Research On The Characteristics Of Wound-Field Doubly Salient Generator And Motor

The Wound-field Doubly Salient Machine (WFDSM) has the prominent advantages of simplestructure, high reliability, high power density and controllable excitation.A lot of research works onthe topologies of this kind of machines have been done by the scholars at home and abroad.In this paper, the basic principle and performance of Doubly Salient Wound-field Generator andMotor are investigated by the theory analysis, finite element method and experiment test.Firstly, the configuration and the basic principle of three-phase WFDSM are analyzed.According to the theroy of electric circuit and magnetic circuit, the physical model is established.Standard Angle Control Mode is adopted and the nonlinear differential equations are given. With the37kW WFDSM, the speed control system is designed based on DSP and a complex programmablelogic device (CPLD), which can generate the pulses by adjusting duty cycle according to the speed.The hardware and software of the digital control system are introduced. Meanwhile, a12/8polesprototype is built for verification.The experiment results under generator and motor state confirm thatthe theorial analysis is correct.A four-phase24/18poles WFDSM is modelled by ANSOFT. Finite element analysis is carriedout to investigate its steady characteristics, such as field distribution, air gap magnetic density, fieldflux, inductance, armature current, armature voltage and elctromagnetic torque. Furthermore, theinfluences of different structure parameters on steady characteristics are investigated. It is found thatthe widened rotor pole and stator pole are helpful to improve the power characteristic. Theoptimization results provide the design references for the four-phase WFDSM.