Multi-objective Optimization Design Of Permanent Magnet Synchronous Motor For Electric Logistics Vehicle Based On Taguchi Algorithm

In recent years,electric vehicles have been developing vigorously around the world.Benefiting from the support of national policies,the improvement of people's awareness of enviroN.mental protection and the rapid development of key battery technologies,electric vehicles have taken a place in China's automobile market and become the main trend of future automobile development.At present,with the rapid development of online shopping,logistics and express delivery industries,the demand for pure electric special logistics vehicles keeps increasing.As postal,logistics and express vehicles,long endurance,large space,strong power and reliable quality are the focus of customers' attention.This requires small size,high efficiency,high endurance and high torque density of the driving motor.Aiming at the above problems,according to the actual demand of a new energy automobile company,this paper designs a 30 kW permanent magnet synchronous motor for logistics vehicles,and conducts performance simulation analysis,parameter optimization and experimental research on it.The main contents include the following four aspects:(1)According to the performance requirements of permanent magnet synchronous motor,this paper conducts dynamic performance analysis,and obtains the preliminary parameters of the motor system according to the dynamic performance index parameters.Combined with the electromagnetic design theory and design experience of the permanent magnet motor,the electromagnetic design of the permanent magnet synchronous motor for electric logistics vehicles with rated power of 30 kW was completed.In order to maximize the torque density and maximum efficiency of the motor,the rotor adopts a built-in "V" permanent magnet structure.In order to reduce the eddy current loss and hysteresis loss caused by the magnetic field of the motor and improve the slot full rate,the motor adopts integer slot single-layer distribution winding,rotor 8-pole,stator 48-slot.The stator core is compacted by 0.35 mm thick silicon steel sheets with evenly distributed pear-shaped grooves.(2)Through the finite element software with Maxwell MotorCAD software in the preliminary design of permanent magnet synchronous motor simulation model is established,the model of the designed motor under no-load and load performance analysis of electromagnetic field,including motor magnetic cloud chart analysis,the counter electromotive force and harmonic analysis and torque waveform analysis and so on,analyzed the cogging torque of the motor characteristics,and verify the rationality of the design.(3)In order to improve the efficiency and torque density of the motor,the multi-objective optimization design of permanent magnet synchronous motor based on taguchi algorithm is proposed.The structural parameters which have a great influence on the performance of the motor are selected as optimization variables(optimization factors).The optimum structure parameters are obtained by optimizing the maximum efficiency,minimum cogging torque and maximum torque density of the motor.After optimization,the electric cogging torque is greatly reduced and the efficiency is obviously improved.(4)According to the data in this paper,the optimization results of the prototype test for new built-in permanent magnet synchronous motor,and then to bench testing,through the actual test to get the motor data such as external characteristic curve and efficiency of MAP figure,comparing with the results of simulation verify its,and further on the basis of GB/T 18488.1 2015 ?electric car with a drive motor system,part 1: technical conditions?,GB/T 18488.2 2015 ?electric car with a drive motor system part 2: test method?,test request trial production prototype for this article.The results show that the PMSM designed and optimized in this paper can meet the inspection criteria,and is reasonable and applicable..