Alternative metode for Electrical Discharge Machine

[bunalmis]

In the EDM machines I have reviewed on the internet, the principle of discharging the capacitor charged via the resistor via IGBT without short-circuiting the part to be cut is used.

Instead of doing this, if we increase the current passing through an inductor to a certain value and then suddenly cut off the current, the resulting back emf can jump to the workpiece to be cut in the liquid and the current can be completed from there. I even tried this way and was successful.

Moreover, since no resistor is used in this method, there is no loss.

Why is capacitive discharge technique used instead of this technique?

 

[dick_freebird]

It's been a long time since I looked at EDM but I believe
there are several styles ("sinker" is one, which looked like
it only uses a solenoid to maintain the forming electrode
at a suitable current by pulling back the electrode).

What those different control schemes offer, don't know.
But point is, it's not just one thing.

CDI schemes I think are preferred when you want pulse
current to be much greater than averaged input current
or fuse-rated current. Like if you want 50A pulsed current
in the primary you can't do that on a 10A fuse branch.
You would have to "transform" to a higher value by using
a capacitor.

EDM needs to make an arc energy that removes material
rather than sticking the electrode to the workpiece. Pulse
height may be essential. I sure have trouble welding at low
current.