Tips Replacing Chinese Fan Motor Fuses?

[KenO]

Recently inherited 2 non working 16" Chinese Fans with blown motors. A while ago I was successful in repairing another blown Chinese fan motor.
https://groups.google.com/forum/#!searchin/sci.electronics.repair/KenO/sci.electronics.repair/msWvpKYBh-I/4MZ5nJNMXAcJ

Hope to simplify the repair so wonder if anyone has tips about replacing fan motor fuses with no or minimal disassembly of the motor?

Also can post photos of the 2 new fan motors if want.

Thanks

Ken

 

[Cydrome Leader]

KenO <kenitholson@yahoo.com> wrote:

Recently inherited 2 non working 16" Chinese Fans with blown motors. A while ago I was successful in repairing another blown Chinese fan motor.
https://groups.google.com/forum/#!searchin/sci.electronics.repair/KenO/sci.electronics.repair/msWvpKYBh-I/4MZ5nJNMXAcJ

Hope to simplify the repair so wonder if anyone has tips about replacing fan motor fuses with no or minimal disassembly of the motor?

when my last window box fan failed, I checked the motor and found the
thermal fuse was blown and the bearings gummy.

I didn't bother to get the tiny fuses off ebay and just used the
"standard" sized metal body fuse as seen in normal appliances instead.

the thing wasn't even glued in to the windings or hard to get at. These
motors are so crappy now that they're actually easy to take apart.
Properly varnisning the windings just costs too much or something.

It will last a few more years until the crappy steel bearings wear out
completely.

 

[N_Cook]

On 17/08/2014 05:20, Cydrome Leader wrote:

KenO <kenitholson@yahoo.com> wrote:
Recently inherited 2 non working 16" Chinese Fans with blown motors. A while ago I was successful in repairing another blown Chinese fan motor.
https://groups.google.com/forum/#!searchin/sci.electronics.repair/KenO/sci.electronics.repair/msWvpKYBh-I/4MZ5nJNMXAcJ

Hope to simplify the repair so wonder if anyone has tips about replacing fan motor fuses with no or minimal disassembly of the motor?

when my last window box fan failed, I checked the motor and found the
thermal fuse was blown and the bearings gummy.

I didn't bother to get the tiny fuses off ebay and just used the
"standard" sized metal body fuse as seen in normal appliances instead.

the thing wasn't even glued in to the windings or hard to get at. These
motors are so crappy now that they're actually easy to take apart.
Properly varnisning the windings just costs too much or something.

It will last a few more years until the crappy steel bearings wear out
completely.

Perhaps 20 and 30 years ago I witnessed 2 different window fans catching
fire, in different places. Before the days of Chinese imports , I
assume, and perhaps no fuses in them in those days. Unlike equipment
fans a very high power density ,requiring the fan action to keep the
motor cool and if mechanically stopped for some reason, soon heated up
to combustion level. What temperature thermal fuses are used?

 

[Cydrome Leader]

N_Cook <diverse@tcp.co.uk> wrote:

On 17/08/2014 05:20, Cydrome Leader wrote:
KenO <kenitholson@yahoo.com> wrote:
Recently inherited 2 non working 16" Chinese Fans with blown motors. A while ago I was successful in repairing another blown Chinese fan motor.
https://groups.google.com/forum/#!searchin/sci.electronics.repair/KenO/sci.electronics.repair/msWvpKYBh-I/4MZ5nJNMXAcJ

Hope to simplify the repair so wonder if anyone has tips about replacing fan motor fuses with no or minimal disassembly of the motor?

when my last window box fan failed, I checked the motor and found the
thermal fuse was blown and the bearings gummy.

I didn't bother to get the tiny fuses off ebay and just used the
"standard" sized metal body fuse as seen in normal appliances instead.

the thing wasn't even glued in to the windings or hard to get at. These
motors are so crappy now that they're actually easy to take apart.
Properly varnisning the windings just costs too much or something.

It will last a few more years until the crappy steel bearings wear out
completely.



Perhaps 20 and 30 years ago I witnessed 2 different window fans catching
fire, in different places. Before the days of Chinese imports , I
assume, and perhaps no fuses in them in those days. Unlike equipment
fans a very high power density ,requiring the fan action to keep the
motor cool and if mechanically stopped for some reason, soon heated up
to combustion level. What temperature thermal fuses are used?

I think I just grabbed a 128C thermal fuse, which was higher than the
original by 5 or 10 degrees or something like that, but the closest match.

I do recall a window fan fire, but it was in a very old 1970s or 1980s
made in USA model. The bearings must have seized up, there really isn't
much else to go wrong with those things.

Windows fans seem to large to ever be impedance protected, plus doing that
must cost more than a fuse sort of pushed into the gap between windings
and the stator.