【摘要】 产品竞争的加剧和科研水平的提高,用户从不同角度对稀土永磁同步发电机的各项指标提出了更高的要求,这使得设计者对传统的设计方法愈来愈感到不满足。本文结合稀土永磁电机的设计特点,采用场路结合的方法,提出了一个稀土永磁同步发电机两目标优化设计的数学模型;指出用弱内罚函数法与容许域约束相结合的方法,对电机的优化设计是极为适用的;文中并提出了权因子的选择准则。设计过程中,电参数采用路的方法进行计算,磁参数采用非线性有限元法进行计算[4,5,8],这就避开了对漏磁系数等难以精确计算的问题。作者成功地对一台功率为1.7KVA的稀土永磁同步发电机进行了两目标优化设计,得到的结果与原方案相比较有明显的改善。更多还原

【Abstract】 The development of applied mathematics and it’s practical applicationhave raised rapidly the level of technology.This and the intensified industrialcompetition demand even higher requirements or ratings for the Rare EarthPermanent Magnet synchronous generators.Computation of magnetic parametersin the design of electrical machines in most textbooks was in the past basedon the equivalent magnetic circuit.Most papers on optimization for electricalmachines,such as reference[9]have started from the equivalent magneticcircuit and have only considered single objective.In recent years,the intro-duction of finite element method into electromagnetic design[5][8]makes itpossible to go beyond the equivalent magnetic circuit and to compute themagnetic parameters more accurately.And in a recent mathematical paper[7]multi-objective optimization has been taken into consideration. In this paper,the authors put forward the mathematical model of multi-objective optimization design,and apply this to a two-objective optimizationfor REPM generator.In the process of searching for optimum,two parallelsets are assumed.Optimization consists essentially of the minimization(throughiteration)of the two-objective functions while satisfying certain feasibilityconstraints.Thus is obtained the unique optimal solution,which correspondsto the minima of the two-objective functions.This paper uses the techniqueof Inner Penalty Function-Feasible Region Restriction method to take intoconsideration the constraints.Careful selection of weight factors,which dependsmuch on the experience of the designer,accelerates the searching for optimaldesign.Initial point itself is the result of the process of iteration.This papergives an optimal procedure for finding a proper starting point,whichsimplifies the process of multi-objective optimization.To a void the difficultiesin accurately calculating leakage coefficients and voltage regulation,finiteelement method is used for the numerical analysis of magnetic field(nonlinearproblem is considered).Electric parameters,as is customary,are calculatedby equivalent circuits.更多还原