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Old 22nd April 2013, 07:21 PM   #11
Jim W is offline Jim W  United States
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Quote:
Originally Posted by amt View Post
... the size has to do with
proper creation of the sinewaves that arent "gutless". (apparently, wimpy sine waves are to had with smaller transformers)
amt
I don't remember "guts" or "gutless" being a parameter from my power electronics classes. But I'm guessing guts is being used to describe the low impedance of the transformer and the fact that it won't sag a bit when it's being used to power a few watt motor. However, that's made irrelevant by the series resistor.

It was probably a typical nuanced engineering decision - "Hey Bill, I think I figured out what to do with that pallet of toroids in the warehouse..."
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Old 22nd April 2013, 08:02 PM   #12
amt is offline amt  United States
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Jim,

Comparing a 35VA geddon against the Valhalla would be quite interesting.

Ive not seen the resistor in the circuit sq225917 is using. What is its purpose?

In addition, the motor is 50hz and Im now wondering where to locate a 60hz pulley. Might have to turn one I guess.

amt
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Old 22nd April 2013, 10:22 PM   #13
Jim W is offline Jim W  United States
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I haven't seen the circuit that sq225917 uses, but was basing my comment off of Neil McBride's site and the schematic on this site:
Armageddon Clone

They use a resistor in series with the transformer to drop the voltage supplied to the motor.
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Old 23rd April 2013, 05:34 PM   #14
amt is offline amt  United States
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Why use a resistor and not just utilize a transformer with appropriate secondaries? Why use 55-0-55 with resistance and not 50-0-50? Does the
transformers impedance come into play?

I was considering this:

Antek - AN-4450

Here is sq225917 version:

YYYYYY | Flickr - Photo Sharing!

amt
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Old 23rd April 2013, 05:49 PM   #15
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I don't use a resistor in mine I run the motor on a full fat 110 volts. Some people like to drop the voltage on one phase as they think it quietens the motor, some like to drop both because they think less torque = less noise. I just did the sensible thing, kept on tweaking the nominal value of the capacitor until I hit the value with the lowest vibration for my motor and then I dropped thick oil in the bearing, the added drag helps collapse the field in the motor and reduces/all but eliminates the effects of cogging. YMMV, i know my current deck has better measured speed stability than my SME had, that's good enough for me.
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Old 25th April 2013, 09:21 PM   #16
Bibio is offline Bibio  Scotland
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what about a simple 12v power supply using a transformer then bridge rectifiers to create 12vdc then modding a dc/ac inverter as the inverter must have a 50hz/60hz frequency generator in there somewhere so might just be a simple case of swapping out the frequency generator for something more suitable.
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