五相感应电机无速度传感器DTC研究

Study on Speed Sensorless Direct Torque Control of Five-Phase Induction Motor

五相感应电机直接转矩控制系统中电压矢量选取与优化相比三相电机具有更大的灵活性和复杂性,为有效对其进行调速控制,详细分析了五相感应电机直接转矩控制中空间电压矢量,提出了一套无速度传感器调速控制方案．在控制系统中,对定子电阻进行了在线辨识,以提高磁通观测精度,然后以定子电流定向,推导出一套速度辨识算法,该算法具有较高的速度估计精度并且易于实施．最后的仿真试验结果表明,提出的控制方案在理论上和实际上是可行的．图8,表2,参10．

The space voltage vector selection and optimization have more flexibility and complexity for the additional voltage vectors in five-phase induction motor direct torque control system. In order to control motor speed efficaciously, a whole direct torque control scheme was presented based on the analysis of space voltage vector on five-phase induction motor. In this system, stator resistance was identified online to improve stator flux estimation precision. Then, a speed estimation method was presented based on stator current vector orientation, which had the characteristics of high precision and easy to implement. A simulation experiment was carried out, it indicated that control scheme is right and practical. 8figs., 2tabs., lOrefs.