Rewinding a Retarder

[bkg]

Has anybody played with a telma retarder, more to the point the coil packs, or rewound coils at all, this retarder needs all off them rewinding only 4 work, and before anybody starts, will try and do it myself its not rocket science to wrap wire around a mandrel just wanted some pointers please

 

[Hilly]

Has anybody played with a telma retarder, more to the point the coil packs, or rewound coils at all, this retarder needs all off them rewinding only 4 work, and before anybody starts, will try and do it myself its not rocket science to wrap wire around a mandrel just wanted some pointers please

I’m no help sorry but I’m interested to even know what the hell is it ?

 

[davidroberts30]

No experience so take this how you will
Imo you need to count the turns of wire so you can refurb them ?

 

[bkg]

I’m no help sorry but I’m interested to even know what the hell is it ?

https://www.telma.com/
bit of reading for you hilly but basically a electric brake.

 

[Cowcalf]

if you can spin them at a known speed then wire on for number of seconds to get required revolutions , make a neater job than putting on by hand so long as you keep revs at nice speed

 

[bkg]

if you can spin them at a known speed then wire on for number of seconds to get required revolutions , make a neater job than putting on by hand so long as you keep revs at nice speed

There wound with 2mm aluminium wire so not masses of wire but insulating is what i see a bit of a problem as coated in some thing.

 

[Mursal]

If you stagger the working 4 will that be adequate, or is it on a working truck,

 

[bkg]

If you stagger the working 4 will that be adequate, or is it on a working truck,

Good old Mursel /// you no what i am on with, are he says but the problem is, 3 at one side and one at the other side work, and you can't get the coils of to swop about.

 

[TripleSix]

What's it off.
A mate just scrapped a Merc sprinter ambulance which was fitted with one, I'm sure he kept the retarder

 

[bkg]

What's it off.
A mate just scrapped a Merc sprinter ambulance which was fitted with one, I'm sure he kept the retarder

Bus
don't think there big enough of the merc, but go and find out the size please ,or model might do the job and i'm not to far away from you, might be worth a try. Could be a cc80 ? on the Merc. You will need to measure the rotor diameter 340mm ?

 

[rick_vandal]

Bus
don't think there big enough of the merc, but go and find out the size please ,or model might do the job and i'm not to far away from you, might be worth a try. Could be a cc80 ? on the Merc. You will need to measure the rotor diameter 340mm ?

Is the rotor plain ally for the eddy currents to mingle or are there shorted bars like a squirrel cage?

 

[bkg]

Is the rotor plain ally for the eddy currents to mingle or are there shorted bars like a squirrel cage?

rick_vandal
You must know a we bit about these retarders ?

 

[Netherfield]

I hadn't realised they still made them. I believe initially there were problems getting rid of the heat produced, especially on coaches and buses.

 

[rick_vandal]

There wound with 2mm aluminium wire so not masses of wire but insulating is what i see a bit of a problem as coated in some thing.

Enammelled copper wire would work. Are adjacent coils wound contra?

 

[bkg]

Got 2mm aluminium wire coming tomorrow a cheap coil winder of ebay, think all the coils are wound the same way well the parts listing are all the same number, were it does differ is how you wire them up, ie very start of the windings are + and end of windings - and opposite coils are the other way round.

 

[AWJ26]

Always fancied making a frame for the front linkage to carry a retarder and connect it to the front PTO. Save on the tractor brakes!

 

[bkg]

like so ?

 

[Sharpy]

Always fancied making a frame for the front linkage to carry a retarder and connect it to the front PTO. Save on the tractor brakes!

Would you maybe be better putting it on the 4wd shaft?

 

[Sharpy]

like so ?

If thats the plan could you put some batteries somewhere and make the tractor a hybrid?

 

[milkloss]

I could be barking up the wrong tree but a while back I watched a YouTube video of some guys using one of these to build a dyno for cars. They has to rebuild the retarder as well, not sure if they covered it very well In the video though.