Re: [ElectricMotorcycles] dc fan cooling

[Jeff Blamey]

What is really crazy is that the mfg. of the motors (PMG or Etek) did not consider a way to shed the heat expected when the motor is run at max voltage/current. The housing of the PMG (which I use) would have been better designed as a finned aluminum, and provide a duct in and out to provide outside cooling air. They obviously knew the cooling was necessary since they have liquid cooled industrial motors in their portfolio I recall.

Been doing some checking on the PMG, the temp on the brush area never seems to rise much over 115 degrees F, however the motor housing can get quite hot 150 degrees F, the internal temp can get a good bit above 150 degrees F after a few full throttle runs. I should be writing this down at the time so I can give accurate numbers instead of my faulty memory(!).

Anybody play with the throttle ramps I was thinking the Alltrax supports, have results?

I am torn, 1 or 2 small low current 12v fans, or some larger 12v fan. Ducting is key. Still noodling that one, clearance between motor and frame and power leads... don't want to cobble it together.

Jeff

-----Original Message-----
From: paul wiley <[EMAIL PROTECTED]>
Sent: Jul 10, 2007 9:33 AM
To: ElectricMotorcycles
Subject: Re: [ElectricMotorcycles] dc fan cooling

I used a 6 inch 12v fan on mine. I am not sure what the cfm is but the fan has decent pitch in the blades and sounds like it is moving a bunch of air. Mine is mounted directly to the brush cover on the etek. I would like to use an 8 or 10 inch with a duct around the whole motor. I would like to know which direction the internal fan is moving the air as to not conflict with it.

 

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