Research On Intelligence Excitation System For Brushless Synchronous Motor

Motor plays an important role in industrial production. With the development of theindustry, the demand of the motor for the production machinery is higher and higher, whichmainly manifests in big power, good stability, strong overload capacity, high power factor, highefficiency, small volume, convenient maintenance etc. While brushless excitation synchronousmotor can meet these requirements, so its application is becoming more and more widely inindustry. Brushless excitation system is the most crucial and the most important part of brushlessexcitation synchronous motor and has the promising development. Therefore, study of brushlessexcitation system of synchronous motor has high theoretical significance and practicalsignificance.At first, this article analyzed the working principle of the synchronous motor, excitationcontrol principle and three kind of excitation mode, and compared the characteristics of variouskinds of excitation mode. Then In combination with predecessors’ achievements,it deduced thesimplified mathematic model of synchronous machine excitation system, and compared themathematical model with the theoretical curve and the physical model simulation results. theerror between the simulation results of the proposed model and the theoretical analysis resultsand physical model simulation results is within5%,which proved that the mathematical modelwe derive is correct and can be used to guide the design of brushless synchronous motorexcitation control system.Finally, based on the mathematical model,it designed brushless excitation control systemwith fuzzy PID feedforward in synchronous motor and made a simulation with MATLABsoftware. Compared with the results of the conventional PID control, the designed excitationsystem had good steady-state accuracy, dynamic stability and resistance to disturbance.