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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>No, a load implies that there is current
flowing, which produces heat. Unless the current is flowing back to the battery
there is no load. Try this: take a small DC electric motor and spin the
armature, then short out the power terminals and try to spin it. The latter is
maximum load and the difference is dramatic.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Bob Richards<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, February 19, 2006
9:29 AM<br>
<b><span style='font-weight:bold'>To:</span></b> NSRCA Mailing List<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Electric vs. Glow</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Maybe I'm not understanding what you are saying.
Regenerative braking would cause less downline braking than a freewheeling
motor?<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>If you are comparing regenerative braking with non-regenerative
braking, I would think the motor would heat less, since with non-regenerative
braking the motor windings ARE the load, are they not?<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Bob R.<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>Ed Alt
<ed_alt@hotmail.com></span></i></b> wrote:<o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 3.0pt;
margin-left:3.0pt;margin-top:5.0pt;margin-bottom:5.0pt'>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Also, though it's a great thing if
it can be implemented well, regenerative braking will contribute to
heating of the motor and it may actually reduce the downline braking effect
somewhat. If you don't dissipate the energy into a load, the motor will
spin at a higher RPM while windmilling, effectively incr! easing the disc area
and allowing it to cool a little bit on downlines. Re heating, when a
load is applied (the battery under charge in this case), the voltage
generated by the motor windings now results in a fairly significant
current flow (no, or very little flow happens without the charge path
closed). This will result in electrical power being dissipated in the
windings, therefore heating will occur on a downline, not cooling. Also,
since the battery is already running warm, it may not be very good for it to
get these brief and relatively large charging currents. Not sure how bad
that effect may be, but it's got to get evaluated by a battey expert.
Sure would be good to solve the problem and keep everything within safe
parameters though.</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Ed</span></font><o:p></o:p></p>
</div>
<blockquote style='margin-left:3.0pt;margin-top:5.0pt;margin-right:0in;
margin-bottom:5.0pt;border-left:#00! 0000 2px solid'>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</blockquote>
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