摘要
为使系统模型更接近物理实际并易于仿真实现,提出一种新颖的无刷直流电机转速、电流双闭环控制系统建模仿真方案。无刷直流电机导通运行过程中,定子绕组端点电压受电机内部状态和逆变器状态的多个因素综合影响。而Matlab SimPowerSystem Toolbox三相全桥逆变器模块的输出电压,与电机内部物理量无关,不适用于无刷直流电机导通方式的建模。在对电机和逆变器工作过程分析基础上,编写S函数对逆变器和直流母线电流建模,并将仿真结果与系统实验结果进行对比验证,证明该仿真方法的正确性。提出一种低成本的直流母线电阻电流采样方案,在不增加硬件成本前提下,仅利用一个采样电阻便可实现力矩电流的较精确检测。该方案能有效提高系统的控制精度。
To make the simulation model closer to reality and easy to realize, a novel brushless DC Motor （BLDCM） modeling and simulation scheme are proposed. The BLDCM control system has two regulators which are used to control the speed and current of the motor. In the conduction mode, the motor stator windings terminal voltage is impacted by a number of factors, such as motor internal states and inverter states. The power electronic module in SimPowerSystem Toolbox of Matlab Simulink is replaced by a self-built inverter module using S function. The methods of electromagnetic torque estimation and current sampling are improved based on a sampling resistor. This improved sampling method needs no more hardware cost. Simulation and experimental results verifies that the proposed model and control strategy are correct and effective.
出处
《中国农村水利水电》
北大核心
2009年第9期141-143,共3页
China Rural Water and Hydropower
基金
国家自然科学基金(60874014)
江苏省研究生培养创新工程(CX07B_117z)
关键词
无刷直流电机
仿真建模
电磁转矩
逆变器
电流采样
BLDCM
modeling and simulation
electromagnetic torque
inverter
current sampling
