考虑定位力矩补偿的磁通切换永磁电机模型预测转矩控制方法

摘要

为了减小定位力矩对磁通切换永磁(FSPM)电机性能的影响,提出了一种考虑定位力矩补偿功能的模型预测转矩控制(MPTC)方法.通过有限元分析获得FSPM电机定位力矩主要谐波的数学表达式,根据补偿控制理论,构建能够抵消定位力矩的补偿转矩模型.基于MPTC原理,利用补偿转矩模型、预测转矩模型和预测磁链模型共同设计价值函数,以获得最优开关状态.所提控制方法不但能实现定位力矩补偿和转矩脉动抑制,还具有较好的动态性能,并且适用于一般的永磁同步电机.仿真和实验结果验证了所提控制方法的有效性.%To alleviate the influence of the cogging torque,this paper develops a model predictive torque control (MPTC) scheme with cogging torque compensation for flux-switching permanent magnet (FSPM)machines.Firstly,the mathematical expression of the main harmonic components of cogging torque is obtained by finite element analysis.Then,according to the compensating control theory,a cogging-torque-compensating model is constructed to counteract the cogging torque.Further,based on the MPTC method,the cogging-torquecompensating model,the predictive torque model and the predictive flux model are employed to design the cost function.Both simulations and experiments verify that the developed control scheme not only compensates the cogging torque and suppresses the torque ripple,but also offers good dynamic performances.It should be emphasized that it is also applicable to conventional permanent magnet synchronous machines.