DSP-based ignition delay monitor and control of an electro-discharge machining process
This work proposes a monitor and controller of the ignition delay percentage (T-d%) of the discharge pulses, to maintain the rate of erosion in the electro-discharge machining (EDM'ing) process. A digital signal processor (DSP) interfaced with two comparators and a digital-to-analog converter (DAC) is used to implement the monitor. A flexible program calculates an accurate T-d% and then presents the results on a DAC. An optimal proportional (P) controller is also implemented in the DSP with the maximal performance index that equals the inverse of the square of the error to the input of a step to achieve fast track performance. Suitable feed signals can be generated by the DSP to drive the servo motor of the EDM and maintain the rate of erosion. The hardware and software architecture are implemented in the real EDM to verify the improvement in electro-discharge machining efficiency.
dsp monitor electro-discharge machine gap control cnc