【導(dǎo)讀】團(tuán)體和國(guó)主權(quán)和獨(dú)立的象征，就有重大的意義。舉行升降旗儀式是對(duì)每。個(gè)公民進(jìn)行愛(ài)國(guó)主義教育、國(guó)旗意識(shí)教育，團(tuán)體意識(shí)教育的重要途徑；程度上也成為衡量國(guó)民素質(zhì)的重要標(biāo)準(zhǔn)。種形式，而是一項(xiàng)十分莊重、嚴(yán)肅的活動(dòng)。五星紅旗是中華人民共和國(guó)。尊敬國(guó)旗體現(xiàn)著維護(hù)國(guó)家的尊嚴(yán)。嚴(yán)格按照《中華人民共和國(guó)國(guó)旗法》要求升降國(guó)旗。儀式使學(xué)生受到直接的愛(ài)國(guó)主義教育，增強(qiáng)國(guó)家和民族觀念。旗儀場(chǎng)面變得難堪。隨著科技的進(jìn)步，自動(dòng)系統(tǒng)的廣泛發(fā)展，以及升降旗存在的問(wèn)題，自動(dòng)系統(tǒng)也逐漸的應(yīng)用到升降旗上，且具有較強(qiáng)的應(yīng)用性。了升旗儀式的嚴(yán)肅性和莊重性[1]。

　　

【正文】 ，該系統(tǒng) 實(shí)現(xiàn)了這幾項(xiàng) 功能 ： (1)撥動(dòng) 上升鍵 ，國(guó)旗勻速上升，同時(shí)演奏國(guó)歌 ， 上升到最高點(diǎn)時(shí)，自動(dòng)停止，國(guó)歌停止播放 。撥動(dòng) 下鍵后，國(guó)旗勻速下降， 下降到最低端時(shí)自動(dòng)停止； (2)在升降旗過(guò)程中，實(shí)時(shí)的檢測(cè)升降高度，且與實(shí)際高度最大不超過(guò) 3cm； (3)升降旗過(guò)程的時(shí)間都統(tǒng)一為 43 秒，與國(guó)歌時(shí)間一致 ； (4)能 夠?qū)崿F(xiàn)降半旗的功能； (5)能夠?qū)Σ竭M(jìn)電機(jī)速度進(jìn)行調(diào)節(jié)。 但是， 還 存在 需要改進(jìn)的地方 ：一方面， 開(kāi)關(guān)太小，不易撥動(dòng)， 且 沒(méi) 能形成遠(yuǎn)程無(wú)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(jì) 第 40 頁(yè) 共 54 頁(yè) 陜西理工學(xué)院畢業(yè)設(shè)計(jì) 第 41 頁(yè) 共 54 頁(yè) 參考文獻(xiàn) [1] 于永 .51 單片機(jī) C 語(yǔ)言常用模塊于綜合系統(tǒng)設(shè)計(jì)實(shí)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(guó)旗自動(dòng)控制升降系統(tǒng)的研制 [J] .電子技術(shù) .2020:(1):1721. 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[10] 張立科 .單片機(jī)典型模塊設(shè)計(jì)實(shí)例導(dǎo)航 [M].北京：人民郵電出版社 ,2020:2090 [11]吳興波，劉長(zhǎng)升，榮志強(qiáng) .基于 MSP430F449 升降器系統(tǒng)的設(shè)計(jì) [J].吉林化工學(xué)院學(xué)報(bào)， 2020，（ 3） :1516 [12]王志水 .自動(dòng)控制升降旗系統(tǒng) [J]. 電腦知識(shí)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(jī)的自動(dòng)升降旗系統(tǒng)設(shè)計(jì) [J].電子測(cè)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(jì) 第 43 頁(yè) 共 54 頁(yè) 附錄 A 英 文文獻(xiàn) 原文 陜西理工學(xué)院畢業(yè)設(shè)計(jì) 第 44 頁(yè) 共 54 頁(yè) 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(jì) 第 45 頁(yè) 共 54 頁(yè) 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(jì) 第 46 頁(yè) 共 54 頁(yè) 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(jì) 第 47 頁(yè) 共 54 頁(yè) H A L F / F U L L1 9C W / C C W1 7C L O C K1 8H O