Based on the theory creation of space voltage vector ' s polygonal flux linkage locus , freewill partition of the ideal flux circle is realized by the software method . furthermore , different polygonal flux linkage locus ' s fluent switching point is also found , which overcomes the motor " switching failure and improves the speed adjusting dynamic performance 在充分研究磁通轨迹法原理的基础上，采用软件方法实现了任意多边形磁链轨迹的生成；并找出了不同磁链轨迹间的平滑切换点，解决了切换时的电动机失步问题，提高了系统转速调节的动态性能。
In fact , the running and starting process of synchromotors are often affected by such factors as electrical , mechanical and hydraulic factors as well . as the magnitude of interference amounts to a certain degree , that is to say , above the stability limitation for the synchromotors , it will cause fall - out of the synchromotors , interrupting of the running or damage to the pumping system 另外，大泵站同步电机起动及运行过程中，常有电力的、机械的、水力的等因素干扰，当扰动的幅度或量值大到一定程度，超出电机的稳定极限时，会引起电机失步，造成泵机组运行中断及设备损坏事故。
The dynamic simulating system used to do the research of governor control had been established by the device . the dynamic simulating tests of gahc used on steam turbine and hydro turbine had been done with the device . the tests were three phases short circuit , restoring synchronous operation and restraining low frequency oscillation in three - machines system 利用该装置对gahc在汽轮发电机和水轮发电机上的控制进行了以下动模实验：单机无穷大系统中三相短路故障实验和发电机发生失步故障后的再同步实验、三机无穷大系统中抑制低频振荡的动模实验。
And the solutions of the three problems above are discussed : the solution to the simulcast interfering which is caused by the simulcast delay spread ( sds ) and the zero - beating is given in chapter four . based on the well understanding of the principle of ms - i / h / 0 in ipnp , the examples are given in chapter five on how to solve the problem of communication interruption between paging zones . through the analyse of signal switching between chengdu and deyang , the synchronization error between flex frames , and the bug in the multi - frequency roaming principle are pointed out 通过以上分析，文章探讨了对上述三个问题的解决： ?对同播干扰问题，分别分析了时延差和零拍频所造成同播干扰的客观存在，探讨了系统设计和网络优化的基本方法； ?对ipnp联网障碍，提出了在掌握ipnp对各pncc作为输入局归属局?输出局( ms ? i h o )的灵活定义、以及相关参数配置原理的基础上，分析联网障碍的思路； ?对信号切换障碍，以成都和德阳两地的局部广域覆盖为例，分析了flex帧失步和flex多频漫游原理设计缺陷的客观存在，并探讨了相关的解决方法和建议。
In the part of platform designing , proper peripheral chips are chosen according to the audio signal format . and how to achieve channel synchronization in the receiving part is an important aspect of wireless transmission system . in order to solve this problem , three algorithms are used ; those are scramble / descramble , improved over - sampling , and frame synchronization protocol 在硬件验证平台的设计部分,文章根据音频信号的特点选择了适当的外围芯片,并且针对无线传输接收端的同步问题,采用了三种算法来减少失步现象,即扰码/解扰算法,改进型的过采样算法,以及帧同步协议。
The analysis and research of the starting and running of the synchromotors iii many large pumping stations and the working condition of excitation system have indicated that the causes leading to damage to the motor or difficulties in starting are relevant to the poor technical characteristics of the equipped excitation system , especially resulting from the frequent restarting after failure to start the motors and the failure to protect or protect the synchromotors improperly in the fall - out 通过对大泵站同步电机起动、运行及励磁装置工作状况的分析和研究，结果表明：导致同步电机损坏及起动困难的原因与电机所配励磁装置保护技术性能不完善有关；特别是先期起动失败后再多次频繁起动及运行失步时未起保护作用或保护不到位造成。
The main characters of the design are summarized as follow : 1 . each mmdb module is mapped with a data buffer which is used to track the unsynchronized record . when system uploads the data to the mmdb , our system will adopt the round - robin fashion to distribute the data to each module , thus could effectively reduce the load of the foreground system 针对上述难点采用以下方式对系统进行了优化,有效的保证系统的实时性和可靠性: 1 .数据上载时采用失步缓冲区和内存库一一对应的关系,对每个内存数据库数据定时循环上载,减少对单个数据库的负荷,有效的控制上载流量和速度,防止在上载数据过程中系统负荷过大影响业务操作。
First , a pmsm direct torque control method based on svpwm is studied . and a good control effect of the flux and the torque is gained according to selecting the six voltage space vectors . and in simulation , this control method consider the circs that the angle between the stator and the rotor is bigger than 90 degrees , which restrains steps losing of synchronous motor effectively 首先研究了基于svpwm (空间矢量pwm )的永磁同步电动机直接转矩控制方法，通过对六步电压空间矢量的综合控制，可以得到比较满意的磁链和转矩控制效果，而且仿真中充分考虑了定转子夹角大于90度的情况，有效地限制了同步机的失步问题。
It elaborates on the 3 - step start technique . i adopt the method which permits the bldc motor to automatically search the best time to change its operation stage from a separately controlled synchronous one to a self controlled one using the back emf as the commutation signal . this method prevents the stepping out and stopping problems in the changing procedure of the motor 阐述了电机的三段式起动方法，在直流无刷电机由起动阶段外同步运行切换到反电势换向自同步运行的过程中采用了自寻最优点切换的方法，保证了电机在切换过程中不会发生失步和停转现象。
The dissertation gives a profound and extensive theoretic research of starting process , causes of fall - out and damages caused by fall - out as well as the electromagnetic process in large pumping station . the ? qual area criterion ? is used in this research to analyze the stability limitation of the synchromotors fall - out in detail . in the end , the study also puts forward a couple of practical methods to prevent synchromotors from fall - out and corresponding solutions to the fall - out 本文主要内容是：围绕大泵站同步电机起动过程、运行中的失步机理及危害、失步时电磁物理过程等方面进行了细致深入的理论研究；用“等面积定则”分析大泵站同步电机失步的稳定界限并提出求解方法；提出预防同步电机失步的措施。
