The Reactance Calculation And Vector Control Simulation Of Permanent Magnet Synchronous Motor In Electric Automobile

As energy use tightly, as well as ecological environment are prominent day by day, automobile industry is facing with a new challenge. The Electric automobile is a vehicle which takes the battery as a power, used electrical motor drive wheel, and also satisfies the road safety laws. Its development is the inevitable product of the energy crisis and the request for the environment. The car manufacturers in the world have invested a lot of money in the development of electric automobile. The driving motor and its control system are the key parts in the power system of electric automobile. The permanent magnet synchronous motor (PMSM) has been applied more and more popularly in the electrical automobile because of its small size and good reliability.A mathematical model of permanent magnet synchronous motor in electric automobile is established in two-dimensional nonlinear constant magnetic field in this paper. Finite element analysis is used as a means of mathematical calculations. The reactance parameters are calculated basing on modifying the relative permeabilityμr. At the meantime the trends of the reactance parameters changing with the stator phase current are given in this paper. The curves of the stator winding self-inductance and the mutual inductance changing with the rotor position are also gained.In order to improve the variable-frequency driving without no-damping winding synchronous motor's analysis and designing precision, a coupling system model between 2D finite element motor model and SPWM vector control circuit is established in this paper. The closed-loop current control and the closed-loop speed control are achieved. The id = 0control algorithm is used in this control system. The excitation source of motor winding is the variable-frequency SPWM voltage signal. The system model takes into account the fidelity of the driving circuit and it has the accuracy of finite element model. The dynamic performance of the motor in the special driving can be better simulated. The nonlinear problems are not accurately considered in the dynamic model built only by the electrical impedance parameters. The system model in this paper can avoid this problem.