8mm Forum: What does the fan cool in a projector?

This is topic What does the fan cool in a projector? in forum 8mm Forum at 8mm Forum.

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Posted by Pete Richards (Member # 2203) on August 15, 2013, 07:45 PM:

All film projectors seem to have a 'blower' type fan attached to the motor.
Is this for cooling the bulb or the motor or both?

Posted by Winbert Hutahaean (Member # 58) on August 15, 2013, 08:19 PM:

I don't think a motor needs fan.

If it does, who will cool the fan's motor.... [Big Grin]

Posted by Barry Fritz (Member # 1865) on August 15, 2013, 08:32 PM:

It is for cooling the lamp.

Posted by Steve Klare (Member # 12) on August 15, 2013, 08:35 PM:

It cools the bulb, it cools the motor and in a sound projector it cools the power semiconductor devices in the amplifier circuitry.

The motor really doesn't need cooling that badly, but just like a lot of devices the cooler it runs the longer it will last.

Posted by Dominique De Bast (Member # 3798) on August 16, 2013, 12:16 AM:

It is advised to never move a projector while the lamp is not cool as its filament is more fragile when it's hot.

Posted by Maurice Leakey (Member # 916) on August 16, 2013, 02:31 AM:

As Steve says, the fan helps to keep the whole of the interior of a projector from overheating, even more so with a sound projector with its delicate components.

Posted by Pete Richards (Member # 2203) on August 16, 2013, 02:48 AM:

I was just wondering if it could be removed when using it as a telecine system with a cold light source.

Posted by Hugh Thompson Scott (Member # 2922) on August 16, 2013, 10:06 AM:

I would think your cold light source is not going to be as efficient
as a mirrored one as used.

Posted by Bruce Wright (Member # 2793) on August 16, 2013, 03:24 PM:

Hi Pete
Go for it and let us know the results [Big Grin]

Posted by Steve Klare (Member # 12) on August 16, 2013, 05:50 PM:

The bulb is the major source of heat in any projector. They are pretty inefficient: if you are pouring 150W of electric power into an incandescant you get about 135W of heat. It would be great if you were trying to build a heater instead of a lamp!

Without that little furnace in there you could probably get away without a fan.

-Still the same, with a sound machine I'd want to have some kind of fan in there even if just for confidence.

Why do you want to remove the fan, noise?

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