I successfully rewound a small 12v d.c.. motor from my MG midget.
I am now attempting to rewire the stator of the 240v single phase induction stator with 150 micro farad , from a garden shredder uk.
I have completely stripped it all down.
I have counted all the windings & recorded the wire dias.
I have produced a devoped coil diagram.
Is there a list of standard wiring configurations or is it limitless as I could not record the pin outs ( external connections )?View attachment 301363View attachment 301363

 

 

Sorry about the duplications

 

Is that a two pole motor? (i.e. just under 3krpm?)

 

Hi..Thanks for engaging..
I am no motor engineer..but I guess yes..I didn't realise that the no. of poles had a correlation to the r.p.m.

 

This is details for a four pole, the two pole can be same sequence.

 

Thanks for that..you are the only respondant!!..as you can see.
a) So I connect simply in accordance with figs 2-6,8 & 9 ?
b) May I assume that the start coils on my motor are the 0.5mm dia.?...I have an amount of 0.45mm dia from my last project, can I use that ?, what about the turns!?
c) Do I assume from the schematics that the run coils are all in series, & similarly the start coils?
d) What is the significance of the contra flow arrows on the coils on the figs. please?
e) You may note that there is some discrepancy in the turn count on my diags. is this critical?

Yours gratefully..Malcolm

 

Very important to count the turns of each coil as well as gauge.
I used to make a winding spool based on the dia of the existing coils.
The arrows on the windings indicate the relative coil winding current rotation.
It is wise to obtain Presspahn or similar lining for the slots.

 

"Very important to count the turns of each coil as well as gauge".....
...a) Agreed but how critical..ie...%?
"I used to make a winding spool based on the dia of the existing coils"....
...b) Ideally yes, but one can't measure the effective dia ( approx if it's all bashed over & still in the slots.)..are you saying one should ideally remove them whole! I have great patience, so I will winng them manually on a board with 4 strategically placed headless nails Indian fellow on Utube made trial loops, which he adjusted (single turn) then several turns for effect, before making the finale coils..as he did not have the original form.
"The arrows on the windings indicate the relative coil winding current rotation"...
...c) So I may disregard them then?
"It is wise to obtain Presspahn or similar lining for the slots".,
...d) agreed plus sleeving, varnish, tie cord ect...& is it essential to insulate spray the laminations prior to coil insetion?

a) So I connect simply in accordance with figs 2-6,8 & 9 ?
b) May I assume that the start coils on my motor are the 0.5mm dia.?...I have an amount of 0.45mm dia from my last project, can I use that ?
c) Do I assume from the schematics that the run coils are all in series, & similarly the start coils?
Malcolm

 

a) Correct
b}The run winding is the larger gauge, the start winding is usually placed near the top of the stator core.
c) yes

 

GREAT..but what about?..
[/QUOTE]
Very important to count the turns of each coil as well as gauge".....
...a) Agreed but how critical..ie...%?
"I used to make a winding spool based on the dia of the existing coils"....
...b) Ideally yes, but one can't measure the effective dia ( approx if it's all bashed over & still in the slots.)..are you saying one should ideally remove them whole! I have great patience, so I will winng them manually on a board with 4 strategically placed headless nails Indian fellow on Utube made trial loops, which he adjusted (single turn) then several turns for effect, before making the finale coils..as he did not have the original form.
"The arrows on the windings indicate the relative coil winding current rotation"...
...c) So I may disregard them then?
"It is wise to obtain Presspahn or similar lining for the slots".,
...d) agreed plus sleeving, varnish, tie cord ect...& is it essential to insulate spray the laminations prior to coil insetion?

I also note on Utube that adjacent coils have reversed direction winding..

 

We used to use a cold chisel to shear off one end of the coil, then drive the rest of the winding out with a drift, this enabled obtaining a fairly accurate size for the winding former,

 

We used to use a cold chisel to shear off one end of the coil, then drive the rest of the winding out with a drift, this enabled obtaining a fairly accurate size for the winding former,

Yes I should have been more carefull...I made a "pig's brakfast" of removal as the pic, showed...hey ho.
Sooo adjacent coils are reverse direcion ?..if I say it correctly..this is most important.
b) May I assume that the start coils on my motor are the 0.5mm dia.?...I have an amount of 0.45mm dia from my last project, can I use that ?, what about the turns!?

 

0.05 mm difference should not matter. Turns should be the same.

 

0.05 mm difference should not matter. Turns should be the same.

Thanks again for your dedication.
Btw as regards to the rotor, it consists of steel laminations, & obviously no commutator.
My question is ..
What would be inside it, if anything?..it doesn't affect a compass. AND what would be the consequence of NOT reversing alternating coil windings please?

Malcolm

 

The rotor is made up of imbedded conductors called a squirrel cage, these effectively act as shorted turns WRT the stator field.
The resultant current in these bars is attracted to the rotating field and attempts to follow it, it (rotor) and can only come within 4 or 5 cycles of the rotating stator field, and the reason for its name.
Asynchronous motor.
If you do not connect coils correctly, no rotation.

 

The rotor is made up of imbedded conductors called a squirrel cage, these effectively act as shorted turns WRT the stator field.
The resultant current in these bars is attracted to the rotating field and attempts to follow it, it (rotor) and can only come within 4 or 5 cycles of the rotating stator field, and the reason for its name.
Asynchronous motor.
If you do not connect coils correctly, no rotation.

Well...a big thankyou to you!!...without YOUR help I would not have had the ability to even consider investing money in the mats.to proceed..
"Faint heart never won fair lady", it is said.

Malcolm

 

Just leave the ability to swap the connections if it is found necessary !

 

Ooo-er......swop!!!???
What thickness 'paper'...?, I have located a supplier of 3 thicknesses.

 

Swap = Swop!
Which is the variant ?