| Distributed power generation takes pressure off electric transmission infrastructure and has many benefits, such as low emissions, fuel flexibility and high efficiency. The high speed permanent magnet (PM) machine has very important application in the distributed power system for its high speed, small size, high efficiency and power density and it could be used in many other applications such as compressor, energy storage flywheel, and so on.Rotor design is the key of high speed machine. Due to the simple structure and high energy density of PM rotor, it is the first choice of high speed machine. Its weakness can't be avoided. The PM is not able to withstand large centrifugal force and must be encapsulated in some high-strength material. And the PM material may be easily demagnetized in high temperature. So with the PM rotor, the reluctance rotor has the characteristics of easier manufacture, simpler craft and lower cost. It could work in high speed. So the research of reluctance machine is also meaningful.Firstly, three machines: doubly salient permanent magnet motor (DSPM), PM doubly fed reluctance generator, and doubly fed reluctance generator are analyzed. The principle and control modes of these three machines are analyzed and the mathematic modes are studied in the paper. DSPM are applied in motor. PM doubly fed reluctance generator and doubly fed reluctance generator are mainly used in high speed generator.Then the 2D finite element models of the PM rotor and reluctance rotor had been built up, the mechanical strength analysis is engaged and the stress distribution in the them are obtained. The analysis provides a foundation for the rotor's safety operating.At last, the loss and the electro-magneto characters of the PM machine and the reluctance machine are obtained by the combination of the field and circuit method. The reluctance machine could be only used in small power application for its power density is much smaller than that of the PM machine.
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