摘要
直接转矩控制方法的主要问题之一是电机在低速运行时有较高的转矩脉动.通过对转矩脉动的原因进行分析,得出低速运行时转矩滞环的幅值和转矩脉动直接相关,速度误差信号的变化是判断电机转矩脉动的一个很好指标,并设计了一种模糊逻辑转矩控制器,控制器输入是电流信号和速度误差信号的变化率,控制器的输出是转矩滞环振幅的增量,同时提出基于模糊逻辑滞环调节控制器的直接转矩控制方法.仿真结果表明,含有模糊逻辑滞环调节控制器的直接转矩控制系统能够减少电机运行过程中的转矩和磁通脉动,同时提高直接转矩控制系统在低速运行条件下的工作性能.
High torque ripple is a major problem when the motor is running at low speed in direct torque control system.By analyzing the causes of torque ripple,the following conclusions can be get that the change of the speed error signal is a good indicator to determine the situation of motor torque ripple.In this paper,a fuzzy logic controller has been proposed.The Inputs of the controller are the speed error signal and the change rate of current signal.The output is incremental value of the torque hysteresis amplitude.Dynamic adjustment of the torque hysteresis amplitude is the ultimate goal.The simulation results show that the direct torque control system with hysteresis amplitude adjustment fuzzy logic controller can reduce the process of motor torque and flux pulsation,and improve the performance of low-speed operating conditions in direct torque control system.
出处
《河北工业大学学报》
CAS
北大核心
2011年第3期62-65,共4页
Journal of Hebei University of Technology
基金
天津市科技支撑计划重点项目(09ZCKFGX03100)
关键词
模糊逻辑
转矩滞环
幅值可调
直接转矩控制
fuzzy logic
torque hysteresis
amplitude adjustable
direct torque control