Re: Batteries - EV Conversion

Liste des GroupesRevenir à rc metalworking 
Sujet : Re: Batteries - EV Conversion
De : bp (at) *nospam* www.zefox.net
Groupes : rec.crafts.metalworking
Date : 02. Mar 2025, 16:02:15
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vq1rtn$qrsg$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12
User-Agent : tin/2.6.4-20241224 ("Helmsdale") (FreeBSD/14.2-STABLE (arm64))
Bob La Londe <none@none.com99> wrote:
On 3/1/2025 5:52 PM, bp@www.zefox.net wrote:
EVs benefit from a shiftable transmission exactly the way IC vehicles
do. The transmission minimizes current draw when torque is needed and
minimizes voltage required when speed is needed. Their omission is a
matter of cost control, not design optimization. The only thing they
don't need is a clutch. The current minimzation is especially important,
because electrical efficiency is inversely proportional to the square
of the current draw.
 
You are right of course.  Maybe not exactly, but the principal is
certainly still true.  I would not be a fan of dropping an EV motor in
front of a Dodge automatic transmission.  I'm not even sure it would
operate without being hooked to the Dodge computer.
 

Somebody would have to cook up a "PCM simulator" to generate the
signals (likely digital) needed by the transmission. Not a trivial
project in itself. But, it would increase low-speed acceleration
by an amount roughly equal to the gear ratios for a given battery
power. IIRC older Dodge 46RH and RE used a 2.45:1 low gear, which
would certainly be a noticeable improvement off the line. The torque
converter could be kept locked at all times if desired, but it would
probably be simpler to let it unlock while shifting. 

As you observed elsewhere, batteries are a more fundamental problem.
At energy/power densities approaching hydrocarbon fuels they take on
the character of rocket propellants. There's no easy remedy for that
problem, which few people anticipated. I certainly didn't.

Thanks for a most entertaining discussion!

bob prohaska


Date Sujet#  Auteur
27 Feb 25 * Batteries - EV Conversion61Bob La Londe
27 Feb 25 +* Re: Batteries - EV Conversion48Bob La Londe
27 Feb 25 i+* Re: Batteries - EV Conversion46bp
27 Feb 25 ii`* Re: Batteries - EV Conversion45Bob La Londe
28 Feb 25 ii `* Re: Batteries - EV Conversion44bp
28 Feb 25 ii  `* Re: Batteries - EV Conversion43Bob La Londe
1 Mar 25 ii   `* Re: Batteries - EV Conversion42bp
1 Mar 25 ii    `* Re: Batteries - EV Conversion41Bob La Londe
1 Mar 25 ii     +* Re: Batteries - EV Conversion39bp
1 Mar 25 ii     i+* Re: Batteries - EV Conversion34Bob La Londe
2 Mar 25 ii     ii+* Re: Batteries - EV Conversion25bp
2 Mar 25 ii     iii+- Re: Batteries - EV Conversion1Bob La Londe
2 Mar 25 ii     iii`* Re: Batteries - EV Conversion23Bob La Londe
2 Mar 25 ii     iii +* Re: Batteries - EV Conversion21bp
2 Mar 25 ii     iii i+* Re: Batteries - EV Conversion3Jim Wilkins
2 Mar 25 ii     iii ii`* Re: Batteries - EV Conversion2bp
2 Mar 25 ii     iii ii `- Re: Batteries - EV Conversion1Jim Wilkins
3 Mar 25 ii     iii i`* Re: Batteries - EV Conversion17Bob La Londe
4 Mar 25 ii     iii i `* Re: Batteries - EV Conversion16bp
4 Mar 25 ii     iii i  `* Re: Batteries - EV Conversion15Bob La Londe
4 Mar 25 ii     iii i   +* Re: Batteries - EV Conversion8bp
5 Mar 25 ii     iii i   i`* Re: Batteries - EV Conversion7Jim Wilkins
5 Mar 25 ii     iii i   i `* Re: Batteries - EV Conversion6bp
5 Mar 25 ii     iii i   i  `* Re: Batteries - EV Conversion5Jim Wilkins
5 Mar 25 ii     iii i   i   `* Re: Batteries - EV Conversion4bp
5 Mar 25 ii     iii i   i    `* Re: Batteries - EV Conversion3Jim Wilkins
5 Mar 25 ii     iii i   i     `* Re: Batteries - EV Conversion2bp
7 Mar 25 ii     iii i   i      `- Re: Batteries - EV Conversion1Jim Wilkins
4 Mar 25 ii     iii i   `* Re: Batteries - EV Conversion6Jim Wilkins
4 Mar 25 ii     iii i    `* Re: Batteries - EV Conversion5Snag
4 Mar 25 ii     iii i     `* Re: Batteries - EV Conversion4bp
4 Mar 25 ii     iii i      +* Re: Batteries - EV Conversion2Snag
4 Mar 25 ii     iii i      i`- Re: Batteries - EV Conversion1bp
4 Mar 25 ii     iii i      `- Re: Batteries - EV Conversion1Jim Wilkins
6 Apr 25 ii     iii `- Re: Batteries - EV Conversion1Clare Snyder
2 Mar 25 ii     ii+* Re: Batteries - EV Conversion7Jim Wilkins
2 Mar 25 ii     iii+* Re: Batteries - EV Conversion5Jim Wilkins
2 Mar 25 ii     iiii+* Re: Batteries - EV Conversion2Jim Wilkins
2 Mar 25 ii     iiiii`- Re: Batteries - EV Conversion1Jim Wilkins
3 Mar 25 ii     iiii`* Re: Batteries - EV Conversion2Bob La Londe
3 Mar 25 ii     iiii `- Re: Batteries - EV Conversion1Jim Wilkins
3 Mar 25 ii     iii`- Re: Batteries - EV Conversion1Bob La Londe
3 Mar 25 ii     ii`- Re: Batteries - EV Conversion1Bob La Londe
1 Mar 25 ii     i`* Re: Batteries - EV Conversion4Jim Wilkins
1 Mar 25 ii     i `* Re: Batteries - EV Conversion3Bob La Londe
2 Mar 25 ii     i  +- Re: Batteries - EV Conversion1Bob La Londe
6 Apr 25 ii     i  `- Re: Batteries - EV Conversion1Clare Snyder
6 Apr 25 ii     `- Re: Batteries - EV Conversion1Clare Snyder
6 Apr 25 i`- Re: Batteries - EV Conversion1Clare Snyder
3 Mar 25 +- Re: Batteries - EV Conversion1Bob La Londe
6 Apr 25 +* Re: Batteries - EV Conversion10Clare Snyder
6 Apr 25 i`* Re: Batteries - EV Conversion9Jim Wilkins
6 Apr 25 i +* Re: Batteries - EV Conversion7Jim Wilkins
6 Apr 25 i i`* Re: Batteries - EV Conversion6Bob La Londe
6 Apr 25 i i +* Re: Batteries - EV Conversion2Bob La Londe
6 Apr 25 i i i`- Re: Batteries - EV Conversion1Jim Wilkins
6 Apr 25 i i `* Re: Batteries - EV Conversion3Jim Wilkins
6 Apr 25 i i  `* Re: Batteries - EV Conversion2Bob La Londe
7 Apr 25 i i   `- Re: Batteries - EV Conversion1Jim Wilkins
12 Apr 25 i `- Re: Batteries - EV Conversion1Jim Wilkins
6 Apr 25 `- Re: Batteries - EV Conversion1Bob La Londe

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