| Project/Area Number |
15H03943
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Intelligent mechanics/Mechanical systems
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥14,170,000 (Direct Cost: ¥10,900,000、Indirect Cost: ¥3,270,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2016: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
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| Keywords | アクチュエータ / 圧電アクチュエータ / 超音波モータ / リニアモータ / マイクロモータ / 弾性表面波素子 / 摩擦駆動 / MEMS / 圧電デバイス / 弾性表面波 / 進行波 / 超音波 / 圧電材料 / マイクロマシン / トライボロジー / レイリー波 |
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| Outline of Final Research Achievements |
The surface acoustic wave (SAW) motor, as a type of traveling wave ultrasonic motor, has been studied for years. A Rayleigh wave is excited by a unidirectional interdigital transducer (U-IDT) in a lithium niobate stator. Through frictional force, a driven slider can achieve linear motion. At the contact surfaces of the stator and slider, one problem observed is the lack of tolerance to wear. Owing to the large mohs hardness, a novel approach to the fabrication of a sapphire stator is investigated to improve frictional durability. In the novel sapphire stator, the Rayleigh wave, generated by the lithium niobate U-IDT transducer, is transmitted to the sapphire stator surface through pure mechanical integration. Through measurement results, the sapphire stator is evaluated via the admittance characteristics of the wave excitation unit, the normal vibration of the Rayleigh wave, and the horizontal vibration velocity of the Rayleigh wave.
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| Academic Significance and Societal Importance of the Research Achievements |
サファイアと同じ組成であるアルミナ・セラミクスを摩擦材として実用化された超音波モータでは，動作距離10,000km（推定10,000時間）の寿命を実現している。アルミナ・セラミクスの単結晶材料であるサファイアを摩擦駆動部に用いることで高い耐久性が期待できる。振動発生部には，単結晶ニオブ酸リチウムを用いることで高いパワー密度を実現し，摩擦駆動部には，耐摩耗性と機械強度に優れた単結晶サファイアを用いることで高い耐久性を目指しているのが，本弾性表面波モータである。
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