The project originating from technological innovation plan in Xi'an is to research a hybrid excitation synchronous generator. The basic operating principles and the performance characteristics of the hyrid excitation synchronous generator are researched in this paper. According to design characteristics of the hybrid excitation synchronous generator, combining with electric machine CAD technique, the novel hybrid excitation synchronous generator CAD system based on Windows operation system is developed by using C++Builder6.0 language. The system adopts ListView and TreeView window interface, sustains multi-task function, its operation is easier by using mouse and keyboard. According to characteristics of the electric machine, ActiveX Control has been compiled, it sustains message deliver,floating- point format control function and so on. The functions of electric machine design, structure chart output are realized based on engineering database .Experience demonstrates the system's interface is friend and its operation is simple and convenient.
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