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  1. spkpn

    cpm 90 motors

    actually, I think that the prices for these motors including controllers (both automotive grade products) to be very interesting^^. Thez look like a high quality and very efficient drivetrain imho. However, If they offered a build in (Chain-driven) CVT instead of a 2 gears system I would be even...
  2. spkpn

    Dr.Bass Steveo found 7s3p Module! Awesome Price!!

    sign me up for 3 of the 3p7s modules or alternatively for one of the 28s2p modules.
  3. spkpn

    Sensorless Controller Solution?

    the confusion my posts provocated are probably due to a translation error. What I meant when I wrote "flywheel clutch" was actually a centrifugal clutch sorry for the confusion.
  4. spkpn

    Sensorless Controller Solution?

    sry for my late answer. what I meant is neither :) it is just a system that if the motor turns below a certain rpm (say below 3000rpm) it is not loaded. As it accellerates the clutch begins to "grab" and the motor starts to do some actual work. I assumed that it is problematic for the...
  5. spkpn

    A123 AMP20M1HD-A Battery pack kit

    Id be interested in a 2p set up..
  6. spkpn

    Sensorless Controller Solution?

    perfrctly possible that I am completely missing the point but wouldnt a flywheel clutch be an easy mechanical solution to that problem?
  7. spkpn

    Sensorless Controller Solution?

    I cant really give an answer to that I am afraid. To many technical terms that I have no idea what they mean. Hopefully there will be time in the future so that I can read some stuff explaining all that :). However, what I meant to say was that I heard (also here on the forum, I think) that some...
  8. spkpn

    Confused about power ratings...

    Do they offer a torque mode? I think kellys do (not sure tough).
  9. spkpn

    Sensorless Controller Solution?

    Hi, this is a topic that I am very interested in recently. As I see it at the moment (and I could very well be wrong), there are two problems with sensorless motors at the moment. 1) sensorless controllers seem to often have trouble to turn an electric motor at low rpm and high load. A...
  10. spkpn

    Adding hall sensors to outrunners

    Hello, I might be interested in halls that can be mounted to the turnigy 80-100 series motor. But only if a mechanically untalented guy like me can acomplish the job ;). What is the price? rgrds, spkpn
  11. spkpn

    What's it called when larger capacity uses more Ah/Wh?

    First, I think that this effect would affect a smaller pack more than a larger pack. Second the peukert effect is not something that causes dramatic capacity decrease in lithium batteries (at "normal" use) afaik (much more relevant for lead batts).
  12. spkpn

    suitable hall sensors

    thanks for your help! Is this the sensors that you mentioned: http://ch.mouser.com/search/ProductDetail.aspx?qs=%2Ffq2y7sSKcI1%252b7w80VWwIg%3D%3D if so, they are cheap enough not to consider the standard... Thanks again
  13. spkpn

    Beware American A123 prismatic cells!

    even if it is no coincidence, it is still open which is the cause and which is the effect ...
  14. spkpn

    suitable hall sensors

    nobody has any advice on which hall sensors are best suitable for my project?
  15. spkpn

    suitable hall sensors

    Dear all, I emailed scorpionsystems to ask whether they also sell their Scorpion HK-7050 motor equipped with hall sensors (and different windings). The answer was yes :) more specifically: now i need advice on which to use so that I can then use a kelly BLDC motor controller to control the...
  16. spkpn

    A123 Technology and Chinese Manufacturing

    +1 further, a123systems has done everything not to do business with end users....no surprise somebody would jump in to take this business oportunity...
  17. spkpn

    Envia Systems twice the energy density of lithium cobalt

    He said that he wanted a 100 miles pack and I guess he doesnt plan to do his 100Miles in 1.5 minutes :twisted: However, I agree that nanotechs are better for dragracing than the batteries discussed here nanotech: almost 15kW/Kg of powerdensity envia(if they are good for 1c): 0.4Kw/Kg...
  18. spkpn

    Envia Systems twice the energy density of lithium cobalt

    Why would I wire them all in series :?: Parallel blocks are basically one cell (no need to manage them individually). I could (if I had such cells^^) for example build a 20P36S pack from the 45Ah cels to get a 120KWh, 133Volt Pack that weighs 300Kg (ok assume 500Kg) and cost about 18K$...
  19. spkpn

    Envia Systems twice the energy density of lithium cobalt

    And a 1000Mi range pack will also deliver quite some power at low c rates. And just to mention it, it doesnt matter how the pack is wired (many parallels or many in series). The possible output in power is determined from the numbers of cells in total (not the number of cells in parallel or series).
  20. spkpn

    Envia Systems twice the energy density of lithium cobalt

    arrghh...1/3c is a quite common rate of discharge when measuring cell capacity....it doesnt tell you nothing whatsoever (good or bad) about how the cell performs at say 5c? Also, I think you should get away from looking at those c values, they dont mean much! What counts (for Power) is power...
  21. spkpn

    Envia Systems twice the energy density of lithium cobalt

    I wonder whether anybody read my earlier post here??
  22. spkpn

    A123 20Ah cells price down to 17.50$ per cells?

    of course without (how could the price be invariant under different duties for different countries otherwise ;) ). However, they offer a "workaround" I wont be to specific about it but I guess u can imagine..
  23. spkpn

    A123 20Ah cells price down to 17.50$ per cells?

    I am also interested in eu group buy. But also consider that from a123rc it is possible to get the cells for 32$ shipping to your door included for any number of cells...
  24. spkpn

    high rpm motor and controller

    I think this is a good example for a question that is best resolved by experiment...so I will go torque controll and then we can compare our experiece gwhy :)
  25. spkpn

    high rpm motor and controller

    checking on the available motor windings again, I might have to go with a 72V set up (24s1p orf 24s2p).
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