| 摘要 |
PURPOSE:To prevent failure of working by performing frequency spectral analysis of the inter-pole gap discharge waveform and deciding between normal and abnormal discharge thus deciding whether the inter-pole gap state is normal or not. CONSTITUTION:Frequency spectrum of discharge voltage waveform in the gap between the electrode and workpiece is analyzed to identify between normal and abnormal discharge states by means of an abnormal discharge detecting means. For any state of spectrum, high output having frequency f0 corresponding to the reciprocal number of period (T) is produced. If the output is low for fo high for fH, it can be considered to be normal discharge. Consequently abnormal discharge can be identified. |
