永磁同步电机新型转子磁链滑模观测器

New Rotor Flux Sliding Mode Observer for Permanent Magnet Synchronous Motor

针对传统永磁同步电机反电势滑模观测器转子位置估计存在的信号抖振和相位滞后问题,提出一种以电机定子电流与转子磁链为状态变量的四阶新型转子磁链滑模观测器。首先,以电机定子电流与转子磁链为状态变量构建四阶状态方程,选取定子电流观测误差为滑模面构建转子磁链滑模观测器。其次,设计一种新型锁相环对转子位置和转速进行进一步估算,避免引入反正切函数和微分运算带来的位置估算不精确问题。实验结果验证了新型滑模观测器在位置估算精度和抖振抑制方面的优势。

In order to solve the problem of signal chattering and phase lag existing in traditional back EMF SMO of PMSM,a new fourth-order SMO of rotor flux with stator current and rotor flux as state variables was proposed.Firstly,the fourth-order state equation was constructed with stator current and rotor flux as state variables,and the stator current observation error was selected as the sliding surface to construct the rotor flux SMO.Secondly,a new PLL was designed to further estimate the rotor position and speed,avoiding the inaccurate position estimation caused by the introduction of anti tangent function and differential operation.Experiment results verify the advantages of new SMO in position estimation accuracy and chattering suppression.