提出了一种用于电动汽车的高频交流脉冲密度驱动系统并阐述了系统的工作原理和控制方法。
A novel drive system with high frequency AC pulse density modulation for electric vehicles is proposed, and its operation principle and control method are studied in detail.
系统采用间接矢量控制技术，通过高频交流脉冲密度调制接口变换器，对功率进行协调控制。
The suggested system makes use of a single phase HFAC pulse density modulation(PDM) converter as the interface to connect energy storage unit and power source for induction motor drive system.
该文介绍了一种采用脉冲密度调制(PDM)控制策略的串联谐振型塑料薄膜表面处理电源的研制。
This paper presents a pulse density modulated (PDM) series resonant inverter developed for plastic film surface treater. The use of the PDM inverter enables the constant frequency and voltage.
该设计集成了脉冲宽度调制（PWM）和脉冲密度调制（PDM）两种调制方式，并可以在两者间切换。
This controller integrates pulse width modulation(PWM) and pulse density modulation(PDM) together, and can easily change between the two modulations.
提出了一种新颖的高频交流脉冲密度调制变频器的拓扑结构，并详细阐述了工作原理、控制方案和设计方法。
A novel topologic structure of high frequency AC pulse density modulation converter is proposed, and its operation principle, control scheme and design are described in detail.
一束激光脉冲可以改变电子的状态，使得其有了图中绿色显示的密度分布。
A laser pulse can modify the electron s state so that it has the density distribution shown in green.
一束激光脉冲可以改变电子的状态，使得其有了图中绿色显示的密度分布。
A laser pulse can modify the electron's state so that it has the density distribution shown in green.
这颗快速旋转的恒星是脉冲星，也就是大质量恒星爆炸后经内部坍缩形成的超高密度星体。
The fast-spinning star is a pulsar, a superdense chunk of matter left over when a massive star explodes, then collapses in on itself.
图片靠近中心部分的白色光源为一种密度大，急速旋转的中子星，或是脉冲星--都是核心坍缩的超新星爆炸的残留物。
The white source near the center of the image is a dense, rapidly rotating neutron star, or pulsar, all that remains of a core-collapse supernova explosion.
脉冲星并不是一种正常的恒星，它是超新星爆炸后留下的高密度快速旋转的残余部分。
A pulsar is not a normal star, but a dense, rapidly spinning remnant of a supernova explosion.
这颗脉冲星生来奇特，它是一颗旋转速度约10000rpm的星体的超高密度残骸。
The pulsar is exotic on its own—it's a super-dense remnant of a star spinning at about 10, 000 rpm.
讨论了脉冲激光微型焊接中，对于激光的脉冲形状、光脉冲宽度、光通量密度等的选择，并给出了实验结果。
Selection of laser pulse shape pulse duration flux density are discussed in pulsed laser microwelding and the experimental results are given.
结果表明，脉冲co 2激光功率密度经三次反射激光聚焦系统达到空气击穿阈值，实验中观察到等离子体发光现象。
The results show: pulse power density from CO2 laser reaches air breakdown threshold through thrice reflecting focus system, and plasma radiation phenomena is observed in the experiment.
进一步延长或缩短脉冲电流烧结时间，烧结体的密度、硬度和弯曲强度反而下降。
With prolonged or shortened pulse electrical current sintering time, the density, hardness and bend toughness of the sintered materials decreased.
针对先进纳米铜互连技术的要求，研究了脉冲电流密度对铜互连线电阻率、晶粒尺寸和表面粗糙度等性能的影响。
Aiming at the technology demand of advanced copper interconnection, the effect of pulse current density on cu layer properties such as resistance, crystal size and surface roughness were investigated.
着重强调了激光能量密度、脉冲宽度、作用时间等工艺参数与结深、杂质分布以及结电阻之间的密切关联。
The close correlations between laser energy density, pulse duration, interaction time and junction depth, dopant distribution as well as junction resistance are mainly emphasized in this paper.
考察了脉冲峰值电流密度对纳米晶镍镀层织构和硬度的影响。
The effects of pulse peak current density on the texture and hardness of electrodeposited Ni were investigated.
用高能量密度脉冲等离子体于室温下在氮化硅陶瓷刀具上成功沉积了高硬耐磨的氮化钛涂层。
Hard and wear-resistant titanium nitride coatings were deposited by pulsed high energy density plasma technique on silicon nitride ceramic cutting tools at ambient temperature.
脉冲高能量密度等离子体是一项全新的等离子体材料表面处理和薄膜制备技术。
The use of pulsed high energy density plasma is a new low temperature plasma technology for material surface treatment and thin film deposition.
脉冲功率密度直接影响烧蚀凹坑深度。
Pulse power density directly influences ablation crater depth.
对SBS产生过程做了理论研究，分析了介质声子寿命、泵浦脉冲形状和功率密度等因素对SBS的影响。
Process of SBS' generating whose effecting factors include the photo-life in the medium, the shape of pump pulse and the power density was theoretically studied.
送气系统提供的稳态和脉冲送气方式成功地运用于各种物理实验和密度控制。
Steady and pulsed gas injection modes are provided by this system and work well for density control.
本文从第一性原理出发，计算了充磁线圈产生的磁场，脉冲充磁的超导圆盘中的感应电流密度和俘获场分布。
The distribution of the induced current density and the profile of the trapped magnetic field in a superconducting disk magnetized by magnetic pulses are calculated from first principles.
疲劳试验结果表明：约束层冲击阻抗越大，激光脉冲功率密度越高，铝合金激光冲击处理后疲劳寿命的提高越显著。
The fatigue test results show that the higher shock impedance of overlays, and the higher laser power density, the greater the increase of fatigue life of aluminum alloy.
由于超短脉冲具有较宽的光谱范围及较高功率密度，倍频转换效率和谐波脉冲波形将受到许多因素的影响。
Conversion efficiency and pulse wave-forms will be affected by many factors due to the wide spectrum range and high intensity density of ultra-short pulses.
能量密度达到造成液态质量迁移条件的长脉冲激光，可获得较大的烧蚀率和截面积较大的通孔。
A long-pulse laser, whose energy density can cause the liquid mass transferred, can get a greater ablation ratio and a hole with larger cross section.
它是用单束激光脉冲在样品内激发出一个压力脉冲，该压力脉冲将导致两电极上感应电荷层密度变化。
It is used to excite pressure pulse in a sample by means of a single laser pulse which will lead to the change of charge density on the two electrodes.
在脉冲激光束和脉冲离子束辐照条件下，针对不同脉冲作用时间和能量密度建立传热模型。
The heat conduction equations were developed for the pulsed laser beams and pulsed ion beams with the various pulse duration and energy density.
用一维粒子模拟程序研究了超短脉冲强激光与超临界密度等离子体平板作用产生的高次谐波。
Using the one-dimensional particle-in-cell simulation code, we have studied the generation and redshift of harmonics from overcritical plasma layer irradiated by ultrashort intense laser pulses.
用一维粒子模拟程序研究了超短脉冲强激光与超临界密度等离子体平板作用产生的高次谐波。
Using the one-dimensional particle-in-cell simulation code, we have studied the generation and redshift of harmonics from overcritical plasma layer irradiated by ultrashort intense laser pulses.
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