| With the advantages of environmental protection,high efficiency and easy maintenance,electric vehicles have developed rapidly in the automotive industry.Motor drive control system is one of the cores of electric vehicles.Under the condition of fixed battery pack capacity,its speed regulation performance is directly related to the power performance and range of electric vehicles.Interior permanent magnet synchronous motor(IPMSM)is favored in the field of electric vehicles due to its advantages of strong load carrying capacity,easy to realize weak magnetic field speed increase and high working efficiency.According to the actual operating conditions faced by the electric vehicle,when the IPMSM operates at low speed,in order to meet the actual needs of the electric vehicle such as climbing,fast starting and acceleration,the motor drive control system needs to have fast speed response and large torque output capability;When the IPMSM operates at a high speed,the drive system must have the ability to output high speed and operate with a certain load in order to achieve high-speed driving,overtaking and other actual working conditions of the electric vehicle.Therefore,according to the actual operation requirements of electric vehicles,this paper will carry out research on the speed regulation control strategy of IPMSM in low speed and high speed segments.First of all,the mathematical models of the electric vehicle drive motor in different coordinate systems are constructed and analyzed,and the space vector control method is studied.When the electric vehicle is operating at low speed,vector control analysis is conducted for IPMSM at low speed.Aiming at the magnetoresistive torque generated by i_d=0 control that can not take advantage of the saliency effect of IPMSM,the maximum torque per ampere(MTPA)vector control is adopted and realized by curve fitting method,which can improve the system’s ability to output large torque and work efficiency while reducing the amount of real-time calculation;In view of the difficulty of traditional PI speed controller to achieve IPMSM high-performance control,the global fast terminal sliding mode(GFTSM)speed controller is designed.Compared with traditional TSM,it can effectively reduce system chattering,and when the electric vehicle encounters load disturbance suddenly,the motor speed can quickly respond to the reference speed.Secondly,the driving control of electric vehicle under high-speed operation condition is analyzed.Aiming at the defect that the current vector trajectory planning is not reasonable under the negative d-axis current compensation field weakening control method,which causes obvious current and torque oscillations during deep field weakening,the field weakening control strategy based on gradient descent algorithm is adopted,which not only weakens the current and torque oscillations,but also broadens the speed regulation range of the motor and improves the load carrying capacity of the system;In order to avoid integral saturation of current loop PI controller in the process of field weakening and affect the speed regulation performance of the system,an anti integral saturation control method is adopted.Finally,the control system simulation models of IPMSM at low speed and high speed are built.The simulation results show that the proposed control strategy can improve the torque output and speed response ability of IPMSM at low speed,and improve the load carrying capacity and work efficiency at high speed.In addition,the hardware and software of the electric vehicle speed control system are designed,and the system operation test is carried out.The experimental results show that the IPM drive signal,voltage and current signal waveforms of the speed control system are normal and complete,which can make the drive motor maintain a stable operating state.Figure[51]Table[3]Reference[72]... |
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