynamic simulation
  • Electro-magnetic force
  • Five-phase alternating current
  • Spherical motor

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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