Need Help!- Rosemount Aerospace electric motor

[cnc2]

Hi everybody !

I need some help about this motor:
http://www.nw-intl.com/IMAGES/p2311m51-1.jpg

I've found it on a wrecked airplane and it's a bit different from the pic as it has a second mounting plate on it.

Motor info:

P/N: 2311m-51-4
HP: 1/8
RPM: 11800
Volt: 28
Amps: 6.2
Cycle: DC
And it turns clockwise, even if i reverse the polarity.

It's a DC motor but it has three wires on it.

So, my questions are:

1) Is it possible to modify that motor to make it turn CW & CCW ? (and how?)
2) Do you think it's a permanent magnet dc motor ? (or what kind of motor is it ?)

3) Very Unprobable but who knows: is it possible to convert it to a servo motor by adding an encoder (for uhu) ? (do you think it will be controllable ?)

4) 1/8 HP 11800 RPM is it enough for a small spindle ?


Thanks !
cnc2.

[Al_The_Man]

It is likely that two wires are motor supply and the third a ground.
The fact it is such high rpm, suggests a series motor, i.e wound field.
to reverse the polarity the field will have to be reversed WRT the armature.
If series, not much good for CNC applications.
Al.

[cnc2]

Thanks Al, that was fast !

I want to add that to make it spin i've plugged two wires one at (+) the other at (-) and the third wire was unplugged ,what's the difference between ground & (-) ?

So i'll try to use it as a small spindle for wood engraving or pcb milling ...etc

Regards,
cnc2.

[Al_The_Man]

Yes you could use it for engraving or similar operation.
If one wire is in fact ground, there will be continuity to the case.
-ve is the power supply common, it is not necessarily at ground potential, unless the application calls for it.
Al.

[cnc2]

Thanks for your help Al !

Best regards,
cnc2.

[cnc2]

Hi everybody !

I finally opened the motor and found it has windings instead of permanent magnets (Al was right ;-) and also found the third wire was coming out of a switch (interupter) that opens and closes at a certain amount of motor shaft turns (you can say aprox one "tic" per ten turns) and the voltage on the third wire goes from around 3 V to 0 V at each "tic" and goes back to around 3 V.

So, is that a tachometer ? and how can it be used ?
Is there a way to (or a controller board) to control this motors speed ? (for "rigid" tapping for exemple, i know it won't turn CCW, even if i have to remove the tap manually, should be ok for hobby use)

1/8 HP at 11800 rpm, is it enough as a spindle if geared down trough timing pulleys, can it give me 1 HP at 1475 rpm ? for comparison, can it be as powerful as an X1's spindle or as an X3's ?


Thanks !

cnc2.