Re: EV digest 2188

[keith bierman <Keith.Bierman@Sun.COM>]

> Date: 
>                         Wed, 31 Jul 2002 11:04:36 -0700
>                    From: 
>                         Roger Daisley <roger@daisley.com>
>                  Subject: 
>                         Lead foot driver causes Curtis 1221C to complain
>                      To: 
>                         ev@listproc.sjsu.edu
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> 
> 
> I recently acquired a VoltsRabbit running a Curtis 1221C, Prestolite motor
> and 128-volts of flooded batteries.
> 
> On warm Southern California days, after about 5-6 miles, the controller will
> abruptly cut back on current flow and start to squeal at certain throttle
> positions.  I assume its overheating.  The controller and aluminum plate
> it's mounted on (Electro Automotive design) is quite hot to the touch.  I
> don't drive it very conservatively, as all my trips are short range.  Amp
> pulls in the 200-300 range are common.  (Yes, I know: The cheapest is to get
> off the throttle, but that's not what I want to do. <smile>)
> 
> Ideas that cross my mind are:
> 
> Find a way for more air flow across the assy, but that seems problematic as
> to "fixing" the problem.
> 
> Add cooling area or increased heat sink.
> 
> Some method of extracting the heat from the controller.
> 
> Slow down. REJECTED <smile>
> 
> With the combined expertise on this board, surely someone has encountered
> the problem and solved it.

Pretend it's a small supercomputer (e.g. a fluronert cooled cray).
get a fishtank and fill it with HFE (generic, you'd need to chat
with 3M and find a formulaton which would be best), float the
controller in the tank. You may need to circulate the coolant
through a radiator.

More expensive than water, but way more exciting. Also, I'd bet it
would keep the components more consistently cooler.

The more "traditional" ev technique would be to run water through
the heat sink, and have a radiator, a pump, etc.


-- 
Keith H. Bierman    keith.bierman@Sun.COM| 650-352-4432 voice+fax
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            <speaking for myself, not Sun*> Copyright 2002