We design a suit of aviation AC excitation generator system, it insures the output voltage is constant frequency and constant voltage.

我们设计了一套航空用交流励磁发电机系统，以保证输出电压恒频恒压。

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At the same time, constant engine speed stabilizes output displacement of hydraulic pump and then stabilizes travel speed and vibratory frequency in turn, so that compaction quality is increased.

同时，发动机转速的恒定也使液压泵输出排量稳定，进而保证了行走速度和振动频率的稳定，提高了压实质量。

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Keeping slip frequency constant we can get nearly constant torque output characteristic.

维持滑差频率不变，就可获得近似于恒定转矩的输出特性。

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