| The biaxial excitation generator/motor for automobiles (BEGA)is a new kindof machine,witch can perform not only in the wide speed range through weekend flux,but also in the high power density. Because of this good performance, this kind ofmachine have an extensive research and application in the fields which specifies fastspeed governing characteristics and high control response, for example, electricautomobile, space shuttles and so on.In this paper, the theory of structure and the mathematical models is analyzed forthis machine. The d-axis and q-axis flux circuit is described detail. Through thecomparative analysis of BEGA, electrically excited synchronous motor and thepermanent-magnet synchronous motor, the relation between the operatingperformance and d,q-axis parameters is detail elaborated in different operation andcontrol method.After the theory of BEGA is described, based on the tooth flux method, theprocess and method of the ANSYS finite element calculation of electromagnetic fieldare described. In the case of designed machine, the d,q-axis parameters and operationperformance is analyzed.So far, the accurate d,q-axis parameters have been acquired, the vector controlsystem of BEGA is designed in this paper. Also, the Simulink model is build, thecontrol response performance is simulated.Finally, from the characteristics of operation performance and vector control ofthe motor, the optimal motor design is proposed from the aspects of air gap width,magnetic isolation tank size and permanent magnetic size. |
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