历史是人们所创造的，但人们并非有意识、有目的地去创造历史，即他们的历史活动是一种无动机的行为。
History is created by people, but people do not create history consciously and purposely, which means that their historical activity is a sort of unmotivated behavior.
“如果阅读他们解释自己动机的宣言的话，你会发现其中杂乱无章”，她表示。
"If you read their proclamations explaining their motives, they're all over the place," she says.
每一个人的动机结合是独一无二的和复杂的。
What motivates people. Everyone's mix of motives is unique and complex.
铼可以用来制造喷气式发动机的耐高温合金部件，也是高能量的无铅汽油的成分。
Rhenium is used to make high-temperature alloys for jet engine parts and in high-octane, lead-free gasoline.
2009年，通用电气和NASA（美国航空航天总署）合作，重新开始19世纪80年代搁置的一项工作，继续一种颠覆传统的无涵道风扇发动机实验。
In 2009 GE, working with NASA, America’s space agency, picked up work it had largely set aside in the 1980s on a radically different sort of engine called an unducted fan.
这个全球最大的汽车生产商正在为拓展混合动力型汽车的市场份额而开发无钕电动发动机。
steer clear - To stay away from; avoid. The world’s largest carmaker is developing a neodymium-free electric motor for its expanding range of hybrid cars.
介绍一种无速度传感器异步电动机拖动系统的再起动方法。
This paper proposes a restart method for an asynchronous motor drive system without speed sensor.
无负载转速是电动机设计过程中的一个重要参数。
No - load speed is one of important parameters in ultrasonic motors design.
这款车型拥有水晶激光的前大灯和尾灯以及“蜻蜓”式向上打开的双扉门。该车还拥有磁性无轮毂电动机和一个无线自动操作系统。 。
It has crystal laser headlights and taillights and 'dragonfly' dual swing doors that open upwards. The car also has magnetic hubless electric wheel motors and a wireless autocharging system.
设计了以TMS320 LF 2407作为中央处理器的无刷直流电动机控制器，并将该控制器应用于混合动力汽车的驱动系统中。
A design of hybrid electric vehicle (HEV) brushless DC motor controller based on TMS320LF2407 with energy regeneration, which is used in the drive system of the HEV.
无换向器电动机是一种新型的可调速电机，其调速性能优于直流调速系统。
No commutator motor is a new variable-speed motor, its adjustable-speed performance is more advantage than dc system.
无刷直流电动机在高性能驱动应用中具有良好的调整性能、高电压、高转矩、高体积比以及无电刷的优点。
Brushless direct current motors and have advantages of good adjustment performance, high voltage, high torque, high volumes ratio in high performance drive.
实验结果表明：在网络控制系统中无刷直流电动机转速响应快速，运行平稳，证明了这种新型控制系统的有效性和可行性。
The experimental result shows BLDCM response rapidly and run stableness in networked control system and proves the validity and feasibility of this control system.
但由于无尾桨系统要耗费更多的发动机功率，性能表现不好。
But the performance is poor because requires more power from the engine.
因此，对无刷直流电动机的应用，必须考虑其转矩脉动的抑制问题。
So the compensation of pulsating torque is very importance for the application of PMSMs.
本文是对无刷直流电动机做出深入的剖析与设计。
This paper intends to make a better on the Design of Brushless DC motor.
针对新型五自由度无轴承异步电动机这一多变量、非线性、强耦合的系统，采用逆系统的方法进行解耦控制。
A decoupling control approach based on inverse system has been used for the innovative five degree-of-freedom bearing less induction motor, which is multi-variable, nonlinear and high coupling.
最终的结果是提高燃料的效率高达70-80％，以及发动机和烟雾清洁无废气。
The end result is an increased fuel efficiency of up to 70-80% as well as a cleaner engine and smog-free exhaust.
根据无刷直流电动机的特点和DSP芯片的功能，提出了基于DSP的控制方案。
According to the characteristic of BLDCM and the function of the chip, sensor control solutions which are based on DSP technology are presented.
阐述一种用于全电飞机机电作动系统的双绕组永磁无刷直流电动机。
A permanent magnet brushless DC motor was presented, which will be used for a Electro-Mechanical Actuator (EMA) in a All-Electric Aircraft(AEA).
文章重点阐述利用无刷直流电动机构建的井下压力闭环实验装置和以无刷直流电动机为控制核心的软件平台。
The paper places emphasis on the closed-loop system of pressure based on BLDC motor and the correlative software.
进行了直流无刷电动机控制系统的软、硬件调试，同时对调试过程中碰到的题目进行分析和阐述，并提出解决方法。
Carry out the debugging of a brushless DC motor control system hardware and software, meanwhile analyse and explain problems they encounter, at last putting up with solutions.
无运动机构的磨擦磨损，机械效率高，这是涡旋式压缩机比其它空气压缩机大大节能的主要原因。
No movement mechanism friction wear, the mechanical efficiency high, this is type compressor vortex than other air compressor greatly energy saving main reason.
永动机只能是一种无摩擦力的机器。
探讨了目前电梯门机系统存在的问题，提出了应用DSP数字信号处理技术为核心，无刷直流电机为驱动机的系统方案。
Discusses the problems existing in the door motor of elevator, puts forward the system project which takes DSP digital signal processing technology as core, DC brushless motor as driver.
探讨了目前电梯门机系统存在的问题，提出了应用DSP数字信号处理技术为核心，无刷直流电机为驱动机的系统方案。
Discusses the problems existing in the door motor of elevator, puts forward the system project which takes DSP digital signal processing technology as core, DC brushless motor as driver.
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