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Tony's latest traffo DIY build
Tony's latest traffo DIY build
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Old 10th October 2017, 08:37 AM   #961
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by saminnografix View Post
sir tony may i ask if i can get 1500VA on the following toroid?
OD = 8"
ID = 3"
H = 6cm
i do not have a concrete formula on toroid...

thank you
sam
Try winding on a part of your proposed primary.
Say 200turns and then test it via a Variac to see how much current passes through that primary winding.
Plot the Ip vs Vp curve and see the typical "S" shape. Determine the maximum voltage that 200T primary can take without getting too hot (high current).

From that you can work out how many primary turns you will need to react againt the MAXIMUM voltage you have at home.
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Old 10th October 2017, 09:35 AM   #962
saminnografix is offline saminnografix  Philippines
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thank you so much sir...
GodBless...
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Old 13th October 2017, 04:40 AM   #963
TonyTecson is offline TonyTecson  Philippines
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Tony's latest traffo DIY build
500 VA isolation traffo for my bench top...230 volt primary to 0 to 100, 115, 230 volt secondaries...
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Old 14th October 2017, 05:55 AM   #964
TonyTecson is offline TonyTecson  Philippines
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Tony's latest traffo DIY build
with end bells installed....

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Old 14th November 2017, 07:48 AM   #965
saminnografix is offline saminnografix  Philippines
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Default traffo

sir tony may i ask another proposed project.

2"CL x 5" weight about approx.15.2 kg
prim. #14 AWG 230v @0.8t/v = 184t
sec. #11 AWG = 60Vac -0- 60Vac

thanks sam
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Old 14th November 2017, 08:11 AM   #966
TonyTecson is offline TonyTecson  Philippines
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Tony's latest traffo DIY build
calculate if your chosen wires will fit inside the 1 in x 3 inches winding window...
way i look at it, more like #15 primary and #12 secondary...
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Old 14th November 2017, 08:38 AM   #967
saminnografix is offline saminnografix  Philippines
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Quote:
Originally Posted by TonyTecson View Post
calculate if your chosen wires will fit inside the 1 in x 3 inches winding window...
way i look at it, more like #15 primary and #12 secondary...
i thought that too but first, are my computations possible (power:core) ratio?
secondly the way i look at it as i have samples of number 14 wire
in a window of 1"x3" less the bobbin roughly i would take 7/8 x 2 3/4 allowable winding area, so based on actual #14 magnet wires can turn up to 38 in a 2 3/4 bobbin size. I multiplied 38 x 5 = 190, and 5 turns of #14 occupies about 3/8 of an inch.
next the available window left was 1/2 x 2 3/4 unfortunately i do not have #11 sample but as i look into your table turns per linear inch
enamel D.S.C. or S.C.C. D.C.C
#14 15.0 14.20 13.8 i used 14 turns per linear inch as presumption = it works
#11 10.7 10.3 9.8 i used 9 since i do not have sample to compare with.
the bottom line here are my interpretation and calculations based on your table correct?

thanks
regards
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Old 14th November 2017, 09:02 AM   #968
TonyTecson is offline TonyTecson  Philippines
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Tony's latest traffo DIY build
the coil build up is what we look at, if that fits then you can go...

#14 has a diameter of 1.63 mm
#11 has a diameter of 2.3 mm

so how many layers for primary?
how many layers for secondary?
this will guide you to make the final decision...
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Old 14th November 2017, 09:21 AM   #969
saminnografix is offline saminnografix  Philippines
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Quote:
Originally Posted by TonyTecson View Post
the coil build up is what we look at, if that fits then you can go...

#14 has a diameter of 1.63 mm
#11 has a diameter of 2.3 mm

so how many layers for primary?
how many layers for secondary?
this will guide you to make the final decision...
ok sir thank you for the quick reply
i used english system as i saw it on your table

using metric 25mm x 75mm
#14 actual size at hand was 1.83 into (75mm) 70mm on bobbin 70/1.83 x 5 layers = 191 turns
5 layers x 1.83 = 9.15 or 10mm
for #11 i used the next size guide say for example 2.7mm
#11 @ 2.7mm into a 70mm area will allow 25turns per layer, it needs about 4 layers that will also occupy 10.8mm
that is 9.15 + 10.8 mm = 20mm

by the way i am ordering #11 wire sample to have final measurement.

thank you sir.
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Old 14th November 2017, 09:32 AM   #970
TonyTecson is offline TonyTecson  Philippines
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Tony's latest traffo DIY build
20mm is too tight, remember that calculations do not take into account winding factor,
if your calculations give you 20 mm as build up, do not count that that will be the actual buildup once you start winding, that is why i always end up with one size lower, better safe than sorry...

but if you can squeeze them in, why not? use mandrels and a big vise to flatten the coils so it fits...or g-clamps cam be used...
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