Circuit board drill spindle

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Fausto

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I figured this would be as good a place as any to ask this so here it goes. I got a few circuit board drill/spindles from an old friend who used to work in that industry. They are brushless, about 2” diameter about 8” L, with a collet type nose that im guessing a max cap of 1/4”. They have a 3 pin 3 wire connector and nothing more. Resistance is 2ohm pin to pin. Any Idea what I need to make one of these things go? I am capable of doing electronic assembly and piecing together a DC power supply but I’m unsure as of yet what i need.
Any guidance will be really appreciated.
 
May be brushless pm motor...3 phase.

Start with a 9 volt battery and pick 2 wires.

Touch them to battery and see if it moves.

Then swap one wire with the remaining and see if it moves more.

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If they are three phase motors you probably are out of luck unless you are familiar with that type of power supply and can put something together or adapt something from off the shelf
 
Plus, you need to figure out the Voltage. They make 24v ones and 240 volt... I've used both.

My old 24v spindle measures 0.6 Ohms line to line. My 240VAC 400 Hz spindle is 2.4 Ohms line to line.

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If you can get the voltage figured out, you could look into using R/C speed controllers. They work with 3 phase brushless PM motors and tend to be 3 wire. I have no idea about frequencies, but I imagine if you're even close it'll spin. You don't need much torque, it's more about speed for those tiny drills.
 
If you can get a part number off of them you could find out what they require as far as power
 
Based on my spindles, 2 Ohm phase resistance says "high voltage"

Look hard for numbers on them... photos help too!

120 will have thicker wire due to needing twice the current. I would expect a significantly lower DC resistance. BUT my 220 one was higher resistance than yours... 2.4 Ohm IIRC.

Meg it if you can...

I think it's pretty likely you can hook it to a small vfd and make it go. The 120 in, 240 out ones are nice for this. Some programming needed for 400 Hertz operation.

I have this one off Fleabay:
VEVOR 2.2KW Air Cooled Spindle Motor 80MM for CNC Router Engraving 4 Bearings

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The spindle motors for PCB drilling are fast, 4k up to maybe 30k rpm; the small
drills don't work well at lower speeds. Those are always either universal or DC motors,
so try them with a DC power supply.

(maybe I shouldn't say 'always'; there could be brushless synchronous ones, but
that's a high-cost option)

A VFD doesn't do anything useful with universal or DC motors, those have no frequency
dependence to speak of.
 
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