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X3 Milling machine Motor Overheating and tripping house RCD

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lordedmond:
Chris

Well it's good and bad news at least you now know what's what.

It was about 48 years ago when I was in the winding dept and knowing the size it would only be a 1 hour job if the com was ok and a over night stove

But alas the charge like rhinos for small one offs

Stuart

PK:
I burnt the motor out on my X3 in about a week. YMMV, but I don't have much time for those cheap DC motor/drive combinations.
You can see my, perfectly sensible and understated fix here: http://www.caswa.com/cncathome/X3.html

raynerd:
Hi PK. I Actually have a .75hp inverter that I had on a motor horizontal mill once and I can get a brand new matching 3 phase motor for £110. I'll go with this if the motor goes again or controller goes. For now I'm just going to shell out and buy a new motor. Ordered it from Arc yesterday, it arrived this morning. I've hooked it up and it spins so that's a good start. However, I've had to go my inlaws and school Christmas fair so I can't tell if the problem has been cured....I will use the mill properly this evening and check but first signs look promising,

lordedmond:
Chris

one point has made me look back through this thread.

you were cutting gears in your pic , by nature of this operation you would have been at low speed for a while. consider fitting a extra fan to help with the air flow for the motor , they blow down

the same will apply if you do go the VFD route you will need a extra fan to cool the motor , don't forget in both cases they are designed for proper cooling at rated revs not at slow speed

many large motors that have speed controllers have a large independent  fan/motor that is at full speed all the time

Stuart

PK:
Stuart makes a good point.
Even cheaper, and this has saved me once, is the 50 cent thermister that most VFD'a have an input for. It'll stop the drive if the motor gets too hot. 

You'll think something has broken, curse and rant, then you'll touch the motor and realise that 50c just saved you $200....

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