【正文】 致謝本次畢業(yè)設(shè)計歷時三個多月，從選題、開題報告、復(fù)算過程到CAD繪制沖片圖、繞組圖，完成論文。在實際工作生產(chǎn)中，設(shè)計師會利用已有的定子沖片圖設(shè)計電機繞組，主要是因為這樣可以有效的節(jié)省設(shè)計步驟，充分的利用已有資源。通過ACR和AFR實行電流閉環(huán)控制，可使實際電流、以及跟隨其給定值變化，獲得良好的動態(tài)性能。暫先忽略定子電阻和漏抗的影響。通過對三個方案的選擇與計算，發(fā)現(xiàn)了幾條規(guī)律：第一條，要想省材料，可以增加每槽導(dǎo)體數(shù)，增加氣隙磁密，增加勵磁繞組電密；第二條，要想提高效率，請將第一條反過來執(zhí)行。這樣的變化使得電樞鐵心長變短，從而使得電機的各項材料用量減少，達到了節(jié)省材料的目的。電機基本尺寸D和有如下兩種方式確定：1. 計算法：①根據(jù)電機的額定功率,計算出計算功率P’；②根據(jù)P’,n選擇合適的電磁負荷A和,由公式得到；其中=，取 ；雙 ③根據(jù)P’,n查表（由系列，極數(shù)）得λ=/ , =；④由以上??中方程組可解得D，⑤查表的規(guī)定的D，2. 類比法（幾何相似定律）：取D1=D2得：（導(dǎo)線截面積S,繞線匝數(shù)分別成比例）（2）氣隙對電機性能的影響氣隙是指定子與轉(zhuǎn)子之間的空隙，在凸極同步電動機中，延電樞圓周方向氣隙磁場是不均勻分布的。因而在不計磁飽和時，可以根據(jù)雙反應(yīng)理論（一般情況下，如果電樞磁動勢既不作用于直軸、也不在交軸而在空間任意位置處，可以把電樞磁動勢分解成直軸與交軸兩個分量、再用對應(yīng)的直軸磁導(dǎo)與交軸磁導(dǎo)分別計算出直軸與交軸電樞磁通、然后把它們的效果疊加起來。轉(zhuǎn)子繞組：一般情況下轉(zhuǎn)子和磁場同速，無感應(yīng)電動勢。形成原因：電氣方式形成。在調(diào)相機方面，它可以向電網(wǎng)發(fā)出感性無功功率，滿足電網(wǎng)對無功功率的要求。隱極式轉(zhuǎn)子呈圓柱形，一般無明顯磁極。按照結(jié)構(gòu)形式分類，同步電機可分為旋轉(zhuǎn)電樞式和旋轉(zhuǎn)磁極式兩種。于是旋轉(zhuǎn)磁場帶動磁鐵轉(zhuǎn)動，速度為n=60f/p。除此以外，同步電動機還有一個突出的優(yōu)點，就是可以控制勵磁來調(diào)節(jié)它的功率因數(shù)，甚至超前。當同步發(fā)電機的轉(zhuǎn)速一定時，它發(fā)出的交流電動勢也是是固定的，這是因為，交流電動勢的頻率f決定于極數(shù)p和轉(zhuǎn)子的轉(zhuǎn)速n，即f=pn/60。同步電機用作電動機時，效率高且功率因數(shù)可調(diào)；而異步電機運行時必須從電網(wǎng)吸收無功勵磁功率，使電網(wǎng)功率因數(shù)變壞。端蓋的作用與異步電機基本相同，用于將電機本體的兩端封蓋起來，且與機座、定子鐵心和轉(zhuǎn)子一起構(gòu)成電機內(nèi)部完整的通風(fēng)系統(tǒng)。在發(fā)電機方面，同步電機擁有最廣泛的應(yīng)用，在現(xiàn)代電力系統(tǒng)中，幾乎所有的交流電都是由同步電機產(chǎn)生的。此外，電機銘牌還常列出額定勵磁電壓，額定勵磁電流, 額定溫升等參數(shù)。原因：旋轉(zhuǎn)磁場切割繞組。因此直軸磁阻比交軸磁阻小。（1）同步電動機主要尺寸確定在同步電動機設(shè)計之初，首先要進行主要尺寸的選擇，這影響到同步電動機很多重要的性能。檢查發(fā)現(xiàn)了很多問題并加以糾正，如公式的錯誤，角標的錯誤等等。因為，當每槽導(dǎo)體數(shù)增加為12時，這是不允許的，當然，還是比較幸運的。現(xiàn)忽略次要因素，做出如下假設(shè)：假設(shè)是隱極電機，或者忽略凸極的磁阻變化。轉(zhuǎn)速調(diào)節(jié)器ASR的輸出時轉(zhuǎn)矩給定信號，除以磁通模擬信號即得定子電流轉(zhuǎn)矩分量的給定信號，是磁通給定信號經(jīng)磁通滯后模型模擬其滯后效應(yīng)后得到的。允許用戶進行二次開發(fā)：Auto CAD自帶的Auto LISP語言讓用戶自行定義新命令和開發(fā)新功能。使我對科學(xué)研究的過程和方法，有了一個深刻的體會和了解。NANCHANG UNIVERSITY外文資料原文及譯文（2006—2010年） 學(xué) 院： 信息工程學(xué)院 系 電氣與自動化工程系 專 業(yè)： 電氣工程及其自動化 班 級： 電機電器062班 學(xué) 號： 6101106076 姓 名： 閆 永 佳 指導(dǎo)教師： 黃 劭 剛 起訖日期： ~ Deadtime Compensation of SVPWM Based on DSP TMS320F2812 for PMSMSong Xuelei*, Wen Xuhui, Guo Xinhua, and Zhao FengInstitute of Electrical Engineering, Chinese Academy of Sciences, Beijing, Email: songxlAbstract—The deadtime effect in a threephase voltage source inverter can result in voltage losses, current waveform distortion and torque pulsation. In order to improve the current waveform and decrease the torque pulsation, this paper proposes a deadtime pensation method of SVPWM. This method divides the iα iβ plane into six sectors and pensates the deadtime of SVPWM according to the sector number of stator current vector determined by the α and βaxis ponents of the stator current vector in the twophase static reference frame. In addition, this method can be implemented entirely through software without any extra hardware. Finally experiments based on DSP TMS320F2812 are established and made, and the experiment results indicate that the proposed method is correct and feasible.Index Termsdeadtime pensation,SVPWM,PMSM,TMS320F2812I. INTRODUCTIONBecause the permanent magnet synchronous machine (PMSM) has a lot of advantages such as high power density, high efficiency, high torque to inertia ratio, high reliability, et al[1],therefore, the PMSM driving system have been widely used in many application fields, especially in hybrid electric vehicles (HEV) in recentyears[2][6]. In the PMSM driving system, the threephase voltage source inverter is usually adopted and the IGBT and MOSFET are also used because of their fast switchingfrequency. For the threephase voltage source inverter, in order to avoid the short circuit of the dc link occurring when the two switch devices of the same phase are turned on simultaneously, the deadtime is usually inserted in the gate driving switch signals. During the duration of the deadtime, both of the two switch device of the same phase are turned off. The existing of the deadtime will lead to a series of deadtime effect problems such as voltage losses, current waveform distortion and torque pulsation, especially under the condition of small current or low speed.SVPWM (Space Vector Pulse Width Modulation) is a popular modulation method for threephase voltage source inverter in motor driving system. In order to improve the current waveform of motors and decrease the torque pulsation of motors, several deadtime pensation methods of SVPWM have been researched and used in the motor driving system[7][11]. Most of the pensation methods are based on the theory of average voltage deviation. In this paper, a novel deadtime pensation method of SVPWM, which is also based on the theory of average voltage deviation, is proposed. This method divides the iα iβ plane into six sectors and pensates the deadtime of SVPWM according to the stator current vector angle φ determined by the α and β axis ponents of the stator current vector in the α β reference frame. In addition, this method can be implemented entirely through software without any extra hardware design. Finally experiments are made on the PMSM driving platform based on DSP TMS320F2812 to test and verify the proposed pensation method.II. DEADTIME COMPENSATION METHOD shows the topology diagram of the PMSM driving system whose invert unit adopts the threephase voltage source inverter. In , Q1, Q2, Q3, Q4, Q5 and Q6 are six IGBTs of the threephase voltage source inverter, and D1, D2, D3, D4, D5 and D6 are their reverse parallel diodes respectively. In addition, the driving switch signals g1, g2, g3, g4, g5 and g6 are provided by the control unit of the driving system.Define the phase currents ia, ib and ic are positive when they flow from the inverter to PMSM, and negative when they flow from PMSM to the inverter. There are eight switch bination states for the six IGBTs in the threephase voltage source inverter, and during the duration of deadtime, there are correspondingly six current bination states for threephase currents ia, ib and ic according to their polarity:(1) ia0, ib0 and ic0。在此次同步電動機設(shè)計過程中，導(dǎo)師給我們提供了轉(zhuǎn)子沖片圖的樣板，根據(jù)計算出的數(shù)據(jù)就可以用AUTOCAD畫出圖形。它為工種設(shè)計人員提供了強有力的兩維和三維設(shè)計與繪圖功能。沿勵磁磁