【正文】 ................................................................................................................ 1 課題研究的目的及意義 ................................................................................... 1 感應(yīng)電機效率優(yōu)化研究的現(xiàn)狀 ....................................................................... 2 主要工作及章節(jié)安排 ...................................................................................... 4 第二章 直接轉(zhuǎn)矩控制的基本原理 ............................................................................. 6 感應(yīng)電機的數(shù)學(xué)模型 ....................................................................................... 6 定子電壓矢量的作用與定子磁鏈軌跡 ........................................................... 7 開關(guān)電壓矢量的合理選擇 ............................................................................. 11 開關(guān)電壓矢量查詢表 ........................................................................... 11 直接轉(zhuǎn)矩控制系統(tǒng)結(jié)構(gòu)圖 ............................................................................. 13 本章小結(jié) ......................................................................................................... 14 第三章 在線搜索控制效率優(yōu)化的方法 ................................................................... 15 單調(diào)遞減法 ..................................................................................................... 15 梯度法 ............................................................................................................. 16 黃金分割法 ..................................................................................................... 18 本章小節(jié) ........................................................................................................ 19 第四章 在線搜索效率優(yōu)化 Matlab 仿真 ................................................................. 20 基于 Matlab 的直接轉(zhuǎn)矩控制的建模 .......................................................... 20 仿真平臺的概述 ................................................................................... 20 MATLAB/SIMULINK 及其 Power System Blockset 工具箱簡介 21 感應(yīng)電機直接轉(zhuǎn)矩控制仿真模塊的建立 ..................................................... 22 感應(yīng)電機直接轉(zhuǎn)矩控制系統(tǒng)的仿真模型 ........................................... 22 考慮鐵損感應(yīng)電機的模塊 ................................................................... 22 3/2 電流和電壓仿真模型 .................................................................. 24 定子磁鏈仿真模型 ............................................................................... 25 南京工業(yè)大學(xué)本科生畢業(yè)設(shè)計（論文） V 速度控制仿真模型 ............................................................................... 26 單調(diào)遞減法效率優(yōu)化模型 ................................................................... 26 單調(diào)遞減搜索法的仿真結(jié)果及分析 ............................................................. 27 仿真結(jié)果 ............................................................................................... 27 仿真分析 ............................................................................................... 30 本章小結(jié) ......................................................................................................... 31 第五章 結(jié) 語 .......................................................................................................... 32 參考文獻(xiàn) ...................................................................................................................... 33 致謝 .............................................................................................................................. 35 南京工業(yè)大學(xué)本科生畢業(yè)設(shè)計（論文） 1 第一章 緒論 課題研究的目的及意義 感應(yīng)電機具有體積小、重量輕、成本低、堅固耐用、免維護(hù)等優(yōu)點，是電動汽車驅(qū)動電機極具競爭力的選擇。 仿真 結(jié)果證明這種方法 具有算法簡單、對電機參數(shù)變化魯棒性強的優(yōu)點 ，很好的提高電機運行效率 ?！包S金分割法”的收斂速度較快，但其磁鏈 的波動程度仍較大，因此本文采用 單調(diào)遞減法 來實現(xiàn)效率最優(yōu)化。上述上述效率優(yōu)化策略各具特色，但是不管哪一種方法，其本質(zhì)都是采用在輕載時降低電機磁通水平以減小鐵心損耗的方法實現(xiàn)效率的提升。 為了減小損耗本文采用在線搜索控制的方法來實現(xiàn)效率的最優(yōu)。 單調(diào)遞減 法在線搜索最小輸入功率運行點，依據(jù)這一事實，即輸入功率是定子磁鏈的凹函數(shù)，存在一個全局最優(yōu)點。 關(guān)鍵詞： 感應(yīng)電機 直接轉(zhuǎn)矩 控制 在線搜索 仿真 II Loss Minimization in ScalarControlled Induction Motor Drives with Search Controllers Abstract Induction motor variable frequency drive system efficiency optimization control has attracted wide attention from scholars, Existing methods can be divided into four categories: efficiency based on a simple state variable optimal control (SSC), the efficiency of searchbased optimal control method (SC), the efficiency loss model based on optimization of motor control (LMC), and with more than a few Ways characteristic mixture of optimal control (HC). The efficiency of the optimization strategies with different features, but no matter which method, and its essence is used at light loads, reducing the level of the motor flux method to reduce the core losses to achieve efficiency gains. To reduce the loss of this control method using online search to achieve the optimal efficiency. The current method of online search into three categories. The first hybrid DC minimum power line efficiency optimization control algorithms for fuzzy search (FLSC), the second golden section method, and the third gradient method. Golden Section of the convergence speed, but the volatility of the flux is still large, the gradient method used to achieve this efficiency optimization. Gradient Method to search for using the minimum input power operating point, based on the fact that the input power is the stator flux of the concave function, there is a global optimum. Algorithm along the direction of the input power decreases gradually increase or decrease the stator flux, determine the most advantage of the possible range, then change the search step until a terminating condition, we will achieve the most benefits .This method is both fast convergence and robustness of the parameters of the advantages of strong lines, is a quite promising strategy for induction motor efficiency optimization control. Simulat