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Singer vacuum cleaner motor

J

johndee

Jan 1, 1970
0
Hello: I am trying to re-assemble the motor on a vacuum cleaner I
found next to the dumpster. The problem is that I cannot fit the
armature or commutator through the carbon brushes without removing the
stationary magnet first. But, once the armature is fitted correctly so
that the brushes are on it, then I cannot put the stationary magnet
back on. It appears that the bearing and the fan are glued or welded to
the shaft, so I cannot remove those items to replace the stationary
magnet. A diagram would be helpful, but I can't find one. This vacuum
cleaner appears to be made in the early 90's, from the codes on
different pieces throughout. Any suggestions?
 
C

Christopher Tidy

Jan 1, 1970
0
johndee said:
Hello: I am trying to re-assemble the motor on a vacuum cleaner I
found next to the dumpster. The problem is that I cannot fit the
armature or commutator through the carbon brushes without removing the
stationary magnet first. But, once the armature is fitted correctly so
that the brushes are on it, then I cannot put the stationary magnet
back on. It appears that the bearing and the fan are glued or welded to
the shaft, so I cannot remove those items to replace the stationary
magnet. A diagram would be helpful, but I can't find one. This vacuum
cleaner appears to be made in the early 90's, from the codes on
different pieces throughout. Any suggestions?

Ideally the brushes should be removed before you disassemble the motor,
and replaced once the motor is reassembled, but I know some cheap
designs make it hard to remove the brushes. You may be able to pull the
brushes apart using the copper cables which emerge from the rear end of
the brushes, but this is risky. Beyond this, it's hard to suggest much
more without seeing a diagram or photograph.

Best wishes,

Chris
 
J

johndee

Jan 1, 1970
0
Christopher said:
Ideally the brushes should be removed before you disassemble the motor,
and replaced once the motor is reassembled, but I know some cheap
designs make it hard to remove the brushes. You may be able to pull the
brushes apart using the copper cables which emerge from the rear end of
the brushes, but this is risky. Beyond this, it's hard to suggest much
more without seeing a diagram or photograph.

Best wishes,

Chris
Right. The copper wires are slipped into hard-wired connectors, and the
whole brush
assembly is sealed from the rear, thus I cannot pull the brushes back.
I just have to play with it some more. Maybe a thin rigid tube of just
the right diameter to hold the brushes against the spring tension will
allow me to re-assemble it. You are right about poor design.
If I can't get it together soon, I'll try to include a diagram. I will
also look for a manual on the motor itself. Interesting research
problem.
 
S

Sam Goldwasser

Jan 1, 1970
0
johndee said:
Right. The copper wires are slipped into hard-wired connectors, and the
whole brush
assembly is sealed from the rear, thus I cannot pull the brushes back.
I just have to play with it some more. Maybe a thin rigid tube of just
the right diameter to hold the brushes against the spring tension will
allow me to re-assemble it. You are right about poor design.
If I can't get it together soon, I'll try to include a diagram. I will
also look for a manual on the motor itself. Interesting research
problem.

Right. Any sort of jig to keep them out of the way, maybe even a string
tied around the thing holding the brushes that is cut once the armature
is in place.

And, yes, I agree, that some modern electronics seem as though they
were assembled from the inside! :)

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
 
Yes I have done a repair on a motor like this. Tied a thin piece of
copper wire around the long axis of the brush housing to keep the
brushes in place and cut and pulled out the wire after assembly. Some
PM motors use a jig with fingers that hold the brushes in place during
assembly. Some high quality motors, Nagra tape recorders, required that
you use a special jig that maintained the magnetic circuit when you
removed the armature! Not doing so would result in a motor with very
reduced power.
Richard
 
S

Sam Goldwasser

Jan 1, 1970
0
Yes I have done a repair on a motor like this. Tied a thin piece of
copper wire around the long axis of the brush housing to keep the
brushes in place and cut and pulled out the wire after assembly. Some
PM motors use a jig with fingers that hold the brushes in place during
assembly. Some high quality motors, Nagra tape recorders, required that
you use a special jig that maintained the magnetic circuit when you
removed the armature! Not doing so would result in a motor with very
reduced power.

Right. Any motor with a strong permanent manget should NOT be
dissassembled without the keeper. At least to be sure it won't lose
strength. Ferrite is probably immune but other types of magnets
are not. And, they may be magnetized in some strange pattern so that
it's not possilble to recharge at home. Strange but ture.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
 
J

johndee

Jan 1, 1970
0
Thanks to Chris and Sam for replying to the motor re-assembly. I
arrived at the "tie a string" around the brushes idea a couple days
after posting here. It worked. I used dental floss. Maybe thread would
have been more appropriate considering it is a Singer?? Again, thanks
for the posts.
 
E

Electromotive Guru

Jan 1, 1970
0
In all the vacuum-cleaners I have disassembled, I have never seen on
that was permanent-magnet of any significant size. Perhpas you coul
create a general image with MS Paint or something and post it o
fileshack? Then maybe we can see just what kind of situation you ar
facing, or I might even recognise the motor design. Post a link to i
here so we can all see, if you do such..

If anyone knows motors here, it's likely me, so if I can see what yo
are talking about, then I can more easily determine how it wen
together....
 
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