Rewinding a Small AC Motor

[granddad]

MM Yes Thanks.. not quite Zero yet . been keeping up with most posts , have to limit my comments to one a day
Perhaps I can hijack your thread and wish all ETO members a Happy and prosperous New Year. GD

 

[Musicmanager]

Hi Guys

A bit of an update on the motor rewind ... .. .. ..

Yesterday, I managed to get the leads soldered and insulated for the winding ends and then wrapped and refitted the coil to the stator. I had some difficulty getting the coil to maintain the shape required to clear the commutator but the coil eventually decided that of the two of us I was the more stubborn, and I then got to soak the new half of the stator in a plastic tray full of air drying xylene varnish. After an hour or so, I removed the coil from the tray and suspended it to drain off and drip dry overnight.

Today, I re-assembled the motor and plugged it in .. .. to my amazement it didn't explode, but it didn't turn either, just emitted a very loud hum. I reversed the brush connections on the new coil, re-assembled and it all leapt into life.

I've now re-assembled the machine and it all works, including the speed control, which my tacho measures between 3500 and 8000 rpm.

As Hannibal once said ' I love it when a plan comes together ! ' I'm chuffed to bits at having achieved this repair ... .. Thanks for all your help.

S

 

[jpanhalt]

Can you draw an arrow to the side you made? Otherwise it is impossible to evaluate the quality of your work.

Well done.

John

 

[MaxHeadRoom78]

Congratulations, it sounds like you had the field polarity both connected for the same pole, we used to power the windings with low voltage DC and confirm the polarity with a compass.
Max.

 

[granddad]

MM Nice work,. never doubted you could do it , G

 

[Musicmanager]

Hi Guys

I wanted to round off this thread with a little information some members might find useful.

It was always my intention to use this circular saw for PCB cutting to size. It is very small .. .. 240mm x 200mm and uses 50mm blades which are available in a variety of metals and tpi's. I was, however a bit concerned when some members voiced concern over 'flying swarf ' when cutting PCB's.

I waited to be sure of a successful repair before buying a 24 tpi, Tungsten Carbide blade which arrived yesterday and was fitted to the saw last night.

I have to report a fine, clean cut and the debris is mostly fine dust that collects in the dust trap, under the blade quite nicely. Of course, there is a possible health risk related to inhaling the FR 4 dust, so a face mask in addition to the obligatory safety spec's is essential equipment, but on the whole the results are great.

S