永磁同步电机离散化建模与分析

为解决内置式永磁同步电机(IPMSM)离散化模型存在的复杂度和精度相互矛盾的问题,以磁链为状态量的对称化建模思路使得复矢量技术得以利用,模型描述得以简化.但所获得的复矢量模型在离散化过程中,依然受到电流状态的影响,其变化通过电阻压降耦合到状态方程中.为此,分析和讨论了采样间隔内电流变化的不同描述方式对离散化建模精度的影...

Discrete-time Modeling and Analysis of Permanent Magnet Synchronous Motor

For interior permanent magnet synchronous motor(IPMSM),accuracy of its discrete-time model is usually at the cost of complexity.To find out a way out of the dilemma,stator flux is chosen as the state variable,allowing its model be represented in the complex form and resulting in a concise model in appearance.However,discretization of the model would still be affected by the current state through the voltage drop on the stator resistance.Under this background,several different representations of the stator current during one sample interval were presented and their effects on the discrete-time model accuracy were discussed.By this process,an ideal representation of the stator current was found out to yield a high accurate discrete-time model,by which,the IPMSM was allowed to be modelled in concise form,with mild calculation load,as well as in high accuracy.Finally,a typical control scheme was used to build the current control loop but based on the discussed several different discrete-time models,to further verify th e accuracy of these models.