本文旨在分析及設計九相混合激磁式同步發電機。在轉子側有永久磁鐵以及繞組的直流激磁。九相電機的定子為36槽，轉子為40極，且永久磁鐵與直流激磁的磁路分離，而定子為共同繞阻，如此混合激磁的直流激磁不受永久磁鐵的影響，具有低感應電動勢諧波含量、低轉矩漣波及可調式激磁場電流，適合應用在風力發電之場合。
本文將針對定子的槽、齒及轉子的磁極形狀作設計，以降低感應電動勢的低次諧波含量，採用磁路軟體JMAG作磁路分析，由性能指標作實體設計的依據。本文已完成九相混合激磁式同步發電機實體製作，在額定轉速240rpm及無激磁電流下，感應電動勢基本波峰值與總諧波失真率分別為132.2V及2.79%；當直流激磁電流為4 A時，感應電動勢及總諧波失真率則分別為201V及1.58%。另者，若在九相發電機輸出端接上每相電阻70Ω的平衡負載，則於無激磁電流下，相電壓基本波峰值、總諧波失真率與九相輸出功率分別為83.85V、1.35%及446.82W；而在相同負載下，當直流激磁電流為4A時，相電壓基本波峰值、總諧波失真率及輸出功率則分別為127.1V、0.89%及1kW。分析與實測結果相接近，驗證了本文發電機設計的可行性。

This thesis aims to analyze and design a hybrid excitation synchronous generator, which has the characteristic of both permanent-magnet generator and current excited generator. The hybrid excitation generator has 36 slots and 40 poles with common stator winding. The magnetic circuits of permanent magnet and current excitation winding are separated so that no coupling exists. Having the advantages of low harmonic component, low ripple torque and adjustable excitation current, a generator which is appropriate for wind generation is built.
Analysis and design of machine parameters such as the slots, tooth and shape of magnet in order to reduce low-frequency harmonic components will be conducted. The JMAG Designer software is chosen to analyze the magnetic circuit. A practical hybrid excitation generator is built. At the rated speed of 240rpm and without current excitation, the fundamental peak value of no-load voltage is 132.2V with total harmonic distortion(THD) of 2.79%. Whereas, when the exciting current is 4A, the corresponding fundamental no-load voltage peak and THD are 201V and 1.58%, respectively. By connecting a balanced phase load of 70Ω at each output of the nine-phase generator and without exciting current, the fundamental phase voltage peak, THD and output power are 83.85V, 1.35% and 446.82W, respectively. On the other hand, when the exciting current is 4A, the corresponding fundamental phase voltage peak, THD and output power are 127.1V, 0.89% and 1kW, respectively. Close agreement between analytic and experimental results verifies the feasibility of the proposed design.

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