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Re: [EVDL] How hot is too hot for a 9" DC motor?

Hello Corbin,

I never let this motor go over 140 F. which is taken at the field coils. I
have two thermo switches lace to the field coils, one 180 degrees apart.
They are standard motor thermo switches which I got from a motor shop that
has a 20 degrees differential. At 140 F, this switch opens and when the
motor cool down to 120 F, which only turns on a pair of 12 V LED indicators.

The WarP 9 never got over 105 F. for me, because I use a 6 inch Dayton fan
blower that I place right on top of the brush cover. Made a curve adapter
from a piece of steel tubing and welded on tabs on it that came down the
face of the motor which bolted on to the 5/16 inch bolt holes on the face.
Use a piece of sheet rubber between the adapter and motor cover.

You can get this blower motor from evsource.com. I attach a 6 inch air
filter housing and filter to the inlet which you can get a some auto parts
store.

I never enclose the bottom of the motor compartment. I just welded on a
deflector plate on the cross member that only extended back just beyond
brush cover. To prevent splashing from the tires, I drape a large rubber
sheet down over the suspension which came down even with the bottom of the
motor. This rubber sheet has been on my EV since 1985 and I go through 12
inches of snow with no problems.

Another thing you could do, is to install this type of blower with a air
filter inline with a flexible PVC duct that will attach to a 90 PVC elbow
and attach the brush cover with the same type of adapter plate as I use for
the fan.

Roland


----- Original Message -----
From: "corbin dunn" <[email protected]>
To: "EVDL Discussion List" <[email protected]>
Sent: Saturday, February 19, 2011 10:06 AM
Subject: [EVDL] How hot is too hot for a 9" DC motor?


> Hi All,
> I'm wondering if I need to cool my Warp 9 during "normal" use. The motor
> gets warm to the touch when it is just air cooled. However, after
> enclosing the underneath area of my car to waterproof it, the motor gets
> too hot to keep my hand on (yeah, scientific.). I'm going to get a cheap
> laser thermometer to find out what the temperatures are, but I was
> wondering if "too hot to touch" is normal for the 9" motors under normal
> load. After I get the thermometer, I can find out actual temperatures,
> but I want to known what "normal" operating temperatures are.
>
> I'm currently looking into blower cooling options (see my notes at:
> http://www.corbinstreehouse.com/blog/2011/02/plug-bug-motor-cooling-ideas-and-notes/ )
>
> --corbin
>
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