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变频电路是将间隙电压值的变化,变为输出脉冲频率的高低变化,来控制计算机,从而使计算机控制步进电机的进给速度,去跟踪放电加工的火花间隙,其原理框图如图1。
The frequency conversion circuit changes the value of the gap voltage into a change of the level of the output pulse frequency to control the computer so that the computer controls the feed speed of the stepper motor to track the spark gap of the EDM.