Mill motor - what type of motor is this ?

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16 Oct 2011 05:11 #13941 by 1:1
I have an Emco milling attachment for my Emco Maximat V10

When I got it the electronics were listed as dodgy and sure enough turning it on it caught fire :lol:

I've replaced the lathe motor with a spare AC servo I have here - not wanting to get into the original burned control unit nor fork out for a new motor for the mill I'm keen top learn about the motor there is on it - maybe I can use a spare drive (granite devices VSD-XE) I have here to run it ?

It has 4 wires coming from it - is this something easy to a. figure out what it is ? and if it is easy to figure out b. easy to drive/run ?

One pic attached - the rest here:

farm7.static.flickr.com/6095/6248295701_da6e1f69a0_b.jpg
farm7.static.flickr.com/6101/6248820714_53326833e9_b.jpg
farm7.static.flickr.com/6211/6248295633_9805480ca9_b.jpg

www.talkfestool.com/vb/members/joraft-al...3343-maximat-v10.jpg
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17 Oct 2011 00:20 #13959 by andypugh
It looks like a conventional 3-phase induction motor.
is there any sign that the rotor is strongly magnetic? if not, then an induction motor is what it is, and you probably need a small VFD

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17 Oct 2011 00:34 - 17 Oct 2011 00:34 #13961 by 1:1
I've done a bit more hunting online since - although I agree with your deduction, turns out although it is induction its particular implementation is different from 3 phase induction motor...

clues:

- Burned control box was mostly just two large caps and a bunch of mechanical switching hoo hah
- It's a single phase system

www.industrial-electronics.com/AC-DC-mot...apacitor-Motors.html

The caps stay in the circuit whilst running ... the three wires are because the cap is kept away from the motor - nice and confusing huh :silly:

I found a spare motor cap at 5uF in the box of bits that came with the lathe - an emco parts list says it should be either 8uF or 20uF (it isn't clear) - the diagrams I've found so far also indicate this motor type is the correct one to look at.

I might just give it a go ;)
Last edit: 17 Oct 2011 00:34 by 1:1.

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17 Oct 2011 09:18 #13974 by andypugh
1:1 wrote:

I've done a bit more hunting online since - although I agree with your deduction, turns out although it is induction its particular implementation is different from 3 phase induction motor...

I was mainly working on the number of wires, and seeing that one was green :-)

Make sure that you use a "Motor Run" type capacitor, a normal one will overheat.

This book is very worthwhile reading (it covers practical motor applications)
www.amazon.co.uk/Electric-Motors-Worksho...tice-S/dp/1854862464

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