摘 要
在電氣時代的今天，電動機在工農(nóng)業(yè)生產(chǎn)、人們?nèi)粘Ｉ钪衅鹬种匾淖饔?。直流電機是最常見的一種電機，在各領(lǐng)域中得到廣泛應(yīng)用。研究直流電機的控制和測量方法，對提高控制精度和響應(yīng)速度、節(jié)約能源等都具有重要意義。電機調(diào)速問題一直是自動化領(lǐng)域比較重要的問題之一。不同領(lǐng)域?qū)τ陔姍C的調(diào)速性能有著不同的要求，因此，不同的調(diào)速方法有著不同的應(yīng)用場合。
本文基于PWM的雙閉環(huán)直流調(diào)速系統(tǒng)進行了研究，并設(shè)計出應(yīng)用于直流電動機的雙閉環(huán)直流調(diào)速系統(tǒng)。首先描述了變頻器的發(fā)展歷程，提出了PWM調(diào)速方法的優(yōu)勢，指出了未來PWM調(diào)速方法的發(fā)展前景，點出了研究PWM調(diào)速方法的意義。應(yīng)用于直流電機的調(diào)速方式很多，其中以PWM變頻調(diào)速方式應(yīng)用最為廣泛，而PWM變頻器中，H型PWM變頻器性能尤為突出，作為本次設(shè)計的基礎(chǔ)理論，本文將對PWM的理論進行詳細論述。在此基礎(chǔ)上，本文將做出SG3525單片機控制的H型PWM變頻調(diào)速系統(tǒng)的整體設(shè)計，然后對各個部分分別進行論證，力圖在每個組成單元上都達到最好的系統(tǒng)性能。


關(guān)鍵詞：直流調(diào)速 ；雙閉環(huán) ；PWM ；SG3525 ；直流電機



DC-drive speed system with PWM

ABSTRACT

In electrical time's today, the electric motor in the industry and agriculture production, the people daily life is playing the very vital role. The direct current machine is the most common one kind of electrical machinery, obtains the widespread application in various domains. The research direct current machine's control and the measuring technique, to increase the control precision and the speed of response, the frugal energy and so on have the important meaning. A problem about speed-modulation of DC motor is very important in the field automatic. The requests to the effect after the speed-modulation of the DC motor are different in different fields. Then, different speed-modulation ways are using in different fields.
This paper researches DC-drive speed system with a dual-converter and dual-closed-loop based PWM, discussing a new control method that combines PWM with D C-drive, designs applies in direct current motor's double closed loop current velocity modulation system. DC motor is used very generally because its speed-modulation effect is very good and its speed-modulation is easily to be realized. PWM theory is used most generally among the speed-modulation ways. The text will introduce the H-PWM way mostly. We will try to do modulation to the DC motor with SG3525. The importance of the text is the parts which are composed the system. Another importance is the principles of working about every parts.


Key word: DC speed regulation ；Double-loop ；PWM ；SG3525；DC moter；




目 錄
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