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Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
I have a 3 phase variable transformer with a 2 phase 2 pole servo motor driving the stack. My question is, does anyone know if this can be wired to run on a single phase? I took a photo of the diagram on the side, it shows a series and parallel connection.
It is currently connected in series. Is this usable at all with single phase?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yup, just connect one phase to the line directly, and the other phase via a capacitor to provide a 90' phase shift. To reverse the motor, swap them over. The series and parallel options are presumably to let the motor run off either 120V or 240V line.
It's designed so you can wire it up with a momentary centre-off switch for "increase" and "decrease".
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Thanks heaps Steve for the answer. The motor is rated at 100V so i'm not sure about the series parallel theory being for 120V or 240V, but you would know more. I'll try it in the series mode as that is what it's set at. I found it strange that it had a 100V motor in it as it came from a battery charging circuit (Telecom I think), and we use 240V here. I will use a step down transformer for it if your theory isn't right. On that train, would a series connection enable 240V connection (theoretically). I had the momentary switch thing worked out for it as the diagrams all show two switches, so I gathered it was forward and backward. Any idea what size capacitor I should use for it? or doesn't it matter as long as it's not too small? It is rated at either 1 or 7 watts, the stamping is rough. I think it is 1, but that seems small to me. The shaft on the variable transformer takes no effort to turn though, not like a normal vari xfmer.
Edit. I got it working using a 2.2uF cap, scared to use a higher voltage though. Will use a stepdown transformer with it.
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2Phase servo motor driven by single phase
