Ultrasonic motor using two sector-shaped piezoelectric transducers for sample spinning in high magnetic field

Daisuke Yamaguchi, Takefumi Kanda, Koichi Suzumori, Kazuya Fujisawa, Kiyonori Takegoshi, Takashi Mizuno

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


This paper presents the design, fabrication process, and evaluation of an ultrasonic motor for sample spinning in a high magnetic field of solid-state Nuclear Magnetic Resonance (NMR). To decrease effects of the magnetic field on rotation, all motor components are made of materials that have low magnetic permeability. The motor, including the sample casing, is a maximum 31 mm in diameter and 50 mm high. The motor has two sector-shaped piezoelectric transducers. One transducer generates two different vibration modes, longitudinal and flexural, when two sinusoidal voltages are applied to transducers. To confirm that transducers can be driven in a high magnetic field, the effect of the magnetic field on the transducer was evaluated. The motor was driven at a frequency of 329.0 kHz. The maximum rotation speed and starting torque were 1.50 × 103 rpm and 26 μ Nm when applied voltage was 40 Vp-p. The rotation speed, controlled by a proportional-integral control system, was 1.20 × 103 rpm in a 7.0-T magnetic field. The motor was also applied to the sample spinning system of a high-resolution NMR spectrometer. We succeeded in obtaining 1 H-NMR signals of H2 O. The motor can therefore be used for a sample spinning system in a high magnetic field.

Original languageEnglish
Pages (from-to)384-391
Number of pages8
JournalJournal of Robotics and Mechatronics
Issue number2
Publication statusPublished - Apr 2013


  • High magnetic field
  • Piezoelectric transducer
  • Solid-state NMR analysis
  • Specific environment
  • Ultrasonic motor

ASJC Scopus subject areas

  • General Computer Science
  • Electrical and Electronic Engineering


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