只有电动机变得先进时，真空吸尘器才会普遍使用。
It was only when electric motors became advanced that vacuum cleaners became common.
波音公司试飞了一架利用燃料电池做动力来驱动电动机的迪莫诺动力滑翔机。
Boeing has flown a Dimona motor glider with an electric motor powered by a fuel cell.
2006年，他转向了动力滑翔机，同时把小型内燃机拆了下来，用电池和电动机来替代。
In 2006 he converted a powered hang-glider, removing its small combustion engine and replacing it with a battery and an electric motor.
单相电动机运转时，产生与运转方向逆方向的转矩，因此不可能在短时间内改变方向。
The single-phase motor has a reverse direction with the totating's when operated.
还介绍了电动机的线性化范围和测试标准。
The range of linearisation and testing standard of the motor is also presented.
网上有很多地方都卖直流电动机。
炮塔的电动机嗡嗡叫。
过去，异步感应电动机的主要缺陷是难于变速。
In the past, the main disadvantage of asynchronous induction motors was the difficulty of varying their speed.
也可以考虑购买伺服电动机。
但是也可以通过在前轮上安装电动机来实现四轮驱动。
But motors could be fitted to the front wheels as well to provide four-wheel drive.
但在某些应用方面，它似乎可以与老式的电动机匹敌。
But in some applications, it seems, they could give the venerable electric motor a run for its money.
目前这款车采用了两台电动机，分别用来驱动两个后轮。
At present two electric motors are used, one powering each of the rear wheels.
电动机不需要齿轮变速箱，因此可以减轻重量和机械复杂性。
Electric motors do not need a gearbox, which reduces weight and mechanical complexity.
采用人造肌肉代替电动机可减小太空探测器和机器人的体积与重量。
Using artificial muscles in place of motors could reduce the size and weight of space probes and robots.
波音公司也试飞了利用燃料电池做动力来驱动电动机的动力滑翔机。
Boeing has also flown a Dimona motor glider with an electric motor powered by a fuel cell.
作为一个初学者你肯定不会希望你的电动机影响或烧毁你敏感的电路。
As a beginner you do not want your motors interfering with or even melting your sensitive circuitry.
这样的设备被称为异步电动机，因为转子的磁场总是滞后于定子的磁场。
Such machines are known as asynchronous motors, because the rotor's magnetic field never catches up with the stator's field.
下一次，机器人会选择一种表情，且其选择倾向于使电动机在正确的设置上。
Next time the robot picks an expression, there's a bias towards putting the motors in the right configuration.
材料科学：电活性聚合物，又称人造肌肉，可在某些应用环境下替代电动机。
Materials science: Electroactive polymers, also known as artificial muscles, could replace electric motors in some applications.
和汽车制造商一样，他们正试图将内燃机引擎和电动机结合起来以便节省燃油。
Like carmakers, they are trying to combine internal-combustion engines and electric motors to save fuel.
沸水反应堆紧急制冷系统的水泵和电动机和紧凑的两厢车竖起来的大小差不多。
The emergency cooling system pump and motor for a boiling-water reactor are roughly the size and height of a compact hatchback car standing on its back bumper.
而且，如同电动机一样，人造肌肉还能反过来当发电机使用，将运动转化为电力。
And, just like motors, artificial muscles can also be used in reverse as generators, transforming movement into electricity.
另外传统的每辆劳斯莱斯都以舒适，敏捷和安静和著称，电动机在这方面更胜一筹。
And as every Roller is famously smooth, swift and silent, electric motors can hardly excel in that department either.
燃料电池引擎被莲花工程组装完成，同时也包含了控制优化系统和电动机。
The fuel cell engine was packaged into the cab by Lotus Engineering, which also designed control systems to optimise performance of the fuel cells and electric drive systems.
在许多情况下，在工业设备中使用由电池电力驱动的电动机比使用柴油发动机效率更高。
In many cases, using electric motors powered by batteries will be more efficient than running diesel engines in industrial equipment.
所以2006年，他转向了动力滑翔机，同时把小型内燃机拆了下来，用电池和电动机来替代。
So in 2006 he converted a powered hang-glider, removing its small combustion engine and replacing it with a battery and an electric motor.
飞行器以发泡聚丙烯为主体，在其背部与两个升降舵补助翼（可以操控的界面）上有一个电动机。
The flying robots were built out of expanded polypropylene with a single motor at the rear and two elevons (control surfaces that enable steering).
利用13.8米长的翼展和一个42千瓦的电动机，E430可以在空中持续飞行3个小时之久。
With a 13.8-metre wingspan and a 42kw electric motor, the E430 has a flying time of up to three hours.
利用13.8米长的翼展和一个42千瓦的电动机，E430可以在空中持续飞行3个小时之久。
With a 13.8-metre wingspan and a 42kw electric motor, the E430 has a flying time of up to three hours.
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