Fundamentally, wouldn't they be the same? Wouldn't I use the same fundamental equations for Lorentz force? There may be some simplifications due to forces canceling, but I thought the fundamentals would still be the same. A MLCC capacitor is stacked whereas electrolytic and film would commonly...
I think my question has to do with how quickly the electrical energy is released. Releasing it very rapidly (a short circuit) will create a high di/dt which creates a high B field. The Lorentz force is related to JxB so a very high B field (caused from the short circuit) will create a very...
Yes I have. I searched something like "capacitor failure from Lorentz force", but nothing useful came up. A lot of stuff on capacitor failure mechanisms not related to the mechanical forces due to short circuit.
I just searched the same term you used and there are more hits for "short circuit"...
I understand that they may be more prone to thermal failures. I'm not trying to determine what issue is most likely to cause a capacitor to fail. I'm interested in the very specific case of how short circuit faults effect them due to the Lorentz force their parallel plates are subject to.
I2R losses are not my concern. I understand that if the temperature is allowed to rise then it can destroy that capacitor. If the short circuit is short, the capacitor MAY not have time to overheat.
I appreciate the link. I'll read through it because I can always learn. There may not...
I think its similar to parallel conducting wires too. I've seen papers where they do this type of analysis for transmission lines to determine spacing between then so they can ensure the phases don't short from swinging into each other. Of course faults aren't the only reason the lines can swing...
Yes, I understand that they have a ripple current rating which limits heating. Forces would also be low if we're only considering ripple. But if you short your DC-link capacitors, you can have a huge fault current. Depending on the application, it can be so large that it rips the bus bars off of...
I am searching online for resources regarding studies done on the effect of the Lorentz force due to short circuit faults in capacitors. Although a DC-link capacitor only sees the ripple, there would be high current during a fault. Since F=(qE + JxB), I am curious what the effects of the high...
I'm using Comsol Multiphysics here. Really, it can be done in any software that can solve electrostatics problems. That would include Matlab as well, as long as you define the system. Using something like Comsol, Ansys Maxwell, or the like simplify the problem since you can easily define shapes...
Sorry for the confusion. I've attached a new picture here with everything labeled. The voltages and spacing isn't necessarily important here as this is just to show a simplified example of what is really happening in the PCB in terms of e-field distribution.
This is an example of PCB cross...
Hi Rive,
I think my post was poorly worded in terms of what I was asking and stating. I apologize for that because it has caused some confusion. Before I clarify, let me say that I understand the reason not to worry about this too much is because its easier to over design and not have to worry...
Thanks for the suggestions. I am in no way trying to use this as my only source of information. I've reviewed literature in those areas which has helped me a lot. There is always more to read as you can find useful information in all areas.
Compared to the standard technology used for this...
My goal with this post was not to argue. It was simply to get different perspectives on how to approach this to help with research ideas. I understand that everyone's answer has been to "be conservative" and doing do several kV on a PCB. Fortunately, I am doing this as research so I can afford...