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畢業(yè)設計中頻感應加熱電源的設計-全文預覽

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【正文】 2 Design of Induction heating power of medium frequency Abstract Induction heating power is equipped with lots of advantages such as high heating efficiency, fast speed ,good controllability, which is prone to make heating of high and partial temperature , and realize mechanization and automation. At present metal melting, work piece heat peration, quenching, welding, casting, elbow piece, surface heating processing has been widely applied. Induction heating of medium frequency and development, current situation, and tendency related technology has been studied, and have made quite prehensive and in the profound elaboration foundation, this article has carried on the design to main circuit and the inversion control of the rectifier intermediate frequency induction heating power. This design is used for big facility of mechanical heating processing. Structure of rectification circuit is easy, which makes power popularized easily. Threephase bridge rectification circuit is used in Rectification circuit. Rectification circuit uses feedback control of two closed loop, improving the disadvantages. The foundation for inventing induction heating power of big power and super audio is made. Key words: Controllable silicon medium power Induction heating Inverter Protect circuit 3 目 錄 .............................................................. 4 感應加熱電源的特點和應用 .................................... 4 感應加熱電源的發(fā)展階段 ...................................... 4 感應加熱電源發(fā)展的主要因素 .................................. 5 感應加熱電源的發(fā)展趨勢 ...................................... 5 ...................................................... 6 基本工作原理 ................................................ 6 基本結構 .................................................... 7 ...................................................... 8 整流電路的分類 .............................................. 8 整流電路的選擇 .............................................. 8 三相橋式全控整流電路 ........................................ 9 整流電路的參數設計 .......................................... 11 ..................................................... 12 控制電路系統的概述 ......................................... 12 控制電路的結構與原理 ....................................... 12 控制電路的作用 ............................................. 14 控制策略 ................................................... 14 控制觸發(fā)回路頻率跟蹤調節(jié) ................................... 18 觸發(fā)要求 .............................................. 18 頻率跟蹤電路 .......................................... 18 過流和過壓的保護電路 ....................................... 19 論 ............................................................ 20 致 謝 .............................................................. 21 參考文獻 ........................................................... 22 4 感應加 熱電源的特點和應用 感應加熱是根據電磁感應原理,利用工件中渦流產生的熱量對工件進行加熱的。 本科畢業(yè)論文(設計) 中頻感應加熱電源的設計 (整流電路控制電路的設計) 學生姓名: 所在院(系): 機電學院 所學專業(yè): 機械設計制造及其自動化 導師姓名: 完成時間: 1 摘 要 感應加熱電源具有 加熱效率高,速度快,可控性好,易于實現高溫和局部加熱,易于實現機械化和自動化等優(yōu)點 ,目前已在金屬熔煉、工件透熱、淬火、焊接、鑄造、彎管、表面熱處理等行業(yè)得到了廣泛的應用。整流電路采用三相橋式全控整流電路,其電路結構簡單,使電源易于推廣;控制策略選用雙閉環(huán)反饋控制系統,改善了信號遲滯的缺點,為以后研制大功率、超音頻的感應加熱電源打下了基礎。在鑄造方面,正在迅速發(fā)展雙聯熔煉工藝,即利用中頻爐保溫改性,進行球墨鐵或合金鋼的精密澆鑄;在鍛造方面,利用感應加熱實現快速透熱熱鍛,其材料利用率可達 85%,鍛件表面光潔度可小于 50μ m;在焊接,淬火方面,國外一方面致力于開發(fā)大功率全 固態(tài)高頻電源,一方面致力于開發(fā)高度自動化的熱處理成套處理系統。這項改造工程不但涉及到保溫爐的設計制造,雙聯熔煉工藝的最佳化控制系統設計,還涉及到大功率中頻感應加熱電源等。 感應加熱電源的發(fā)展階段 ( 1)在 50 年代前,感應加熱電源主要有 :工頻感應熔煉爐,電磁倍頻器,中頻發(fā)電機組和電子管振蕩器式高頻電源。在高頻范圍內,由于晶閘管本身開關特性等參數的限制,給研制該頻段的電源帶來了很大的技術難度,它必須通過改變電
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