Research Of Algorithm To Determine The Steady-state Equivalent Circuit Parameters Of Three-phase Asynchronous Motors

Three-phase asynchronous motors are applied in industrial and agricultural production as well as automation process extensively because they have the merits of small size, light weight, low cost, high efficiency, reliable function and convenient maintenance. It is important for either design, manufacture and evaluation or application and maintenance of motors to determine the steady-state equivalent circuit parameters of Three-phase asynchronous motors precisely and conveniently.Three- Phase asynchronous motor's parameters in stable-state can reflect many kinds of characteristics of motor. It possesses important meanings to the application and maintenance of the electrical machinery to obtain three-phased asynchronous motor's parameters accurately and conveniently and effectively, no matter to the design, manufacture and appraising of the electrical machinery.Chapter one of this paper introduces the development course studied briefly focus on the parameter identification of the electrical machinery, listing the evolution of the foreign researcher's research results especially, then has stated meaning and importance for three-phrase asynchronous motor parameters identification,and finally it does a whole arrangement to this thesis.Chapter two combines the stable-state equivalent circuit model and characteristic function expression formulae of three-phrase asynchronous motor, have stated three kinds of commonly used test methods briefly: The traditional unloaded approach and stopping up method as well revising the parameters law directly and pushes least square method successively. The algorithm for parameters identification for three-phase asynchronous motors in stable-state status has been introduced based on hereditary.Chapter three introduces the principle and characteristic of biological foundation of the hereditary algorithms; Have confirmed that utilizes the hereditary algorithms and improved hereditary algorithms to discern realizing the step concretely of three different phrase electrical machinery stable-state parameters separately, have summarized the advantage in three different phrase motor stable-state model parameters are discerned of this kind of discernment method .Chapter four utilizes C ++ builder 6.0 tool to write relevant C++ parameters and discern the procedure of realizing, procedure emulation written to utilize discern one three-phase asynchronous motor, discern the result,and reached the anticipated result.Finally, apply this approach and equivalent to the parameters determination of a three-phase asynchronous motor. We use the method of classical parameter determination and the method presented in this paper respectively to obtain the steady-state equivalent circuit parameters; then, basing on the relevant data from testing, by comparing the results from classical parameter test method, we conclude that my method improves the precision of parameter determination remarkably, and therefore my method proves to be feasible and valid. Then this paper point out insufficient and looking into the distance.