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JRM Vol.25 No.2 pp. 384-391
doi: 10.20965/jrm.2013.p0384
(2013)

Paper:

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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**, and Takashi Mizuno***

*Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan

**Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan

***JEOL RESONANCE Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan

Received:
October 19, 2012
Accepted:
February 18, 2013
Published:
April 20, 2013
Creative Commons License
Keywords:
high magnetic field, specific environment, piezoelectric transducer, ultrasonic motor, solid-state NMR analysis
Abstract
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 µNm 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 1H-NMR signals of H2O. The motor can therefore be used for a sample spinning system in a high magnetic field.
Cite this article as:
D. Yamaguchi, T. Kanda, K. Suzumori, K. Fujisawa, K. Takegoshi, and T. Mizuno, “Ultrasonic Motor Using Two Sector-Shaped Piezoelectric Transducers for Sample Spinning in High Magnetic Field,” J. Robot. Mechatron., Vol.25 No.2, pp. 384-391, 2013.
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