开关角对斜槽转子SRM稳态转矩的多目标优化

Multi-objective Optimization of Steady-state Torque of Switched Reluctance Motor with a Skewed Slots Rotor Based on Switching Angle

开关磁阻电机转子斜槽结构可有效减小电磁径向力,但会导致转矩特性变化。针对该问题,给出了线性模型下斜槽转子开关磁阻电机稳态转矩的解析方法,然后建立了四相8/6极开关磁阻电机模型,采用三维有限元仿真方法,计及端部漏磁,以电流开通角、关断角和转子斜槽角度为优化参数,以平均转矩变化量最小和转矩脉动最小为优化目标,基于正交试验法设计试验方案,通过极差和方差分析确定了相应参数的优组合,并将优化前后的转矩特性进行了比较,结果表明:小的斜槽角度对转矩特性的影响并不大,优化后电机的平均转矩相比优化前只变化了16.01%,但其转矩脉动下降了23.63%。

The structure of switched reluctance motor with a skewed slots rotor can effectively reduce the electromagnetic radial force,but it will also lead to changes in torque characteristics. Aiming at this problem,the calculation method under linear model of steady-state torque of switched reluctance motor with skewed slots structure rotor was given.Then a four-phase 8/6 poles switched reluctance motor model was established.The three-dimensional finite element simulation method was used to account for the end leakage flux. The current turn-on angle,turn-off angle and skewed slots angle of rotor were used as optimization parameters. The minimum average torque variation and the minimum torque ripple were the optimization objectives. The test plan was designed based on the orthogonal test method. The excellent combination of the corresponding parameters were determined by range and variance analysis,and the motor torque characteristics before and after optimization were compared. The results shows that a small chute angle has little effect on the torque characteristics,after optimization,the average torque of the motor is only changed by 16.01%,but its torque ripple is decreased by 23.63%.