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Discussion Starter #1
How large should a cooling blower be? Terms of CFM or watts would be
helpful. I would like to run the blower at pack voltage of 108 volts. I
do not have a DC to DC converter and would like to limit the draw on the
12 volt system. Would any of these blowers from Surplus Center Work?
https://www.surpluscenter.com/sort.asp?catname=electric&keyword=EBFA
How can you tell if they are universal AC / DC motors?
I am using a 9 inch 120 lbs compound wound motor. Brush temps now
reach 170f. Air could be blown in the brush end through the motor to
holes in the drive. Airflow would cover the brushes,coils and exit
behind the flywheel.

Thanks, Brad

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Discussion Starter #2
Hello Brad,

I use a blower motor that is similar to the ones at:

http//www.evsource.com/tis_blowers.php

I use the 12vdc 176 CFM on my GE-11 or Warp-11 and Warp-9 motors. Made a
curve adapter block that mounts on top of the brush cover which is either
held in place by steel tabs that go down the face of the motor and bolts to
the 5/15 inch bolts holes on the WarP-9 and WarP-11 motors or bolt directly
to the brush cover of the GE-11.

You can either mount the blower fan directly on the adapter on the motor or
run a air hose to the adapter.

On the 12vdc 176 CFM, I use a standard 6 inch air filter housing and filter
that I pick up at a auto parts store.

Roland


----- Original Message -----
From: "brad" <[email protected]>
To: <[email protected]>
Sent: Saturday, October 16, 2010 8:33 AM
Subject: [EVDL] Motor Cooling Blower


> How large should a cooling blower be? Terms of CFM or watts would be
> helpful. I would like to run the blower at pack voltage of 108 volts. I
> do not have a DC to DC converter and would like to limit the draw on the
> 12 volt system. Would any of these blowers from Surplus Center Work?
> https://www.surpluscenter.com/sort.asp?catname=electric&keyword=EBFA
> How can you tell if they are universal AC / DC motors?
> I am using a 9 inch 120 lbs compound wound motor. Brush temps now
> reach 170f. Air could be blown in the brush end through the motor to
> holes in the drive. Airflow would cover the brushes,coils and exit
> behind the flywheel.
>
> Thanks, Brad
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
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>

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Discussion Starter #3
Maybe a small shop vac unit with a universal AC motor could be run
from the pack. You could just use the top unit and run regular vac
hose from the blower side :)

Mike

Jeff Major <[email protected]> wrote:

>
>
> --- On Sat, 10/16/10, brad <[email protected]> wrote:
>> How large should a
>> cooling blower be?..... Brush temps now
>> reach 170f. Air could be blown in the brush end
>> through the motor to
>> holes in the drive. Airflow would cover the brushes,coils
>> and exit behind the flywheel.
>>
>> Thanks, Brad
>
> Hi Brad,
>
> First off, 170F degrees on the brushes ain't nothin' to worry
> about. Maybe 170C. But your brushes are barely warm ;-)
>
> Next, if you want to blow air in your car, use an automotive heater/
> air cond/ventilation motor. These are automotive quality and put
> out a good blast at 12 V. Don't know the CFM. But I have used
> these and they work well. The ones with a squirrel cage fan. Can
> be mounted with an air filter or in clean air intake and ducted to
> the coverband on the comm end of the motor. Then you got it right.
> Make the air exit the motor at the drive end near the tranny. If
> there are vent holes in that end of the motor, there may be an
> internal fan and this air flow would be in the same direction.
>
> Finding a 108V DC blower is unlikely. 110V AC blowers might work,
> but would not be underhood rated. Stick with the 12V blower and
> just turn it on when you need it. Maybe with a thermal clicks-on
> switch.
>
> Jeff M
>
>
>
>
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Discussion Starter #4
Brad wrote:
> How large should a cooling blower be? Terms of CFM or watts would be
> helpful.

It's likely to need on the order of 100 CFM or more. The real way to
tell is to measure the temperature of the air going in and out of the
motor, and use enough air to keep the temperature rise to something like
40 deg.F or less.

> I would like to run the blower at pack voltage of 108 volts. I
> do not have a DC to DC converter and would like to limit the draw on the
> 12 volt system. Would any of these blowers from Surplus Center Work?
> https://www.surpluscenter.com/sort.asp?catname=electric&keyword=EBFA

These are all AC only (xxx VAC). And, they are all propeller fans, not
blowers. A propeller fan move a large volume of air when its path is
unrestricted, but its airflow drops considerably in the presence of any
restrictions.

The path through a motor is very tight and twisty, so you need a blower
than can deliver much higher pressure. A squirrel cage or centrifugal
blower are normally used.

If you run the blower on 12v, you'll need one that draws 5 to 10 amps to
cool a typical 80% efficient motor. If you're running an aircraft
generator as a motor, they are more like 70% efficient, so they produce
more heat and need an even bigger blower.

> How can you tell if they are universal AC / DC motors?

Universal motors have brushes and a commutator, and a wound field. An
example would be a vacuum cleaner motors. Vacuum cleaners also have
centrifugal blowers, so you could use one for motor cooling. The main
drawback is that they tend to be pretty noisy.

> I am using a 9 inch 120 lbs compound wound motor. Brush temps now
> reach 170f. Air could be blown in the brush end through the motor to
> holes in the drive. Airflow would cover the brushes,coils and exit
> behind the flywheel.

That is how it is normally done. Air goes in the brush end, so they get
the coldest air.

--
Lee A. Hart | Ring the bells that still can ring
814 8th Ave N | Forget the perfect offering
Sartell MN 56377 | There is a crack in everything
leeahart earthlink.net | That's how the light gets in -- Leonard Cohen

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