UC知道高分求英译汉此篇文章
来源：百度知道 编辑：UC知道 时间：2024/05/23 09:41:27
这是一本国外电机学教材上节选的文章。要翻译了交给老师。麻烦达人帮忙翻译下。要求不高，只要不是机器翻译的。能看的顺畅就行。小弟分不多，只有一百多分。
14.19 Variable-speed drives
We have already seen that for a given load, an in-
crease in rotor resistance will cause the speed of an
induction motor to fall. Thus, by varying the exter-
nal resistors of a wound-rotor motor we can obtain
any speed we want, so long as it is below synchro-
nous speed. The problem is that the power dissipated
as heat in the resistors makes for a very inefficient
system, which becomes too costly when the motors
have ratings of several thousand horsepower. We get
around this problem by connecting the slip-rings to
an electronic converter. The converter changes the
power at low rotor frequency into power at line fre-
quency and feeds this power back into the 3-phase
system (Fig.14.17). As a result,such a variable-
speed control system is very efficient,in the sense
that little power is lo
14.19 Variable-speed drives
We have already seen that for a given load, an in-
crease in rotor resistance will cause the speed of an
induction motor to fall. Thus, by varying the exter-
nal resistors of a wound-rotor motor we can obtain
any speed we want, so long as it is below synchro-
nous speed. The problem is that the power dissipated
as heat in the resistors makes for a very inefficient
system, which becomes too costly when the motors
have ratings of several thousand horsepower. We get
around this problem by connecting the slip-rings to
an electronic converter. The converter changes the
power at low rotor frequency into power at line fre-
quency and feeds this power back into the 3-phase
system (Fig.14.17). As a result,such a variable-
speed control system is very efficient,in the sense
that little power is lo
14.19变速驱使我们已经看到某个负荷 在谈到皱痕转子电阻会使感应马达速度下降. 因此,不同的对外向-莱利一电阻绕线电机我们可以获得我们想要的任何速度, 只要是低于同步速度臭氧. 问题是,在电力消退热电阻起来很低效制度 而变得太昂贵,当汽车评级几千马力. 围绕这一问题,我们得到的连接不慎戒指电子器. 转炉转子低功率频率变化的权力变成邻线-淬火、饲料这回力 到三相系统(fig.14.17). 由于这种变速控制系统是非常有效率,因为在小功率损失 形式的热量. 14.20变频器常规绕线电机可作为变频器产生频率位元 从当年的事业公司. 定子的绕线机连接的公用线 而转子速度在适当的驱动马达米(fig.14.18). 电力供应转子的三相负荷时电压E2和频率的F2、 两者都取决于滑动. 因此,协议易为eqs.13.3和13.4, 我们的F2=丝素E2=(13.3)(13.4)seoc一般预期的频率是两三倍,公用事业公司. 据情商. 13.3,为了达到这个频率哥必须大于改善学生积极结果 要针对旋转轴的方向revolv莺通量. 变频器的运作是那么相同,感应电动机手术电机作为刹车. 但是,电力PJR-D,通常在转子热消退,现已向负载供电. 转炉作为发电机、 有源和流动所示fig.14.19.note这是何其相似的潮流时 异步电机作为刹车挤提(fig.14.16).