3 ms·
Yes, but the added weight of something as large as a 1kW resistor compromises the portability of the board. We're looking into how to do this without adding we
by skdoo 12y ago
Yes, but the added weight of something as large as a 1kW resistor compromises the portability of the board. We're looking into how to do this without adding weight.
- tomsaffell 12y agoWould it be possible to arc it over an air gap? I.e. allow the energy be dissipated over the resistance of the air? I have no idea whether the power numbers work out, and maybe you'd need to step up the voltage, which adds complexity. Just a thought..
- skdoo 12y agoInteresting idea. I think you won't be able to dissipate enough heat this way, but I'm not sure.
- mikeyouse 12y agoA bit of a higher price point, but some Formula 1 teams went through similar issues with their KERS system in regards to performance and weight. I think everyone converged on extremely high speed flywheels, but there was a fair amount of work into ultracapacitors. I'd imagine a 1,000F ultracap could handle the ~20-30 seconds of 100W braking power at well under a pound? I know nothing of their reliability or availability and I'm sure you guys have done your own research but just thinking out loud.
- skdoo 12y agoThere are some excellent cells out there developed for KERS. One example: http://www.ebaracus.com/product/a123-ahr18700-f1-kers-cells http://www.ebaracus.com/product/a123-ahr18700-f1-kers-cells
- beambot 12y agoRandom thought: Would it be possible to incorporate a resistor directly into the board stackup -- eg. the "board" part itself becomes a large carbon resistor?
- skdoo 12y agoCool idea! I'm not sure about the conductivity or thermal properties of structural carbon fiber, but it may end up being a good option.