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第二个理由是很难做到将这些电路的电压控制在一个很大的频率范围内。
The second reason is that it is difficult to make these circuit voltage controllable over a large frequency range.
电源电压应控制在不大于或小于额定电压的5%范围内，如果电压过高或过低都会损坏电机。
Supply voltage should be controlled at not more than or less than 5% of rated voltage range, if the voltage too high or too low will damage motor.
控制系统的功能是在负载随时变化的工况下，确保机组转速恒定，并使电压输出控制在要求范围之内。
The control system functions to keep speed of the machines substantially constant and the voltage within prescribed limits, even the load may change.
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