Espritmodel.com Telemetry Radio
 
Thread Tools
Old Jul 08, 2006, 12:11 PM
Tim Leech
Guest
n/a Posts
Can someone please tell me what this is (electrical)?

http://web.onetel.com/~duttondock/Pictures/motor-1.jpg

http://web.onetel.com/~duttondock/Pictures/motor-2.jpg

It's a sort of 'inside out' motor, the armature/stator is fixed to
what looks like a panel mount. It has two independent windings, each
of about 50 ohm DC resistance.

The outer rotor appears to be just a light alloy diecasting, and is
rigidly fixed to the 4mm dia spindle. No sign of any permanent
magnets.

My best guess is some sort of control device, a current through one
winding induces a current in the second which will vary as the outer
rotor is turned. Any better or more detailed ideas? I've landed myself
with a number of them as part of a job lot.

Cheers
Tim

Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service
Old Jul 08, 2006, 12:11 PM
mark@ems-fife.co.uk
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?


Tim Leech wrote:
> http://web.onetel.com/~duttondock/Pictures/motor-1.jpg
>
> http://web.onetel.com/~duttondock/Pictures/motor-2.jpg
>
> It's a sort of 'inside out' motor, the armature/stator is fixed to
> what looks like a panel mount. It has two independent windings, each
> of about 50 ohm DC resistance.
>
> The outer rotor appears to be just a light alloy diecasting, and is
> rigidly fixed to the 4mm dia spindle. No sign of any permanent
> magnets.
>
> My best guess is some sort of control device, a current through one
> winding induces a current in the second which will vary as the outer
> rotor is turned. Any better or more detailed ideas? I've landed myself
> with a number of them as part of a job lot.
>
> Cheers
> Tim
>
> Dutton Dry-Dock
> Traditional & Modern canal craft repairs
> Vintage diesel engine service



A roll motor perhaps.As in pressed in to a tube.Seen bigger ones like
that.
Mark
www.ems-fife.co.uk

Old Jul 08, 2006, 04:11 PM
Greg
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

"Tim Leech" <duttondock@onetel.no.spam.com> wrote in message
news:r9hva2tf300t0m9s85h3po7cajh02fea4p@4ax.com...
> http://web.onetel.com/~duttondock/Pictures/motor-1.jpg
>
> http://web.onetel.com/~duttondock/Pictures/motor-2.jpg


It's a simple induction motor, driven with three phase it produces a
rotating magnetic field that induces eddy currents in the alloy rotor and
drags it around. Just the same principle as a common three phase motor but
it's an outrunner, i.e. the rotor is on the outside, which makes a compact
motor with more torque. Beware that it may not be designed for mains voltage
or even 50Hz, what did it come out of?.

Brushless DC motors with this configuration are becoming very common place,
the only real difference is that the rotor has a steel ring that is lined
with small magnets. By sheer coincidence I bought one this afternoon for a
small plane, I hope this convoluted link works:

http://www.modelmotors.cz/index.php?...9%20-%2057%20g)

Greg


Old Jul 08, 2006, 04:11 PM
Tim Leech
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

On Sat, 8 Jul 2006 21:14:22 +0100, "Greg"
<news@SPAM123voyager2.nildram.co.uk> wrote:

>"Tim Leech" <duttondock@onetel.no.spam.com> wrote in message
>news:r9hva2tf300t0m9s85h3po7cajh02fea4p@4ax.com.. .
>> http://web.onetel.com/~duttondock/Pictures/motor-1.jpg
>>
>> http://web.onetel.com/~duttondock/Pictures/motor-2.jpg

>
>It's a simple induction motor, driven with three phase it produces a
>rotating magnetic field that induces eddy currents in the alloy rotor and
>drags it around. Just the same principle as a common three phase motor but
>it's an outrunner, i.e. the rotor is on the outside, which makes a compact
>motor with more torque. Beware that it may not be designed for mains voltage
>or even 50Hz, what did it come out of?.
>


It didn't come out of anything, other than a cardboard box. I have 15
of them, all in unmarked boxes.
Note that I said there are *two* windings, not sure how you run that
on 3 phases. Maybe one phase with a shifting capacitor? The outer
'rotor' is finely machined over most of its length, which would
support Mark's suggestion that it is intended to be pressed into a
tube.

Cheers
Tim

Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service
Old Jul 08, 2006, 04:11 PM
Andrew Mawson
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?


"Tim Leech" <duttondock@onetel.no.spam.com> wrote in message
news:kr50b2h9cgj7u4e636fc44im4l3q895qot@4ax.com...
> On Sat, 8 Jul 2006 21:14:22 +0100, "Greg"
> <news@SPAM123voyager2.nildram.co.uk> wrote:
>
> >"Tim Leech" <duttondock@onetel.no.spam.com> wrote in message
> >news:r9hva2tf300t0m9s85h3po7cajh02fea4p@4ax.com.. .
> >> http://web.onetel.com/~duttondock/Pictures/motor-1.jpg
> >>
> >> http://web.onetel.com/~duttondock/Pictures/motor-2.jpg

> >
> >It's a simple induction motor, driven with three phase it produces

a
> >rotating magnetic field that induces eddy currents in the alloy

rotor and
> >drags it around. Just the same principle as a common three phase

motor but
> >it's an outrunner, i.e. the rotor is on the outside, which makes a

compact
> >motor with more torque. Beware that it may not be designed for

mains voltage
> >or even 50Hz, what did it come out of?.
> >

>
> It didn't come out of anything, other than a cardboard box. I have

15
> of them, all in unmarked boxes.
> Note that I said there are *two* windings, not sure how you run that
> on 3 phases. Maybe one phase with a shifting capacitor? The outer
> 'rotor' is finely machined over most of its length, which would
> support Mark's suggestion that it is intended to be pressed into a
> tube.
>
> Cheers
> Tim
>
> Dutton Dry-Dock
> Traditional & Modern canal craft repairs
> Vintage diesel engine service


Variable speed fan motors - driven by 2 phase bit of electronics and
pressed into a plastic fan ?

AWEM


Old Jul 08, 2006, 08:11 PM
John Stevenson
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

On Sat, 08 Jul 2006 15:57:07 +0100, Tim Leech
<duttondock@onetel.no.spam.com> wrote:

>http://web.onetel.com/~duttondock/Pictures/motor-1.jpg
>
>http://web.onetel.com/~duttondock/Pictures/motor-2.jpg
>
>It's a sort of 'inside out' motor, the armature/stator is fixed to
>what looks like a panel mount. It has two independent windings, each
>of about 50 ohm DC resistance.
>
>The outer rotor appears to be just a light alloy diecasting, and is
>rigidly fixed to the 4mm dia spindle. No sign of any permanent
>magnets.
>
>My best guess is some sort of control device, a current through one
>winding induces a current in the second which will vary as the outer
>rotor is turned. Any better or more detailed ideas? I've landed myself
>with a number of them as part of a job lot.
>
>Cheers
>Tim
>


Tim, I often get bigger versions of this type of motor in out of fans.
The outside presses or bolts into the blade hub.

..
--
Regards,

John Stevenson
Nottingham, England.

Visit the new Model Engineering adverts page at:-
http://www.homeworkshop.org.uk/
Old Jul 08, 2006, 08:11 PM
Greg
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

"Tim Leech" <duttondock@onetel.no.spam.com> wrote in message
news:kr50b2h9cgj7u4e636fc44im4l3q895qot@4ax.com...
> It didn't come out of anything, other than a cardboard box. I have 15
> of them, all in unmarked boxes.
> Note that I said there are *two* windings, not sure how you run that
> on 3 phases. Maybe one phase with a shifting capacitor?


It's not clear how many wires there are from the pictures, are there 4 i.e.
two isolated windings?. Yes you can get a rotating field with two phases,
some aircraft use 2 phase 90 degrees for some motors for example, in this
case I would indeed expect a phase shifting cap.

> The outer
> 'rotor' is finely machined over most of its length, which would
> support Mark's suggestion that it is intended to be pressed into a
> tube.


I doubt it, I've seen very similar motors in equipment and the threaded part
was mounted through a hold in a chassis plate with a pulley fitted to the
shaft.

Greg


Old Jul 09, 2006, 04:11 AM
Tim Leech
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

On Sat, 8 Jul 2006 22:06:47 +0100, "Andrew Mawson"
<andrew@no_spam_please_mawson.org.uk> wrote:

>
>"Tim Leech" <duttondock@onetel.no.spam.com> wrote in message
>news:kr50b2h9cgj7u4e636fc44im4l3q895qot@4ax.com.. .
>> On Sat, 8 Jul 2006 21:14:22 +0100, "Greg"
>> <news@SPAM123voyager2.nildram.co.uk> wrote:
>>
>> >"Tim Leech" <duttondock@onetel.no.spam.com> wrote in message
>> >news:r9hva2tf300t0m9s85h3po7cajh02fea4p@4ax.com.. .
>> >> http://web.onetel.com/~duttondock/Pictures/motor-1.jpg
>> >>
>> >> http://web.onetel.com/~duttondock/Pictures/motor-2.jpg
>> >
>> >It's a simple induction motor, driven with three phase it produces

>a
>> >rotating magnetic field that induces eddy currents in the alloy

>rotor and
>> >drags it around. Just the same principle as a common three phase

>motor but
>> >it's an outrunner, i.e. the rotor is on the outside, which makes a

>compact
>> >motor with more torque. Beware that it may not be designed for

>mains voltage
>> >or even 50Hz, what did it come out of?.
>> >

>>
>> It didn't come out of anything, other than a cardboard box. I have

>15
>> of them, all in unmarked boxes.
>> Note that I said there are *two* windings, not sure how you run that
>> on 3 phases. Maybe one phase with a shifting capacitor? The outer
>> 'rotor' is finely machined over most of its length, which would
>> support Mark's suggestion that it is intended to be pressed into a
>> tube.
>>
>> Cheers
>> Tim
>>
>> Dutton Dry-Dock
>> Traditional & Modern canal craft repairs
>> Vintage diesel engine service

>
>Variable speed fan motors - driven by 2 phase bit of electronics and
>pressed into a plastic fan ?
>


The consensus being it's just an motor I reckon it was designed to be
used in two possible ways:
as a fan motor, for example, with the hub pressed onto the body; or
driving something else via the shaft. I can't see why else the shaft
would protrude, and most but not all of the body OD be finely
machined. Any load on the body would have to be axial, eg a fan,
because of the lack of support.

I doubt that it's for mains voltage, judging by the insulation on the
flying leads. When I've got nothing better to do I'll try playing
about with one on 24V AC & see what I can get out of it.

Thanks
Tim

Please let me know if you have any use for such a thing. I doubt that
I have.
Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service
Old Jul 09, 2006, 06:11 AM
Rodney Pont
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

On Sun, 09 Jul 2006 09:09:56 +0100, Tim Leech wrote:

>The consensus being it's just an motor I reckon it was designed to be
>used in two possible ways:
>as a fan motor, for example, with the hub pressed onto the body; or
>driving something else via the shaft. I can't see why else the shaft
>would protrude, and most but not all of the body OD be finely
>machined. Any load on the body would have to be axial, eg a fan,
>because of the lack of support.


I've seen a motor very similar to this as the capstan motor on a very
old open reel tape recorder.

--
Regards - Rodney Pont
The from address exists but is mostly dumped,
please send any emails to the address below
e-mail ngpsm4 (at) infohitsystems (dot) ltd (dot) uk


Old Jul 09, 2006, 06:11 AM
Greg
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

"Rodney Pont" <spamotl3@infohitsystems.ltd.uk> wrote in message
news:atcfzvasbuvgflfgrzfygqhx.j253li0.pminews@ouse ...
> I've seen a motor very similar to this as the capstan motor on a very
> old open reel tape recorder.


The last one I saw was driving the tape loop on a very old dictapfone type
machine.

Greg


Old Jul 11, 2006, 06:11 PM
Tim Leech
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

On Sat, 08 Jul 2006 23:18:04 GMT, John Stevenson
<john@stevenson-engineers.co.uk> wrote:

>On Sat, 08 Jul 2006 15:57:07 +0100, Tim Leech
><duttondock@onetel.no.spam.com> wrote:
>
>>http://web.onetel.com/~duttondock/Pictures/motor-1.jpg
>>
>>http://web.onetel.com/~duttondock/Pictures/motor-2.jpg
>>
>>It's a sort of 'inside out' motor, the armature/stator is fixed to
>>what looks like a panel mount. It has two independent windings, each
>>of about 50 ohm DC resistance.
>>
>>The outer rotor appears to be just a light alloy diecasting, and is
>>rigidly fixed to the 4mm dia spindle. No sign of any permanent
>>magnets.
>>
>>My best guess is some sort of control device, a current through one
>>winding induces a current in the second which will vary as the outer
>>rotor is turned. Any better or more detailed ideas? I've landed myself
>>with a number of them as part of a job lot.
>>
>>Cheers
>>Tim
>>

>
>Tim, I often get bigger versions of this type of motor in out of fans.
>The outside presses or bolts into the blade hub.
>
>.

OK, what's this for?

about 10" dia., appears to be some sort of AC servo motor (3 motor
wires & 5 for a tacho or encoder)

Cheers
Tim


Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service
Old Jul 11, 2006, 06:11 PM
Tim Leech
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

On Tue, 11 Jul 2006 22:35:51 +0100, Tim Leech
<duttondock@onetel.no.spam.com> wrote:

>On Sat, 08 Jul 2006 23:18:04 GMT, John Stevenson
><john@stevenson-engineers.co.uk> wrote:
>


>>>

>>
>>Tim, I often get bigger versions of this type of motor in out of fans.
>>The outside presses or bolts into the blade hub.
>>
>>.

>OK, what's this for?
>
>about 10" dia., appears to be some sort of AC servo motor (3 motor
>wires & 5 for a tacho or encoder)
>


Sorry, missed this out:-

http://web.onetel.com/~duttondock/Pictures/motor-5a.jpg

Tim
Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service
Old Jul 11, 2006, 06:11 PM
John Stevenson
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

On Tue, 11 Jul 2006 22:35:51 +0100, Tim Leech
<duttondock@onetel.no.spam.com> wrote:


>>.

>OK, what's this for?
>
>about 10" dia., appears to be some sort of AC servo motor (3 motor
>wires & 5 for a tacho or encoder)
>
>Cheers
>Tim
>
>
>Dutton Dry-Dock
>Traditional & Modern canal craft repairs
>Vintage diesel engine service


Pancake servo motor,
Could be off an old tape drive ?
--
Regards,

John Stevenson
Nottingham, England.

Visit the new Model Engineering adverts page at:-
http://www.homeworkshop.org.uk/
Old Jul 11, 2006, 06:11 PM
Greg
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

"Tim Leech" <duttondock@onetel.no.spam.com> wrote in message
news:0h68b25qjcqkeufli0p08p0ghsmt5r5kg5@4ax.com...
> >OK, what's this for?
> >
> >about 10" dia., appears to be some sort of AC servo motor (3 motor
> >wires & 5 for a tacho or encoder)


It's hard to tell, can you take more pictures from other angles please, is
there any 'cogging' when you turn it that would indicate magnets?. At first
sight I would agree it's likely to be a servo motor with feedback, though
most are cylindrical with a shaft. At this sort of size servo motors are
more often than not 180V as it makes the inverter design simple.

Greg


Old Jul 11, 2006, 06:11 PM
Tim Leech
Guest
n/a Posts
Re: Can someone please tell me what this is (electrical)?

On Tue, 11 Jul 2006 22:02:12 GMT, John Stevenson
<john@stevenson-engineers.co.uk> wrote:

>On Tue, 11 Jul 2006 22:35:51 +0100, Tim Leech
><duttondock@onetel.no.spam.com> wrote:
>
>
>>>.

>>OK, what's this for?
>>
>>about 10" dia., appears to be some sort of AC servo motor (3 motor
>>wires & 5 for a tacho or encoder)
>>
>>Cheers
>>Tim
>>
>>
>>Dutton Dry-Dock
>>Traditional & Modern canal craft repairs
>>Vintage diesel engine service

>
>Pancake servo motor,
>Could be off an old tape drive ?



Bl**dy big tape drive! <G>
To partly answer Greg, there's no detectable cogging.

Another pic at

http://web.onetel.com/~duttondock/Pictures/motor-5b.jpg

Cheers
Tim

Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service
 


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Can someone please help me with this?? epc2 Power Systems 0 Dec 27, 2004 06:32 PM
Can Someone Tell Me What This Is....... telecom tech Racing Boats - Electric 6 Sep 17, 2004 02:03 AM
Can someone please tell me how jdd44 Beginner Training Area (Aircraft-Electric) 5 Mar 22, 2004 08:07 PM
Can someone tell me what this motor is for? KeithLuneau Parkflyers 10 Jan 07, 2002 08:33 PM
Help!! Can someone please tell me how to hook up a twin in paralell? Joe Elston Power Systems 6 Oct 22, 2001 06:37 PM