【作者】 刘亮；

【导师】 陈昊；

【作者基本信息】 中国矿业大学 ， 电气工程（专业学位）， 2022， 硕士

【摘要】 开关磁阻电机结构简单、容错力强且拥有成本低的优势,所以在各行各业都得到了广泛的应用。由于各行业的需求,对开关磁阻电机驱动系统的鲁棒性、稳定性的要求越来越高,所以开关磁阻电机驱动系统的可靠性研究就越来越急切。本文以四相8/6结构的开关磁阻电机为基础,探讨开关磁阻电机的可靠性、重要度和薄弱环节可靠性的提高方法。本文建立了开关磁阻电机驱动系统的传统Bell故障树的可靠性模型和改进的T-S多状态故障树模型,给出了两种可靠性模型的可靠性评估方法,同时对开关磁阻电机驱动系统的故障进行分析,然后定量评估了传统不对称半桥(Asymmetric H-bridge,简称AHB)拓扑结构的功率变换器拓扑下四相8/6结构的开关磁阻电机驱动系统的可靠性。本文采用重要度评估来分析系统的薄弱环节,为提高系统的可靠性提供参考依据。给出了基于T-S故障树模型的元器件结构重要度、概率重要度和关键重要度的算法,同时将T-S故障树模型转化为更为形象的贝叶斯网络模型来求解重要度,并对开关磁阻电机驱动系统元器件的概率重要度和关键重要度进行评定。基于重要度的评估结果,本文确定了MOSFET开关管为系统的薄弱环节,因此给出了一种在线故障诊断算法。通过在传统AHB功率变换器的拓扑分离出母线励磁电流,通过比较母线励磁电流和参考电流与相电流的差值,实现了开关磁阻电机驱动系统MOSFET的在线诊断,避免了故障的传递,为提高开关磁阻电机驱动系统的可靠性提供了指导依据,可以及时更换受损器件,保障系统安全稳定运行。最后对本文工作进行总结,同时提出本文存在的不足和后续工作计划。本文有图54幅,表17个,参考文献117篇。更多还原

【Abstract】 Switched reluctance motors have the advantages of simple structure,strong fault tolerance and low cost of ownership,so they have been widely used in all walks of life.With the fast development of related industries,the requirements for the robustness and stability of the switched reluctance motor drive system grow rapidly.It is necessary to study on the relability research of the switched reluctance motor drive system.This acritical builds upon the four-phase(8/6)switched reluctance motor,to discuss the reliability,importance of the switched reluctance motor,and look for ways to improve the reliability of the weak link.In this thesis,the traditional Bell fault tree reliability model and the improved TS multi-state fault tree model of the switched reluctance motor drive system are established,and the reliability evaluation methods of the two reliability models are given.Then,the reliability of the four-phase(8/6)switched reluctance motor drive system under the power converter topology of the traditional asymmetric half-bridge(AHB)topology is quantitatively evaluated.This thesis adopts the importance evaluation to analyze the weak links of the system,and provides a reference for improving the reliability of the system.The algorithm of component structure importance,probability importance and key importance based on the TS fault tree model is given.At the same time,the TS fault tree model is transformed into a more vivid Bayesian network model to solve the importance,and the switch is analyzed.The probabilistic importance and critical importance of the components of the reluctance motor drive system are evaluated.Based on the evaluation results of the importance,this thesis determines that the MOSFET switch is the weak link of the system,so an online fault diagnosis algorithm is proposed.By proposing the bus excitation current in the topology of the traditional AHB power converter,and by comparing the bus excitation current and the difference between the reference current and the phase current,the online diagnosis of the MOSFET of the switched reluctance motor drive system is realized,which avoids the transmission of faults.The reliability of the switched reluctance motor drive system provides guidance,and damaged components can be replaced in time to ensure the safe and stable operation of the system.Finally,the work of this thesis is summarized,and the shortcomings of this thesis and the follow-up work plan are proposed at the same time.There are 54 figures,17 tables and 117 references in this thesis.更多还原