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Today's Topics:
1. Re: bad boy charger with a variac (mike golub)
2. Re: Air Springs (mike golub)
3. Re: bad boy charger with a variac (Lawrence Rhodes)
4. Re: twin, different motors? (MIKE WILLMON)
5. Re: Body-on-Frame (MIKE WILLMON)
6. Re: 2007 NEDRA Nationals raffle motor pictures (MIKE WILLMON)
7. Re: twin, different motors? (Marty Hewes)
8. Re: Body-on-Frame (Jack Murray)
----------------------------------------------------------------------
Message: 1
Date: Wed, 15 Aug 2007 09:45:42 -0700 (PDT)
From: mike golub <[EMAIL PROTECTED]>
Subject: Re: [EVDL] bad boy charger with a variac
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=iso-8859-1
Yes that tapped transformer would act as "bonn"
inductor. I'll make it out of an old microwave
transformer. I cut out all the old wires, and then add
new ones. Last time I use 12 gauge, but I guess I can
use smaller wire, because the "E" and "I" plates
absorb the current?
But was I correct that this inductor should go before
the variac, on the black 120vac wire?
You might be suggesting that the tapped transformer is
not
being used as
a transformer, but rather as a tapped series inductor.
It
has much the
same purpose as the series capacitor -- it acts as a
lossless dropping
"resistor" to limit the peak charging current or
voltage.
--- Lee Hart <[EMAIL PROTECTED]> wrote:
> mike golub wrote:
> > I've used a bad boy charger with my 120 volt
> system. Now I'm working
> > on a 72 volt bank...
> >
> > black wire to a transformer with taps...
> > black and white to huge variac transformer...
> > variac output to bridge [rectifier]...
> > perhaps a 5uF cap in series...
> > ---------------------------
> > Do I have the tapped transformer in the right
> spot?
>
> A variac itself is a tapped transformer, so you
> don't really need both a
> variac and a separate tapped transformer. Your
> charger could just be the
> variac, with a bridge rectifier on its output, and
> whatever meters,
> fuses, fan, timer, etc. you want to be comfortable
> using it.
>
> There are several ways a capacitor might be used.
> You can put a big AC
> rated capacitor directly across the AC input; it
> acts as a power factor
> corrector, to reduce the AC input current for a
> given DC output current.
> Or, you can put a DC rated capacitor across the
> output; it acts as a
> filter to reduce the ripple current in the
> batteries. Or, you can put a
> very big AC rated capacitor in series with the AC
> input, to act as a
> lossless dropping "resistor".
>
> You might be suggesting that the tapped transformer
> is not being used as
> a transformer, but rather as a tapped series
> inductor. It has much the
> same purpose as the series capacitor -- it acts as a
> lossless dropping
> "resistor" to limit the peak charging current or
> voltage.
>
> --
> 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
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
------------------------------
Message: 2
Date: Wed, 15 Aug 2007 09:47:40 -0700 (PDT)
From: mike golub <[EMAIL PROTECTED]>
Subject: Re: [EVDL] Air Springs
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=iso-8859-1
will he give us a good price?
--- Jeff Shanab <[EMAIL PROTECTED]> wrote:
> Yup. I used to work for a plastics manufacturer who
> closed their doors
> to go full time into the air bag buisness. I have
> watched the testing
> and helped cut up bags and can say without a doubt,
> these guys have a
> great air bag.
>
> http://www.slamspecialties.com/
>
> When you talk to Nick, you are talking to the
> original owner of the 300Z
> that I converted.
>
> This sounds like an endorsement,but really it is
> just facts. They are
> designed in such a way that they don't expand in
> diameter when inflated
> and don't come apart if inflated without being
> constrained. They also
> use a special process(not sure if I should say
> more), that prevents leaks.
>
> The bags are stiff enough to act as the dampening,
> often times where
> shocks went through center of spring, guys get away
> with leaving the
> shocks off.
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
------------------------------
Message: 3
Date: Wed, 15 Aug 2007 09:52:28 -0700
From: "Lawrence Rhodes" <[EMAIL PROTECTED]>
Subject: Re: [EVDL] bad boy charger with a variac
To: <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="iso-8859-1"
I've been using a bridge & variac for years as a charger. Is there any
problem with ripple? Do I really need to put a capacitor in to smooth it
out? Lawrence Rhodes....
------------------------------
Message: 4
Date: Wed, 15 Aug 2007 09:28:10 -0800
From: MIKE WILLMON <[EMAIL PROTECTED]>
Subject: Re: [EVDL] twin, different motors?
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii
The problem I can think of right away is that once the 8" motor gets up into
its "power band" as you put it you could be well past the redline of the bigger
motor. It would probably be best for both motors that they share load equally
at all power and RPM levels. If you want the torque of an 8" and 11" in
combination why not go with two 9" motors. In my rough figuring two 6.7"s
equal a 9", two 8"s equal an 11" and two 9"s equal a13" for torque. The
benefit for the two smaller motors is the higher RPM limits and the ability to
affect a series/parallel shift point.
My two motors worth,
Mike
Anchorage, Ak.
----- Original Message -----
From: Marty Hewes <[EMAIL PROTECTED]>
Date: Wednesday, August 15, 2007 7:46 am
Subject: [EVDL] twin, different motors?
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
> OK math wizards, is there something here, or am I off base. This
> looks like
> calculus, at which I am impaired, too ADHD.
>
> What happens if you couple a smaller motor to the back of a bigger
> motor and
> parallel them (electrically).
>
> I'm thinking the big motor might suck up most the current and
> produce
> tremendous torque at low RPM, then when the big motor's back EMF is
> taking
> it down as RPM rises, the little motor is getting into it's power
> band?
> Might this combination make for a broader power band and reduce the
> need for
> a transmission or series parallel switching? Another advantage
> might be that
> the output shaft size of the small motor may be the same size as
> the small
> shaft end of the big motor, and couplers may survive better as the
> big end
> of the big motor isn't being asked to handle twice the torque it
> was
> designed to.
>
> I'm thinking ADC 11 and ADC 8 for example.
>
> Comments?
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
------------------------------
Message: 5
Date: Wed, 15 Aug 2007 09:31:07 -0800
From: MIKE WILLMON <[EMAIL PROTECTED]>
Subject: Re: [EVDL] Body-on-Frame
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii
Along that same line does anyone know of a cool looking sports car body (or
kit) that would bolt onto a small truck frame like for an S-10 with minimal
modifications?
Mike,
Anchorage, Ak.
----- Original Message -----
From: Zeke Yewdall <[EMAIL PROTECTED]>
Date: Wednesday, August 15, 2007 8:31 am
Subject: Re: [EVDL] Body-on-Frame
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
> Yeah. People doing hotrodding swap cabs onto different frames all the
> time -- just have to weld the brakets in the right place for the bolts
> from the cab... and get everything to align properly.
>
> On 8/15/07, Dewey, Jody R ATC COMNAVAIRLANT, N422G5G
> <[EMAIL PROTECTED]> wrote:
> > It is bolted on. There are roughly 4 bolts that run to brackets
> welded> to the frame.
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:ev-
> [EMAIL PROTECTED] On
> > Behalf Of Bill Dennis
> > Sent: Wednesday, August 15, 2007 11:33
> > To: Electric Vehicle Discussion List
> > Subject: [EVDL] Body-on-Frame
> >
> > In body-on-frame construction for pickups like a Ford Ranger, how
> is the
> > cab attached to the frame? Is it welded on, bolted on, etc.? Is it
> > something you could pickup at a junkyard, bring home and bolt onto
> > another chassis?
> >
> > Thanks.
> >
> > Bill Dennis
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
------------------------------
Message: 6
Date: Wed, 15 Aug 2007 09:40:30 -0800
From: MIKE WILLMON <[EMAIL PROTECTED]>
Subject: Re: [EVDL] 2007 NEDRA Nationals raffle motor pictures
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii
Hey, thats what I'm going to do with my WarP9 Twins.....screw the Pinto Project
I need art work for my mantle, and these babies fit the bill ;-P
----- Original Message -----
From: Rod Hower wrote:
> ... Besides, I just may mount it on the mantel as
> a 'Jim Husted masterpiece', kind of like a Picasso?
> Thanks,
> Rod
------------------------------
Message: 7
Date: Wed, 15 Aug 2007 12:53:02 -0500
From: "Marty Hewes" <[EMAIL PROTECTED]>
Subject: Re: [EVDL] twin, different motors?
To: "Electric Vehicle Discussion List" <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
My thought was to better emulate the wide power band of an AC motor. A
large DC motor pulls well at low RPM, but has too much back EMF at higher
RPM to draw much current and generate HP unless a high voltage pack is used.
The smaller motor isn't as torquey at low RPM, but comes on stronger at high
RPM due to less back EMF. I'm thinking a 6.7" coupled to a 9" might produce
the same power as twin 8's, but with a broader power band and less stress on
the small shaft end of the bigger motor. Might be cheaper also, I seem to
remember 8" and 9" being similar in price, but the 6.7" is significantly
cheaper. I also wonder about the red line on the bigger motor though.
Guess I'll have to get out the curves and graph paper.
Marty
----- Original Message -----
From: "MIKE WILLMON" <[EMAIL PROTECTED]>
To: "Electric Vehicle Discussion List" <ev@lists.sjsu.edu>
Sent: Wednesday, August 15, 2007 12:28 PM
Subject: Re: [EVDL] twin, different motors?
> The problem I can think of right away is that once the 8" motor gets up
> into its "power band" as you put it you could be well past the redline of
> the bigger motor. It would probably be best for both motors that they
> share load equally at all power and RPM levels. If you want the torque of
> an 8" and 11" in combination why not go with two 9" motors. In my rough
> figuring two 6.7"s equal a 9", two 8"s equal an 11" and two 9"s equal
> a13" for torque. The benefit for the two smaller motors is the higher RPM
> limits and the ability to affect a series/parallel shift point.
>
> My two motors worth,
>
> Mike
> Anchorage, Ak.
>
> ----- Original Message -----
> From: Marty Hewes <[EMAIL PROTECTED]>
> Date: Wednesday, August 15, 2007 7:46 am
> Subject: [EVDL] twin, different motors?
> To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
>
>> OK math wizards, is there something here, or am I off base. This
>> looks like
>> calculus, at which I am impaired, too ADHD.
>>
>> What happens if you couple a smaller motor to the back of a bigger
>> motor and
>> parallel them (electrically).
>>
>> I'm thinking the big motor might suck up most the current and
>> produce
>> tremendous torque at low RPM, then when the big motor's back EMF is
>> taking
>> it down as RPM rises, the little motor is getting into it's power
>> band?
>> Might this combination make for a broader power band and reduce the
>> need for
>> a transmission or series parallel switching? Another advantage
>> might be that
>> the output shaft size of the small motor may be the same size as
>> the small
>> shaft end of the big motor, and couplers may survive better as the
>> big end
>> of the big motor isn't being asked to handle twice the torque it
>> was
>> designed to.
>>
>> I'm thinking ADC 11 and ADC 8 for example.
>>
>> Comments?
>>
>> _______________________________________________
>> For subscription options, see
>> http://lists.sjsu.edu/mailman/listinfo/ev
>>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
>
------------------------------
Message: 8
Date: Wed, 15 Aug 2007 11:22:56 -0700
From: Jack Murray <[EMAIL PROTECTED]>
Subject: Re: [EVDL] Body-on-Frame
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii; format=flowed
There is a company that sells a hotrod S10 kit that uses the S10 cab,
and replaces the rest of the body with a '40 ford style look.
here it is:
http://www.rodster.com/
may or maynot be what you like..
Jack
MIKE WILLMON wrote:
> Along that same line does anyone know of a cool looking sports car body (or
> kit) that would bolt onto a small truck frame like for an S-10 with minimal
> modifications?
>
> Mike,
> Anchorage, Ak.
>
> ----- Original Message -----
> From: Zeke Yewdall <[EMAIL PROTECTED]>
> Date: Wednesday, August 15, 2007 8:31 am
> Subject: Re: [EVDL] Body-on-Frame
> To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
>
>>Yeah. People doing hotrodding swap cabs onto different frames all the
>>time -- just have to weld the brakets in the right place for the bolts
>>from the cab... and get everything to align properly.
>>
>>On 8/15/07, Dewey, Jody R ATC COMNAVAIRLANT, N422G5G
>><[EMAIL PROTECTED]> wrote:
>>
>>>It is bolted on. There are roughly 4 bolts that run to brackets
>>
>>welded> to the frame.
>>
>>>-----Original Message-----
>>>From: [EMAIL PROTECTED] [mailto:ev-
>>
>>[EMAIL PROTECTED] On
>>
>>>Behalf Of Bill Dennis
>>>Sent: Wednesday, August 15, 2007 11:33
>>>To: Electric Vehicle Discussion List
>>>Subject: [EVDL] Body-on-Frame
>>>
>>>In body-on-frame construction for pickups like a Ford Ranger, how
>>
>>is the
>>
>>>cab attached to the frame? Is it welded on, bolted on, etc.? Is it
>>>something you could pickup at a junkyard, bring home and bolt onto
>>>another chassis?
>>>
>>>Thanks.
>>>
>>>Bill Dennis
>>>
>>>_______________________________________________
>>>For subscription options, see
>>>http://lists.sjsu.edu/mailman/listinfo/ev
>>>
>>>_______________________________________________
>>>For subscription options, see
>>>http://lists.sjsu.edu/mailman/listinfo/ev
>>>
>>
>>_______________________________________________
>>For subscription options, see
>>http://lists.sjsu.edu/mailman/listinfo/ev
>>
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
------------------------------
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End of EV Digest, Vol 1, Issue 40
*********************************
