臺灣博碩士論文加值系統

本論文主要目的是研製一換向相位超前無刷直流馬達驅動器，目的在改善無刷直流馬達的漣波轉矩及提高驅動器的效率。無刷直流馬達在運轉特性上，傳統用於驅動無刷直流馬達的驅動法會因馬達定子繞組本身具有的電感性，造成電流相位會稍落後馬達反電勢，此現象導致運轉時會出現輸出較不平順的輸出轉矩，解決方法是藉反流器提前切換將電流相位適當超前，希望使之與反電勢同相位。因此本文提出一種換向相位超前切換控制方法，在不同轉速下根據馬達參數計算出適合的換向相位超前角度，提供適當的驅動信號控制反流器功率晶體切換，達到控制電流相位超前的目的。本研究在實體電路方面，控制核心採用德州儀器公司開發的數位訊號處理器(DSP TMS320LF2407A)，硬體電路為一閘極驅動電路與一三相全橋式反流器組成，所完成的驅動器實際驅動一顆8 極的內嵌式無刷直流電動機，在相同負載與轉速下及馬達全速運轉時，以一般傳統驅動方法及所提換向超前驅動法做實驗，比較實驗結果發現所提切換法具有降低直流鏈電流平均值與電流峰值的效果。

In order to improve the torque ripple and drive efficiency, the major purpose of this thesis is to design and implement a phase advanced commutation scheme for brushless DC (BLDC) motor drives. In BLDC characteristic, when a BLDC motor is operated by
using the general switching scheme, the phase current will lag the back-EMF. It will result in more torque ripple as well as reduce output power. Hence a proper phase advanced commutation scheme may be adopted to improve the performance of BLDC motor drives. The proposed scheme can generate proper phase advanced signal according to rotor speed and some machine parameters. The control algorithm is implemented by using a digital signal processor (DSP TMS320LF2407A). The hardware circuit is composed of a gate driver circuit and a full bridge inverter. The experimental results show that the proposed control scheme, under the same load condition and rotor speed, has the smaller average DC link current and peak to peak current amplitude than these of the general switching scheme.

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
第一章 緒論 1
1.1 研究背景與動機 1
1.2 文獻回顧 2
1.3 論文架構 4
第二章 無刷直流馬達模型及驅動特性 5
2.1 前言 5
2.2 無刷直流馬達的基本構造與種類 5
2.3 無刷直流馬達數學模型 8
2.4 無刷直流馬達的驅動特性 10
第三章 無刷直流馬達驅動控制策略比較 17
3.1 前言 17
3.2 單臂波寬調變 17
3.3 單臂交錯型波寬調變 20
3.4 互補型波寬調變 22
第四章 換向相位超前控制 27
4.1 前言 27
4.2 換向相位超前原理 28
4.3 系統方塊圖與控制流程圖 31
第五章 硬體架構與實驗結果 34
5.1 前言 34
5.2 數位訊號處理器簡介與軟體系統規劃 34
5.3 閘極驅動電路 38
5.4 驅動器硬體架構 40
5.5 實驗結果波形 41
第六章 結論與未來研究方向 50
參考文獻 52

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