Optimization And Design Of Permanent Magnet Synchronous Motor In The Control Of Automotive Electronic Water Pump

With the continuous improvement of science and technology,the structure of the vehicle engine is becoming larger and more complex.The space layout of the internal parts is becoming more and more compact,and the structure and performance of the automobile cooling system components are also put forward higher requirements.Recently,because of its small size,high efficiency and other advantages PMSM is widely used in the drive of automotive electronic pumps.However,the traditional PMSM vector control needs obtain the information of rotor position and speed by the encoder and other equipment.The presence of additional equipment will increase the motor volume and reduce the space adaptability.In addition,it also can increase the motor failure rate and production costs.Aim at the problem,the Luenberger observer sensorless algorithm is proposed to replace the hardware equipment to obtain rotor position and speed information in this thesis.In this thesis,the sensorless permanent magnet synchronous motor is mainly studied,and the Luenberger observer-based sensorless vector control system is designed and realized theoretically and practically.First of all,in theory,the mathematical model of Permanent Magnet Synchronous Motor(PMSM)is built and analyzed,and the motor is decoupled by coordinate transformation.Combined with the theoretical method of voltage vector pulse width modulation(SVPWM),the simulation model of vector control system is established based on Simulink platform to verify the feasibility of vector control theory with known position and speed information.Then,the basic principle of Luenberger observer and the estimation method of rotor position and speed are elaborated.The sensorless vector control simulation model of Luenberger observer is set up to verify the correctness and feasibility of the algorithm.Finally,the voltage,current and other signals in the motor can be detected by the sampling circuit of based on the STM32 hardware platform.By the Luenberger observer the position and speed of the rotor can be estimated,and then,through the PI regulation and SVPWM algorithm,the control signal can be produced,and it can realize the control to the electrical machinery.The results show that the simulation results of the hardware platform experiment and the simulation model based on Simulink platform are consistent,which proves that the theoretical basis and implementation method adopted in this subject is feasible and correct.And it can meet the development needs of decreasing size of the motor,reducing the cost of the hardware and meeting the automotive electrification.