Research And Implementation Of IPMSM Control Algorithm For Series Hybrid Vehicles

With the increasing energy consumption and environmental pollution,new energy fields have gained new momentum,such as energy conservation and environmental protection of electric vehicles are rapidly developing.However,in this field of rapid development of the process there are many problems to be overcome,the most obvious is in the motor drive control system this aspect.At the same time,because China has a lot of permanent magnetic materials and its own performance advantages,so that China’s electric vehicle for the choice of driving motor is mainly permanent magnet synchronous motor as the main application research direction.Therefore,in this paper,the built-in permanent magnet synchronous motor as the object of study,the series of hybrid electric vehicle IPMSM drive control carried out in-depth research.First of all,elaborated the research background of this topic and its significance in detail,this paper introduces the current development status and prospect of electric vehicles in China and abroad,analyzes and compares the characteristics of different driving motors,and finally combines some related factors and the general usage of driving motors of domestic and foreign electric vehicles.The internal permanent magnet synchronous motor is used as the research object of this paper,and some driving control methods in the industry are compared and analyzed in detail,which pave the way for the subsequent control research of electric vehicle driving motor.Secondly,the control scheme of this type of motor in the low speed constant torque region is studied thoroughly,then according to the electromagnetic torque formula of the motor and the mathematic model of the motor,some related formulas of MTPA control are deduced.Then,considering some drawbacks of the existing MTPA control,a modified MTPA control method is proposed to find a relationship between active current and reactive current,which can solve the non-linear problem between torque and current.At the same time,the improved control strategy is developed and then simplified by Taylor,and this new control algorithm is especially applicable in engineering.Finally,the improved MTPA control strategy and control strategy for 0 of straight shaft current are simulated and compared with each other in the same condition.Thirdly,aiming at the high speed operating condition of the internal permanent magnet synchronous motor,the weak magnetic operation strategy in the constant power region is studied deeply.The deep analysis of the high speed and weak magnetic principle of the internal permanent magnet synchronous motor is carried out,and a MTPA weak magnetic control scheme based on voltage feedback is proposed,the motor parameters are not dependent,the operation is stable,and the efficiency of the motor and the controller can be improved.Finally,the analysis and verification of this strategy is carried out through MATLAB simulation.Finally,the electric hardware circuit design and the software algorithm control flow chart of drive system for electric vehicle are explained in detail,the actual experimental platform is built,the core chip is selected tms320f28335,and the motor and its controller are tested under corresponding conditions.The results of the experiment strongly confirm the reliability of the control method mentioned in this paper.