Accurate identification of micro-EDM discharge state is an important guarantee for high-precision and high-efficiency machining. However

the micro-EDM pulse energy is small

the discharge frequency is high

the process is random

which seriously affect the identification accuracy of discharge state. In order to solve this problem

the characteristics of micro EDM discharge state are studied

and the reasons of each discharge state are analyzed. At the same time

the discharge state is identified according to the difference in the discharge state characteristics. By setting the inter-electrode voltage threshold

the inter-electrode current threshold and the spectral threshold

the accurate and effective identification of the no-load state

the spark discharge state

the stable arc state and the pulse interval is realized

thus providing the basis for efficient servo control.