无传感器测量电机转速的新方法

在阻抗和谐波分析的基础上,提出了感应电机无传感器检测的谐波导纳法,并成功地应用于电机转速检测.该方法基于导纳测量和快速傅里叶变换,给出了一种获得谐波导纳的计算方法并利用谐波导纳提取转速信息.由于导纳被定义为电流和电压之比,是电机系统固有的属性,不依赖于电流或电压本身,因而有较强的抗干扰能力.实验研究结果证实了其有效性,特别是在传统的电流法失效的情况下,应用谐波导纳法仍能提取令人满意的转速谐波.

Novel Method for Motor's Sensorless Speed Detection

Based on the impedance theory and harmonic analysis,a harmonic admittance signal processing method for sensorless condition monitoring of induction motor systems was presented.It was successfully ap- plied to detect the speed of induction motors.Based on admittance measure and fast Fourier transform,this method gives a way to obtain harmonic admittance and uses harmonic admittance to detect speed.Being inde- pendent of the current or voltage signal,the harmonic admittance method is immune to external disturbance. The experimental result shows that the proposed method is effective and acceptable speed estimation could still be achieved when the traditional current based method fails to work.