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micro mill electricals problems, help please!!

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rleete:
I believe that is the correct one.  I bought mine from Little Machine Shop, and they knew which one to send.  It has been a while, so I'm just going from memory.

JohnHaine:
Other people have used this item number from eBay to replace the speed controller with success

181473818094

pmdevlin:
well I'm in  a mess now, don't know what to do. The motor has been tested and reported to be burnt out. I took the motor apart before giving in to be tested, and could not see any evidence of this. The guy has connected up to 110v ac to test it, on the basis that the motor has a big spec sticker on it, and it does actually say 240v ac, however, on the arc euro site, the replacement motor says its a dc??????

He says the motor ran for a very short period, then gave up, and a possible short was causing the fuses to blow and the motor to spin up without potentiometer input. I'm confused? I thought it was a DC motor, so why on the big sticker on the can it does clearly say its AC?

So no further on really, except now I need a motor, and might still need a control board, anybody got any recommendations for a direct fit motor other than a massively expensive £88 from arc euro, and that might not even be the fix!

John Rudd:
Firstly, sounds like the controller board is u/s, with the pot in the off position there should be no power to the motor light bulb whatever....the fact that the lamp lit as soon as power was applied suggests the mosfet on the board has died....A fairly easy fix IMHO....



Secondly, the motor is definitely DC if it has brushes and magnets.....no field coils...would confirm this.

If connecting the motor to an ac source then damage to the motor will occur, the alternating field setup in the armature would cause it not to rotate......


Where abouts are you?
Any where near Hull?

lordedmond:
The guy you took that motor to test did not know his stuff and he should foot the bill because he has burt out the motor not you

Let me explain ,
I am a time served Sparks and have done some time in armature and stator winding when I gave up work I was an electrical engineer to PhD level
Ok back to your motor a universal motor has a series field coil not a perm magnet one, when the AC volts reverses as it does 50 time a sec the field does along with the armature and every thing is in step so it's ok as it is on DC .
Now with a perm mag field it cannot reverse but the armature field will hence it no go and it will release the magic smoke alas it will not be able to be refilled.

I would bite the built and get a new motor and controller from one of the dealers then you will know it will work. But please do not let that guy anywhere near it

Stuart

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