大型电动机应当使用三相交流电。
分析了三相交流电机全数字脉宽调制的原理。
The principle of pure digital PWM of the three-phase AC motor is analyzed.
为大功率三相交流电机的无触点控制提供一种方法。
It provides a method for the untouched switch Control for three - phase alternating current motor.
本实用新型名称为三相交流电动机液态软起动调速装置。
The utility model relates to a liquid soft starting and speed governor of AC motor, belonging to the dragging and controlling filed of motor.
改进型不配整流变压器，将三相交流电源直接由桥式整流获得直流电压。
The modified types will not be equipped with commutation transformer and the three-phase alternating current power supply directly acquires DC voltage through bridge type rectifier.
该芯片具有六个驱动通道，能够驱动直流电机、步进电机和三相交流电机。
The chip has six channels, it can driver Actuator motor, sled motor and 3 phases motor driver.
三相交流电弧炉电极升降控制系统是一个复杂的非线性多变量耦合控制系统。
3-phase ac arc furnace electrode up-down control system is a complex multiple variable coupling control system.
文章所介绍的测量方法适用于采用Y形接法的各种电机三相交流电参数测试。
The method presented in this paper is suitable for measurements of AC parameters of all motors that in Y mode connections.
三相交流电压检测，过压、欠压、缺相、停电告警，全自动双路交流前换功能；
Voltage detect of three phase AC, the warning of over-voltage, under-voltage, lost phase and power failure, two-way AC circuits switch full-automatically.
介绍了一个主要由峰值检波器和脉冲宽度鉴别器构成的三相交流电源缺相保护电路。
This paper introduces a kind of electric circuit which mainly consists of a peak detector and a pulse-width discriminator for protecting the three-phase alternating-current supply with loses a phase.
本系列发电机适用于乡村、城镇、工地、山区及牧区等照明及动力的三相交流电源。
The generators are to be user in town, the countryside, workersites, mountain districts and pasture lands as a electric power source for lighting purpose.
介绍了一种用于制盐业三相交流电机的电流、电压和温度的智能保护系统的设计与实现。
This paper introduces the design and practice of intelligence protection system for the current, voltage and temperature of three-phrase ac motors.
通过对三相交流电压的测试试验，验证了该系统的可靠性，可为国产电源系统的设计定型提供依据。
The test on three phase alternating voltage has shown that this system has good reliable performances and can afford evidence for finalizing the design of power supply system made in our country.
本文阐述了对三相交流电动机故障的一种检测方法，并介绍了该检测方法的实验分析及现场应用情况。
This paper states a detecting method for defect of three-phase current motor and it also introduces the experimental analysis result and practice utilization condition of this detecting method.
经实验和实际应用证明，TMS320F 240功能很强，运算速度很快，适用于三相交流电机的控制。
Through experiments and practical operation, it is proved that TMS320F240 is powerful and features high speed operation, it is suitable for controlling 3 phase ac motors.
设计开发一种工业用三相交流电参数仪，能够测得三相交流电各相的电压、电流、功率、功率因子等参数；
A three-phase alternating current parameters instrument to be used in industry is designed. It can measure the voltages, currents, power factors of each phase of three-phase alternating current.
利用电力系统三相交流电压过零点和高速数字频率合成器解决了跳频系统中同步和快速频率合成的两个关键问题。
The zero-crossings of the AC voltage and digital frequency synthesizer are used in solving the two main problems in frequency hopping system-synchronization and fast frequency synthesizing.
电力变换器主电路部（3），其根据该脉冲宽度调制波对开关元件进行驱动，将直流电压转换为三相交流电压；
A power converter circuit (3) drives a switching device by the pulse-width modulated wave for converting a direct current into the three phase alternating current.
最后，在该实验平台上实现了三相交流电动机SVPWM算法的开环控制实验，实验结果表明系统达到了设计要求。
Finally, relative experiments of 3-phase ac motor SVPWM open-loop control are achieved using this experiment platform, the testing result of system comes to the request designed.
该晶闸管触发器采用集成运数放大器，移相触发脉冲的形成是根据三相交流电的各相与移相控制电压直接比较原理实现的。
The shift trigger pulse of the thyristor trigger circuit with integration amplifier is generated by comparing directly principle of three-phase AC and shift-phase control voltage.
介绍一种按照实际交流电弧的特性设计的三相交流电弧炉仿真试验系统，针对电弧炉电极升降控制提出了一种基于DSP的控制方案。
This paper introduces a simulation experimental system of 3-phase ac arc furnace, developing a DSP based electric-arc furnace electric pole fluctuation control system.
基于上述三相交流电弧炉电路模型，分析了电流不对称和阻抗不对称对电弧功率的影响，并讨论了交流电弧炉三相电参数互相影响的复杂性。
The influences of the asymmetry of current and impedance on the arc voltage and power were analyzed, and the investigation complexity was also discussed.
它由三相或单相交流电压经降压和全波整流(或桥式整流)得到，无稳压及平波要求功率要足够大。
It consists of three-phase or single-phase AC voltage by the step-down and full-wave rectifier (or rectifier bridge) has been, no regulator and ping-wave large enough to require power.
它由三相或单相交流电压经降压和全波整流(或桥式整流)得到，无稳压及平波要求功率要足够大。
It consists of three-phase or single-phase AC voltage by the step-down and full-wave rectifier (or rectifier bridge) has been, no regulator and ping-wave large enough to require power.
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