查询词典 synchronous

A study on the identifiability of synchronous generator parameters.

同步电机参数的可辨识性研究。

The presented diagnosis approach was validated by induction motor variable voltage and variable frequency control system as well as permanent magnet synchronous motor field-orientation vector control system.

为保障诊断的有效性和可靠性，提出采用开关信号上升沿延时的方法来避免因IGBT开通和关断延迟造成的误诊断，并给出延时时间的确定方法。

ABSTRACT Aiming at problems of trans-vector controller in a vehicle-carried induction motor such as variable rotor and stator resistance following motor temperature, and their inductance varying with flux saturation degrees. Firstly, CSI and VSI are introduced, for CSI, it can hold the advantages both FOC and DTC using stator flux directional, PI parameter and simulation are also introduced. Secondly, equations of IM in the synchronous rotary frame and its static counterpart, as figuring in the saturation condition of magnetic field, are dealt in this paper and the simulation results are presented. Thereafter, the parameter designing of PI trans-vector controller is processed, which features the non-linear model. In practical realization, as neglecting the dynamical change of motor inductance, this paper employs online modification of inductance parameters, according to the flux saturation, then transforms the non-linear equations into linear ones, and so compacts the structure of controller. Thirdly, in view of the maximum torque output is extraordinary requisite when Electrical Vehicle start up, accelerate, and overtake, this paper issues the maximum torque when both inverter and battery capacity is corporeally definite. Fourthly, on-line differentiating and analyzing both rotor's time constants and its flux by using the expanding order reduction and discrete Kalman filter equation are fathomed, in order to realize high-performance trans-vector algorithm, and also the simulation results are presented. Fifthly, the close-loop regenerative brake system, when the EV's torque is set constant, is deduced; at the same time, unification of electric drive model and brake model is executed. Combined with maximum charge current demands, the mathematical model for online yielding torque as a demand.

本论文针对车载异步电机在矢量控制器所遇到的问题：定转子电阻随温度变化及随电机饱和程度变化的转子电感及定子电感而影响电机调速性能提出一套完整的解决方案：分析了电流型逆变器和电压型逆变器在实现矢量控制时控制器参数的计算，分析出对于电流型逆变器在采用定子磁场定向时，其性能同时具有矢量控制和直接转矩控制两者的优势，并对电压型逆变器在转子磁场定向下的模型进行了仿真研究；建立异步电机非线性模型，推导出考虑磁饱和时异步电机在同步旋转坐标系及静止坐标系下的方程，并做出了仿真结果，建立异步电机在非线性模型下的矢量控制调节器的PI参数设计，在实际应用中，若忽略电机电感的动态变化，可以根据当前的磁路饱和状态而在线修正电感参数，从而将非线性方程线性化，降低控制器的复杂度；考虑到电动汽车在起动和加速超车时需要电机有最大转矩输出，本文讨论在逆变器容量一定和电池供电能力有限的情况下电机最大转矩输出问题；推导了异步电机扩展降阶、离散卡尔曼滤波方程在线辨识转子时间常数和转子磁通，用于实现高性能的矢量控制算法，并给出了仿真结果；推导出了电动汽车恒转矩给定的闭环回馈制动系统，实现了电动控制模型和制动模型的统一，而且结合铅酸电池最大充电电流的要求，为制动转矩在线给定建立了数学模型；设计了基于双DSP系统的高性能矢量控制器软硬件框图，并以大量实验数据说明矢量控制在电动汽车应用的实际应用状况。

Do you mean that's the difference between synchronous generator and induction generator.

你的意思是，那就是同步发电机与异步发电机间的区别吗？

And the model of synchronous generator is considered the most important factor which influent the simulation results.

随着电力系统规模的日益庞大和复杂，电网抵抗各种大干扰的能力越来越受到重视。

Finally, on the basis of the practice that has been done, we propose a framework of software process management system based on CORBA to solve the problem of synchronous control over the inhomogeneous network.

最后在现有实践的基础上，为了解决异构平台及网络环境下的协同控制等问题，给出了基于CORBA的过程管理系统的整体框架。

Having finished items we planned, as following study, we have tested some x-ray compound lenses on Beijing synchronous radiation facility in February, 2005. The measured results are basically inosculation with the design results.

3在完成项目预定计划任务之后，作为后续研究，2005年2月在北京同步辐射光束线上对制作出的部分组合透镜进行了聚焦性能测试，实测结果与设计结果基本吻合。

Excitation system of synchronous generator contains saturation element for effect of practical actuator, which has characteristic of input saturation nonlinearity.

同步发电机励磁系统由于受到物理结构的限制，系统输入含有饱和环节，具有非线性特征。

Based on instantaneous power analysis, an instantaneous power control method of permanent magnet synchronous machine is proposed in this paper.

基于对电机输入瞬时有功无功功率的分析，提出一种新的永磁同步电机瞬时功率控制方案。

In the process, the instantaneous speed of the drive system is higher than the instantaneous synchronous speed because of the inertia of the drive system.

为 了使拖动系统停止，逐渐减小频率；此时，由于惯性的缘故拖动系统的瞬时速度比同步瞬时速度要高。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失