| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 104 === 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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