In message , John Rumm
writes
Tim Lamb wrote:
In message , John
Rumm writes

The motor start cap on my chip collector seems to be a tiny bit
dead. Anyone know where I can find something similar to a CD60 cap,
100 uF, 250V AC or better. Size wants to be something in the order
of 35mm diameter and 80mm tall to fit in the bulge on the case.
Umm... have you checked the windings?

Yup, it runs ok if I give it a spin to get it started. I do have two
doubts however. When disassembling it today I did notice that the
stator winding had slight discolouration in a couple of places that
suggests it might be getting hot. There was a binding string that was
wrapped round the bundle of enamelled copper wire at the top, that
looked like it may have been burnt through in a couple of locations.

The other one was I could not hear the centrifugal switch clicking out
as the revs spun up or down. It seemed to move freely by hand however.
I am sure in the past I used to hear it click in and out at at spin up
and down.

Umm again:-)

It is a very long time since I knew anything about any of this but 100uF
for a 1hp motor sounds excessive. The motor rewind people will know.
AFAIR the start winding has more turns of a lower resistance than the
main so may be apparent from the wire gauge.

Permanently connecting something designed for intermittent operation
sounds like a cooking recipe. You can get enough speed to operate the
switch by wrapping a few turns of string around the shaft and pulling.
Disconnect first:-)



I acquired a chip collector (2.2kW s/ph.) on the basis that the
capacitor was duff but the motor might be OK. Trying it with a
*borrowed* capacitor was disappointing. It ran but very noisily.

This is a SIP twin bag jobbie with 1hp motor. Not that old - three
years perhaps.

Age wasn't the issue. The previous owner had installed it out of sight
and allowed the system to overfill: stalling the fan.

regards



--
Tim Lamb