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X3 Milling machine Motor Overheating and tripping house RCD

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raynerd:
Stuart, pk, -  what sort OD additional fan should I be buying?

PekkaNF:
one that fits on shroud over the motor

Visually like this:
http://www.wistro.com/index.php?co=en

Here is some commercial unit data:
www.kmmp-usa.com/products/FBI/Massblaetter/kMMp_0M_technische_Daten_2014.pdf

What is OD of your motor? Something like 63/71 motor size?

PDF, 2/3 down "Forced ventilation unit" 20W seems to get you up to 71 frme size
http://www.rotor.co.uk/forcevent.html

What sort of air duct fans there are in britain for buildings, like toilet extractor fans, or inline air duct fans? Here stadard cheap bathroom fans are not that expensive.

Found this sort of:
http://www.screwfix.eu/manrose-xf100s-20w-axial-bathroom-fan.html


There are few things to consider:
* flow must be good enough. Compuer fans are generally too small. Air is not that great conductor, therefore you need a good flow of it. Bit like a blow on angle grinder. Few wats will not do, 20W a starting point, idustrial ones seems to be 20-40w smallest sizes.
* Check that you will be not fighting agains internal fan on greater rpm.
* Air duct reducer might provide smooth transition and correct size for the shroud.

I don't know how this motor looks, i'm assuming it has internal fan and cooling air entry is at brush end, exhaust at power take out end.

Pekka

lordedmond:
Chris

A muffin fan as used in a PCs but please fit a guard they do chop fingers , power from a 5 v Dc wall wart but you can get mains voltage ones


Stuart

PK:
Well, right now you have no fan. So any extra air is good. If you're never going to run a VFD+motor below 50Hz, then you don't need a fan. If you are, then you might need one. 
Personally, I hate fan noise so I don't fit them. I prefer the to go up in motor power and set sensible current limits on the drives. My motors rarely get more than warm..

raynerd:
 :D All up and running now!!

Is it just one of those things or is there anything I can do to stop this happening again - I.e speeds and such

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