Stacking toroids - Ok? - Page 3

skaara · 9th September 2002, 06:16 PM

Ill try to stack (fused!

) 1.5kW ones when i get the chasis, ill report the results

hifiZen · 10th September 2002, 09:20 AM

Leroy:

the only reason the leakage flux is low is bacause the core has a high magnetic permeability, while the surrounding materials (air, mainly) have a low permeability. The magnetic flux takes the "path of least resistance" and stays in the core. BUT... stack a nice big chunk of grain-oriented silicon steel (eg, a second transformer) right up against it, and you're going to have some flux in that other piece of iron. It will all depend on how close physically the other core is. I've never tried it myself, but I guarantee, there will be some coupling. How much... ? Dunno. Like I said, it will depend on how closely coupled that second core is. Try the following experiment: stack two toroids, and connect the primaries of the first to mains voltage. Then, check to see what voltage appears on the other transformer's coils... without other circuitry connected, you'll be able to see the effect of the flux leakage.

I still maintain that to avoid unnecessary heat generation, and for optimum channel isolation, you want those bad boys separated. At least make sure there's some spacers in between them..

The Saint · 10th September 2002, 11:10 AM

Stacking Toriodals is no problem, The magnetic field in the core is very tight , only a 2mm rubber insulator between each core is needed. You will have no problem with cross-coupling.

Regards

Anthony Holton
Aussieamplifiers

DieterD · 11th September 2002, 05:40 AM

I have stacked 4 tiroidals, two on top of each other, and these twins next to each other, producing + - 70 volts (rectified) and we use it to run a 300 watt disco amp, runs all night flat out and we have to date had no problems. I did not even bother to separate them with rubber washers etc.
I will check next time they have run for a few hours to see if they produce any major heat.

DieterD

9th September 2002, 06:16 PM	#21
skaara diyAudio Member Join Date: Jun 2002 Location: Europe, Slovenia	Ill try to stack (fused!) 1.5kW ones when i get the chasis, ill report the results

10th September 2002, 09:20 AM	#22
hifiZen diyAudio Member Join Date: May 2001 Location: Mountain View, CA	Leroy: the only reason the leakage flux is low is bacause the core has a high magnetic permeability, while the surrounding materials (air, mainly) have a low permeability. The magnetic flux takes the "path of least resistance" and stays in the core. BUT... stack a nice big chunk of grain-oriented silicon steel (eg, a second transformer) right up against it, and you're going to have some flux in that other piece of iron. It will all depend on how close physically the other core is. I've never tried it myself, but I guarantee, there will be some coupling. How much... ? Dunno. Like I said, it will depend on how closely coupled that second core is. Try the following experiment: stack two toroids, and connect the primaries of the first to mains voltage. Then, check to see what voltage appears on the other transformer's coils... without other circuitry connected, you'll be able to see the effect of the flux leakage. I still maintain that to avoid unnecessary heat generation, and for optimum channel isolation, you want those bad boys separated. At least make sure there's some spacers in between them.. __________________ - Chad.

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10th September 2002, 11:10 AM	#23
The Saint diyAudio Member Join Date: Jul 2002 Location: Launceston, TAS, Australia	Stacking Toriodals is no problem, The magnetic field in the core is very tight , only a 2mm rubber insulator between each core is needed. You will have no problem with cross-coupling. Regards Anthony Holton Aussieamplifiers

11th September 2002, 05:40 AM	#24
DieterD diyAudio Member Join Date: Dec 2001 Location: Howick South Africa	I have stacked 4 tiroidals, two on top of each other, and these twins next to each other, producing + - 70 volts (rectified) and we use it to run a 300 watt disco amp, runs all night flat out and we have to date had no problems. I did not even bother to separate them with rubber washers etc. I will check next time they have run for a few hours to see if they produce any major heat. DieterD