Research On Improved Simulated Annealing Algorithm For Optimal Design Of Variable Frequency Induction Motor

With the development of automation technology,the application of asynchronous motors in the field of frequency conversion is becoming more and more extensive.The traditional asynchronous motor has a small speed regulation range under the condition of power frequency power supply.In contrast,the variable frequency asynchronous motor has a large speed regulation range and is flexible.Under some special working conditions,such as places where the frequency conversion device is used to drag air-conditioning loads,places such as metallurgical building materials caustic soda,large industrial kilns,crane dump trucks and other places where the load requires large torque and stable operation,or other non-Most of the motors working under power frequency conditions are controlled by the frequency conversion speed regulation system.The optimization of variable frequency asynchronous motor is usually divided into the optimization of asynchronous motor body and the performance optimization of frequency converter.This article uses the method of optimizing the structure of asynchronous motor body.The structure optimization of the motor body can be implemented in combination with modern intelligent algorithms,which can weaken the influence of harmonic magnetic fields in the inverter by changing the structural parameters of the asynchronous motor,thereby reducing the overall loss of the motor and improving the motor efficiency.This article first introduces the design methods and characteristics of variable frequency asynchronous motors,compares their ordinary asynchronous motors,and explains the issues that should be paid attention to when performing optimal design of variable frequency asynchronous motors,such as the high-order time harmonics generated by the inverter Impact on motor loss and efficiency.Then,the formula relationship between the efficiency of the inverter asynchronous motor and theoptimized structural parameters is listed,and the origin of the spatial and time harmonics in the inverter motor and the influence of the harmonic on the inverter motor are analyzed.In order to reduce the influence of time harmonics on the efficiency of the motor,the optimization direction of the stator and rotor slots of the inverter asynchronous motor was designed,and the mathematical model of the optimization design of the inverter asynchronous motor was established.Then the basic principle and application process of the simulated annealing algorithm are introduced,and the simulated annealing algorithm is improved so that it can converge faster to obtain new motor structure parameters,making it more in line with the actual engineering optimization.We have written a C language optimization program for the simulated annealing algorithm flow and the optimized design formula of the inverter motor,and analyzed the electromagnetic data of the prototype.Finally,the structural parameters of the variable frequency asynchronous motor and the operating parameters of the simulated annealing algorithm are substituted into the optimization design program to obtain new motor structural parameters.Using Simpliler and Ansoft Maxwell finite element software,the new motor program was compared with the initial motor program before optimization by finite element simulation analysis.The results confirmed that the improved simulated annealing algorithm is effective and reliable in the optimization design of variable frequency asynchronous motors.