[rbgrn]

Wow, I'm really impressed with what you've been doing with this!! I like the tutorial Introduction to the EV Wiki

 

[Coley]

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.

 

[Coley]

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.

 

[_tui_]

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).

 

[ZX-E]

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.

 

[HYPRDRV]

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

 

[Electric cars]

Feel free to peek at First International, as we are the market leader of electric vehicles and famous for electric golf carts for sale.

 

[maxsava030]

General question: How does one get in touch with a wikipedia article editor who is clearly knowledgable about the article and is the person making all the most recent excellent changes? I have clicked on the HISTORY and identified the main editor but I have a question for them. What's the best way to go about bringing up the issue I have in question?

This is my first time in your sub so I do hope this is in line with the work you all do here.
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