高動(dòng)態(tài)品質(zhì)送絲機(jī)驅(qū)動(dòng)電源的設(shè)計(jì)

摘    要

送絲機(jī)是熔化極氣體保護(hù)焊系統(tǒng)的重要組成部分。熔化極氣體保護(hù)焊焊接工藝過(guò)程穩(wěn)定性和焊縫成形、質(zhì)量與送絲系統(tǒng)的穩(wěn)定性和可靠性有著直接的關(guān)系。針對(duì)熔化極氣體保護(hù)焊對(duì)送絲系統(tǒng)提出的高要求，特別是脈動(dòng)送絲所需的更高的響應(yīng)速度。本文采用了具有橋式結(jié)構(gòu)的PWM直流電機(jī)轉(zhuǎn)速控制系統(tǒng)，依靠NE555單穩(wěn)態(tài)定時(shí)器和依橋式PWM控制系統(tǒng)所能提供的反接制動(dòng)功能，使上升和下降速度滿足設(shè)計(jì)指標(biāo)要求，并設(shè)計(jì)出滿足設(shè)計(jì)要求的高動(dòng)態(tài)品質(zhì)送絲驅(qū)動(dòng)系統(tǒng)，對(duì)于提高熔化極氣體保護(hù)焊采用脈動(dòng)送絲系統(tǒng)的焊接性能具有一定的理論意義和實(shí)際價(jià)值。

關(guān)鍵詞：直流電機(jī)，驅(qū)動(dòng)，高動(dòng)態(tài)品質(zhì)，PWM控制
 

ABSTRACT

Wire feeder is a important part of a Gas Metal Arc Welding(GMAW) system.     GMAW welding process of stability , seam shape and quality has a direct relationship to the wire feeding system’s stability and reliability. Against the high demand to a GMAW wire feeder system , especially the pulse of wire feeding the higher response rate. In this paper, author used the structure of a bridge PWM DC motor speed control system, relying on the steady-state NE555 single-timer and control system under Bridge PWM available converse brake function, so that rise and fall speed indicator to meet design requirements, and Designed to meet the design requirements of high-quality wire feeding dynamic drive system for raising a GMAW wire feeding system using pulse of the welding performance has a theoretical and practical value.

Key words: DC motor,draving,high dynamic quality,PWM contorl

目錄
摘    要 I
ABSTRACT II
1  緒論 1
1.1引言 1
1.2 熔化極氣體保護(hù)焊送絲機(jī)的技術(shù)發(fā)展現(xiàn)狀 1
1.3印制電機(jī)的特點(diǎn)及分類 3
1.3.1印制電機(jī)的特點(diǎn) 3
1.3.2 印制電機(jī)的分類 4
1.4高動(dòng)態(tài)品質(zhì)送絲機(jī)驅(qū)動(dòng)電源的提出 4
2  總體設(shè)計(jì)方案 6
2.1 PWM調(diào)速的基本原理 6
2.2高動(dòng)態(tài)品質(zhì)送絲驅(qū)動(dòng)電源系統(tǒng)的組成及工作原理 7
3  單元電路結(jié)構(gòu)原理及其設(shè)計(jì)計(jì)算 10
3.1脈寬調(diào)制型功放電路 10
3.2光電轉(zhuǎn)速信號(hào)整形電路 12
3.3頻率電壓轉(zhuǎn)換電路 14
3.3.1 LM331工作原理 14
3.3.2電路參數(shù)設(shè)計(jì) 16
3.4 以TL494為控制核心的轉(zhuǎn)速閉環(huán)控制電路的結(jié)構(gòu)原理及其設(shè)計(jì) 17
3.4.1 TL494型控制器的內(nèi)部結(jié)構(gòu)和工作原理 17
3.4.2電路設(shè)計(jì) 20
3.5提高脈動(dòng)送絲時(shí)轉(zhuǎn)速相應(yīng)速度的加速控制電路 21
3.5.1 NE555定時(shí)器電路結(jié)構(gòu)及工作原理 22
3.5.2用555 定時(shí)器構(gòu)成的單穩(wěn)態(tài)觸發(fā)器 23
3.5.3電路設(shè)計(jì) 24
3.6轉(zhuǎn)速給定電路 26
4  結(jié)論 29
參考文獻(xiàn) 30
附錄：高動(dòng)態(tài)品質(zhì)送絲機(jī)驅(qū)動(dòng)電路圖 31
致謝 32