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Discussion Starter #1
Ok I had SOME POWER Failures here and I lost a lot of information.. The
thing I am looking for is the site that sells knock off Curtis controllers..

If somebody would be so kind to get that for me thanks..
Mitchell

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Discussion Starter #2
[EVDL] controller

My VW Bug conversion is completed with the exception of the controller whic=
h I have been waiting for since April. Is there any way I can run this c=
ar temporarily without a controller.
20 6v flooded lead acid batteries and warp 9 motor.

Alan


=

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Discussion Starter #3
Re: [EVDL] controller

Alan Shaw wrote:
> My VW Bug conversion is completed with the exception of the
> controller which I have been waiting for since April. Is there any
> way I can run this car temporarily without a controller. 20 6v
> flooded lead acid batteries and warp 9 motor.

Yes. You may be able to borrow a controller until yours arrive. Or, you
can use a few contactors to make a simple contactor controller to use.
You almost certainly have at least one contactor anyway, so you just
need two more to make a 3-step controller.

Keep the faith. I believe you are waiting for your Zilla? It took about
6 months to get mine as well, but it was worth the wait!
--
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

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Discussion Starter #4
Re: [EVDL] controller

Lee,

Speaking of waiting... any progress on the charger?

Rush
Tucson, AZ
2000 Insight, 62lmpg, #4965
www.ironandwood.org
www.Airphibian.com
www.TEVA2.com


----- Original Message -----
From: "Lee Hart" <[email protected]>
To: <[email protected]>; "Electric Vehicle Discussion List"
<[email protected]>
Sent: Sunday, December 07, 2008 12:56 PM
Subject: Re: [EVDL] controller


> Alan Shaw wrote:
>> My VW Bug conversion is completed with the exception of the
>> controller which I have been waiting for since April. Is there any
>> way I can run this car temporarily without a controller. 20 6v
>> flooded lead acid batteries and warp 9 motor.
>
> Yes. You may be able to borrow a controller until yours arrive. Or, you
> can use a few contactors to make a simple contactor controller to use.
> You almost certainly have at least one contactor anyway, so you just
> need two more to make a 3-step controller.
>
> Keep the faith. I believe you are waiting for your Zilla? It took about
> 6 months to get mine as well, but it was worth the wait!
> --
> 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
>
> _______________________________________________
> General EVDL support: http://evdl.org/help/
> Usage guidelines: http://evdl.org/help/index.html#conv
> Archives: http://evdl.org/archive/
> Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
>


--------------------------------------------------------------------------------



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Checked by AVG - http://www.avg.com
Version: 8.0.176 / Virus Database: 270.9.15/1834 - Release Date: 12/6/2008
4:55 PM

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Discussion Starter #5
Re: [EVDL] controller

>
> My VW Bug conversion is completed with the exception of the controller which I have been waiting for since April. Is there any way I can run this car temporarily without a controller.
> 20 6v flooded lead acid batteries and warp 9 motor.
>
> Alan
>
>
>
>
Maybe, but even that may not be cheap.
Make a contactor controller.
This means you would cable the batteries to contactors to allow 5 inn
series 4 parallel for 30V then 10 series 2 parallel for 60V and 20 in
series for 120V
In series with this is a big resistor.

The trick here is to use the resistance in such a way to minimize the
amps and to use adequate contactors(this is where the cost lies).

I once thaought it might be interesting to make a "hot box transmission"
where the clutch would give the human enough leverage to overcome a
spring loaded contactor and the shift lever moves configuration plates
for all the series parrallel combinations. This idea still may have
merit for lowering the cost of a contactor controller down to one big
single pole contactor and a slider switch shifter, just disconnect the
power, shift, and reapply the power, the gas pedal is tied to the
resistor part of the circuit and the off throttle switch disengages the
contactor.

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Discussion Starter #6
Re: [EVDL] controller

Alan asked:
> My VW Bug conversion is completed with the exception of
> the controller which I have been waiting for since April.
> Is there any way I can run this car temporarily without a
> controller. 20 6v flooded lead acid batteries and warp 9 motor.

Sure, you may use the layout that some use for "Turbo",
a bypass-contactor that connects the motor directly to the
batteries once the potbox hits "pedal to the metal".
You can even keep this configuration after you installed
your controller, just in case it ever does not work, you
still have an emergency way of moving the vehicle.
NOTE that using this bypass-contactor is hard on the
contactor and it is not an efficient way of driving at
lower speeds, nor is it comfortable, but for an emergency
it is a great insurance policy.
Also note that since you should have a normal main contactor
AND a bypass-contactor, that you get to keep all safety
against a welded contact in the bypass-contactor, because
the main contactor (which only opens and closes at no load)
will be able to break the circuit. This is important!

There are many ways to make the drive more smooth than
the crude on/off control, see the many schematics for
contactor controllers with intermediate voltages and
even with a series resistor (piece of stainless rod) to
reduce the current surge (and resulting acceleration)
when you first engage a new "gear" (voltage level).
See the EVDL archives.
But now you are approaching the cost and complexity of
installing a controller, so I think that the emergency
setup of a single bypass-contactor and a microswitch
in the potbox signalling "pedal down" may be all you need.
If doing it fancy, add another microswitch for a second
contactor, at a potbox level just before the last stop,
to first switch the resistor between battery and motor,
before shorting motor directly to the batteries.
NOTE: resistor will get hot if used for more than a
few seconds, but since it mainly serves to avoid the
initial jolt of full-power from standstill, it should
typically not be used much, you should drive it as if
you only had the on/off control that I see many drivers
use these days....

Again - this is not going to be good for range, but it
is a great way to build some security into your car
that you can move it out of the way as long as your
batteries have charge and your motor still works...

Success,

Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040) 23117400x109 XoIP: +31877841130

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