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  1. Ken Taylor

    New Bafang Crank-Drives

    Both handsets run IP bike always and often I run Spotify, Speedict or Google direction finding on a new route. While I wish there were two power channels, cycling apps only provide a single power channel, intended for human power. So, because I measure human power and bike power I've found the...
  2. Ken Taylor

    New Bafang Crank-Drives

    I'm wondering why you want to "turn on a USB power port". If you want to, then a power switch on the battery provides a mechanism to do it without modifying the motor. The batteries from Em3Ev come with an off switch. I have one of these but I also use other batteries that are always on. I run a...
  3. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    I've been puzzling over this and come to the view that downloading a driver direct from FTDI is exactly what you shouldn't do. FTDI have a problem in that they were losing market share. Other people were supplying chips that were different internally but had the FTDI interface so worked with...
  4. Ken Taylor

    New Bafang Crank-Drives

    This is a question for the programming thread but the answer is:- I've tested that this setting works. As an aside and because I see you also have a 350W BBS01. You can make a 350W BBS01 the same as a 250W BBS01 by changing the Limited Current (A) from 18 to 15 or vice versa. The only other...
  5. Ken Taylor

    New Bafang Crank-Drives

    A right one is difficult but I got a left crank arm from ebay. Fortunately I only damaged the left one. You need 170 mm with minimum offset. Something like this...
  6. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    On a slightly different note I'm finding habituation kills your judgement on the effect of assist. The first taste seems great but like a heroin addict, you keep needing more to get the buzz and withdrawal is horrible. I ride around Lake Burly Griffin several times a week which is probably...
  7. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    There is still some interest in how to avoid damaging the controller. One person lost two of them. Em3EV has suffered warranty claims and astmacca sums up the current, incomplete, consensus Keeping the cadence up wouldn't be necessary if there was phase current limiting in the Bafang...
  8. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    Yes, I'm curious too. Hopefully I'll see an explanation here. I thought the suggestion of a high limit to stop the the motor pushing faster than the rider can match was convincing. There are substantial energy savings in limiting the assist speed, at a rideability cost. I don't know but on on...
  9. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    I might give it a go but it's a long way down the priority list and it will not happen this weekend as I'm participating in the lifecycle event. It's too hot to ride at the moment, hence the reply. The data above is from early testing before I realised that setting Keep Current(%) to 100 mostly...
  10. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    I've found setting Keep Current(%) to 100 makes power largely independent of cadence which is not "almost the same" as the trace below with Current Decay set to 8 and Keep Current(%) set to 20. In the other traces Keep Current(%) was also set to 20 but Current Decay was set to 4 which were...
  11. Ken Taylor

    Field Oriented Control using dsPic33

    At 2.11 http://youtu.be/VVPsDme0YHU?t=2m12s request goes to 0 for about 2 secs but response doesn't. Why is that, perhaps a loss of signal?
  12. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    OK, but I don't consider them optimal yet and optimal depends on what you are aiming to achieve. I'm trying to optimise for 80km - 200km ranges, riding with stronger and lighter unpowered riders. Just enough assist to stay with the best of them. It is apparent there are no settings that get all...
  13. Ken Taylor

    Field Oriented Control using dsPic33

    I've no doubt they are "following each other pretty closely" but your explanation indicates the current instrumentation can not show the delay between request and response. Great project.
  14. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    I'm not sure I've understood this but I've read it as the Mode setting on the Throttle Handle tab is affecting behaviour in PAS mode. I'm fairly confident this is not the case. Settings on the Throttle Handle tab only affect behaviour in throttle mode. I've looked through my ride data and I...
  15. Ken Taylor

    New Bafang Crank-Drives

    You need instrumentation and post ride analysis in Strava or similar to reasonably quantify your behaviour. There is also a discussion on cadence in the programming thread including test data for the BBS01 in this post...
  16. Ken Taylor

    Field Oriented Control using dsPic33

    In the video audio it says the bottom left graph is the measured quadrature current and the bottom right is the requested quadrature current and that you should see them following each other pretty closely. I did see them following each other pretty closely but the measured quadrature current...
  17. Ken Taylor

    New Bafang Crank-Drives

    One issue jpo doesn't mention is weight and I notice the Fuji Absolute 2.0 hybrid aims to be light, 10.7 kg in one forum. The BBS01 is half a kilo lighter than the BBS02, not a huge difference but if you are happy to carry an extra half kilo, extra battery is more useful than more metal...
  18. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    Yes, I can see if there is more power being provided from the motor than is needed to maintain the current speed you could easily get a situation where the motor lifts the speed and hence cadence higher than is comfortable for a rider, which would be annoying. This happens when descending...
  19. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    If you are running near your maximum cadence for assist, 75 rpm in your case, and putting out 180 Watts of human power and adding 100 W at the wheel of assist, which are realistic numbers, then you try to up your human power by 20 watts by increasing cadence it's not enough to overcome the loss...
  20. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    Thanks for the response. If that is your goal, use the Speed Limited box on the Pedal Assist tab. This is road speed where Limit Spd(%) on the Basic tab is cadence. I was fooled by that but was put right by pjgold. Yes, but it sounds like you would prefer road speed and are using cadence as...
  21. Ken Taylor

    Programming the Bafang Middrive BBS01+BBS02

    You provide some reasoning on how cadence cut offs may not be disadvantageous but I'm wondering what is gained by limiting cadence. Your setting of 75 is a low maximum cadence, it is around an average for most people which means most people will spend a lot of time above that. Higher cadence is...
  22. Ken Taylor

    New Bafang Crank-Drives

    I ran 7 speed 12-34 for 4000 km. It was OK but I frequently found one gear was a bit low and the next a bit high on a road bike. I'm not sure if one more would have been enough. I'm finding 10 keeps them close enough together that I don't keep oscillating up and down and so far haven't broken...
  23. Ken Taylor

    New Bafang Crank-Drives

    tungsten2K broke a 9 speed chain and I notice 11 speed chains breaking quite often on unpowered bikes. While it's fine so far I'm worried that my 10 speed is already not strong enough and run lower power than most here. I'd have thought chain failure with an 11 speed is a high risk with a higher...
  24. Ken Taylor

    New Bafang Crank-Drives

    Thanks Sam, I'd be interested. I want to keep the weight down as much as possible and for me the BBS01 has more power than I need. However, the low maximum cadence forces you to change your pedaling style and is hard to manage. Changing down too early on a hill climb can mean a complete loss of...
  25. Ken Taylor

    New Bafang Crank-Drives

    The motor wind is different as well. Yes, because it is physically bigger and heavier with more cells. Range is proportional to watt hours if you keep the same riding style. In general, range is uncorrelated with battery voltage. The V8 is likely to be operating at a point of lower efficiency...
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