| In engineering practice, because the geometry of electrical machine is very complicate, numerical method has more advantages than analysis method such as accuracy. However, this is depend on the accurate simulation on nonlinear transient electromagnetic field, which relate with many aspects, include transient theory of machine, numerical calculation method, solving nonlinear equations, FEM mesh generation and so on. Therefore, to develop a general purpose analysis method and procedure is very important for science research and engineering application.Today, OOP and COM technique is used widely in software area. In this paper, on the basis of nonlinear transient electromagnetic field analysis, OOP technique is applied to build the basic class library of machine, and the store of large sparse matrix was combined with related algorithm closely, which save the CPU time obviously. The special software package was compiled and encapsulated as COM component, OCX or DLL, which can be called by many programming languages. As a result, the transplantation, versatility and reusable ability are ensured fully.During the research, some discussions such as how to solve transient problem using time-stepping method and how to solve nonlinear problem using N-R method are presented. Finally, the nonlinear transient electromagnetic field of a 600MW turbo-generator is solved and the simulation results verify the methods.
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