翻訳と辞書 Words near each other ・ Comatulida ・ Comatulidae ・ Comau ・ Comau Fjord ・ Comayagua ・ Comayagua Department ・ Comayagua F.C. ・ Comayagua prison fire ・ Comazar ・ Comazzo ・ Comb ・ Comb (anatomy) ・ Comb (disambiguation) ・ Comb binding ・ Comb Ceramic ・ Comb drive ・ Comb filter ・ Comb flounder ・ Comb generator ・ Comb honey ・ Comb over ・ Comb Ridge ・ Comb sort ・ Comb space ・ Comb Wash ・ Comb-crested jacana ・ Comb-toed jerboa ・ Comba ・ Comba (Lycia) ・ Comba, Goa Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Comb drive ： ウィキペディア英語版 Comb drive Comb-drives are capacitive actuators, often used as linear actuators that utilize electrostatic forces that act between two electrically conductive combs. Comb drive actuators typically operate at the micro- or nanometer scale and are generally manufactured by bulk micromachining or surface micromachining a silicon wafer substrate. The attractive electrostatic forces are created when a voltage is applied between the static and moving combs causing them to be drawn together. The force developed by the actuator is proportional to the change in capacitance between the two combs, increasing with driving voltage, the number of comb teeth, and the gap between the teeth. The combs are arranged so that they never touch (because then there would be no voltage difference). Typically the teeth are arranged so that they can slide past one another until each tooth occupies the slot in the opposite comb. Restoring springs, levers, and crankshafts can be added if the motor's linear operation is to be converted to rotation or other motions. The force can be derived by first starting with the energy stored in a capacitor and then differentiating in the direction of the force. The energy in a capacitor is given by: $E\; =\; \backslash frac\; C\; V^2$ $F\; =\; \backslash frac\; \backslash frac\backslash frac$ $V$ = applied electric potential, $\backslash in\_r$ = relative permittivity of dielectric, $\backslash in\_o$ = permittivity of free space (8.85 pF/m), $n$ = total number of fingers on both sides of electrodes, $t$ = thickness in the out of plane direction of the electrodes, $d$ = gap between electrodes. ==Structure of Comb-drives== • rows of interlocking teeth • half fixed • half part of movable assembly • electrically isolated • electrostatic attraction/ repulsion – CMOS drive voltage • many teeth increased force – typically 10μm long and strong ==Scaling Issues== Comb drives cannot scale to large gap distances (equivalently actuation distance), since development of effective forces at large gaps distances would require high voltages—therefore limited by electrical breakdown. More importantly, limitations imposed by gap distance limits the actuation distance. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Comb drive」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.