The AC servo system of FANUC 11 series is a AC-DC-AC conversionfrequency speed adjusting system, which use PWM as the speed-adjusting control method.
FANUC一11型交一直一交频调速系统，调速的控制方法为脉冲宽度调制(pwm)法。
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It shows signal harmonics is obviously weakened by the smoothing action in the setting process and there is a best conversionfrequency to minimize harmonic distortion.
The paper introduces the principle, effect of conversionfrequency technology as well as the developing tendency of this industry, and concerning industrial strategies of China is followed.