基于转子高频脉动电流注入的同步电动机无位置传感器型直接转矩控制  

Sensorless Direct Torque Control for Synchronous Motors Based on Injection of High-frequency Ripple Currents Into the Rotor Winding

作　　者：周扬忠[1] 龙世鹏[1] 

机构地区：[1]福州大学电气工程与自动化学院,福建省福州市350108

出　　处：《中国电机工程学报》2015年第1期223-230,共8页Proceedings of the CSEE

摘　　要：为了实现直接转矩控制电励磁同步电机(electrically excited synchronous motor,ESM)驱动系统零转速及极低转速时无位置传感器运行,提出一种新型转子位置角观测器。首先在转子回路注入高频脉动电流;其次,为了仅在d轴方向产生定子高频脉动电流,利用电磁转矩闭环在电磁转矩中注入同频率的高频脉动分量;最后借助于锁相环原理观测出转子位置角。利用磁链的电流模型和观测位置角,计算出定子磁链及电磁转矩,并构建无位置传感器直接转矩控制系统。实验结果表明所提无位置传感器驱动系统任何负载时均可以稳定运行于零转速及极低转速。A novel rotor position angle estimator is proposed to achieve zero and very low operating speed for a sensorless direct torque controlled electrically excited synchronous motor （ESM） drive. Firstly, high-frequency ripple currents are injected into the rotor circuit, and secondly, using the torque close-loop, the high-frequency component is injected into torque to produce high-frequency stator currents only in the d-axis direction. At last, the rotor position angle is estimated with the phase-locked loop principle. The stator flux and torque are calculated with the stator flux current model and the estimated rotor position angle, and then the sensorless direct torque controlled ESM drive is constructed with estimated flux and torque. The results of experiments show that the proposed sensorless drive system can operate at the zero and very low speed under any load.

关 键 词：电励磁同步电动机 直接转矩控制 无位置传感器 转子高频脉动电流 

分 类 号：TM341[电气工程—电机]