Electric Car Motor Drive Control Of Key Technology Research

Pure electric vehicles to the environment protection,relieve the energy crisis has important strategic significance,is the future development direction of automobile industry,as the core unit of pure electric vehicles,electric car motor drive system has become a current research hot spot.Relying on new energy automobile co.,LTD.,jiangling group commissioned research projects,according to the performance requirements of the electric car motor drive controller,combined with the engineering practice,analyses its key technology and research,and on this basis to develop the drive controller prototype.First of all,in this thesis according to the characteristics of the permanent magnet synchronous motor and the performance requirements of the electric car motor drive controller,is put forward based on the STM32 general structure scheme of the electric car motor drive controller.And combined with the characteristics of each module circuit and engineering experiences will be divided into the main control unit,drive unit and power inverter unit,and to clear the function and basic structure of each unit circuit.Secondly,in view of the electric car motor drive high efficiency and high precision requirements,studied the core unit of motor drive controller and design,eliminates the Desat short-circuit protection circuit 50% of blanking time error detection;Through the push-pull circuit realized how grid drive,innovative;On the premise of ensuring accuracy of motor rotor position detection circuit simplifies the circuit design;Improved the front end of busbar voltage sampling circuit of the precision.And fully considering the high and low voltage cross and dv/dt and di/dt change rate caused by the electromagnetic compatibility problem under the premise of the electric car motor drive controller hardware design and debugging.Finally,set up the electric car motor drive controller test platform,the performance of the motor drive controller was tested,and the experimental results validate the correctness of the electric car motor drive controller products,and can realize the permanent magnet synchronous motor vector control strategy,to meet the performance requirements of the electric car motor drive system.