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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: jmuchow@SPAMMENOTcamlight.com (John Muchow) Newsgroups: sci.electronics.basics,sci.electronics.design,sci.electronics.misc Subject: Re: Reducing contact resistance for low volt use? Date: Tue, 07 Jan 2003 03:39:15 GMT Organization: MindSpring Enterprises Message-ID: <3e1a45e4.14135724@news.pipeline.com> References: <3df66fb5.14200838@news.pipeline.com> <C.D.H.Williams-1012022324420001@cw-mac.ex.ac.uk> <3df68c6f.21555882@news.pipeline.com> <fgih1vgh1an6517edlmhi3gkidkhkah2i8@4ax.com> <3e190f7b.3476211@news.pipeline.com> <ae1j1vkeo89125tic0vmunerplr6q0po84@4ax.com> Reply-To: jmuchow@SPAMMENOTcamlight.com NNTP-Posting-Host: a5.f7.2c.ae X-Server-Date: 7 Jan 2003 03:41:06 GMT X-Newsreader: Forte Free Agent 1.21/32.243 >>>>>>With 20-30 cells in series powering that motor, that's a lot more than >>>>>>100A, even with wire and connection resistance. >>> >>> You keep getting this ass backwards. Series batteries do NOT >>>produce ANY more current than does any one single cell in the pack. You keep confusing the configuration of the battery packs used in the machines we're discussing and the configuration of the cells tested with the discharger I'm building. If one cell won't deliver the current I need through the discharger (with the MOSFET full on), then I can add a second cell (or more) in series. This higher voltage will cause more current to flow. I can then measure the voltage across one cell to determine its performance at that, now higher, discharge current level. >>> Nice embellishment, but quite meaningless. Instead of operating >>>outside the levels of design for the batteries AND the motors, you >>>should select a motor that does the same job at the PROPER voltage. WHAT??? HUH??? There are almost no components run at their rated values inside a combat robot!! If we had the weight allowances to do so, we might just do something like that...but I doubt it. Someone would very quickly up the voltage to the motor and gear it down more for more torque and acceleration. Especially since they know that the motor will still last WAY beyond the point they need it to. >>> Juicing up a motor over its spec is a step backward as they go DOWN >>>in efficiency as you go up in voltage, regardless of the observed >>>"benefit". That's a great theoretical spec but it doesn't affect most builders as they'll just increase the voltage further to make up for the inefficiencies. I don't care if the motor draws 120% more current at double the voltage due to decreased efficiency. I get a LOT more torque and speed anyway. It doesn't matter to builders that they can't get the theoretical maximum efficiency as they can't fir the batteries and motors need to do so in the robot. >>>There are plenty of high torque motors that can >>>perform at the same (better) levels as your overtweaked motors do. I invite you to find one that can perform better than the ones currently in use. Hundreds of people have been searching for motors for these applications for years and hundreds of motors have been tested....by folks who know a lot more about motors than you and I do. Any of us can find a high-torque motor that operates more efficiently at the voltages we have available. Finding one that has a machined (not cast) mount that can survive a high-G smash or being flipped 6ft. into the air is another matter. How about surviving a stall-condition because my frame and motor mounts got smashed by a 27-lb tool steel bar spinning at 2000RPM? Many high-torque motors burn out in seconds when stalled. How much would your motor cost? If I have to replace one every event, it better be inexpensive. How about not being larger than the wheel diameter of my robot (down to 2.5")? Does it have a shaft that I can attach my gears or sprockets to? I don't have room for a brushless motor controller, better be PMDC. Does it have terminals that I can use? Most motors have terminals sized for their "typical" applications, not near-stall conditions. Does the motor weigh more than the ones we're using? I can't use the extra torque if I don't have the weight budget for it. Several motors are currently used by the different weight classes in combat robotics and R/C plane and car users have their own set of motors (with some crossover between the two). Lots of research has gone into these motors...*especially* the plane/car motors. But, new ones are found occasionally and you'd have lots of friends in the combat robot or R/C communities if you showed up with all these motors you say you can find. I look forward to reading about these motors that you'll soon recommend...especially in the R/C and BattleBot Yahoo forums. >>> You are shooting yourselves in the head, much less the foot. I feel like doing just that after answering all these separate posts. :-) John Muchow -- Remove "SPAMMENOT" to reply via e-mail -- </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>