- Three-phase synchronous motors find their major application in industrial situations where there is a large, reasonably steady mechanical load, usually in excess of 300 kilowatts, and where the ability to operate at leading power factor is of value. - Below this power level, synchronous machines are generally more expensive than induction machines. - Large synchronous motors with power ratings of several megawatts are used in some industrial processes to take advantage of their high efficiency and the ability to control the supply power factor. - However, today controlling speed of the large synchoronous motors is caring about. - Name of topic: Frequency control for the large synchronous motors The document include: Chapter 1: Overview of synchronous machines and sketchy knowledge of inverters Chaper 2: Dynamic system of Three-phase synchronous motors - Current source inverters which natural communicated
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