Ring-Type Rotary Ultrasonic Motor Using Lead-free Ceramics
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- Ring-Type Rotary Ultrasonic Motor Using Lead-free Ceramics
- Hong, Chang-Hyo; Han, Hyoung-Su; Lee, Sae-Shin; Wang, Ke; Yao, Hang-Zhou; Li, Jing-Feng; Gwon, Jung-Ho; Quyet, Nguyen Van; Jung, Jin-Kyung; Jo, Wook
- Issue Date
- JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY, v.24, no.4, pp.228 - 231
- 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 45.1kHz. 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.
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