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Electric discharge machine with output power control

  • US 6,806,434 B1
  • Filed: 11/22/2002
  • Issued: 10/19/2004
  • Est. Priority Date: 05/26/2000
  • Status: Expired due to Fees
First Claim
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1. 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; 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.

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