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Hello everyone,
Completely here and tried to post last night already (I'm not sure if it's stuck in moderation, if so - sorry for the double post - or if it just didn't go anywhere).
Yesterday I took my unimat home to be able to do a few bits and bobs on the balcony, and decided to finally remove the sketchy switch and lamp that someone wired in to the cable.
Doing this I realised that the cable inners were very brittle and thought I'd best replace the whole cable.
Opened the motor (which also had been on my to-do list for years) and was greeted by the cables inside it having been held together with electrical tape!..
I have no idea what goes where now.
Picture to give you an idea:?
Does anyone have a schematic for the motor or can give me a hand? I'm currently limited to things I have around the house (semi lockdown) and can't go looking for an alternative solution.
Many, many thanks,
Geoffrey
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Would this picture help?
On 3/19/2020 8:25 AM, GCS wrote:
Hello everyone,
Completely here and tried to post last night already (I'm not sure
if it's stuck in moderation, if so - sorry for the double post -
or if it just didn't go anywhere).
Yesterday I took my unimat home to be able to do a few bits and
bobs on the balcony, and decided to finally remove the sketchy
switch and lamp that someone wired in to the cable.
Doing this I realised that the cable inners were very brittle and
thought I'd best replace the whole cable.
Opened the motor (which also had been on my to-do list for years)
and was greeted by the cables inside it having been held together
with electrical tape!..
I have no idea what goes where now.
Picture to give you an idea:?
Does anyone have a schematic for the motor or can give me a hand?
I'm currently limited to things I have around the house (semi
lockdown) and can't go looking for an alternative solution.
Many, many thanks,
Geoffrey
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Thank you very much. I think I have a chance of getting it to work again now.
I'll report back soon, to check back that where I think what wire goes is right!
Cheers
--
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Right. I've got a few more questions at this point. - The little red lead coming from the capacitor (1.) connect to the earth/ground, right? - Is this little "lip" (marked "??") here for anything specific or is it just fairly random? - I am right in assuming that the two black wires connect to the brush holders too, together with the capacitor, yes? Haven't figured out which goes where yet.    (I'm assuming the last owner had used the correct cable colours for pos/neg.. Anyway, it used to work!) Many thanks in advance! Geoffrey
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I will try to take a pic of one of my partly disassembled motors.
In the meantime here is another pic by the OP of the other photo:
._,_
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1 the little red lead from the? capacitor connects to
ground....seems to be soldered to the motor case.
2 My motor does not have a "lip" there.
3 the two black wires from the cap do connect to the brush
holders. The two bigger black wires have clips on their ends and
do connect to the brush holders:
On 3/21/2020 1:57 PM, GCS wrote:
Right.
I've got a few more questions at this point.
- The little red lead coming from the capacitor (1.) connect to
the earth/ground, right?
- Is this little "lip" (marked "??") here for anything specific or
is it just fairly random?
- I am right in assuming that the two black wires connect to the
brush holders too, together with the capacitor, yes? Haven't
figured out which goes where yet.
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1 the little red lead from the? capacitor connects to ground....seems to be soldered to the motor case. Correct, the case is earthed from your mains supply cable. 2 My motor does not have a "lip" there. Don’t worry about that. 3 the two black wires from the cap do connect to the brush holders. The two bigger black wires have clips on their ends and do connect to the brush holders: If those two bigger black wire go to the field coils then that is correct. Difficult to know which of the bigger black wires goes to which brush holder. If when you run the motor it goes in reverse then just swap those two bigger black wires ?over.
The two black wires from the cap also go to the brush holders but does not matter which ones. I will try to amend the drawing I sent to clarify the connections. Will send it later. ? Bernard ? ?
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From: PeteSent: 21 March 2020 18:18 To: [email protected]; accounts@...Subject: Re: [Unimat] SL U-90 Motor Wiring ? 1 the little red lead from the? capacitor connects to ground....seems to be soldered to the motor case. 2 My motor does not have a "lip" there. 3 the two black wires from the cap do connect to the brush holders. The two bigger black wires have clips on their ends and do connect to the brush holders: ? ? On 3/21/2020 1:57 PM, GCS wrote: Right.
I've got a few more questions at this point.
- The little red lead coming from the capacitor (1.) connect to the earth/ground, right?
- Is this little "lip" (marked "??") here for anything specific or is it just fairly random?
- I am right in assuming that the two black wires connect to the brush holders too, together with the capacitor, yes? Haven't figured out which goes where yet.
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YELLOW dotted wires are your thicker black wires from the field coils to the brush holders (reverse these if the motor is turning in the wrong direction). BLUE dotted wires are the black wires from your capacitor to the brush holders. Which wire goes to which holder makes no difference. RED dotted wire goes to your motor frame which is earthed (grounded) via you mains supply cable. ? The two BLACK squares are your brush holders. ? Hoe it’s understandable ........ Bernard ? ? 
?
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From: PeteSent: 21 March 2020 18:18 To: [email protected]; accounts@...Subject: Re: [Unimat] SL U-90 Motor Wiring ? 1 the little red lead from the? capacitor connects to ground....seems to be soldered to the motor case. 2 My motor does not have a "lip" there. 3 the two black wires from the cap do connect to the brush holders. The two bigger black wires have clips on their ends and do connect to the brush holders: ? ? On 3/21/2020 1:57 PM, GCS wrote: Right.
I've got a few more questions at this point.
- The little red lead coming from the capacitor (1.) connect to the earth/ground, right?
- Is this little "lip" (marked "??") here for anything specific or is it just fairly random?
- I am right in assuming that the two black wires connect to the brush holders too, together with the capacitor, yes? Haven't figured out which goes where yet.
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The insides of this motor is scary, note to self, don't look at the inside of my motor!
I'm following, just in case I get brave and discover a mess.
Tamra
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Tamra, ? I wouldn’t think that someone brave enough to tackle building a spiral staircase would be scared of the insides of a small motor. ? Jerry F. ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Tamra
Sent: Saturday, March 21, 2020 5:10 PM
To: Berniesbits; [email protected]
Subject: Re: [Unimat] SL U-90 Motor Wiring? The insides of this motor is scary, note to self, don't look at the inside of my motor!
I'm following, just in case I get brave and discover a mess.
Tamra
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Hello again,
?
Many many thanks Pete & Bernard!
?
Sorry I didn't get back to you earlier, I got way busier than I had expected last week and didn't get round to doing everything that I wanted to.
?
I've wired most up now, but I'm very unsure where that I'd best attach the ground wires to the case? Ideally somewhere, where they don't get into the way of anything.
I've also never soldered anything up to something with no "direct mating area" if you know what I mean (I've done wires, obviously, and PCB boards but never a bare piece of metal).
?
I'll try to find a good spot and will let you know how it went!
?
Cheers! :)
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On the u90 motor there is a screw at the base of the case where you wire the Earth/ground too,(it’s located on the flat top side) ?it’s also where the grounds for the brushes attach, the screw is held through with a nut so you can easily just loop the ground and tighten the nut.
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Hi Aron,
The only bolt I have is the cable guide, where it enters the case. I guess I can loop it around there too.
I'm wondering if the one you're talking about got cut away when the previous owner cut, what I only can assume is an air vent, into the case?..
Cheers,
Geoffrey
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When I restored mine late last year I had to do a lot to the motors internals to bring it back to spec...
The screw on top of the case at the rear is what I’m on about, inside there is a bit of metal “u” shape that that screw and internal nut lock holds it in place to keep the power cable away from the rotor, subsequently the earth cable, and the brushes housing connecting cable also wraps around the screw, when tighten it holds all the earths ( brushes and mains) while the u shape grips the power cable, I hope that explanation helps more... if you no longer have the screw there it’s an easy thing to replace, the U90 motor dose not have an air vent, it’s a limited run motor (8 mins of use to 10 min cool down) only the unimat 3/4 came with the air cooled fan rotor.
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On 31 Mar 2020, at 22:55, GCS <accounts@...> wrote:
?Hi Aron,
The only bolt I have is the cable guide, where it enters the case. I guess I can loop it around there too.
I'm wondering if the one you're talking about got cut away when the previous owner cut, what I only can assume is an air vent, into the case?..
Cheers,
Geoffrey
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Hi
My U90 motor is currently open : if you want photos : ask !
--
Lio, France - Unimat SL x 3
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1 : Remember to mark the different parts to facilitate the reassembly :  ??? 2? : Since it's open : check the bearing :  ? 3 :
the hole where the small screw is placed which holds both the small red wire (from green capacitor) and
the small curved part which fixes the large wire which leaves outside
 4 : the green old capacitor (1974 !) >> Question : Can it be remove without affecting the operation of the engine ??? >>> my U90 motor blew the house electric meter !!! (the rotor seems ok...)  5 : Take the opportunity to gently clean the collector :  ? 6 : check the wires...  7 :
here we see the small hole where the small screw is placed.
This hole is sometimes hidden by the engine label...
 -- Lio, France - Unimat SL x 3
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 -- Lio, France - Unimat SL x 3
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Hello
Lio:
I use
my drafts person's electric eraser to clean commutators. I use
the gray eraser meant for removing ink.
Notice
the grind marks from dynamic balancing. A better quality
motor.
Carl.
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5 : Take the opportunity to gently clean the collector :
 ?
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Tamra
Lionel
Carl