基于母线电流重构的空心杯BLDCM无位置传感器换相误差闭环补偿方法  

Commutation error compensation method based on DC-link current reconstruction for a coreless brusheless direct current motor without a rotor position sensor

作　　者：金浩[1] 高涵 王飞飞[1] 高荣科 JIN Hao;GAO Han;WANG Feifei;GAO Rongke(College of Control Science and Technology,China University of Petroleum(East China),Qingdo 266580,China)

机构地区：[1]中国石油大学(华东)控制科学与工程学院,山东青岛266580

出　　处：《实验技术与管理》2024年第2期98-105,共8页Experimental Technology and Management

基　　金：国家自然科学基金项目(62303490,52305595);中国石油大学(华东)自主创新科研计划项目(27RA2205012);中国石油大学(华东)校级教学改革项目(CM2022068)。

摘　　要：为精确补偿无刷直流电机无位置传感器的换相误差,分析了换相误差与重构母线电流积分的相关性,设计了母线电流重构及滤波电路,得到了双重构母线电流在每个换相周期的积分值,并以电流积分差值作为换相误差表征量建立了闭环补偿控制系统,利用控制器输出量补偿换相误差,实现了换相信号相位的高精度闭环校正。相比传统方法,所提出的硬件电路可精确构建母线电流积分,准确表征电机换相误差,提高无刷直流电机的运行效率。最后通过搭建磁悬浮飞轮系统验证了所提方法的有效性。[Objective]The integral commutation error compensation method demonstrates strong performance in suppressing highfrequency noise.However,its effectiveness diminishes at high motor speeds.This paper addresses the limitations of integral compensation accuracy owing to sampling frequency and the presence of commutation misalignment.After analyzing the relationship between commutation error and the DC-link current waveform,a closed-loop control system is constructed using DC-link current characteristics.Consequently,we propose a commutation error correction method based on DC-link current reconstruction.[Methods]Given the negligibly small phase inductance of the coreless stator structure,this study analyzes the symmetry characteristics of DC-link current waveforms.In a commutation cycle,the difference in the area on both sides of the symmetry axis of the DC-link current waveform directly correlates with the magnitude of the commutation error and can be used as a characteristic parameter for commutation error.Moreover,the integration link can attenuate high-frequency disturbances,while higher values provide a more accurate error quantification.To divide the DC-link current with the symmetry axis as the boundary,we combine the three-phase commutation signals to produce a logic signal.By delaying this logic signal and performing an XOR operation on the pre-and post-delay logic signals,we construct a window signal.This window signal can be used as a control signal for two analog switches simultaneously.The DC-link current,once passing through the analog switches,is split into two parts.To avoid the accuracy problem of software integration at high speeds,we obtain the area value of these two signals through hardware depth filtering.These values are sampled by the controller and subtracted to obtain the error characterization parameter.This parameter serves as the feedback to establish the commutation error PI controller.The PI controller calculates and generates the error compensation amount,which is subsequently used to

关 键 词：无刷直流电机 无位置传感器换相 换相误差补偿 

分 类 号：TH165[机械工程—机械制造及自动化]