| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 91 === The purpose of this thesis focuses on both efficiency improvement and characteristic analyses of conventional induction machines. The primary drawback of a conventional induction machine is its lower efficiency as compared to a synchronous machine of the same ratings and size. This thesis employs both equivalent-circuit method and finite-element method to analyze transient and steady-state performance of an induction machine in order to promote efficiency by modifying its size, the employed core material, and difference design scheme, etc.
The performance of two three-phase, 220 V(Δ)/380 V(Y), 4 poles, 1 HP induction machines of conventional and high-efficiency are employed to investigate and compared. Three operating modes of an induction machine, i.e., induction motor, isolated self-excited induction generator and grid-connected induction generator, are respectively utilized. Both steady-state and transient characteristics as well as both experimental and simulated results of the two studied induction machines are performed and compared in order to validate the important features of the high-efficiency induction machines.
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