Wiki Questions/Suggestions - DIY Electric Car Forums
Go Back  

DIY Electric Car Forums > DIY EV Wiki > DIY Wiki Discussion

Register Blogs FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 12-02-2007, 10:34 PM
mattW's Avatar
mattW mattW is offline
Super Moderator
 
Join Date: Sep 2007
Location: Sydney, Australia
Posts: 882
Blog Entries: 18
mattW is a glorious beacon of lightmattW is a glorious beacon of lightmattW is a glorious beacon of lightmattW is a glorious beacon of lightmattW is a glorious beacon of light
Default Wiki Questions/Suggestions

If you have any doubts about what should go in the wiki, or wish to ask for some verification before putting something in then here is the place to do it. If you are a little bit uncertain about how to add to the wiki then feel free to leave suggestions for content that others could add to. Also if anyone feels as though changes should be made to the way the wiki topics are structured then suggest it here also.
Cheers!
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 12-17-2007, 08:14 AM
rbgrn's Avatar
rbgrn rbgrn is offline
Administrator
 
Join Date: Jul 2007
Posts: 705
Blog Entries: 13
rbgrn has disabled reputation
Default Re: Wiki Questions/Suggestions

Wow, I'm really impressed with what you've been doing with this!! I like the tutorial Introduction to the EV Wiki
Reply With Quote
  #3  
Old 03-21-2008, 09:18 PM
Coley Coley is offline
Senior Member
 
Join Date: Jul 2007
Posts: 1,353
Blog Entries: 1
Coley is on a distinguished road
Default Re: Wiki Questions/Suggestions

For those of us that don't use a tachometer on their EVs, could you post a formula for figuring RPMs, off of the gear ratios at these speeds of the car?

I have been working on it and I think this is it.

My 13" tires turn 946 rpms in one mile. They go 5.58' in one turn.

The motor is rated @ 3000 rpm.

Final drive ratios-------------Actual road speeds, that I run in these gears.

1st gear 15.000-------------10 mph (not very often)
2nd gear 8.250--------------25 mph
3rd gear 6.500--------------38 mph
4th gear 4.000--------------45 mph
5th gear 3.250--------------48/50 mph (just under 200 amp draw)

Using 2800 rpms for motor speed, I worked this up.

Motor rpm in each gear @ road speed.

1st gear @ 11.84 mph is 2800 rpm
2nd gear @ 21.53 mph is 2800 rpm
3rd gear @ 27.33 mph is 2800 rpm
4th gear @ 44.41 mph is 2800 rpm
5th gear @ 54.66 mph is 2800 rpm

MPH Formula is what I used. This will get you close.

RPM divided by final gear ratio 2800 divided by 3.25 = 861.54 (5th gear used)
X tire circumfenrence 76 X = 57723.07
X 60 57723.07 X 60 =3463385
divided by 12 3463385 =288615.37
divided by 5280 288615.37 div 5280 =54.66 mph

To figure RPM just change the gear ratio.

Last edited by Coley; 03-27-2008 at 12:00 PM. Reason: added info
Reply With Quote
  #4  
Old 03-29-2008, 12:13 PM
Coley Coley is offline
Senior Member
 
Join Date: Jul 2007
Posts: 1,353
Blog Entries: 1
Coley is on a distinguished road
Default Re: Wiki Questions/Suggestions

When you put the MPH formula into a spreadsheet, you can do any speed and gear ratio.
This really dials it in for each gear.
Reply With Quote
  #5  
Old 02-10-2011, 03:28 AM
_tui_ _tui_ is offline
Junior Member
 
Join Date: Sep 2010
Location: Auckland, New Zealand
Posts: 3
_tui_ is on a distinguished road
Default Re: Wiki Questions/Suggestions

Acronyms:

Hi all, I'm a newbie and noticed there are a few acronyms floating about.
It'd be great to have a bunch listed somewhere as a quick reference, something that'll come up in a search at least.
The acronyms I'm unsure of are CV (constant voltage?), DoD (depth of discharge?) and AWG, to name a few.
I'll probably post something up eventually once I've educated and orientated myself a bit more (unless someone beats me to it).
Reply With Quote
  #6  
Old 04-05-2011, 01:47 AM
ZX-E's Avatar
ZX-E ZX-E is offline
Senior Member
 
Join Date: Aug 2009
Location: Seattle
Posts: 114
ZX-E is on a distinguished road
Default Re: Wiki Questions/Suggestions

Quote:
Originally Posted by _tui_ View Post
Acronyms:

Hi all, I'm a newbie and noticed there are a few acronyms floating about.
It'd be great to have a bunch listed somewhere as a quick reference, something that'll come up in a search at least.
The acronyms I'm unsure of are CV (constant voltage?), DoD (depth of discharge?) and AWG, to name a few.
I'll probably post something up eventually once I've educated and orientated myself a bit more (unless someone beats me to it).
Yep, CV is constant voltage when referring to electronics, or constant velocity when referring to a CV joint. DoD is the depth of discharge and AWG stands for the American Wire Gauge .

Having a list of acronyms added to the nuwiki would definitely be useful.
__________________
-Rich
Reply With Quote
  #7  
Old 01-28-2012, 07:49 AM
HYPRDRV HYPRDRV is offline
Member
 
Join Date: Aug 2009
Location: Virginia
Posts: 38
HYPRDRV is on a distinguished road
Default Re: Wiki Questions/Suggestions

It would be nice to see a battery PACK wiring diagram for both Lead Acid and the LiPo packs. I can help, if someone wants to give me a hand drawn diagram I'll put it into a CAD program and post it as a PDF.

Steve
Reply With Quote
Reply

Share or Bookmark this

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

 
Support DIY Electric Car
Sponsors

All times are GMT -6. The time now is 06:05 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Ad Management by RedTyger