I have an antique table fan. When power is swtiched on the motor produces
humming sound. The propeller does not turn even after giving a spin in the
clockwise direction. A great force is holding on to the rotor.
However, when fan is turned in the anti clock wise direction maually it
starts to spin with a slow speed.
I have changed a new capacitor but the problem persists.
What could be the issue?
Any help and pointers appreciated.
Was the fan running ok previously while in your posession?
If so, and if nobody screwed around with the motor wiring connections
since then I'd hazard a guess that there's an internal short between the
two stator windings
That's not too easy a thing to fix without some experience in motor
rewinding, and the proper tools and supplies.
Thanks Jeff for your inputs and time.
Yes the 230V AC table fan was working fine till recently. It gradually
slowed over time. Only the highest speed worked in its last week of
operation then it came to a stop.
Now the rotor turns easily with a minimum force when no electrical power
is applied. Once power is switched on the rotor's mechanical motion gets
really hard in the forward direction. I reckon this happens due to the
magnetic field that is generated by the current flow. However
Since the motor can turn in reverse direction can I conclude that the
mechanical condition of the motor is OK. Only the winding is screwed up
and it needs to be replaced or rewired.
Any one has pointers how to rewire the stator. Its going to be a messy
and tough job.
Around the 9th grade, I had no money for extras, so the only Erector
Set motor I had (besides the wind-up one) was the one my class-mate
gave me that was broken.
I had no money for wire either, and wouldn't have known where to buy
the stuff. So I unwound the old winding looking for the problem.
Every coil of wire broke off from the next one, into 4 pieces iirc,
one for each side of the rectangle.
So I had at least 100 pieces of wire. I scraped the enamel off of
each end of each piece, and hooked each piece to the next piece,
because there woudln't be space enough to do a bulkier job. I wound
it all up adn wrapped it with cloth, and it worked! Pretty well.
But after a while it started to smoke. Why? Because the cloth I
wrapped it with was cloth electric tape. Friction tape. With
adhesive. One thing we had plenty of was rags. I came so close to
fixing it right.
Never did see a particular problem, iirc, that caused it not to work
Dried up lube? With the fan turn off, how easily does the fan spin?
Should spin very easily.....if not, sounds like a mechanical issue.
DIsassemble, clean (mild solvents), lube lightly & re-assemble.
How about a photo?
I have two non-antique fans that have to be on for a minute to 10
minutes before they warm up enough to spin.
I have an antique fan, that my father used in his office unti l953,
that I used until about 1993, that needed oil, but eventually I took
it apart and couldn't seem to align the front and rear bearings. Even
thought they're both mounted in spheres and are self-aligning, they
just don't move enough.
This is why Jeff said what he did. I have no experience with this.
the latest post on this that I can see claims "the fan only worked ON ITS
HIGHEST SPEED during the last week of life......................Did anyone
think to check the speed selector???? a shorted contact mabey??
just a thought.
can the OP post a closeup pict or diagram of the switch?
Since it is an antique, just a wild thought. If the fan is AC/DC
compatible, it might actually have a DC motor with rectifier in the
circuit. If the diode or diodes have died, might that be causing the
condition you describe?
Are there really any AC/DC home appliances left in the wild? (Other than
maybe in the storage rooms of the oldest buildings in NYC and a couple
other cities?) How many decades has it been since Mains DC was even
available for anything other than elevators and subways?
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