An ultrasonic motor using a metal-ceramic composite actuator generating torsional displacement

Burhanettin Koc, Aydin Dogan, Yuan Xu, Robert E. Newnham, Kenji Uchino

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


An ultrasonic motor composed of three components; a stator, a rotor and a ball bearing is proposed. The stator is made of an active piezoelectric ring, poled in the thickness direction and bonded with two windmill-like slotted metal endcaps. The stator is excited through its two electrodes, generating ultrasonic vibration in the radial direction at a radial mode resonance frequency. The two identical metal endcaps on both sides of the ring, bonded after shifting 45° with each others, transfers the radial vibration into longitudinal and tangential vibrations. The combination of these vibrations (longitudinal and tangential) generates rotation due to frictional interaction between the center part of the top endcap and the periphery of the rotor. A prototype motor with 11.0mm diameter was fabricated and its transient characteristics were measured. The maximum torque of 1.36 mNm was obtained at a speed of 480 rpm.

Original languageEnglish (US)
Pages (from-to)5659-5662
Number of pages4
JournalJapanese Journal of Applied Physics
Issue number10
StatePublished - Oct 1998

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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