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    The real argument against Direct Drive Front hubs

    Im not sure a relay would be fast enough for this type of application, depending on the relay...Thing is, it needs to stop the three phase full on signal before it hits the motor; even a 1/10th of a sec might be enough to fly at 20mph. Maybe a frequency filter on each of the 3 phases might work...
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    Seattle Bikepath Muggings

    well, oddly enough i currently am an electrical engineer working at boeing. Sometimes you gotta just change your life, that sort of crap makes you mean after a while...
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    Seattle Bikepath Muggings

    I drove a taxi at night in downtown Seattle for the entire 1990's, and yes there are some very dangerous people in big American cities. In ten years i was never successfully robbed, couple times a year someone would try though. What worked for me was the physiological thing; you have to think...
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    Help! Solar charging a lifepo4 36volt 29 ah battery

    I concur w/ snowcrow, you need an energy storage device for the output of the solar panels. I am assuming your power inverter is 12V? 1 or 2 deep cycle 12V SLA's in parallel, or 2 6v's in series. The ones about the size of car battery would be best. What you are doing is storing the trickle of...
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    apparently, Biofuels aren't the answer

    The tech behind algae is years away from becoming real, but getting it to the local arco station for fillups is what will take the real time. First its got to be economicly viable, which is the rub. Next it has to be mass produced at several huge farms set up somewhere its usually warm. The...
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    apparently, Biofuels aren't the answer

    I like the concept of biofuels, but the reality is that our options are limited and the political/economic situation is bad. Ethenol looked promising at first, but the problem is that we can either feed most of the planet or drive. If the US went full scale alchohol we would have very little...
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    Simple single cell low voltage indicator

    you would definately not want a big divider on the input, try something like this: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=CD4052BCN-ND 3-15V inputs should do fine for individual cells, and you could calculate the 80 ohm on resistace into the comparitor formula.You can...
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    Simple single cell low voltage indicator

    You guys ever use multiplexors? (mux's). I really think you should look into it, would greatly simplify your circuit, i think. Without getting too deep, you could drive the mux using a repeating binary counter to switch it, and just have it cycle a single low alarm comparitor to check the cells...
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    Denver commuter e-bike

    Yo Toshi, You took them pics from gasworks park right? I lived on Queen Ann hill for over ten years. 6th W. and Crockett. Seattle in the house... Interested in your e-bike experiences in our challenging hills/water locality. You work in Ballard, yes? Ya, sure, you betcha. (weak Norwegian...
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    controler in/out questions

    dont post on the internet much, case you didn't notice...
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    controler in/out questions

    im an ass... sorry about that
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    controler in/out questions

    crap, im totaly wrong... time delay sux.
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    controler in/out questions

    i noticed you blocked my post. Sorry i splashed the pond. I guess you are in charge, i was wondering who was.. A controler is both a current limiter and a PWM i think. Brushless needs positional feedback to work, hence the halls. Its stil a DC motor though i think, given the PWM input..I...
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    controler in/out questions

    Greetings, been trying to get my brain around all the controller/ e-bike functions. Could use a little assistance from someone who actually has one and understands how it works. Please correct me if im wrong, but: the hall effect sensors in the motor provide position feedback to the...
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    conceptual question

    Inductance? Whats that??? Kind of like a radiator? it radiates things...I find you sound the most proffesional when you use words like things and stuff. If they understand what you're saying, you aren't saying it right (typical EE thought process). The phase angle between the sinusoidal...
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    conceptual question

    No offense intended with your not quite EE status; you are here learning and thats more than can be said for most engineers ive met...IMO its the drive not the degree which really matters. Your idea to make a voltage divider using a photo reactive resistor on one side is a good one; it might...
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    conceptual question

    So the controller is the current limiting device then... If that is the case you would want the wire gauge a little thicker on the battery side, and a little thinner on the motor side to save weight and minimize voltage drop. The tricky part about wiring is the voltage/current thing. At high...
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    conceptual question

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    conceptual question

    Greetings, Been reading quite a bit here lately. Let me just say right off the bat: good work guys; this is quality engineering stuff all the way, regardless of pedigree. Everything from capacitive soldering design to control system mods, nice. This is an amazing resource. Not trying to sound...
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