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An ultrasonic micro-motor usually has small torque because of its small size of the transducer. If the micro-motor is driven by large size transducer, we can expect better motor characteristics. In this research, a Langevin transducer with 31.5 mm in diameter is used to drive a rotor with 5 mm in diameter. Newly designed horn with oblique slits is used for vibration mode conversion, then elliptical...
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