【作者】 张涵； 谢宝昌；

【机构】 上海交通大学电气工程系；

【摘要】 对永磁同步电动机的V-型转子磁钢结构进行了优化设计,目的是为了在电势常数受约束的条件下,获得单位电流峰值转矩最大。由于直轴和交轴电感随磁路饱和程度而变化,为了减少有限元计算工作量,本文采用解析法近似计算最大转矩和对应的弱磁角度。先利用有限元获得特定转子位置电枢绕组的直轴与交轴电感,以及空载磁链,然后利用dq系统数学模型的电磁转矩公式,求得给定电流时的最大转矩和弱磁相位角,随后在该弱磁相位角附近再用有限元方法精确计算电机的最大转矩。解析法所求得的电感和磁链也能为判断优化方案的好坏提供依据。最终的优化方案使峰值转矩时所通过的电流减少了15 A,起到了一定的优化效果。更多还原

【Abstract】 In this paper,the V type rotor magnet structure of a permanent magnet synchronous motor is optimized in order to enlarge the ratio of peak torque to current when the electric potential is restricted near a constant.The direct axis inductance and quadrature axis inductance changes when the magnetic road is more or less saturated,to reduce amount of computation of finite element method,an analytical method is used to find the rough maximum torque and flux-weakening angle of maximum torque by first obtaining the direct axis inductance,quadrature axis inductance and flux linkage,and then using the torque formula in the d,q axis mathematical model.Then finite element method is used to calculate the accurate maximum torque by comparing the torque near the flux-weakening angle which is obtained by the analytical method.At meanwhile,the inductance and flux linkage obtained by this method can provide basis for judging the effectiveness of optimized design.The final optimized design can reduce the peak current by 15 amperes,so it played a certain optimization effect.更多还原