Electric discharge machine with output power control

An electric discharge machine in which high frequency electric power is supplied between poles of an electrode and workpiece by a high frequency electric power unit composed of a DC electric power source, oscillator and amplifier and impedance is adjusted by a matching circuit so as to generate electric discharge between the electrode and workpiece and conduct machining on the workpiece, the electric discharge machine comprising:

• an electric power detecting means for detecting output electric power of DC electric power source of the high frequency electric power unit, including voltage detecting means and current detecting means;
• a control means for controlling output electric power of the DC electric power source to be constant on the basis of a difference between a machining command signal for giving a predetermined electric power command and an electric power detection value detected by the electric power detecting means;
• and
• wherein said voltage detecting means and said current detecting means are arranged between an output of said high frequency electric power unit and said matching circuit.

An electric discharge machine in which high frequency electric power is supplied between poles of an electrode and workpiece by a high frequency electric power unit composed of a DC electric power source, oscillator and amplifier and impedance is adjusted by a matching circuit so as to generate electric discharge between the electrode and workpiece and conduct machining on the workpiece, the electric discharge machine comprising:

• a voltage detecting means for detecting output voltage V of the high frequency electric power unit;
• a current detecting means for detecting output current I of the high frequency electric power unit;
• a calculation means for calculating α·V+β·I where V is an output voltage detected by the voltage detection means, I is an output current detected by the current detection means and α and β are predetermined coefficients;
• and
• a control means for controlling α·V+β·I, which is an output of the high frequency electric power unit, to be constant on the basis of a difference between the predetermined working command signal and the calculation value of the calculation means.

An electric discharge machine in which high frequency electric power is supplied between poles of an electrode and workpiece by a high frequency electric power unit composed of a DC electric power source, oscillator and amplifier and impedance is adjusted by a matching circuit so as to generate electric discharge between the electrode and workpiece and conduct machining on the workpiece, the electric discharge machine comprising:

• a voltage detecting means for detecting output voltage V of the DC electric power source of the high frequency electric power unit;
• a current detecting means for detecting output current I of the DC electric power source of the high frequency electric power unit;
• a calculation means for calculating α·V+β·I where V is an output voltage detected by the voltage detection means, I is an output current detected by the current detection means and α and β are predetermined coefficients;
• and
• a control means for controlling α·V+β·I, which is an output of the DC electric power source, to be constant on the basis of a difference between the predetermined working command signal and the calculation value of the calculation means.

An electric discharge machine in which high frequency electric power is supplied between poles of an electrode and workpiece by a high frequency electric power unit composed of a DC electric power source, oscillator and amplifier and impedance is adjusted by a matching circuit so as to generate electric discharge between the electrode and workpiece and conduct machining on the workpiece, the electric discharge machine comprising:

• an electric power detecting means for detecting output electric power of the high frequency electric power unit, including voltage detecting means and current detecting means;
• a control means for controlling output electric power of the high frequency electric power unit to be constant on the basis of a difference between a machining command signal for giving a predetermined electric power command and an electric power detection value detected by the electric power detecting means;
• wherein said voltage detecting means and said current detecting means are arranged between an output of said high frequency electric power unit and said matching circuit;
• and
• a resistor connected in parallel with the poles.

An electric discharge machine in which high frequency electric power is supplied between poles of an electrode and workpiece by a high frequency electric power unit composed of a DC electric power source, oscillator and amplifier and impedance is adjusted by a matching circuit so as to generate electric discharge between the electrode and workpiece and conduct machining on the workpiece, the electric discharge machine comprising:

• an electric power detecting means for detecting output electric power of the high frequency electric power unit;
• a resistor connected in parallel with the poles;
• a loss detection means for detecting a loss caused by the resistor arranged between the poles;
• a calculation means for finding a difference between the output electric power detected by the electric power detection means and the loss detected by the loss detection means;
• and
• a control means for controlling a difference between the output electric power of the high frequency electric power unit and the loss caused by the resistor arranged between the poles on the basis of the working command signal for giving a predetermined electric power command and also on the basis of the calculation value of the calculation means.

An electric discharge machine in which high frequency electric power is supplied between poles of an electrode and workpiece by a high frequency electric power unit composed of a DC electric power source, oscillator and amplifier and impedance is adjusted by a matching circuit so as to generate electric discharge between the electrode and workpiece and conduct machining on the workpiece, the electric discharge machine comprising:

• an electric power detecting means for detecting output electric power of the DC electric power source of the high frequency electric power unit;
• a resistor connected in parallel with the poles;
• a loss detection means for detecting a loss caused by the resistor arranged between the poles;
• a calculation means for finding a difference between the output electric power detected by the electric power detection means and the loss detected by the loss detection means;
• and
• a control means for controlling a difference between the output electric power of the DC electric power source of the high frequency electric power unit and the loss caused by the resistor arranged between the poles to be constant on the basis of the working command signal for giving a predetermined electric power command and also on the basis of the calculation value of the calculation means.