UC知道请英语好的帮忙翻译一下，是关于电气专业的专业英语
来源：百度知道 编辑：UC知道 时间：2024/06/14 11:37:54
shows a squirrel cage induction motor being fed from power semiconductors, which in tum are fed from a DC source．As noted above, the AC squirrel cage motor does not generate a commutation or turn-off sine wave. Suppose that it is desired to provide the effect of adjustable freqquency to the motor. Forced commutation must then be used to turn off the devices.
If the devices are transistors, the application of a base signal will turn the transistous on. Removal of the base signal will cause commutation turn-off. No other power devices are required for this forced commutation with transistors.
With GTOs, a positive gate pulse will cause turn-on and a negative gate plus will cause commutation or turn-off. As with transistors, no other auxiliary power devices are required for forced commutation.
As noted previously with thyristors, the gate circuit has no effect on turn-off. The forcing of current zero in the anode-cathode circuit must be done by auxiliary power devices
If the devices are transistors, the application of a base signal will turn the transistous on. Removal of the base signal will cause commutation turn-off. No other power devices are required for this forced commutation with transistors.
With GTOs, a positive gate pulse will cause turn-on and a negative gate plus will cause commutation or turn-off. As with transistors, no other auxiliary power devices are required for forced commutation.
As noted previously with thyristors, the gate circuit has no effect on turn-off. The forcing of current zero in the anode-cathode circuit must be done by auxiliary power devices
如..所示为用电力半导体供电的鼠笼式异步电动机，这个电力半导体又是由直流电源供电。 如前说述，鼠笼式交流异步电动机不会产生整流的或关断的正弦波。假设需要向电动机提供变频电源，将使用强制整流来关闭装置。
如果装置是晶体管，应用基波信号将打开这些晶体管。去掉基波信号后将导致整流停止。没有其他的电力（电力电子）装置需要这样的用晶体管进行强制整流。
门极可关断晶闸管，一个正脉冲就能开启，一个下降脉冲就能开始整流或关闭。和用晶体管时一样，强制整流时不需要其他辅助电力电子设备
如前所述的晶闸管，门电路（这里指信号脉冲）对晶闸管的关断不起作用。只能通过辅助电力电子装置以及阴-阳极电路来实现阴-阳极电路的电流强制过零。一个典型的配置是使用一个电容和一辅助晶闸管，如图2.13所示，晶闸管通过门极打通时对电容C充电。辅助晶闸管关断，因此电容放电导致主晶闸管的阳极电路强制为零