A piezoelectric micromotor with a stator of φ = 1.6mm and l = 4mm using bulk PZT

Serra Cagatay, Burhanettin Koc, Paul Moses, Kenji Uchino

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29 Scopus citations


The smallest discrete piezoelectric ultrasonic motor using bulk ceramics was developed. We are proposing basically a two-part motor: stator and rotor. The stator of the present motor consists of a hollow metal brass tube with outer diameter of 1.6mm, inner diameter of 0.8mm and length of only 4mm with 2 PZT plates bonded onto it. Owing to the asymmetrical stator surface, two degenerated orthogonal bending modes were slightly split, resulting in a wobbling motion. Thus, the motor can be driven by a single driving source. The rotor is a spring, which is basically different from previous designs, pressed at both ends to the stator by a pair of ferrules. Consequently, the length of the whole motor assembly was reduced significantly; a final motor length of only 5 mm was obtained. The working frequency under zero load was approximately 227-233 kHz. Although the size is small, relatively high power was obtained under an optimized load condition: torque of 0.06 mNm, maximum power of 3.2 mW with a speed of 118 rad/s, and maximum efficiency of 11% under 48 Vrms at 221 kHz.

Original languageEnglish (US)
Pages (from-to)1429-1433
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number4 A
StatePublished - Apr 2004

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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