Natural Modes/Frequencies of “Track-Type” Ultrasonic Motors

Atsushi Kimura, Takashi Maeno, Hiroyuki Seki

Research output: Contribution to journalArticlepeer-review


Natural modes and natural frequencies of a “track-type” ultrasonic motor, one of the “travelling-wave-type” ultrasonic motors, is discussed. For generating the out-of-plain travelling wave which rotates in the track-shaped ring, we must design the vibrator so as to obtain two natural modes whose rank (number of nodal diameters and nodal circles) and natural frequencies are the same, and whose natural modes are shifted 90 degrees in phase and in time. In general, the natural frequencies of these two modes are different. We study the change in the natural modes/frequencies by changing the length of the straight part of the vibrator using finite-element analysis. Consequently, we find some specific cases where the two natural frequencies correspond. We also fabricate the vibrator in order to confirm the calculation.

Original languageEnglish
Pages (from-to)1644-1649
Number of pages6
JournalTransactions of the Japan Society of Mechanical Engineers Series C
Issue number562
Publication statusPublished - 1993 Jan 1
Externally publishedYes


  • Finite Element Method
  • Lateral Vibration
  • Mode of Vibration
  • Natural Frequency
  • Optimum Design
  • Ultrasonic Motor

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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