Research And Implement The Permanent Magnet Synchronous Motor Speed Control Method Of Field Weakening

With the global vehicle population continues to increase, a large number ofautomobile internal combustion engine emissions of harmful gases harm to theenvironment to become a more and more obvious environmental problems can not beignored, combined with escalating oil prices and declining reserves, making itActively looking for an internal combustion engine have the power alternatives.Permanent magnetic materials in recent years with the continuous improvement ofperformance and improvement of the rapid development of power electroniccomponents and control algorithms mature, to promote the application of permanentmagnet synchronous motor and research and development has entered a new phase. Inthis context, the automotive industry as the ultimate solution for environmentalproblems of the electric car has the trend of growing use of permanent magnetsynchronous motor as the power core, especially with the more rapid expansion ofcapacity built-in permanent magnet synchronous motor. Therefore, strengtheningresearch and development of high-performance built-in permanent magnetsynchronous motor drive system has important theoretical and practical value.The main contents of this paper is built-in permanent magnet synchronous motorcontrol method of field weakening. Because built-in permanent magnet synchronousmotor base speed to use more current than the maximum torque control, this controlmode to its weakening control mode of the transition to in-depth analysis of theprocess, for the characteristics of the stator current trajectory design of fieldweakening phase Control systems, and simulation verify the theoretical correctnessand verify the actual effectiveness of experimental platform structures.This article first permanent magnet motor for a detailed classification, introducedon this basis, built-in permanent magnet synchronous motor for electric vehicle powersuperiority. This article focused on the characteristics of various vector controlmethods to determine the built-in base-speed permanent magnet synchronous motorused under the current ratio of the maximum torque control method, and based on theuse of speed control of field weakening control features. These two control methodsin the stator current trajectory of in-depth analysis and discussion of the speed controlmode switching points affected by load conditions, based on the design of thephase-shift control system and field weakening simulation.Finally, using high-performance DSP chip TMS320F2812as the control, set up a built-phase permanent magnet synchronous motor field weakening control system.Maximum torque for the base speed ratio and the current weakening control phaseno-load and load test done, and fully verify the effectiveness of the control strategy.