This paper presents a double loop controller for VVVF.
介绍一种双闭环控制变频调速系统。
Some problems of energy saving with general VVVF inverter are expounded .
阐述了应用通用变频器节能中存在的一些问题；
The paper introduces the VVVF control method for single phase capacitor motor.
介绍单相电容电机变频调速的控制方法。
This stimulates us to research on VVVF asynchronous motors for AC driving rig.
相应地也带动了对交流传动钻机用变频调速异步电动机的研究。
The traction inverter provides VVVF three-phase ac voltage for traction motors.
牵引逆变器为牵引电机提供三相变频、变压的交流电。
It USES PLC to process the logic control and USES VVVF to adjust the water pressure.
它采用PLC进行逻辑控制，采用变频器进行压力调节。
The author introduces the running status of low pressure pump apparatuses and VVVF features.
介绍了动力厂低压泵类设备运行现状，变频调速装置的特点。
The rotation speed of turntable is adjusted by VVVF facility through a knob in electric panel.
工作转台速度的调节，是通过变频调速装置，在电气操作柜上，用旋钮进行平稳的调整。
Process control requirements of the position or speed low voltage motors using VVVF, the brake.
工艺流程要求调速或定位控制的低压电机采用变频调速，制动。
The type of quiescent VVVF inverter and design characteristic of inverter-fed motor is introduced.
简要介绍了静止式变压变频器的主要类型和以及之相应的变频电机设计特点。
This paper introduced the actual application of VVVF inverter in the improvement of elevator system.
本文介绍了VVVF变频器在高层电梯系统改造中的实际应用。
The energy-saving principle of VVVF controlled hydraulic elevators with pressure accumulators is introduced.
介绍了配置蓄能器的变频驱动液压电梯控制系统的节能原理。
The paper proposes a scheme of using three phase inverter bridge to realize VVVF of single phase capacitor motor.
提出用三相逆变桥电路实现单相电容电机变频调速的方案。
The fuzzy controllers were used to replace PID torque adjustor and PID flux adjustor of VVVF vector control system.
用模糊控制器代替VVVF矢量控制系统的PID转矩调节器和PID磁链调节器。
In this paper, MODBUS bus in VVVF control system applied constant pressure in the water supply system was discussed.
本文对MODBUS总线在变频调速控制系统在应用于恒压供水系统进行了探讨。
The variable voltage variable frequency(VVVF) control of 3-phase induction motor for driving trolleybuses is expounded.
介绍无轨电车采用变压变频控制的三相感应电动机驱动技术。
This Paper introduces the usage of a automatization system, which uses one VVVF controls many electric submersible pumps.
本文介绍了一种使用一台变频器带动多台电潜泵的自动化系统。
This paper analyzed the reason of trip for over current and overload in VVVF. And introduced how to determine on these fault.
本文对变频器的过电流跳闸和过载跳闸的故障原因进行了分析，并介绍了如何判断的具体方法。
The authors introduce a voltage-source GTO inverter VVVF system with flux linkage locus controlled by single-ship microcomputer.
介绍一种运用单片微机进行磁通轨迹控制的电压型GTO逆变器变频调速系统。
This paper gave a new design for water feeding system, the system was based on VVVF motor driver. PLC and PID closed loop control.
本文介绍一种最新的供水系统设计，以变频调速技术、可编程控制器技术及PID调节器技术为基础，构成以压力为控制对象的闭环控制系统。
The energy-saving effect and rough calculation of AC VVVF inverter in ventilator load in practical industrical production were described.
论述了交流变频调速器在工业企业实际生产中用于通风机类负载时节能效果情况及节能费用图示估算方法。
The methods discussed cover all speed control schemes, including VVVF, direct or indirect vector control, direct torque control and soft start.
所收录的方法涵盖异步电机调速的各种方式，包括VVVF、直接或间接矢量控制、直接转矩控制，甚至软启动。
A constant pressure water supply system was introduced to which used PLC to process the logic control and employed VVVF to adjust water pressure.
介绍了恒压供水系统，采用PLC进行逻辑控制，采用变频器进行压力调节。
But at the same time we should note that the impact of VVVF energy-saving effect of a number of factors, if blindly selected, is likely to backfire.
但同时应该引起注意的是，影响变频调速节能效果的因素很多，如果盲目选用，很可能事与愿违。
First, this paper presents a brief introduce to the VVVF system's principle of work, theoretically analyzed the VVVF system's mechanical characteristics.
文中首先对变频调速系统的工作原理做了简单的介绍，从理论上分析了变频调速系统的机械特性。
A method for realizing pulse coding positioning in VVVF elevator is introduced in this paper, which makes use of the internal functions of PLC and inverter.
介绍在变频电梯中利用变频器和可编程控制器的内部功能来实现脉冲编码定位的一种方法。
Customer can choose VVVF control to control running speed, the energy saving performance is obvious. It can prolong product life and reduce the operation cost.
可选用变频驱动控制，根据客人流量自动控制运行速度，节能效果显著，提高设备的运行寿命，降低运行成本。
The protection circuit is playing the decisive role in the reliability of VVVF system, lengthening the life of the installment and avoiding the power tube broken.
保护电路对于VVVF系统的可靠性、延长装置的寿命及避免功率管损坏都起到决定性作用。
The application of VVVF technique in Centralized air conditioning system is introduced. Its energy saving effect and economical effect is introduced by calculation.
介绍了变频调速技术在中央空调系统改造中的应用，通过计算说明其节能效果和经济效益。
The application of VVVF technique in Centralized air conditioning system is introduced. Its energy saving effect and economical effect is introduced by calculation.
介绍了变频调速技术在中央空调系统改造中的应用，通过计算说明其节能效果和经济效益。
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