用于开关磁阻电机驱动系统的新型单电阻电流采样技术

摘要

为进一步降低开关磁阻电动自行车设计成本,提出了单电阻电流采样的四相电流重构技术.对单电阻电流采样的四相电流重构技术的原理进行研究,建立了不同开关状态下四相电流与采样电流的关系.对换相而引起的非换相相电流波动问题进行分析,定义了无法重构相电流的区域为非观测区.提出使用单脉冲注入控制解决非观测区内无法重构相电流的方法,通过在非观测区注入单个脉冲信号,依据直流母线电压值重构得到相电流,并根据给定电流参考量,计算得到脉宽调制补偿信号的占空比,从而实现在非观测区的斩波控制.建立了Matlab/Simulink数字仿真模型,并进行仿真验证,最后进行了开关磁阻电机单电阻电流采样及控制算法的实验.结果表明,所提单电阻电流采样技术具备可行性和使用价值.%In order to make further efforts to reduce the cost of switched reluctance electric bicycle, a novel four phase current reconstruction method based on single current sensor is proposed.The principle of four phase current reconstruction technique is studied, and the relationship between the four phase current and the sampling current in different switching situation is set up.Based on the analysis of the non commutation phase current ripple when commutate the phase, the region in which the phase current is unable to reconstruct is defined as non-observation area.A novel method using single pulse injection control strategy for solving the problem of reconstruct phase current in non-observation area is proposed.By inserting single pulse signal in the non-observation area, according to the reconstruct voltage value of dc-link, the phase current is reconstructed.Then the duty ratio of PWM is thus calculated based on the current reference to effectively achieve chopper control in non-observation area.Finally, the Matlab/Simulink digital simulation model is established and the experimental results show this method is feasible and valuable.