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   电流脉动 的翻译结果: 查询用时:1.464秒
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电流脉动     
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  current ripple
     In order to decrease the current ripple and improve the operating performances of the rare earth permanent magnetic brushless DC motor system,a two quadrant current chopper is used in the system and its operating principles are analyzed in this paper. The results of digital simulation and system experiment are presented and confirm that the system based on the two quadrant current chopper has attractive performances.
     采用在逆变器输入端加电流型两象限斩波器进行调压的方法,解决了稀土永磁无刷直流电动机因电枢电感小而带来的电流脉动大、不利于提高系统稳态性能等问题,并对这种调速系统的四象限工作原理进行了系统的分析,最后通过数字仿真和系统实验验证了采用电流型两象限斩波器能明显减小电流脉动,而且系统具有良好的起制动特性
短句来源
     Interleaved two transistor forward converter had the advantages of low voltage stress of switches and high reliability,also,it can increase the converter′s effective frequency and decrease the output current ripple.
     双管正激变换器的开关电压应力低,且具有内在抗桥臂直通的能力,可靠性高,因而得到了广泛应用。 交错并联双管正激组合变换器既保留了单个双管正激变换器的上述优点,又能提高变换器的等效频率,减小输出电流脉动,增加变换器容量,因而已成为研究热点。
短句来源
     The performance of the two control schemes is evaluated in terms of torque and current ripple, and transient response to step variations ofthe torque command.
     从转矩和电流脉动、跟踪转矩命令阶跃变化的转矩瞬态响应等方面评估了两种控制方案的性能。
短句来源
     In the paper the current ripple is analyzed when the motor runs at low-speed state, a power circuit and the control method are presented and the system structure is discussed.
     分析了低速运行时的电流脉动 ,提出了适用的功率电路与控制方法 ,并且讨论了系统结构。
短句来源
     By analyzing the current ripple of the filter inductor on the condition that the phase shift is different,the reduced value of the current ripple with the interleaving modulation strategy can be got.
     通过分析变换器在不同开关相角下滤波电感电流脉动的大小 ,得出了在同样的电流脉动要求下 ,采用交错开关方式与采用传统开关方式相比 ,滤波电感可减小的幅度。
短句来源
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  current ripples
     Because of brushless motor's large torque ripple during low speed and direct driving, it is the study focus of Brushless DC motor applications how to reduce torque ripples and current ripples.
     由于无刷直流电机在低速和直接驱动时的转矩脉动比较大,在研究了无刷直流电机工作和控制原理的基础上,对导致电流脉动和转矩脉动的原因进行了分析,深入研究了转矩抑制和电流控制的方法。
短句来源
     The control block of traditional Direct Self-Control based on switching table(ST-DSC) and Indirect Self-Control(ISC) in low-speed range and the mathematical formula of the Indirect Self-Control and Space Vector Modulation DSC(SVM-DSC) are presented. The torque and current ripples relative to those schemes are researched by Matlab/Simulink. How to select from them in system design is discussed.
     文章给出了异步牵引电动机在低速区基于开关表的传统直接转矩控制(ST-DSC)和间接转矩控制(ISC)的原理框图,以及间接转矩控制和基于空间矢量调制的直接转矩控制(SVM-DSC)的数学关系,并用Matlab/Simulink对三种控制方法的转矩脉动和电流脉动进行了对比仿真研究,根据仿真结果讨论了在系统设计时选择控制策略的依据。
短句来源
  ripple current
     The thesis researches the magnetic-integration applied to the active-clamp forward converter so as to reduce the ripple current and improve its performance.
     本文针对DC-DC模块电源中应用较多的有源箝位正激变换器,研究磁集成技术的应用,以减小输出电流脉动并提高变换器的整体性能。
短句来源
     According to the analysis, the novel methods to regulate the output ripple current or ripple voltage in the multi-output converters is presented in this thesis.
     结合多路输出电源,分析耦合电感对电源性能的影响,并在分析耦合电感各参数对电流脉动影响的基础上提出:通过改变耦合电感的绕制方法来调整输出电流脉动和输出电压纹波。
短句来源
     Magnetics is one of the main factors, which limit the power-density and characteristics of power module. For lowing weight and volume, reducing power loss and ripple current, improving dynamic performance, the magnetic-integration technique has been one of the research populations in power electronics.
     对于已经大量采用高频软开关技术的模块电源,限制其功率密度进一步提高、性能进一步改善的重要因素之一是磁性元件,而磁集成技术由于具有可以减小磁件体积重量,减少磁件损耗,减小输出电流脉动,改善输出动态性能等优点,成为目前电力电子技术的研究热点之一。
短句来源
  current pulsation
     with neglecting the process of commutation and DC current pulsation, the thesis analyses the power factor and harmonics for Resistance-Inductance Load single-phase bridge type,three-phase bridge type and multi-phase rectification circuits,as well as half-control bridge type circuits.
     从工程实际出发,分析了忽略换相过程和直流侧电流脉动时,阻感负载单相桥式、三相桥式可控整流电路以及多相整流电路的功率因数和谐波情况,并针对半控桥式整流电路作了谐波分析.
短句来源
     Making use of the advantage of small current pulsation of monopole PWM bridge DC convert circuit,combining the technique of microprocessor,applying to separate power supply in DC excitation system,it's convenient to implement the manipulation of non-contact-commutation,it has quick response and it can fulfil the requests of the system to excitation.
     利用单极性PWM桥式直流变换电路所具有电流脉动小的优点,结合微处理技术,应用在独立电源供电的直流励磁系统中,便于实现无触点化换向操作,且动作响应快速,更好的满足系统对励磁部分的要求。 单极性;
短句来源

 

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      current ripple
    Compared with the conventional sinusoidal PWM scheme, it is confirmed that the current ripple is decreased and the spectrum is shifted and dispersed to a higher frequency region.
          
    A numeric method has been developed to compensate this current ripple effect.
          
    A large current ripple was observed at the GenCore's fuel cell stack, as seen in Figure 43.
          
    A disadvantage of the hard chopping operation is that it increases the current ripple by a large factor in comparison with the soft chopping approach.
          
    As may be seen in table 1, the current ripple increases as the winding current decreases.
          
    更多          
      current ripples
    The circuit for controlling the switch current regulator maintains the relative value of current ripples in the lamp at a constant level.
          
    Initiation and evolution of current ripples on a flat sand bed under turbulent water flow
          
    However, while offering high dynamic performance, classical DTC produces notable torque, flux, and current ripples, and operates with a variable inverter switching frequency.
          
    Internal tidal currents are the likely cause of erosional features such as current ripples, sand waves, and truncated bedding horizons on the sediment cap of Horizon Guyot.
          
    As a result of this, the current ripples are calculated to be greater.
          
    更多          
      ripple current
    However, a ripple current occurs in the inactive phase due to the diode freewheeling during the non-commutation period in the traditional pulse width modulation (PWM) methods, which aggravates the torque ripples.
          
    Compared to traditional EMI (electromagnetic interference) filter consisting of choke and capacitor, the ripple-free topology can reduce the converter's ripple current with the use of smaller component.
          
    The peak-to-peak ripple current in the formula is determined by the measuring system.
          
    An experimental evaluation of the effects of ripple current generated by the power conditioning stage on a proton exchange membr
          
    The relationship between ripple current and fuel cell performance, such as power loss and fuel consumption, is investigated.
          
    更多          
      其他


    A new type single phase AC-DC convertor without filer capacitor has been proposed in this paper. A PWM technique, here callad equal V-S integral PWM technique, which can decrease the ripple voltage of the output voltage and the peak-ripple factor of a pulsating direct output current has been presented. compared with the single bridge converter, this technique can improve the waveform guality of the output voltage and the output current apparently. The 2th and 4th hormonics voltages are decreased 97% and 49%...

    A new type single phase AC-DC convertor without filer capacitor has been proposed in this paper. A PWM technique, here callad equal V-S integral PWM technique, which can decrease the ripple voltage of the output voltage and the peak-ripple factor of a pulsating direct output current has been presented. compared with the single bridge converter, this technique can improve the waveform guality of the output voltage and the output current apparently. The 2th and 4th hormonics voltages are decreased 97% and 49% respectively; in the same load condition, the peak-ripple factor of apulsating direct output current is decreased about 40% Finally, the experiment result is given in this paper.

    本文提出了一种无中间滤波电容的新型单相AC-DC变换器,并介绍了一种能减小输出电流脉动率和输出电压谐波的PWM调制技术,即等面积伏秒积分PWM调制技术.与桥式整流电路的比较结果表明,采用等面积伏秒积分PWM调制技术能使变换器的输出电压波形和输出电流波形得到明显改善,其中输出电压的第2、4次谐波分量可分别降低97%和49%;在同样的负载条件下,输出电流脉动率可降低40%左右.文章最后给出了实验结果.

    First,the steady-state characteristics and stability of system driven by a series diode current type inverter are analyzed by the established state equation.The cal- culating results taking into account both the ripple component of current and the commutation period are verified experimentally.Also,the improving suggestions of the stability and steady-state characteristics of system driven by the series diode current type inverter induction motor are presented.Finally,parameter selection of the induction motor...

    First,the steady-state characteristics and stability of system driven by a series diode current type inverter are analyzed by the established state equation.The cal- culating results taking into account both the ripple component of current and the commutation period are verified experimentally.Also,the improving suggestions of the stability and steady-state characteristics of system driven by the series diode current type inverter induction motor are presented.Finally,parameter selection of the induction motor driven by this system and CAD technique of this driven system are given

    本文用状态变量法分析了串联二极管电流型逆变器拖动系统的稳态特性及稳定性,分析中由于考虑了换流过程及电流的脉动使理论计算与试验结果有较好的吻合。理论分析时,将非线性系统在运行点线性化,得到系统的差分方程,然后求解差分方程的特征值,并在z平面内分析稳定性。通过分析阐明了电机参数对系统稳定性及稳态特性的影响,且建立了系统参数的cAD程序。

    A new pyroelectric phenomenon is presented. Furthermore, its principle is qualitatively desoribed. Some experimental results of current pulsation of gas disoharge and voltage variation due to pyroelectricity under room temperature condition are given.

    提出一种新的热释电现象,并对这种热释电现象的原理作定性阐述,同时给出室温条件下由这种热释电现象产生的电位变化及由此引起的气体放电电流脉动的实验结果。

     
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