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  • Axion Power Concentrator 203: Jan. 27: Axion Power PbC Batteries Continue To Demonstrate Effectiveness For Railroad Applications Norfolk Southern [View instapost]
    DRich,

    Likewise Teslas have direct electrical motor drive without a multi-ratio transmission. But it wasn't trivial for them: the original Tesla Roadster was prototyped with 2 gear ratios as I recall.

    The differences are:

    Cars have several times the power/weight ratio of trucks. Higher specific power allows a drive ratio that favors higher speeds while maintaining enough low speed torque.

    Locomotives should need less low speed torque than trucks for two reasons, explaining their lack of a multi-speed transmission.

    Locomotives can leisurely start moving, bit by bit from a stop without being bothered by traffic.
    Second, locomotives would require reduced zero-speed starting torque due to reduced starting friction from their use of steel vs rubber wheels. (I wonder if this point could be somewhat countered by their traditional use of journal bearings for rail axles...have they changed to some variation of roller bearings...feel free to explicate.)

    A beefier electric motor would help get rid of that annoying transmission which adds complexity and parts. (Tesla got rid of their transmission using improved electric motor drive circuits.) It would also address the middle and high speed acceleration issue reported by our emissaries.

    Finally, a stronger motor would mean that the number of PbC batteries per truck would not decline as Axion helpfully suggested was possible under earlier assumptions. If anything a few more batteries could only help. Switching customer dollar flow from funding that annoying transmission to funding more PbC (c) batteries without changing the customer price of the ePower product is a good thing.

    Ps.
    Is there a technical faq somewhere for posters? Mine rarely appear immediately below and indented from the replied-to post. Thanks.
    Jan 30 08:12 PM | 4 Likes Like |Link to Comment
  • Axion Power Concentrator 203: Jan. 27: Axion Power PbC Batteries Continue To Demonstrate Effectiveness For Railroad Applications Norfolk Southern [View instapost]
    Thanks for the compilation, Carlos.

    A correction:

    "The PbC battery has much lower voltage per cell".
    No, that is not Dr Buiel speaking. That claim and the rest of point #5 is the anonymous questioner mixing up various allegations with the obvious to keep things well confused.

    Isn't the difference in voltage per cell only around 5%?

    The lack of quotation marks throughout the thread makes the original very hard to follow and it is a valuable service that Carlos attempted the compilation and successfully overcame numerous traps.
    Jan 30 01:45 AM | 7 Likes Like |Link to Comment
  • Axion Power Concentrator 203: Jan. 27: Axion Power PbC Batteries Continue To Demonstrate Effectiveness For Railroad Applications Norfolk Southern [View instapost]
    You likely know this already, Rick, but for others, Kurzweil's crystal ball gazing is controversial and looks best when measured by himself or his acolytes.

    Former Scientific American editor John Rennie in December 2010 issue of IEEE Spectrum: "On close examination, his clearest and most successful predictions often lack originality or profundity. And most of his predictions come with so many loopholes that they border on the unfalsifiable."

    Also, Forbes "Ray Kurzweil's Predictions For 2009 Were Mostly Inaccurate":
    forbes.com/sites/
    /alexknapp/2012/03/20
    /ray-kurzweils-
    predictions-for-
    2009-were-mostly
    -inaccurate/
    Kurzweil is given the courtesy of a huge rebuttal where he explains that he was (supposedly) understating his accuracy. Amidst all the detail he conveniently leaves out actual quotations of his predictions.
    Jan 30 01:04 AM | 3 Likes Like |Link to Comment
  • Axion Power Concentrator 201: Jan. 22: Axion Power PbC Batteries Continue To Demonstrate Effectiveness For Railroad Applications [View instapost]
    John Petersen writes
    “If it has a plug, then a PbC is a suboptimal solution compared to NiMH or lithium-ion.”

    Norfolk Southern's NS999 has a plug....and it happily uses the PbC.

    You PbC basher.

    OTOH the NS999 does not stray far from home.

    A loco that does go far from home and is also planned to be PbC outfitted is NS's upcoming road loco which I suspect will also have a plug. In that case the plug is likely to be a secondary or tertiary power source unlike the intended primary use for a car's plug.
    Jan 23 10:15 PM | Likes Like |Link to Comment
  • Axion Power Concentrator 201: Jan. 22: Axion Power PbC Batteries Continue To Demonstrate Effectiveness For Railroad Applications [View instapost]
    My above comment is out of context there -- it got shifted to a later spot (while in the comment approval queue).

    Context was intended as a calming response to 48's "overarching concern" about OEMs bypassing "simple SS and microhybrids"...."right to mild-hybrid en masse? “.
    Jan 23 04:03 PM | 2 Likes Like |Link to Comment
  • Axion Power Concentrator 201: Jan. 22: Axion Power PbC Batteries Continue To Demonstrate Effectiveness For Railroad Applications [View instapost]
    Now that a Cadillac version of Volt is in the pipeline is it time to consider again what GM intends to do for cost reduction of the Chevrolet version?

    Many Concentrators ago some posters brought up tidbits from GM indicating big hopes for cost reductions in 2nd and/or 3rd generation Volts.

    Will the Cadillac version give GM new flexibility – due to market segmentation – in redesigning the Chevy version for cost reductions? Lithium for glamor and max range to be sold to the few, while PbC sold to the many.

    We don't usually think of plug-in hybrid as optimum PbC territory but we here in the Concentrator don't have all data we would like. If range would be useable, should there be advantages for real-world customer economics, environmental temperature flexibility, safety and recyclability?
    Jan 23 04:02 PM | 2 Likes Like |Link to Comment
  • Axion Power Concentrator 201: Jan. 22: Axion Power PbC Batteries Continue To Demonstrate Effectiveness For Railroad Applications [View instapost]
    Could be good news.

    Not to speak for JP, but when describing the micro-hybrid spectrum as light, medium and heavy he has always identified the heavy end as an especially sweet spot for the PbC.

    A broadening of auto industry interest from minimally effective systems toward the heavy micro-hybrid and light mild-hybrid is what you might have prayed for earlier. Now that there are rumblings that it might happen, should we not be seeing a little more joy in your downcast eyes? It also means more battery sales per vehicle. Chin up, 48.
    Jan 23 05:32 AM | 2 Likes Like |Link to Comment
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