臺灣博碩士論文加值系統

本文電動輔助自行車採用管式中置電機系統，管式中置電機系統主要是由馬達、控制器、電池、齒輪箱組成並設置於自行車車架中段下管中。因電機本身效率問題相較於五通式電機系統，管式中置電機系統需要在有限空間內整合多樣零件，其緊湊結構配置導致通風散熱條件較差，造成管式中置電機系統內部零件溫升過高，將嚴重影響管式中置電機系統在運轉過程中之可靠性以及使用者的安全。為了確保管式中置電機系統之可靠性以及使用者的安全，因此建置一套電動輔助自行車管式中置電機散熱系統。本文以管式中置電機系統散熱路徑為研究對象，建置一套電動輔助自行車管式中置電機散熱系統，其中考慮了自行車在正常騎行以及額定條件情況下熱傳導、熱輻射以及熱對流等因素，利用ANSYS Workbench分析軟體根據熱傳學對管式中置電機系統作熱傳遞分析，並對分析結果溫度場進行研究後，在初始條件不變的情況下以管式中置電機系統結構幾何為研究對象，提出散熱優化方案，經過單因素熱傳遞分析後，分別採用散熱能力最佳之管式中置電機系統內部零件結構幾何分別進行熱傳遞分析以及為了模擬電動輔助自行車在騎行中與外部空氣撞風產生熱交換之流體動力分析，並利用ANSYS Workbench作流固熱耦合熱傳遞和流體動力分析結果，經過耦合分析後，在穩態情況下此散熱系統能有效提升管式中置電機系統內部零件散熱能力，建置一套完整的電動輔助自行車管式中置電機散熱系統，透過散熱系統的建立，提供給設計者在未來設計結構幾何時，能開發出擁有更好散熱能力的產品。

This study presents the development of a heat dissipation system for E-Bikes equipped with a tube mid-drive motor system. The tube mid-drive motor system consists of a motor, controller, battery, and gearbox, which are integrated into the mid-section of the bicycle frame. Compared to the hub motor system, the tube mid-drive motor system faces challenges in terms of its efficiency and the integration of multiple components within limited space. The compact structure of the system results in poor ventilation and inadequate heat dissipation, leading to excessive temperature rise of internal components, which significantly affects the reliability of the tube mid-drive motor system and compromises user safety. To ensure system reliability and user safety, a comprehensive heat dissipation system is developed for the tube mid-drive motor system in E-Bikes.This study focuses on the heat dissipation path of the tube mid-drive motor system and establishes a heat dissipation system specifically designed for E-Bikes. The system considers heat conduction, heat radiation, and heat convection factors under normal riding and rated conditions. ANSYS Workbench software is used to analyze heat transfer within the tube mid-drive motor system based on heat transfer principles. The temperature distribution within the system is investigated. Furthermore, an optimization approach is proposed to enhance the heat dissipation performance by optimizing the geometric design of internal components. Single-factor heat transfer analyses are conducted to evaluate the thermal performance of the optimized system. Additionally, fluid dynamics analysis is employed to simulate the heat exchange resulting from the interaction between the E-Bike and the external airflow. The coupled thermal-fluid analysis results obtained using ANSYS Workbench validate the effectiveness of the proposed heat dissipation system under steady-state conditions. The findings of this study demonstrate that the established heat dissipation system effectively improves the heat dissipation capacity of the tube mid-drive motor system. This comprehensive heat dissipation system provides valuable insights for designers to develop products with superior heat dissipation capabilities by considering the geometric design of the system.

摘要......i
Abstract......ii
誌謝......iv
目錄......v
表目錄......viii
圖目錄......ix
第一章 緒論......1
1.1 研究動機與目的......1
1.2 文獻探討......1
1.3 研究方法與流程......3
1.3.1 研究方法......3
1.3.2 研究流程......3
1.4 本文架構......5
第二章 電動輔助自行車管式中置電機散熱系統介紹......6
2.1 電動輔助自行車規範......6
2.2 電動輔助自行車結構組成......7
2.3 電動輔助自行車中置電機系統介紹......8
2.4 管式中置電機散熱系統分析模型相關原理......10
2.4.1 熱傳遞分析原理......10
2.4.2 流體動力分析原理......12
2.5 本章總結......13
第三章 管式中置電機散熱系統分析模型建立......14
3.1 管式中置電機系統初始物理模型建立......14
3.2 管式中置電機系統熱傳遞分析初始模型建立......15
3.2.1 初始條件設置......15
3.2.2 熱傳遞路徑......16
3.2.3 邊界設定......16
3.2.4 網格劃分......18
3.2.5 熱傳遞模擬分析結果......18
3.3 管式中置電機系統流體動力分析模型建立......22
3.3.1 管式中置電機系統流體區域建立......22
3.3.2 網格劃分......23
3.3.3 湍流模型選擇......23
3.3.4 邊界設定......25
3.3.5 流體動力分析結果......25
3.4 本章總結......25
第四章 管式中置電機系統散熱優化設計......28
4.1 散熱鰭片的研究......28
4.1.1 鰭片結構熱傳遞分析......28
4.1.2 鰭片結構熱傳遞分析結果......30
4.2 管式中置電機系統內部電池結構散熱優化......32
4.2.1 電池結構優化熱傳遞分析......34
4.2.2 電池結構優化熱傳遞分析結果......35
4.3 管式中置電機系統下管殼體散熱優化......38
4.3.1 下管殼體結構散熱優化熱傳遞分析......38
4.3.2 下管殼體結構散熱優化熱傳遞分析結果......41
4.4 管式中置電機系統流固熱耦合分析......44
4.4.1 管式中置電機系統流固熱耦合分析結果比對......45
4.5 本章總結......51
第五章 結論與未來展望......52
5.1 結論......52
5.2 未來展望......53
參考文獻......54
Extended Abstract......56
1. Introduction......57
2. Research methods......57
3. Conclusion......58

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