Any ideas as to whether a $20 1/4" drive torque wrench from eBay will be accurate enough for the 120 - 180 inch - pounds that Deka recommends for the 9A31 battery studs? Thank you, Dave Delman 1981 Electric DeLorean Project electricdelorean.com **************Ideas to please picky eaters. Watch video on AOL Living. (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/ 2050827?NCID=aolcmp00300000002598)
The optimal waveform for an AC motor's coils depends on both how the
windings are positioned, and how the iron is shaped. The easiest way to
see the optimal waveform for a given motor is to spin it as a generator,
and look at the waveform it generates.
Let's say you have a 2-pole motor. As you go in a circle around the air
gap between rotor and stator, the magnetic field produced by the rotor
magnets is all North poles for half of the circle, and all South poles
for the other half. If we "unwrap" these poles and lay them
horizontally, you get something like
NNN...SSS... (one complete revolution)
As they rotate, these magnetic poles pass each wire in the stator once
per revolution. Passing the North pole raises the voltage; passing the
South pole lowers the voltage. Passing the gaps leaves the voltage constant.
If the strength of the magnetic field is the same across the pole faces,
and the width of the gaps between poles is the same as the with of the
poles themselves, then you get this kind of waveform.
___
/ \ /
/ \ /
/ \___/
This is called a trapezoidal waveform.
To make it more square, you make the poles very narrow and the gaps
between the very wide. This waveform is easy for the electronics to
produce, but hard on the motor because all the magnetic flux is
(Continue reading)
Deal. Cor van de Water Systems Architect Proxim Wireless Corporation http://www.proxim.com Email: CWater@... Private: http://www.cvandewater.com Skype: cor_van_de_water IM: cor_van_de_water@... Tel: +1 408 542 5225 VoIP: +31 20 3987567 FWD# 25925 Fax: +1 408 731 3675 eFAX: +31-87-784-1130 Second Life: www.secondlife.com/?u=3b42cb3f4ae249319edb487991c30acb -----Original Message----- From: jorg.brown@... [mailto:jorg.brown@...] On Behalf Of Jorg Brown Sent: Friday, February 29, 2008 11:24 AM To: Cor van de Water Cc: Electric Vehicle Discussion List Subject: Gas won't be $10/gal. any time soon (the bet) [Changing the name of the thread to more accurately reflect the discussion] On Sat, Feb 23, 2008 at 7:14 PM, Cor van de Water <CWater@...> wrote: > Hi Jorg, > > The issue with the Simon/Ehrlich bet was that Ehrlich forgot the > "substitution" effect, where many of the materials that were becoming > scarce were replaced with new developments, such as fiber replacing > copper wires. I disagree. I think Ehrlich believed, as do most people, that the substitution effect would only work so(Continue reading)
6061 t6 is the usual motorhead choice, but ask a machine shop... http://www.jjjtrain.com/vms/eng_metalsl_hist/eng_metal_hist_06.html google "properties aluminum alloys" Tom Parker wrote: > I'm about to buy aluminium to make my adapter plate. What grade should I > get? From Mico Metals (in Auckland New Zealand) I can get 5083 (10, 12mm > or thicker) or 5454 (only 10mm thick is available). Would one of these > be suitable or should I look elsewhere?
Morgan LaMoore wrote: > But brushless DC motors require a 3 phase controller, so they won't > work with a Zilla. Sort of... This particular brushless motor has a built-in controller, so it will run on plain DC. The real problem is that the Zilla doesn't produce plain DC. It is a PWM controller, whose output switches rapidly back and forth between 0 and full pack voltage. For example, half throttle with a 100v pack produces 0v 100v 0v 100v... at a 50/50 duty cycle. A series motor or light bulb behaves as if you are applying 50v. But the electronics in a brushless DC motor that would have run at 50v will be destroyed by the 100v peaks. You could build a filter to convert the Zilla's PWM into plain DC. It requires a big inductor and big filter capacitor. But these parts would be about as big as the brushless DC motor. -- -- Ring the bells that still can ring Forget the perfect offering There is a crack in everything That's how the light gets in -- Leonard Cohen -- Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net
Hello Dave, A good torque wrench should be tested about every 3 months when use on very critical items. These are normally sent to a testing lab which will be tested for for the corrected readings in a plus or minus range. A inspection label should be attach to the torque wrench showing the specifications. Another way you can do it for not so critical work, is to compare the torque wrench with a good dial indicator torque wrench by tightening a nut on a bolt that is in a vise, to see if a click type torque wrench will be in the range of the dial indicator type. Sometimes, I take mind torque wrenches to a friend of mine that has a machine shop that has to do this critical torque work, and compare my torque wrench to there master torque wrench. Also, the springs in a click type torque wrench may be worn out and must be replace once in a while. If the torque wrench is a Snap On type, then contact Snap On for replacement. What also weakens the torque wrench springs is leaving it in storage with the torque wrench Lock On and not storing it in a approved case. Roland ----- Original Message ----- From: <DOCTORDHD@...> To: <ev@...> Sent: Friday, February 29, 2008 5:15 PM(Continue reading)
People have been discussing the S-10 on e-bay. From what I know, it takes the batteries in this link. http://panasonic.co.jp/mbi/psb/products/en/ev_lead/fv1260.html At least those are the batteries that were in the EV-1 and S-10's I am familiar with. They look identical to the ones we removed from some S-10's (1999 vintage). I have no idea how to get them in the US, but if anyone does know, please let me know. We also have one of these here with dead batteries and can't find any new replacements. So, the truck sits and has been sitting for about 3 years now. There is also a second one sitting around here that also has dead batteries. Neither of them are mine, but I was trying to get one of them running late last year with no success (couldn't find any good batteries, only more dead used ones which I now have a lot of). All of the batteries were taken out of other S-10's of the same vintage and were just as bad. So, I hope someone has successfully imported these batteries from Japan or knows how to. Steve ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs(Continue reading)
I have never seen an E-Bay auction writen so poorly. I would be very cautious about this auction for just thst reason. Joe Josh and Jenifer wrote: > > has anyone seen this? > > http://cgi.ebay.com/ebaymotors/Chevrolet-S-10-1998-Chevrolet-S-10-ELECTRIC-VEHICLE-W-9-995-miles_W0QQcmdZViewItemQQcategoryZ13488QQihZ010QQitemZ200203717462QQrdZ1QQsspagenameZWDVW > _______________________________________________ > For subscription options, see > http://lists.sjsu.edu/mailman/listinfo/ev > > -- -- View this message in context: http://www.nabble.com/s-10-on-ebay-tp15752237p15769053.html Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com.
It all depend whether it's a new $20 torque wrench (not good) or a used MilSpec $150 torque wrench that hasn't been abused. You pay your money ... You take your chances. I have bought four torque wrenches through eBay to use on my helicopter. Three were junk. Caviet Emptor Roger Daisley Pullman, WA http://www.96-volt.com -----Original Message----- From: DOCTORDHD@... [mailto:DOCTORDHD@...] Sent: Friday, February 29, 2008 4:16 PM To: ev@... Subject: [EVDL] Torque Wrench Any ideas as to whether a $20 1/4" drive torque wrench from eBay will be accurate enough for the 120 - 180 inch - pounds that Deka recommends for the 9A31 battery studs? Thank you, Dave Delman 1981 Electric DeLorean Project electricdelorean.com(Continue reading)
Why would someone not be honest, just because his primary language is not English? (Check his name) Cor van de Water Systems Architect Proxim Wireless Corporation http://www.proxim.com Email: CWater@... Private: http://www.cvandewater.com Skype: cor_van_de_water IM: cor_van_de_water@... Tel: +1 408 542 5225 VoIP: +31 20 3987567 FWD# 25925 Fax: +1 408 731 3675 eFAX: +31-87-784-1130 Second Life: www.secondlife.com/?u=3b42cb3f4ae249319edb487991c30acb -----Original Message----- From: ev-bounces@... [mailto:ev-bounces@...] On Behalf Of autoquant Sent: Friday, February 29, 2008 5:59 PM To: ev@... Subject: Re: [EVDL] s-10 on ebay I have never seen an E-Bay auction writen so poorly. I would be very cautious about this auction for just thst reason. Joe Josh and Jenifer wrote: > > has anyone seen this? > > http://cgi.ebay.com/ebaymotors/Chevrolet-S-10-1998-Chevrolet-S-10-ELEC(Continue reading)
RSS Feed228 | |
|---|---|
416 | |
448 | |
474 | |
520 | |
87 | |
383 | |
603 | |
531 | |
542 | |
528 | |
819 | |
865 | |
850 | |
649 | |
843 | |
562 | |
703 | |
764 | |
1136 | |
823 | |
922 | |
796 | |
754 | |
1072 | |
1017 | |
801 | |
691 | |
735 | |
817 | |
853 | |
898 | |
1032 | |
755 | |
785 | |
1350 | |
899 | |
945 | |
884 | |
895 | |
778 | |
1038 | |
868 | |
882 | |
998 | |
1060 | |
1029 | |
1300 | |
1297 | |
1406 | |
1847 | |
1782 | |
1630 | |
1243 | |
1208 | |
1437 | |
1627 | |
2056 | |
3050 | |
2554 | |
2422 | |
2241 | |
2611 | |
1889 | |
2693 | |
2788 | |
2360 | |
2197 | |
1870 | |
2472 | |
2771 | |
3176 | |
2392 | |
2112 | |
5 |
