<div>I agree, the more current flow the more of a load. I know about shorting the motor terminals, but if there is a perfect short between the motor terminals, where is the "load". A perfect short will not have any voltage across it, so no power dissipated external to the motor.</div> <div> </div> <div>Bob R.</div> <div> <BR><BR><B><I>Jay Marshall <lightfoot@sc.rr.com></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <META content=Word.Document name=ProgId> <META content="Microsoft Word 10" name=Generator> <META content="Microsoft Word 10" name=Originator><LINK href="cid:filelist.xml@01C63541.DA098080" rel=File-List> <STYLE> <!-- /* Font Definitions */ @font-face {font-family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:1627421319 -2147483648 8 0 66047 0;} /* Style
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size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></FONT></div> <div class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></div> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; 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></div> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></div> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">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></div></DIV> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></div></DIV> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">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></div></DIV> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></div></DIV> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">Bob R.<o:p></o:p></SPAN></FONT></div></DIV> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"><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></div></DIV> <BLOCKQUOTE style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; MARGIN-TOP: 5pt;
PADDING-LEFT: 3pt; MARGIN-BOTTOM: 5pt; PADDING-BOTTOM: 0in; MARGIN-LEFT: 3pt; BORDER-LEFT: #1010ff 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none"> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; 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></div></DIV> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></div></DIV> <DIV> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Ed</SPAN></FONT><o:p></o:p></div></DIV> <BLOCKQUOTE style="MARGIN: 5pt 0in 5pt 3pt"> <div class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE:
12pt"> <o:p></o:p></SPAN></FONT></div></BLOCKQUOTE></BLOCKQUOTE></DIV>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE><BR>