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The invention aims to solve problems in the prior compensation pulse generator, such as complicated electrical excitation structure and unadjustable permanent magnet excitation output.

目的是解决偿脉冲发结构复杂、输出不能调节问题。

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经济学人(汇总)

Dr Vetrovec intends to perform his version of the trick at atmospheric pressure, and using permanent magnets.

维特威克博士想要在大气压力下使用来实现他的把戏。

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可汗学院Khan Academy Middle school physics - NGSS初中物理

This makes electromagnets quite different from permanent magnets.

使得有很大不同。

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可汗学院Khan Academy Middle school physics - NGSS初中物理

This is different from a permanent magnet because permanent magnets don't need this wire.

不同,因为不需要线。

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可汗学院Khan Academy Middle school physics - NGSS初中物理

So let's take a look at that and compare permanent magnets to electromagnets.

让我们看一下并将进行比较。

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可汗学院Khan Academy Middle school physics - NGSS初中物理

Permanent magnets also have fixed poles.

也有固定极。

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可汗学院Khan Academy Middle school physics - NGSS初中物理

On the other hand, permanent magnets are always on.

另一方面,始终处于开启状态。

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可汗学院Khan Academy Middle school physics - NGSS初中物理

Permanent magnets have a fixed strength, but we just talked about how we can change the strength of electromagnets, so electromagnets have adjustable strength.

的强度是固定的,但是我们刚才讲了如何改变铁的强度,所以铁的强度是可调的。

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可汗学院Khan Academy Middle school physics - NGSS初中物理

Permanent magnets do not need a power source, but this means that we can also turn electromagnets on and off, which is pretty cool when you think about it.

不需要源,但意味着我们也可以打开和关闭,想想看,真是太酷了。

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