| Budget Amount *help |
¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Research Abstract |
Ultrasonic motors have unique characteristics such as high torque at low speed, high holding torque, and silent motion. However, their applications are limited to certain mechanisms, e.g., autofocus mechanisms of cameras. It is difficult for practical ultrasonic motors to generate higher torque because they are fragile. A bolt-clamped Langevin-type longitudinal vibration transducer (BLT) is a transducer which satisfies high strength and large amplitude. A new standing-wave-type ultrasonic motor that incorporates BLTs was devised. Three BLTs are installed in the shape of a screw. The vibration and load characteristics of the screw-shaped ultrasonic motor were studied. The maximum torque, revolution speed, and efficiency of the ultrasonic motor were 0.67 Nm, 582 rpm, and 7.63%, respectively.
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