內藏式永磁無刷馬達於電動機車應用分析

Analysis of Internal Permanent Magnet Brushless Motors in Electric Scooter Applications

黃俊維(Chun-Wei Huang)

指導教授 ： 王培仁

國立清華大學/電機資訊學院/光電科技產業研發碩士專班/碩士(2009年)

摘要

電動機車的使用，在石油日漸吃緊的環境下越來越受到重視與使用，許多機車的生產公司都已投入研發甚至量產電動機車，在未來電動機車會成為一個方便的交通工具、一個乾淨的綠色能源。本論文針對一種高效能、低價及輕便性的電動機車馬達，嘗試設計出高效率的內藏式永磁直流無刷馬達為主要研究課題。本文採用高效能釹鐵硼(NdFeB)磁鐵，利用其高磁能積、高殘磁、高矯頑磁力等特性，提高馬達內氣隙磁通密度，並利用磁阻力矩來降低馬達重量與體積。研究過程中先收集電動機車的規格，用理論分析進行馬達的尺寸設計，使用經驗公式算出馬達各項基本尺寸，最後再利用電腦輔助磁路分析，以有限單元法進行模擬馬達二維磁場分布的情形。設計出一個優化之內藏式永磁直流無刷馬達，經過細部尺寸探討，並以模擬電腦軟體比較其優缺點後，期能得到滿足設計目標所需求的電動機車驅動馬達。

關鍵字

內藏式永磁馬達 ； 電動機車

並列摘要

As the oil shortage is worsening gradually, electric scooters are attracting more attention and getting more popular in application. Many companies started research projects and even production of these scooters. Hence, electric scooters will become a transportation tool with convenience and green energy considerations. In this thesis, a high-performance, low-cost and compact electric motor would be investigated for the electric scooters. The objective is to study and design a highly efficient brushless DC motor with internal permanent magnets which are high-performance NdFeB magnets. The magnets are high in energy, magnetic retentivity, and coercivity so that the air-gap magnetic flux density inside the motor can be increased. With the goal for utilization of reluctance torque to reduce the weight and volume, this study first gathered the specifications of the scooters; and then, we design the motors based upon fundamental formulae for the sizes of the motors. We further used computer simulation tools for analysis of the magnetic circuit in details. Finally, we finished the design with data from two-dimensional magnetic field distributions of many cases with optimized parameters of the motors. By exploring the details and comparing the pros and cons from the simulations, we concluded that the design goals for electric motors in application for electric scooters have been met.

並列關鍵字

Internal Permanent Magnet Motor ； Electric Scooter

參考文獻

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