Optimization Design Of Brushless Direct Current Motor For Robot Based On Improved Differential Evolution Algorithm

Brushless direct current motor is small in size,light in mass,low in noise and high in reliability,so it is often used in the research of robot.In this paper,a brushless direct current motor is designed for the joint motor of humanoid robot,which is optimized by the improved differential evolution algorithm,and a prototype is manufactured to verify the performance.First of all,according to the characteristics,design formula and relevant experience of the brushless direct current motor used in humanoid robot joints,referring to the relevant parameters of other fields,the initial design scheme is determined,and the no-load and load characteristics of the designed motor are analyzed by the finite element method.Secondly,the view of the problem of population diversity in the standard differential evolution algorithm improved differential evolution algorithm is proposed,through opposition-based learning,new mutation strategy and adaptive parameter in the face of the differential evolution algorithm is improved,and using the standard test functions respectively to the differential evolution algorithm and the improved differential evolution algorithm was tested,and verify the effectiveness of the improved differential evolution algorithm.Then,thanks to a robot with a hope to brushless direct current motor with high power density,so the selection of weight and maximum output power as objective function,the teeth of the stator flux density,the yoke of the stator flux density and magnetic rotor yo ke as constraint conditions,the response surface method is used to replace the model fitting of the objective function and optimization variables,constraints and optimization,the relation between the improved differential evolution algorithm for stator outer diameter,length of iron core,pole arc coefficient and permanent magnet thickness optimization design was carried out on the four parameters,can get the optimized electrical design.Through the finite element method of the improved scheme of motor no-load and load characteristic simulation analysis of available motor magnetic line of force distribution,the distribution of magnetic flux density cloud,current curve graph,and torque curve graph,by comparing the initial scheme and the improved scheme of motor characteristic,verify the improved differential evolution algorithm to optimize the effectiveness of the brushless direct current motor.Finally,in order to further verify the rationality of the motor design scheme,a prototype of brushless direct current motor with 410 W power and 1700r/min speed is made according to the electromagnetic design scheme of the motor.An experimental platform is built to carry out experimental research on the prototype.The experimental data of the prototype can be obtained by testing the prototype with relevant equipment,further verify the effectiveness of optimization.