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Old 17th April 2013, 06:43 PM   #181
Fuling is offline Fuling  Sweden
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EI-150 size transformers should be enough for almost any tube related projekt.
I remember winding a pair of EI-135/72 power transformers about a decade ago, they were huge.
My supplier only sells EI60 - EI108 transformer kits so that´s what I will design my spindle for.
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Old 17th April 2013, 10:02 PM   #182
AJT is offline AJT  Philippines
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EI-175 is the biggest that i wound on a winding machine, higher sizes i do manually since they are big and had fewer turns and easy to count....
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Old 26th April 2013, 08:03 PM   #183
TheGimp is offline TheGimp  United States
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Just thought I'd bump this.


No hardware progress in the past 10 days as I fried my Arduino. I'm not sure what happened as it was running fine stepping the shaft and then there was a slight snap sound followed shortly thereafter by the 3 terminal regulator spewing its guts.

The USB interface chip went so no sense in trying to fix it. The regulator probably dumped 12VDC on the 5V circuitry. It was not on the computer USB port at the time so no damage to my main computer.

I just wonder if the stepper is somehow putting transients on the power supply that managed to get through the regulator and damage the board.

If so, I need to add some transient suppression.

I built a new 8V pre-regulator (7808 with heat sink) to drive the Arduino from the 20V supply. So hopefully there will not be a repeat of the event.

A new one arrived yesterday so I can get back to checking code, which is almost at Alpha.

Code is up to 900 lines of which about 330 lines are code.

Hardware has not progressed other than digging out a couple of opto-interruptors.

Linear bearings have not arrived yet so I can't do much on the traverse mechanism.
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Old 26th April 2013, 09:01 PM   #184
Matt BH is offline Matt BH  United Kingdom
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Sorry to hear of your mishap. What chip is it on your driver board? It may or may not have in built catch diodes to catch the back emf. Great to hear that the project is coming along well, will you post your code once finished? I would be interested in using it to modify my cludge of a winder. I would keep my DC spindle motor and add an encoder though.

Keep up the great work!

Cheers Matt.
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Old 27th April 2013, 02:09 AM   #185
TheGimp is offline TheGimp  United States
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The stepper has catch diodes on it, but I'm not convinced transients didn't get to the Arduino.

I'm using an L298 stepper controller like this one:

Stepper DC Motor Driver Board L298N Controller Module Based on L298N | eBay

I'll post the code now if anyone wants to look at it.

Although I'd rather wait till I get it working with the steppers and position sensors so I can get it debugged.
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Old 28th April 2013, 04:37 AM   #186
TheGimp is offline TheGimp  United States
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Opto-Coupler and Interrupter in place on the shaft.

The shaft is hardened to some extent, much more so than water harden drill rod. I busted off a 6-32 tap tonight tapping the hole for the screw to hold the interrupter in place.

It was a bugger to get out and re-tap and I spent most of the evening working on it but finally was able to clean it out and finish tapping it. I should be able to start on the buffer tomorrow, and begin testing the turns counter (redundant to the stepper count).
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File Type: jpg Interrupter.JPG (174.7 KB, 179 views)
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Old 28th April 2013, 05:11 AM   #187
Tyimo is offline Tyimo  Hungary
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Hi!
What would be the best winding method for a bifilar 1:1 interstage transformer?
Greets:
Tyimo
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Old 28th April 2013, 05:03 PM   #188
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The best....

Explain first what bandwidth you want, for which tube(or Ra), PP or SE and how low you want copper losses and core losses?

There is no "the best" if you not know what the design goal must be.


Quote:
Originally Posted by Tyimo View Post
Hi!
What would be the best winding method for a bifilar 1:1 interstage transformer?
Greets:
Tyimo
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Old 28th April 2013, 09:44 PM   #189
TheGimp is offline TheGimp  United States
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The heatsink on the stepper controller is way too small. I guess it is good for 3 or four watts max. If I am runing two motors at 2A each per winding with two windings, that is approaching 24W dissipation (figure 3V drop on the H-Bridge switches).

Question is whether use another heatsink, or find a way to mount it to the al plate and use it to carry away the heat.
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File Type: jpg HeatSink.JPG (218.5 KB, 151 views)
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Old 29th April 2013, 07:38 AM   #190
Tyimo is offline Tyimo  Hungary
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Quote:
Explain first what bandwidth you want, for which tube(or Ra), PP or SE and how low you want copper losses and core losses?
20Hz-20KHz, 6N6P, Ra 1800 Ohm, SE, But the winding should be bifilar!
Greets:
Tyimo
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