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永磁無刷馬達電磁力與振動之研究

Research on magnetic forces and vibration of permanent magnet brushless motors

作者:陳航生
畢業學校:國立成功大學
出版單位:國立成功大學
核准日期:2009-11-17
類型:Electronic Thesis or Dissertation
權限:Copyright information available at source archive--National Cheng Kung University....

中文摘要

近年來,隨著人們對生活品質的要求提昇,創造舒適的生活空間一直是家電與馬達業者所努力的目標,而馬達之振動噪音也因此逐漸受到重視。本論文針對電磁力對於永磁無刷馬達振動之影響進行研究,包含四個主要的研究議題,分別為:一、切線電磁力;由於切線方向電磁力之擾動易造成輸出轉矩不穩定,進而形成轉矩漣波、造成馬達振動。本項研究針對永磁無刷馬達之反電動勢波形,進 行實測與分析,並提出雙段(Two-segment)轉子結構,可降低頓轉扭矩,並消除反電動勢高次諧波,以減少轉矩漣波之產生。二、徑向電磁力;此電磁力沿著半徑方向直接作用於馬達定子與轉子,易於馬達運作時,造成馬達形變而引起振動。由於徑向電磁力深受馬達結構影響,本研究則以定子細部尺寸做變化,以電磁力軌跡圖觀察馬達運轉時,定子之受力狀況,並找出可降低馬達徑向電磁力,仍能維持額定轉矩輸出之最佳尺寸。三、馬達偏心;此為馬達製造上常見的問題,造成馬達機械與電氣之不平衡,進而使馬達振動。本論文則針對馬達偏心程度的不同,分析轉矩漣波及徑向力之變化,並採用不同繞組連結方式以降低轉矩漣波,同時分析馬達各項電氣參數,以了解馬達偏心對性能所造成的影響。四、馬達對稱與不對稱結構;由於馬達切線與徑向電磁力皆影響馬達振動量,因此分別針對對稱與不對稱之馬達結構,進行轉矩漣波與徑向電磁力分析,並模擬與實測馬達之振動大小,以釐清真正主要影響馬達振動的電磁力。

英文摘要

Creating a comfortable environment has become a sought-after goal for both home appliances and motor manufacturers due to the increasing consumer demand for an improved quality of life in recent years. Thus, the issues on how to minimize the vibration and noise of motors have gradually received substantial attention. This dissertation explores the effects of electromagnetic forces on the vibration found in permanent magnet brushless motors. Four research topics are investigated in this dissertation and they are: 1. Tangential force: the fluctuation of tangential force causes unstable output torque, and thus torque ripple and motor vibration are created. This study analyzes the main factor that results in torque ripple of permanent magnet brushless motors, i.e., back-EMF waveforms, and proposes a two-segment rotor structure to reduce cogging torque, higher-order harmonics, and torque ripple. 2. Radial force: this electromagnetic force acts on the stator and rotor in the radial direction and causes motor vibration as the rotor rotates. In this study, the effect of motor structure on the fluctuation of radial force is obtained by recording force loci figures. Moreover, the structure parameters which can reduce the radial force with the same output torque are examined. 3. Rotor eccentricity: rotor eccentricity is a common problem which induces motor vibration and noise. This dissertation presents the variation of torque ripple and radial force with various levels of rotor eccentricity. Furthermore, the electrical parameters are also analyzed to show the influence of rotor eccentricity. 4. Symmetric and asymmetric motor structures: in this study, the examination of torque ripple and radial force are presented with the symmetric and asymmetric motors. In order to recognize the main factor which seriously causes the motor vibration, the simulation and measurement of motor vibration are reported. Overall, this dissertation provides a good reference for motor designers to reduce motor vibration in the design procedures.


指導教授 - 蔡明祺

口試委員 - 蔡南全

口試委員 - 何世江

口試委員 - 劉承宗

口試委員 - 黃昌圳

召集委員 - 邱政勳


 

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