直接转矩控制的永磁同步电机转速估计

Direct Torque Control of Permanent Magnet Synchronous Motor Speed Estimation

针对超高速永磁同步电机在转速估计中还存在精度较低、误差较大等问题,提出了一种基于直接转矩控制的永磁同步电机转速估计算法。首先构建两相静止坐标系,并在此基础上建立无凸极效应模型,然后将EKF应用于超高速永磁同步电机控制系统中,然后对电压空间矢量进行优化,并采用基于定子电压的磁链观测模型进行磁链估计与滞环控制,最后进行磁链估计与滞环控制。算法仿真实验结果表明,本文提出的转速估计算法具有较好的估计结果。

In view of the difficulty of installation of high speed permanent magnet synchronous motor position sensor and high requirements,this paper presents a speed estimation algorithm of permanent magnet synchronous motor based on direct torque control. Firstly,the mathematical model of non-salient pole effect in two-phase stationary coordinate system is selected. The EKF is applied to the control system of the super high speed permanent magnet synchronous motor. Then the voltage space vector is optimized and the stator voltage based flux observation model is used Flux estimation and hysteresis control,and finally flux estimation and hysteresis control. The simulation results show that the speed estimation algorithm proposed in this paper has better estimation results.