近幾年隨著電腦技術的快速發展，可儲存大量資料的光學及磁性元件裝置需求增加快速，這類元件裝置均需要高精密主軸馬達驅動碟片，以達到快速且精確的資料存取。本文以多相馬達的創新設計，提出一新型二相直流無刷馬達，以克服現有之單相三明治(Sandwich)結構馬達先天上的起動轉矩問題及頓轉扭矩，且擁有製造組裝容易及製造成本較低的優勢，可應用於CD-ROM及DVD-ROM等儲存設備。
再者，該新型二相馬達為一特殊的軸向繞線-徑向氣隙結構，在軸方向有磁場迴路，因此分析上須利用三維建模求解，進行所需的馬達特性分析，但三維分析在模擬計算上是十分耗時。為解決此問題，本文提出一種可有效解決三維磁場分析的數值分析法，此方法結合等效磁路法與邊界元素法，將馬達磁氣迴路以等效磁路描述之，並利用邊界元素法，直接求得氣隙磁導分布，進而推導出馬達的電壓方程式，且以能量法求得馬達的頓轉扭矩(Detent Torque)。此分析法可大幅降低電腦運算時間，適合於天生具三維磁通分布之馬達最佳化設計。
本文最後並完成新型二相馬達原型機進行性能評估，及發展一可適用新型二相馬達之驅動IC電路，整合應用於CD/DVD-ROM多媒體撥放設備上，其操作測試顯示二相馬達符合系統的性能要求，可成功地讀取聲音及影像訊號。實驗結果也顯示商業汎用型的三相驅動IC可適用於所提的二相馬達，直接應用於市售之CD-ROM及DVD-ROM裝備上，此說明二相馬達在未來之應用潛能。

With the rapid progress in computer technology, the need for mass data storage such as optical and magneto-optical devices has increased considerably over recent years. The disk drive for these devices requires high precision spindle motors for fast and accurate data access. This thesis presents a novel two-phase motor design for digital video disk（DVD）and compact disk （CD）spindle applications. The construction of this new DC brushless motor is basically of a sandwich type, which has the distinct advantage of low manufacturing costs due to its simple stator structure and windings. Also in contrast with existing single-phase spindle motors, the proposed two-phase configuration eliminates the dead starting point and significantly reduces torque ripple.

This sandwich type motor with axial-windings and the radial-air-gap has inherent 3D flux distribution, which requires considerable computational time for computer-aided design and analysis. This study proposes an analytical method based on an equivalent magnetic circuit, where the permeance distribution per salient pole is calculated using the boundary element method. This is particularly suitable for solving partial differential equations and since the basic voltage equation can be deduced, the detent torque can be calculated analytically using the energy method. The proposed approach is computationally efficient and suitable for the optimal design of motors with inherent 3D flux distribution.

A prototype of this new two-phase motor design is made for performance evaluation and a drive circuit is developed for testing both DVD and CD-ROM drives. Operational tests showed the optical disk drive satisfied performance requirements by successfully accessing audio and visual signals. Experimental results also indicated that commercially available three-phase motor drive ICs can be effectively adapted to work with the two-phase motor design, giving it some promising applications.

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