Posted to uk.d-i-y
|
|
Mains motors in the workshop
HI Tim
On Sat, 13 May 2006 18:42:40 GMT, "Tim Morley" tim.morley*REMOVE
wrote:
"Adrian Brentnall" adrian-the papers and the wrote
in message ...
HI Roger
Thanks for the reply
On Sat, 13 May 2006 15:51:21 +0100, "Roger Mills"
wrote:
In an earlier contribution to this discussion,
Adrian Brentnall adrian-the papers and the
wrote:
Hi All
Until last week I was using a little (probably 1/3hp) electric motor
to power a combination diamond saw / grinder / polisher unit. I guess
that the original motor was ex an old washing machine.
Anyway - last week, said motor gave a gasp and died. Now all it will
do is buzz weakly - and won't turn - mains lights in the workshop dim
while it's buzzing (not a good sign, I think).
So - bright idea time !
Saw something on the web about using a cheapie bench grinder as a
motor - found one in Homebase, and lo & behold the pulley fitted in
place of the grinding wheel. Result !
Sadly not - the new little motor is perfectly happy to spin its own
grinding wheels - but refuses to start when faced with the effort of
spinning the combination unit - it now sits and buzzes weakly.....
darn !
The new thing's rated at 150Watts - which is probably a bit on the
light side - but any idea why it'll happily spin up its own wheels but
not my combo unit....?
Alternatively - what's the chance or fixing the old motor - no magic
smoke escaped - so I'm hopeful.... g
Does the original motor have a starter capacitor? If so, there's a fair
chance that that's failed, and gone something akin to short circuit. If
you
replace that, the motor will probably work.
I've uploaded some photos of the motor - they're at
http://www.inspired-glass.co.uk/electric-motor.htm
The little cover over the electrical connections has a schematic which
seems to show a capacitor - would this be the starter capacitor ?
If so - do you know where it is ? - do I have to undo the long bolts
which appear to hold the two end castings together - and then does it
all become clear ??? g (or do I end up with a bag of bits g)
Thanks in advance
Adrian
======return email munged=================
take out the papers and the trash to reply
Looking at the top picture, is that a shiny wire link between terminals z
and a at the top?
Yes indeed - well spotted g
If so then its wired as the RHS of the 3rd picture. This
is marked TS 43-58. I assume that this will be stamped on the motor
nameplate.
Last night in the dark I read it as TS4543 - but the nameplate's been
bashed about a bit so I'll take a closer look today in daylight !
I suspect then that (assuming both above correct) that it will
use a start winding with a centrifugal (spelling??) switch. I guess the
contacts have gone and not powering up the start winding. Follow that bit of
metal coming off the live terminal post, think you may find something there.
Right !
When the motor worked, there was a definite 'clunk' as it spun up to
speed - that would have been the centrifugal switch, perhaps ??
Hope I have helped a bit!
Yes thanks !
Now I need to get 'inside' this motor to see what's going on.....
The only obvious things I can see holding it all together are the four
long bolts - unless there's something clever holding the covers on
underneath the mounting feet - I'll have another look & report back...
Many thanks - I missed your post last night and it wasn't unti some
kind soul pointed it out that I read it.....
Thanks
Adrian
======return email munged=================
take out the papers and the trash to reply
|