Research Of Vector Control Strategy And Parameter Identification Method For Interior Permanent Magnet Synchronous Motor

With the rapid development of application areas of interior permanent magnetsynchronous motor, the stability of motor operation have become increasinglydemanding, and control technology’s development is moving in the direction of thesecurity, stability and robustness. In order to meet the demand of the the IPMSM’svarious applications, efficient control methods, high flux-weakening level andparameter identification technology become hot topics. The following aspects arestudied mainly in this paper:Firstly established a mathematical model based on the interior permanent magnetsynchronous motor, and determine the electric vehicle control strategy of permanentmagnet synchronous motor control system according to motor parameters and runningconditions. MTPA strategy is used when the motor is running below the base speed, andbuild the double closed loop control system including current loop and velocity loop.The simulations and experiments prove effective and feasible.Secondly, to analyze the flux-weakening control strategy when the motor isrunning above the base speed. There are two strategies above base speed: the methodbase on MTPA and the general flux-weakening strategy, and they are chose according tothe speed and torque demand. The flux-weakening strategy has the characteristic oflarge output torque, high flux-weakening level and not sensitive to parameter variation.Then the strategy is verified by simulations and experiments and analyze the situation ofrunning under different speed, load and bus voltage, and observe the steady switchingbetween different algorithms.Thirdly analyzed the extent and characteristics of influence caused by parametervariations due to the magnetic saturation or temperature rise, and establish thethird-order observer based model reference adaptive which can identify the direct axisinductance, quadrature axis inductance and rotor flux, and feedback the results tomathematical model and PI regulator. The method is proved by simulations andexperiments, and verify the robustness of the method according to the data whenchanging motor’s speed, torque and direction.Finally, the IPMSM drive control system experimental platform based on Infineon32bit MCU-XMC4500has been designed, including hardware circuit and softwareprogramming. Experiments and data analysis on various aspects of the system prove theachievement, and the system is reliable, and it has a very good value in engineeringapplications.