GGoodrum
1 MW
methods said:
Yipes! I guess there is room in the market for a 160V version.
methods said:
imho: correct however, the faster we power the FETs the lower the power dissappation will be becuase FETs only dissipate alot of heat when they are in the middle between fully on and fully off. Not that what I am saying contradicts your point, just elaborates on the inverse.dnmun said:notes about the capacitance thing. the inductace is a function of di/dt so the less current flow changes and the longer the time it takes to change reduces the back emf generated in the wire, so the voltage spike is reduced too.
You say this with such certainty that I wont even venture to disagree (it sounds logical and reasonable though I can't remember the actual variables)dnmun said:the inductance relationship to length of a cylindrical conductor is exponential and is 2 orders of magnitude higher within 2 cm as i recall. shoulda saved that graph.
Just proofread this one for you and made it I hope a bit clearer = )_dnmun said:That is why they stand them on on the pcb and keep the legs short. it is not the resistance, but rather it is the impedance which would be generated by the inductance of the lead length if they were longer.
methods said:A 24fet board would be a bit asinine...
What is needed is a 6fet or 12fet board that uses fets in a different package size.
These TO-220 fets have tiny little leads and not much heat sink.
You want some fets that need to be bolted down
-methods
I'll say this is a must for the guys who built stupid bikes like me I crashed a hand full of times, my bike is so fast it flips you off when you are not ready for it and sometimes when you are, and I have had others crash as well and that is hard on people and equipment. I love all the power but when riding by the cops or wanting to travel a longer distance this is a must!methods said:Added notes to the first page about the 3 speed switch.
That thing is AWESOME because it is really a THROTTLE governor, not a SPEED governor which means you basically now have variable current limit on your bike!
It can be switched in real time while you ride too - unlike the reverse for which you must stop first.
-methods
Why do I have a fealing you have rubber marks on your ceiling?methods said:DUDE- I once set my Kelly up with the current maxed out, the throttle response set to MAX, and then I switched it from "Speed" control to "Torque" control.
The throttle had all of about 10 degrees of rotation before the bike would explode out from under me.
It was so violent that it was no fun to ride what so ever.
and..... of course I ended up rounding my drops out nice and wide
The 50% setting was nice for when I you are riding the bike with stuff in your arms - like free stuff you find on the side of the road
The 75% setting worked well for spirited riding - did not quite have the snap but it was still fun. That is the setting I would let people try the bike with.
The 110% - watch your ass. Bump the throttle on the wall while walking the bike through the house and you could end up with rubber on the ceiling.
-methods
Arlo1 said:Why do I have a fealing you have rubber marks on your ceiling?
I also welded up my dropouts with some extra steal last night because I could tell if that little axle can lift my fat ass up of the ground it wil spin out of there very soon.