基于感应电机定子电流的速度估计算法仿真

Simulation of Speed Estimation Method for Induction Motors Using Stator Current

无速度传感器技术在过去的十年中有了长足进步,该文阐述了一种新颖的用在交流调速系统中的无速度传感器估算方法。使用这种方法不需要关心电机结构、电参数以及负载条件。除此之外,也不需要在系统中进行额外的调节。这种新的估算方法在瞬态谱估计的基础上使用快速傅立叶变换技术从而得到与转子速度相关的齿槽谐波频率。该文在MATLAB/SIMULINK平台的基础上,使用数字信号处理技术提取了由于感应电机气隙产生的齿槽谐波中所包含的与速度相关的信息。并且在不同的PWM逆变器供电频率下估计得到比较满意的感应电机转速。

Speed sensorless motion control system has undergone a rapid development in the past decade. A novel approach in sensorless speed detection for adjustable - speed AC drive is described in this paper. No a priori knowledge is required about the motor construction, electrical parameters, or load condition by using this method. In addition, no external tuning is needed for the system. The new technique is based on instantaneous spectral estimation using the fast Fourier transform whereby the speed -dependent slot -ripple harmonic frequency is determined. By using MATLAB/SIMULINK, this paper is mainly concerned with the extraction of the speed information contained in the rotor slot - ripple harmonics created in the airgap of the induction motor using digital signal - processing techniques. Whatg more, the speeds computed under different frequencies of PWM inverter are satisfactory.