两象限斩波器调压的无刷直流起动发电机研究

无刷起动发电机由双向变换器与同步电机构成，由于具有起动、发电双功能而成为机载电气技术研究的一个热点。该文研究基于两象限斩波器调压的无刷直流起动发电机系统的主电路扩拓与原理，起动机的起动持性以及发电机的调压特性与外特性，最后以实验室一台同步电机为例构成无刷直流起动发电机原理实验系统，实验结果表明该系统具有良好的起动、发电性能。     

双凸极无刷直流起动发电机研究

电励磁双凸极无刷直流发电机配以起动功率变换器就构成了起动发电机，与开关磁阻起动发电机一样均具有可在高温高速下工作的能力。本文分析了该起动发动机的基本原理，标准和换相提前控制时的机械特性和机械特性的合成方法，减小转矩脉动和输出电压脉动的方法，比较了有刷与无刷两种电机起动航空发动机的试验结果。试验表明：电励磁双凸极电机是一种性能较好的航空用起动/发电机。     

气隙结构对单相无刷直流电动机双向起动性能的影响

许多应用中要求单相无刷直流电动机具有良好的双向运行性能。相对于多相无刷直流电动机,单相无刷直流电动机的双向起动比较困难。为了研究不同气隙结构对单相永磁无刷直流电动机双向起动性能的影响,首先研究了常用的渐变式气隙结构的单相无刷直流电动机的双向起动性能,并对电动机的定子结构进行改进,研究了薄端倾斜的渐变式气隙结构单相无刷直流电动机的双向运行起动性能。仿真和实验证明薄端倾斜的渐变式气隙结构单相无刷直流电动机具有更优越的双向起动性能。     

电动汽车用永磁无刷直流电机的控制与驱动

提出了电动汽车驱动系统用永磁无刷方波直流电机的双向控制方法,研究了电流型ＡＣ／ＤＣ双向变换器的构成方案。     

电动汽车用永磁无刷直流电机的控制与驱动

提出了电动汽车驱动系统用永磁无刷方波直流电机的双向控制方法,研究了电流型ＡＣ／ＤＣ双向变换器的构成方案。     

电子变换器调压的无刷直流发电机PWM控制模式及其对电压脉动的影响

介绍了一种由同步电机和全波升压式C－dump变换器构成的新型无刷直流发电机的工作原理,详细分析了发电机的PWM调压模式及其对电压脉动的影响,在此基础上提出了可改善输出电压脉动的PWM控制方案。数字仿真与系统实验验证了理论分析的正确性。     

新型十二相永磁无刷直流发电机容错性能研究

阐述了新型十二相永磁无刷直流发电机的结构原理,系统分析了该无刷直流发电机的相绕组开路故障工作模式和容错特性。建立了永磁无刷直流发电机的有限元仿真模型,并完成场路耦合分析。先对容错特性的工作和故障状态进行理论分析,再通过建模仿真和原理样机试验结果验证了新型十二相永磁无刷直流发电机具有较强的相绕组开路故障容错特性。     

开关磁阻组合起动机/发电机设计及试验

开关磁阻发电机是一种与传统发电机有本质差异的新颖无刷直流发电机。针对磁阻电机、功率变换器和控制器彼此强耦合且气隙磁场剧烈往复变化、相绕组集励磁储能与续流发电双重功能等特征,提出了融电磁结构参数预估、相磁链空间数值分析及稳、动态性能仿真于一体的集成ＣＡＤ方法,研制了４ｋＷ开关磁阻组合起动机／发电机并按照飞机供电标准进行稳态品质试验、突加突卸载及变速瞬态特性试验、组合起动／发电试验和容错发电试验,给出     

开关磁阻起动/发电机功率变换器拓扑

介绍了开关磁阻无刷直流、交流起动/发电机的功率变换器拓扑结构,给出了8kW、12000r/min直流发电机原理样机的设计、仿真及试验结果。     

航空电励磁双凸极无刷直流起动发电机系统控制关键技术综述

电励磁双凸极电机具有结构简单可靠、容错性能好、控制灵活等优势,可构成一种具有竞争力的新型航空无刷直流起动发电机系统。简述了电励磁双凸极起动发电机系统的构成及其工作原理。针对航空电源这一特殊应用领域的要求,对电励磁双凸极起动发电机高可靠性控制、高效率高功率密度控制、集成化控制等关键技术进行了归纳总结。讨论了电励磁双凸极起动发电机控制关键技术的未来发展趋势。     

一种新型双凸极起动发电系统电压调节器设计

对新颖的无刷电机-电励磁双凸极电机起动发电系统进行了研究,用它取代有刷直流起动发电系统有重要意义。讨论了双凸极起动发电系统的构成及原理,并为所研制的QFW-18样机设计出一种简便可靠、控制灵活的电压调节器。实验结果表明,调压器实现了良好的调压、保护性能,而且在电机电动状态运行时可有效地控制电机的励磁,使其获得更好的起动性能。     

双凸极起动/发电机系统建模与瞬态特性分析

现有的电磁式双凸极电机的建模与特性分析分别单独从起动状态和发电状态两个方面进行,而独立的起动机和发电机模型难以完整、准确的反映起动/发电整个过程,尤其是起动/发电切换瞬态过程。在MATLAB软件中将SIMULINK和SimPowerSystems相结合,提出了非线性电感下起动/发电机一体化建模的方法,建立了电磁式双凸极起动/发电机系统的一体化模型,分析了起动/发电各个阶段特性,重点分析了起动/发电切换过程瞬态特性。仿真与实验结果验证了电磁式双凸极起动/发电机系统一体化模型和特性分析的正确性。     

Reliability Analysis of a Switched Reluctance Starter/Generator

In this paper, the combined k-out-of-n : G model and reliability block diagram model is used to analyze the reliability of a switched reluctance starter/generator system. First, the different operational modes of a switched reluctance motor starter/generator are analyzed, and the fault states of the system are briefly described. Then the fault criteria of the system in different operational states are put forward. Secondly, a reliability block diagram model is established to calculate the system-level reliability, and the k-out-of-n : G model is adopted to analyze the reliability of each part of the switched reluctance starter/generator system. To verify effectiveness, the first-order Markov model is also used to analyze the reliability of each part of the switched reluctance starter/generator system. Considering the computational complexity and accuracy of the system, the k-out-of-n : G model is more suitable for system component level reliability analysis. Finally, a 6/4 switched reluctance motor is used as the simulated and experimental platform motor. The final results verify the effectiveness of the reliability analysis model.     

Selecting Optimal Dimensions for a High-Temperature Aircraft Starter Generator

The notion of a more electric airplane figures strongly in the design of new aircraft. The task that has to be done is to integrate an electric machine directly with a high- and/or low-pressure aircraft-engine shaft. As a result, it is possible to reduce the engine’s weight–size parameters, attain better reliability and fuel saving, and cut down aircraft maintenance costs. To realize this, it is necessary to design a highly efficient high-temperature starter generator able to work in harmful environmental temperatures with minimal technological possibilities for cooling. This article presents a design of the starter generator with an external rotor for integration with a high-pressure aircraft-engine shaft. To attain better parameters and characteristics of the proposed design, optimization by multiple criteria in the Ansys Maxwell software package is conducted. The optimal dimensions of the SG with an external rotor are determined by genetic algorithms. The optimized starter generator has minimal weight–size parameters and high energy performance and works with minimal losses. The operability of the starter generator is assessed by computer modeling on the basis of which a test mockup is designed. The tests are conducted in no-load and loaded modes. The test results show the appropriateness of the selected design, the operability of the starter generator, and its efficiency for integration with the HP shaft.     

基于自关断器件的新型软起动

为了克服输入定子侧的低次谐波和控制复杂的问题，提出了基于自关断器件的新型软起动。与传统晶闸管控制的软起动不同，由于采用了自关断器件，因此新型软起动的控制简单，开关器件的触发信号不需要与主电路同步，容易实现，而且还能开环控制。分析了新型软起动的运行原理和定子上电压和电流的谐波特性，并给出了仿真结果。实验验证了新型软起动的正确性。     

开关磁阻起动/发电机设计方法研究

开关磁阻起动/发电机是电动机与发电机的结合体。提出一种将经典电机设计与最新有限元设计相结合的电机设计方法,该方法将传统设计方法的快捷、简便与有限元设计方法的精确、直观等优点相结合。并且采用以发电机性能为主,兼顾起动性能的设计方式;在多场有限元联合仿真的基础上,设计并试制了一台循油冷却开关磁阻起动/发电机。实验证明,该设计方法适合于该类型电机。     

开关磁阻起动发电机系统及其一体化控制方案

本文首先对开关磁阻起动/发电机的研究现状、系统的组成及方案选取原则进行分析，结合起动和发电过程中角度控制、斩波控制、脉宽调制控制三种控制方案特点，归纳出适合开关磁阻起动/发电机系统的一体化控制策略；最后给出部分试验结果及性能分析，研究表明：开关磁阻起动/发电机系统具有的结构简单坚固、控制灵活等特点，具备很高的容错运行能力、高能量密度和恶劣环境工作能力，在航空及汽车等领域有着良好的应用前景。     

核电厂发电机出口断路器失灵保护设计

核电厂发电机机端与升压变压器之间都装设发电机出口断路器,而且装设了发电机出口断路器失灵保护。文中分析核电厂发电机所配置的保护及其定值,发现发电机出口断路器失灵保护设计存在问题:某些启动跳发电机出口断路器、灭磁、关闭主汽门的电气保护,因电流判据不满足而不能直接有效地启动发电机出口断路器失灵保护;汽轮发电机组在程序跳闸过程中,发电机出口断路器发生故障而不能跳开,也不能启动发电机出口断路器失灵保护。对上述问题所造成的危害,文中提出核电厂发电机出口断路器失灵保护设计的改进措施,完善了核电厂发电机出口断路器失灵保护设计。     

Self-Excitation of Autonomous Generators. Part 2. Study of Self-Excitation of an Asynchronous Generator Inclusive of the Starter in the Form of Residual Voltage on Excitation Capacitors

This paper presents the results of simulations of the process of self-excitation of the asynchronous generator by using a starter in the form of residual voltage on excitation capacitors. A generator model that was developed in the three-phase inhibited coordinate system and implemented in MATLAB Simulink is described. The results of simulations have shown that the use of the starter in the form of residual voltage on excitation capacitors is initially accompanied by a high-frequency decaying oscillatory process that proceeds smoothly in an increasing oscillation process with the frequency of the EMF generator. The role of the starter in the launch of a self-excitation process is considered. It was found that, during self-maintained conditions, i.e., the presence of positive feedback, it is sufficient to have an arbitrarily small starter to start the process of self-excitation. In addition, the time of self-excitation of the generator can increase to “arbitrarily large” values. It is shown that, in the case of a violation of self-maintained conditions, a powerful starter can change the parameters of the generator up to the establishment of self-maintained conditions followed by the launch of an asynchronous self-excitation.