Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Ring-Type Rotary Ultrasonic Motor Using Lead-free Ceramics

  • Hong, Chang-Hyo (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology) ;
  • Han, Hyoung-Su (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology) ;
  • Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan) ;
  • Wang, Ke (State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University) ;
  • Yao, Fang-Zhou (State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University) ;
  • Li, Jing-Feng (State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University) ;
  • Gwon, Jung-Ho (HanaUtech) ;
  • Quyet, Nguyen Van (HanaUtech) ;
  • Jung, Jin-Kyung (School of Materials Science and Engineering, University of Ulsan) ;
  • Jo, Wook (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2015.07.14
  • Accepted : 2015.07.20
  • Published : 2015.07.31
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Abstract

Ultrasonic motors provide high torques and quick responses compared to their magnetic counterparts; therefore, they are widely used in small-scale applications such as mobile phones, microrobots, and auto-focusing modules in digital cameras. To determine the feasibility of lead-free piezoceramics for ultrasonic motor applications, we fabricated a ring-type piezoceramic with a KNN-based lead-free piezoceramic (referred to as CZ5), intended for use in an auto-focusing module of a digital camera. The vibration of the lead-free stator was observed at 45.1 kHz. It is noteworthy that the fully assembled lead-free ultrasonic motor exhibited a revolution speed of 5-7 rpm, even though impedance matching with neighboring components was not considered. This result suggests that the tested KNN-based piezoceramic has great potential for use in ultrasonic motor applications, requiring minimal modifications to existing lead-based systems.

Keywords

References

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