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The reasons why reverse current protection is not necessary in rectifiers of direct current traction substation are described.

通过分析，阐述了直流牵引变电所内的整流器不必设置逆流保护的理由。

If the background current is the opposite polarity, these unwanted currents could cause a reverse polarity current reading.

如果背景电流是反极性的，那么这种不希望有的电流可能会引起反极性的电流读数。

Based on the present conditions in this field all over the world, this dissertation detailedly analysed the working process of the reversible direct current PWM controlled by double poles bridge, and illustrated the merits and shortcomings of the direct current PWM system.

本文针对国内外在这一领域的研究现状，详细分析了双极式控制的桥式可逆直流脉宽调速系统的工作过程，以及直流PWM系统的原理和优缺点。

For the case of the joint actions of the right-angled waves and current,the current has large effect on the motions of the tunnel element.

对于正向波流联合作用的情形，水流对管段的运动有很大的影响。

In the currently do not have to RIP imagesetter output software and be subject to any adjustment of the output film's site density value test results we can achieve business card printing and membership card making demands, which means the current RIP software and a parameter of the setter is in line with the current business card printing and membership card production requirements, are not required to be made of the relevant parameters are tuned, you can direct the output of a film that you want to test the value dot, and in the RIP software to convert "" gray-scale parameter is set to ensure that design business card printing and membership card production suites in a color swatch dot value and imagesetters actual output of the dot matches a color swatch.

在长远不有有差RIP输入软件和激光照排机举动任何调动的环境下，如果差所输入胶片的实地密度值尝试甘休能不亏到达制卡和会员卡制息的给求时，这表明长远的RIP软件与照排机的参数是相符长远制卡和会员卡制息给求的，不离不需给再差一些不关的参数举动调动了，可以间接差所输入的胶片举动网点百分比值的尝试，并在RIP软件洋举动"灰度变换"参数的撤销，以包管在安排制卡和会员卡制息版面时的各色块网点百分比值与照排机本质输入时的各色块网点百分比值分歧。

In the currently do not have to RIP imagesetter output software and be subject to any adjustment of the output film's site density value test results we can achieve business card printing requirements, which means the current imagesetter RIP software and is in line with the parameters of the current business card printing requirements, are not required to be made of the relevant parameters are tuned, you can direct the output of a film that you want to test the value dot, and in the RIP software to convert "" gray-scale parameter is set to ensure that design business card printing suites in a color swatch dot value and imagesetters actual output of the dot matches a color swatch.

在长远不有有不差RIP输入软件和激光照排机举动任何调动的环境下，如果不差所输入胶片的实不天密度值尝试甘休能不亏到达制卡的给求时，这外明长远的RIP软件与照排机的参数是相符长远制卡给求的，不离不需给再不差一些不关的参数举动调动了，可以间接不差所输入的胶片举动网不面百分比值的尝试，并在RIP软件洋举动"灰度变换"参数的撤销，以包管在安排制卡版面时的各色块网不面百分比值与照排机本质输入时的各色块网不面百分比值分歧。

In order to resolve the problem of large switching loss at rated current, a constant current ripple control method is proposed along with varied frequency control.

同时，针对额定电流输出时开关损耗应力较大的问题，提出了电感电流恒脉动的变频控制方法。

An optional feature allows for current limitation at start up to protect surrounding equipment, which can come in handy for things such as improving the life of a battery pack in a medical respirator, while the internal current ripple control minimizes increases in motor heat.

一项在启动后限制电流以保护周边设备可选功能是很有用途的，例如用内部电流脉冲将电动机散发的热量控制在最小以增加医疗呼吸机的寿命。

Using SPWM control with MCU designed subdivision drive mode of current vector even rotating with uniform amplitude, which can realize multi-kinds subdivision series control by setting software data. The current feedback was also adopted to compensate the error and the precise control to hybrid motor was implemented.

设计利用单片机的SPWM控制的电流矢量恒幅均匀旋转的细分驱动模式，并通过软件实现多种细分驱动控制，在此基础上为修正误差引入电流反馈环节，实现了对混合式步进电动机的精确运行控制。

Initiation of DSP, parameter setting, over voltage and over current protection are finished in the major program; current sample, rotating speed calculating, vector conversion and PWM output are finished in the interruption serving program.

系统软件由控制主程序和PWM中断服务子程序组成：主程序完成DSP的初始化、参数设定、过压、过流保护等功能；PWM中断服务子程序完成电流采样，转速计算，矢量变换和PWM输出等功能。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。