Search results

Date Relevance Most replies

  1. Malcolm

    Balance charging with DC/DC converters?

    First off, apologies in advance if this is a dumb idea, but my understanding of electronics has never got much beyond the plumbing analogy of current as flow and voltage as pressure. This is a bit of a handicap for an EV tinkerer, but it does have the advantage of forcing me to try to find...
  2. Malcolm

    Austin Mini

    One of the benefits of a northern winter is that there's no real distraction from projects. Still a long way to go, but here are some photos of progress so far. I picked up a couple of series wound motors cheap on ebay, so had to find something to do with them. I shortened them to fit across...
  3. Malcolm

    Maker Faire, Newcastle (UK) 12-13 March

    At the Centre for Life (near the Central Station) and the Discovery Centre on Saturday and Sunday 12-13 April Well worth a visit for anyone in the north east. I've really enjoyed the last couple of fairs and will have a stand at this one, showing off my motorcycle and the drive system for my...
  4. Malcolm

    Must-see lecture on lithium-ion construction and behaviour

    75 minutes long, but well worth watching if you're at all curious about how lithium-ion batteries work: "Jay Whitacre, a Carnegie Mellon professor with a joint appointment in Materials Science and Engineering and Public Policy, gives a quick overview of Lithium-ion batteries. Starting at the...
  5. Malcolm

    Zerotracer – new project for you Kim?

    Looks a little weird to me. Like when I see a duck walk and think it really needs arms. I'd love to have a go in it though (the bike that is, not the duck...) 1ZgAs8H_b04
  6. Malcolm

    Hub motor BB drive

    When is a hub motor not a hub motor? When it's used to drive a chain ring of course... Here's one I made earlier: and there are a few others (much neater) near the bottom of this page: http://endless-sphere.com/forums/viewtopic.php?f=2&t=16535&start=45 Mine uses a cheap MY1018 motor, but has...
  7. Malcolm

    Using dewalt DC9000 as dumb charger?

    I'm using some A123 cells in a "minimalist" 10s1p pack for short trips into town on my ebike, just to give an occasional burst of speed to keep out of the way of traffic and to assist on a couple of hills. I'm using the controller LVC to cut off at 30V. I understand the risks of not having cell...
  8. Malcolm

    Lightweight hub motors?

    On a never-ending quest to build the lightest, stealthiest, most efficient and most reliable ebike at minimum expense, I'm looking for a brushless hub motor weighing no more than 3 kg/6.5 lbs. I plan to use this for another bottom bracket drive. This is the list of possibles so far: Tongxin...
  9. Malcolm

    Freewheeling crank drive (was: Stepper motor as ebike drive)

    I've been looking around at various motor options for ages, trying to decide whether to go for a hub motor or bottom bracket drive. I like the idea of a bottom bracket drive for efficiency and versatility, but the difficulty is finding the right gearing solution. I keep coming across planetary...
  10. Malcolm

    Lesson 1 – check your multimeter first!

    :oops: EDIT: The following is a long ramble about strange battery behaviour that turned out to be the result of a dodgy multimeter, so please ignore it. I've been playing about with some A123 cells from a Dewalt pack for a while, just getting to know them and trying out various cheap and...
  11. Malcolm

    72V 300A brushless controller

    Looking for high-power brushless motors and controllers I came across this: http://www.kellycontroller.com/mot/Brushless-DC-Motor-Controller.html Out in December. It looks like a Chinese company but I've heard a few people mention them and someone I know in the UK has used one of their brushed...
  12. Malcolm

    UK EV meet in Leeds 8 December

    Anyone fancy getting together for a pint and a chat about EVs? I'm a member of the UK Battery Vehicle Society, which recently launched an updated website and forum. The society already arranges various events in the south, so a couple of us are trying to arrange a get together in the north just...
  13. Malcolm

    UK network for charging EVs

    This sounds like a great idea http://www.ev-network.org.uk Basically a map showing all the public charging points for EVs in the UK (very few so far), but the clever bit is that you can sign up to say you are willing to provide opportunity charging to anyone who happens to be in your...
  14. Malcolm

    How to attach a camera?

    Just looking for easy ways to mount a camera on handlebars or forks, etc. I know people have suggested ideas in the past, but can't find them. Thought it might be good to put suggestions together in one place. I just found this...
Back
Top