Field-circuit Coupled Space-time Finite Element-based Permanent Magnet Motor Transient Characteristics

Permanent magnet motor has obvious merits such as simple structure,small volume,light mass,little dissipation,high efficiency ratio and various shapes.It's used commonly in industry,agriculture,aerospace,national defense and daily life.For satisfying the high performance of permanent magnet motor,much more accurate calculation and analyze need to be done.It's necessary to establish a method that is suitable for numerical calculation of permanent magnet motor.This paper concentrates on research of transient process of permanent magnet motor.The research is based on theoretical basis and application technology of the space-time finite element method.Method of field-circuit coupled with electric circuit is also used in the research. Following phrases are concerned.In the application research of the space-time finite element method,the engineering practicability problems,which mainly are the medium nonlinear problem,the medium motion problem and the coupling problem between the magnetic field and the circuits, are thoroughly discussed.Aimed to the electromagnetic domain,the space-time finite element method formulation in which the medium nonlinear is given,the measure which deal with the medium motion is pointed,and the space-time finite element method formulation in which the electromagnetic field and the circuits are coupled is given.The paper proposed a method dealing with stator and rotor.Stator and rotor uses different coordinates.Boundary cycle conditions are used to deal with interfaces of stator and rotor.Magnetic field's periodicity is conceded plenty.The content is the application basis of the space-time finite element method.For the transient electromagnetic field,the functional in form of convolution in which the vector variable and boundaries are considered is given,the space-time finite element is analyzed and the space-time finite element method formula is given.Basic transient electromagnetic field model and coupled field-circuit model are all given. This paper first builds magneto electric machine's two-dimension emulation model based on its three-dimension model,then adds two-dimension circuit model outside the emulation model.With coupling field-circuit of the tow models,magneto electric machine's electromagnetic field is analyzed.The test result of the magneto electric machine solid model proves that this emulation is practical.