usm 中文意思是什麼

usm 解釋
1. underwater-to-surface missile 水下對地導彈。
2. United States Mail 美國郵政。
3. United States Marine（s） 美國海軍陸戰隊。
4. United States Mint 美國造幣廠。

  1. Being a sort of new principle micromotor in the fronitier of science. the ultrosonic motor ( usm ) is developed at recently twenty years. utilizing the stator surface particle elliptical motion excited by piezoceeramics, the usm is drived by friction force between the stator and rotor. compared with the conventional electromagnetic motor, the ultrasonic motor has the following features : high speed, high holding torque when power is off and so on. because of it ' s characteristics, the ultrasonic motor has obtained some widespread application in robots, precise instrument, house electronical appliance, sapceecraft automobile and micromechanism

    超聲波電機（ ultrasonicmotor ）是近二十年來發展起來的一種新原理電機，其原理不同於傳統的電磁型電機，它是利用壓電陶瓷的逆壓電效應使定子的表面質點產生橢圓運動，通過定子和轉子之間的摩擦力驅動轉子運動。這種新型的電機與傳統電磁電機相比，具有響應快、不受電磁干擾、結構緊湊、低速、大扭矩、斷電自鎖等優點，因而在微型機械、機器人、精密儀器、家用電器、航天器、汽車等方面顯示出廣泛的應用前景。
  2. Usm unlisted securities market

    為掛牌上市證券市場
  3. New generation method of pencil drawing using usm sharpening

    銳化生成鉛筆畫的新方法
  4. Research on the design of firewall management system based on usm

    的防火墻管理系統的研究與設計
  5. Another negative attribute of the canon ef 180mm f / 3. 5 l usm macro lens is its slow focus speed

    另外一個180的弱點是它有極其慢的對焦速度。
  6. A new kind of driving circuit is designed, it realizes driving and frequency tracking of usm

    本文研究並設計了一種新型的驅動電路，用以實現超聲波電機的驅動和頻率的自動跟蹤。
  7. A 180mm lens is getting long for portraits and the canon ef 180mm f / 3. 5 l usm macro lens ' slow focusing might have an impact here as well

    而180拍人像則顯得略長了一些，同時180緩慢的對焦速度也不很適合人像拍攝。
  8. In tins paper, a new type of standing - wave linear usm with square - ring vibrator was presented, which had two contact surfaces and a support structure with four flexure hinges for the power output

    摘要利用有限元分析軟體對方環形直線駐波超聲波電動機的振子進行了動態設計，提出了一種環梁式雙接觸面的振子結構，該振子採用柔性鉸鏈與支撐結構連接，實現力的輸出。
  9. According to tusm ' s characteristic and it ' s driving theory, a kind of usm ' s driver and control strategy is designed in this paper, which is based on digital singal processor ( dsp ). the main work accomplished is summarized as follows

    設計了兩相混和式電動機的控制軟體，實現了電機轉速的開環控制，並同時給出了實驗結果，並對實驗結果進行了分析，驗證了上述模擬結果的正確性。
  10. Being a sort of new principle micromotor in the fronitier of science, the ultrasonic motor ( usm ) is developed at recently twenty years. utilizing the stator surface particle elliptical motion excited by piezoceeramics, the usm is drived by friction force between the stator and rotor

    本文以這一新型電動機為研究對象，對其運行特性和控制策略進行研究，是有較重要的理論和實際意義的。
  11. The influences of stator ' s teeth on vibrating modal of the linear standing wave usm are discussed in this paper, in which eigenfrequency and wave - shape are analyzed while the position and geometry dimension of stator ' s teeth are changed, and it can give some advice on design for standing wave linear ultrasonic motor

    摘要本文對一類直線型駐波超聲電機振子的振動模態進行了系統的分析，討論了定子齒的位置、幾何尺寸對直線型超聲電機的固有頻率、振型的影響，為該類駐波型直線超聲電機的設計提供了理論依據。
  12. The application of bp neural network to speed control system on usm is discussed, and a program is designed for training the bp neural network by matlab ’ s nntool, a three layers neural network of 2 - 8 - 1 is determined through simulation, then write the weights and biases of the nn into dsp to make on - line training, and it reaches the purpose of controlling usm ’ s speed

    利用matlab7 . 0中的神經網路工具箱進行結構設計和離線訓練，通過模擬實驗最終確定了2 - 8 - 1的三層網路結構，將訓練后得到的權值、閾值結果寫到dsp中，進行控制過程中給定速度的在線訓練，從而達到控制電機轉速的目的。
  13. The proposed driving circuit includes a low - pass filter circuit 、 feedback circuit 、 signal generated circuit 、 phase shifted circuit and power inverter circuit. a ti cooperation ' s dsp ( tms320lf2407a ) is chosen for the drive and control system based on the characteristics of usm, the interface circuit 、 each function ’ s flow chart and algorithm program are designed

    根據usm的特點，選取一款專用於電機控制的dsp晶元tms320lf2407a ，設計了硬體介面電路、各功能部分的流程圖及控制演算法程序，以ccs為編譯環境，進行電機整個控制系統的軟體編寫與調試。
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