The elaborate error analysis of synchronous frequency measurement method is presented and some amelioration of the method based on the analysis is proposed.
对同步测频法进行了详尽的误差分析并由此对该方法做了改进。
The two signal sources are jointly controlled to produce a three-item square-wave pulse synchronous frequency conversion and voltage regulation signal source.
两信号源统一控制便产生三项方波脉冲同步变频调压信号源。
Through analyzing its work principle, we find the method to raise the speed: use a novel CMOS dynamic D flip-flop and an improved synchronous frequency divider.
分析了双模前置分频器的工作原理，提出了提高其工作速度的方法，包括给出一种新型高速CMOS动态D触发器的设计以及同步分频器的改进。
Color synchronous signal is setup to resume subcarrier color signal as same frequency and phase in receive end, which is suppressed in send end.
色同步信号是为了在接收端恢复与发送端被抑制掉的色副载波同频同相的载波而设置的。
The voltage converter works in PWM mode. Frequency-control speed regulation, DC voltage supply monitoring of the converter, synchronous motor power-angle close-loop control are combined.
控制策略为逆变器PWM调压、变频调速结合逆变器直流侧电压闭环、同步电动机功角闭环控制。
Driving is mainly regulated by frequency converter, with high driving accuracy of synchronous belt.
主传动采用变频调速。同步带传动，传动精度高。
Time domain synchronous averaging can reduce the signal not coherent to rotation frequency effectively, and extract the repetitive signals directly related to machine operation condition.
而时域同步平均可以有效衰减与回转频率无关的干扰，提取与工作状态直接相关的周期信号。
The method of single asynchronous generator's frequency and voltage control is fit to synchronous station absolutely, offering technical support to the development of the distributed generation.
孤立运行异步发电站的频率和电压控制方法必然可以在孤立运行的同步发电站中应用，为分散能源的开发提供技术支持。
Not only high power factor synchronous motor, and its speed is independent of the load, depends only on grid frequency.
同步电动机不但功率因数高，而且其转速与负载大小无关，只决定于电网频率。
The method consists of real-time estimation of signal frequency, synchronous tracking of sampling frequency and error correction of harmonic coefficients.
该方法包括信号频率实时估计、采样频率同步跟踪和谐波系数误差校正几个要素。
A quasi-adaptive frequency synchronous mechanism based on an orthogonal sinusoidal correlation receiver is proposed.
在正交正弦相关接收机基础上提出了一种准自适应频率同步方法。
Based on the complex magnitude of harmonic signals and under the condition of ideal synchronous samplings, an algorithm for computing the frequency deviation is proposed.
在理想同步采样的条件下，提出了一种基于简谐信号复幅度的频率偏差求取算法。
Because the AC asynchronous motor 'synchronous speed is determined by the frequency, we can control the AC asynchronous motor' speed by changing the supply power's frequency.
交流变频调速系统是利用异步交流电动机的同步转速随频率变化的特性，通过改变电机的供电频率而进行调速。
It's significant to study the regulation of active power of three-phase synchronous generator by way of the alternating power source of three-phase industrial frequency.
三相同步发电机作为三相工业频率的交流电源，研究其有功功率调节具有重要意义。
Frequency tracking means that sampling intervals of following sampling is updated according to new frequency estimation, so synchronous sampling error will be reduce step by step.
频率跟踪就是依据前一次频率估计修改下一次采样的采样间隔，从而使同步偏差越来越小。
The frequency changing start up process of generating unit actually is a synchronous driving process under the action of electromagnetic moment of the stator and rotor of motor.
机组变频起动过程，实际上是电动机依靠定子和转子的电磁力矩作用的同步驱动过程。
The paper introduces some experience in anti-interference for design and parallel operation of small intermediate frequency three-phase synchronous generator with active load.
本文介绍了带有源负载时，小型三相同步中频发电机的设计和并联运行时抗干扰方面的一些经验。
According to the requirements of synchronous speed control of series conveying belt, several patterns which could realize the synchronous speed control under frequency conversion was analyzed.
针对多级胶带输送机同步运行要求，分析了胶带机变频拖动同步运行实现的几种模式。
A novel fundamental frequency and initial phase detection method based on DSP is proposed, which can be used to get synchronous fundamental frequency voltage or current signals of power system.
提出了一种基于数字信号处理器的基波相位和频率校正检测方法，可用于电力系统中电压或电流基波分量同步信号的获取。
Next, it puts forward a new permanent magnetism synchronous machine rotor initial point estimate method - High frequency signals injection method.
其次，探讨了一种新的永磁同步电机转子初始位置估算方法——高频电压信号注入法。
The continuous model is adopted in the torsional vibration frequency and resonance of shaft system, the lumped parameter equivalent applied in the sub-synchronous resonance.
轴系扭振频率和响应计算采用连续质量模型，次同步谐振特性分析采用集中质量模型。
The system implements intellectualized transducer setting signal synchronous display in time and frequency domain as well as other multiple signal processing functions.
该系统利用软件实现了智能化的传感器设置、实时采集时的时域信号、频域信号同时显示和多种数据处理分析的功能。
It tells that the large-scale synchronous machine using the frequency conversion speeder, might reduce the machinery wearing, enhances the equipment reliability.
通过分析可知，大型同步电机采用变频调速装置，可降低机械磨损，提高设备的运行可靠性。
Studies of a series of cigarette machines of advanced industry countries, a machine equipped with many frequency conversion synchronous motors and step-by-step motor etc.
先进工业国家的现代烟草机械常常是一台机械上装备有一系列变频调速同步电动机与步进电动机等。
The thesis presents the design and realization of a data synchronous acquisition system in integrated protection based on FPGA and digital frequency multiplying technique.
本论文的任务是设计并实现基于FPGA及数字倍频技术的集成保护中数据同步采集系统。
Fixing power system stabilizer on the governor of synchronous generator is an effective method to restrain low frequency oscillation.
在同步发电机组调速器侧装设电力系统稳定器是抑制电力系统低频振荡的有效措施。
Moreover, synchronous switch is applied to the system in order to complete the smooth switch on condition that frequency and phase of inverter power and power supply are the same.
同时利用同步切换控制实现水泵由变频电源向工频电源的平稳切换。
Search efficiency is improved by embedding synchronous signals into time domain. Better robustness is achieved by hiding the watermarking into the low frequency coefficient of DWT domain.
同步信号嵌入时域，以提高搜索效率，水印隐藏在离散小波变换域的低频系数中，以达到较好的鲁棒性。
In order to realize synchronous control, distributed motor synchronous control system based on PLC and frequency conversion and PID control arithmetic are adopted.
本文提出了基于PLC和变频调试技术的集散式同步控制方案和采用PID控制算法实现多电机的同步控制。
In order to realize synchronous control, distributed motor synchronous control system based on PLC and frequency conversion and PID control arithmetic are adopted.
本文提出了基于PLC和变频调试技术的集散式同步控制方案和采用PID控制算法实现多电机的同步控制。
应用推荐