【導(dǎo)讀】團體和國主權(quán)和獨立的象征，就有重大的意義。舉行升降旗儀式是對每。個公民進行愛國主義教育、國旗意識教育，團體意識教育的重要途徑；程度上也成為衡量國民素質(zhì)的重要標準。種形式，而是一項十分莊重、嚴肅的活動。五星紅旗是中華人民共和國。尊敬國旗體現(xiàn)著維護國家的尊嚴。嚴格按照《中華人民共和國國旗法》要求升降國旗。儀式使學(xué)生受到直接的愛國主義教育，增強國家和民族觀念。旗儀場面變得難堪。隨著科技的進步，自動系統(tǒng)的廣泛發(fā)展，以及升降旗存在的問題，自動系統(tǒng)也逐漸的應(yīng)用到升降旗上，且具有較強的應(yīng)用性。了升旗儀式的嚴肅性和莊重性[1]。

　　

【正文】 ，該系統(tǒng) 實現(xiàn)了這幾項 功能 ： (1)撥動 上升鍵 ，國旗勻速上升，同時演奏國歌 ， 上升到最高點時，自動停止，國歌停止播放 。撥動 下鍵后，國旗勻速下降， 下降到最低端時自動停止； (2)在升降旗過程中，實時的檢測升降高度，且與實際高度最大不超過 3cm； (3)升降旗過程的時間都統(tǒng)一為 43 秒，與國歌時間一致 ； (4)能 夠?qū)崿F(xiàn)降半旗的功能； (5)能夠?qū)Σ竭M電機速度進行調(diào)節(jié)。 但是， 還 存在 需要改進的地方 ：一方面， 開關(guān)太小，不易撥動， 且 沒 能形成遠程無線控制； 另一方面， 電路也不太穩(wěn)定，干擾太大。 陜西理工學(xué)院畢業(yè)設(shè)計 第 40 頁 共 54 頁 陜西理工學(xué)院畢業(yè)設(shè)計 第 41 頁 共 54 頁 參考文獻 [1] 于永 .51 單片機 C 語言常用模塊于綜合系統(tǒng)設(shè)計實例精講 [M].北京：電子工業(yè)出版社 ,2020： 8894. [2] 盧洪武 ， 劉偉 ， 孫梅梅 .國旗自動控制升降系統(tǒng)的研制 [J] .電子技術(shù) .2020:(1):1721. [3] 張超 ， 譚靜芳 ， 高秀美 等 .自動控制升降旗系統(tǒng) [J]. 現(xiàn)代電子技術(shù) , 2020,(11):115119 [4] 趙 芝齡， 劉濤，陸軍等 .自動控制升降旗系統(tǒng) [J].硅谷， 2020,（ 14） :1718 [5] 唐俊杰 ,高秦生 . 微型計算機原理及應(yīng)用 [M].北京：高等教育出版社，1993:60150 [6]丁海峰，陳云 .一種單片機結(jié)合 CPLD 自動控制升降旗系統(tǒng) [J].安徽電子信息職業(yè)技術(shù)學(xué)院 學(xué)報， 2020,（ 3）： 4344 [7] 張毅剛 .單片機原理及應(yīng)用 [M].北京：高等教育出版社 ,2020： 220250 陜西理工學(xué)院畢業(yè)設(shè)計 第 42 頁 共 54 頁 [8] 馬立修，潘金鳳，姜淳琳 等 . 自動控制升降旗系統(tǒng)的設(shè)計 [J].電子制作， 2020， 154（ 1）： 2123. [9] 盧洪武，郇玉龍，趙寧 . 國旗升降控制系統(tǒng)的設(shè)計與實現(xiàn) [J].電子制作， 2020， 157（ 4）： 3032. [10] 張立科 .單片機典型模塊設(shè)計實例導(dǎo)航 [M].北京：人民郵電出版社 ,2020:2090 [11]吳興波，劉長升，榮志強 .基于 MSP430F449 升降器系統(tǒng)的設(shè)計 [J].吉林化工學(xué)院學(xué)報， 2020，（ 3） :1516 [12]王志水 .自動控制升降旗系統(tǒng) [J]. 電腦知識與技術(shù)：學(xué)術(shù)交流 ， 2020，（ 1）： 158160 [13]孫偉，楊福剛 .基于 MC9S12DG128 單片機的自動升降旗系統(tǒng)設(shè)計 [J].電子測量技術(shù)， 2020，（ 8） :167170 [14] . Weerakoon and L. Samaranayake. Development of a Novel Drive Topology for a Five phase Stepper Motor[M],Proceedings of 11th International Conference on Eletrical Machines and Systems ,2020. [15]R 。 Jacobson, ,Readout supervisor design specifications[M], LHCb [16], report on the RD12 project:timeing,trigger and control system for LHC detectors[J] Time and technology,2020，(3):152155 陜西理工學(xué)院畢業(yè)設(shè)計 第 43 頁 共 54 頁 附錄 A 英 文文獻 原文 陜西理工學(xué)院畢業(yè)設(shè)計 第 44 頁 共 54 頁 Development of a Novel Drive Topology for a Five Phase Stepper Motor . Weerakoon and L. Samaranayake （ Dept. of Electrical and Electronic Engineering, Faculty of Engineering, University of Peradeniya, Sri Lanka） [Abstract] In this paper, a novel drive topology for a five phase stepper motor is described in detail. Commercially off the shelf, low cost, standard stepper motor drive ICs are used to derive a novel drive topology for five phase stepper motors which enables closed loop speed and position control powered by inner current control loop. It is proved that the derived topology can be generalized to any stepper motor with higher odd number of phases. The designed driver consists of full step, half step, clockwise and counter clockwise drive modes with the speed control and current control. [key words] Fivephase stepper motor, the return drive, speed control, multimode I. INTRODUCTION In most of the robotics and automation engineering designs various types of stepper motors are used to obtain the required motion profiles. Stepper motors are preferred, as they do not require frequent maintenance and due to their ability to operate in many harsh 陜西理工學(xué)院畢業(yè)設(shè)計 第 45 頁 共 54 頁 environments. Selection of the motors and their drive circuits depend on the required performance characteristics of the applications. The two phase and four phase stepper motors are the most mon types available in the market. However, for applications requiring high precision, low noise and lower vibration, Five Phase Stepper Motors are used. Due to smaller step angle, five phase stepper motors offer higher resolution, lower vibration and higher accelerations and decelerations. Therefore it is essential to make sure that these motor characteristics can be obtained from the designed drive topology. Because the five phase stepper motors are a rarely used type in the robotic applications and the construction is typically plicated, it is very difficult to find driver ICs, which are manufactured exclusive for them. As a result, the available Driver circuits for five phase stepper motors are very expensive. Using the available drive control ICs manufactured for mon kinds of stepper motors such as 2 phased and 4 phased and using them in modeling new driver topology for other stepper motors would be a cost effective approach. The IC L297 integrates all the control circuitry required to control bipolar and unipolar stepper motors. The L298N dual H bridge drive forms a plete microprocessor to stepper motor interface. 陜西理工學(xué)院畢業(yè)設(shè)計 第 46 頁 共 54 頁 Here, novel drive topology is investigated and developed for five phase stepper motors by adding a microprocessor and logical control system with L297 and L298N. The plete topology is described in this paper. Section II explains the ponent characteristics. Section III is on the control logic circuit design phenomena. The interface design is given in Section IV with results in Section V. Finally the conclusions are presented in Section VI. II. CHARACTERISTIC ANALYSIS OF MAIN COMPONENTS The IC L297 can be used with an H bridge driver IC for motor drive applications as shown in . In this design H bridge function is achieved from the L298N or L293E. This may change depending on the power rating of the motor. The control signals to the L297 may be received from microcontroller or from external switches. A single IC can drive a 2 phase bipolar permanent mag motor, a 4 phase unipolar permanent mag motor or a 4 phase variable reluctance motor. Because very few electronic ponents are used, it has many advantages such as lower cost, higher reliability and the ability to house in a paratively smaller space. The L297 generates three modes of phase sequences, namely half step mode, full step mode and wave mode depending on the input signals it receives. 陜西理工學(xué)院畢業(yè)設(shè)計 第 47 頁 共 54 頁 H A L F / F U L L1 9C W / C C W1 7C L O C K1 8H O