Rewinding motors ?

[sardine]

Anyone know anything about rewinding stators on basic brush motors ?


I have one of these Henry vacuums with a bad stator but good rotor, I unwound it and its 150 turns of 0.8 / 0.9 wire, I might give it a go as I can only lose a reel of enamelled wire ?

 

[Chippie]

Ensure you count the number of turns and the wire gauge is correct…This affects the Amp-turns of the mag field.( it’s not going to make a great difference, but if you’re going to do it, do it right…)
Ensure that when you wind the new coils, they are wound the same direction as original, mark the start and end of each, connect as originally, else it will run the wrong way..

 

[Anguz]

how much are new ones ?

 

[frank horton]

£25-50 squids....

 

[500e]

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Some places double

 

[angellonewolf]

Buy a 2nd hand one they got for 30 quid on facebook

I like play time and trying to fix stuff but sounds like a lot of work and potential to have a rotating object fly out of a plastic housing

 

[MetalMonkey]

I'm curious to know what went wrong with the winding - I had an issue with one of these too.

If yours is aluminium and rewinding with copper this will also be a factor.

https://www.mig-welding.co.uk/forum/threads/aluminium-windings-on-henry-numatic-motor.136266/

 

[Chippie]

Aluminium has 1.7 times the resistance of copper, so you need less copper for a new wind, go figure…
You can either go by weight or length…
So, 1000m of aluminium versus 1000m of copper, will have 1.7 times more Ohms at around 20 degrees C

You could weigh the unwound ally, then calc from that the amount of copper needed, or measure the length…
I once rewound the rotor from a diesel genny that had ally windings, wondering why it wouldn’t solder!… I rewound it with copper, based on the length of 1 turn of wire multiplied by the number of turns….took something like 1100gm per pole…Worked like a charm when put back together….but I digress…

 

[Erie Fred]

Buy a 2nd hand one they got for 30 quid on facebook

I like play time and trying to fix stuff but sounds like a lot of work and potential to have a rotating object fly out of a plastic housing

I think the rewinding is to take place on the stationary part.....

 

[sardine]

I'm curious to know what went wrong with the winding - I had an issue with one of these too.

If yours is aluminium and rewinding with copper this will also be a factor.

https://www.mig-welding.co.uk/forum/threads/aluminium-windings-on-henry-numatic-motor.136266/

Yes it was aluminium and the same problem, the end that is the first winding that clips into the connector was broke off , when I unwound it there erew 3 breaks in the wire as well.

 

[sardine]

how much are new ones ?

I'm looking at it as a project to learn how to rewind a stator and see what happens, if I have to buy a new motor then I might as well chuck it.

 

[minimutly]

We lost a 250kW generator today, direct coupled to a Pelton turbine. Fingers crossed it hasn't eaten itself....

 

[MetalMonkey]

Yes it was aluminium and the same problem, the end that is the first winding that clips into the connector was broke off , when I unwound it there erew 3 breaks in the wire as well.

That's very, very interesting.

I've been told by a numatic repair specialist that this fault is rare but does happen and they aren't sure why. The head of quality control at numatic initially requested a lot of info, but has been radio silence since, despite repeated requests to him for an update by their customer service team. I can't help but wonder if they were originally copper wound and were "cost engineered". I've been tempted to rewind mine, but I feel like it's probably not going to be worth the effort.

 

[6ply]

I think the rewinding is to take place on the stationary part.....

Good point.

Stator = stationary
Rotator = rotates

 

[6ply]

I'm looking at it as a project to learn how to rewind a stator and see what happens, if I have to buy a new motor then I might as well chuck it.

When I used to live abroad in a not so developed country, there used to be women working from the side of the road who would rewind motors all day long. Very knowledgeable and skilled people.

Let us know how it goes.

 

[Chippie]

I'm looking at it as a project to learn how to rewind a stator and see what happens, if I have to buy a new motor then I might as well chuck it.

Rewinding the field is a lot easier than rewinding an armature…I can tell you….

 

[Turbo]

Chuck the Henry & acquire another, not worth the hassle when you can get a used one for very little £ or even free.

At the last count I had 7 henrys plus 2 with knackered motors that serve as parts doners for the rest.

 

[waddycall]

I don’t get the comments about it being cheaper to buy a new one. Surely everyone on here enjoys a bit of a challenge

 

[angellonewolf]

I don’t get the comments about it being cheaper to buy a new one. Surely everyone on here enjoys a bit of a challenge

if you got the time im sure its rewarding to get some thing broken working again i understand that

on the otherhand parts 2nd hand for henrys are plentfull and so are broken mechines a lot are thrown because of a broken power lead or power switches as theres not much to them better off picking up another broken one thats lighly an easy fix and replace the head and get it working again for little time and effert

 

[dobbslc]

All the scraped Henry's I've saved have had a broken cable at the rewind coil end or a knackered switch.
So worth finding one one Fatbook to butcher.