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WorkshopChris
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What sort of power supply are you looking for?
Crater Creator
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A bog standard AC rectifier would get you near enough 120VDC.
Or just 4 diodes and a soldering iron.....
This one shows a capacitor as well if you want to get really fancy and have smoother DC:
Or just 4 diodes and a soldering iron.....
This one shows a capacitor as well if you want to get really fancy and have smoother DC:
WorkshopChris
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Just off the top of my head wont the ac voltage need to be around 85 /90v to get around 120v dc.
gaz1
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Hood
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Yes, about 1.4 x the AC voltage once smoothed I think.
Here are plans for a basic supply that a lot of people used for a power supply stepper motor drives.
http://www.campbelldesigns.com/files/power-supply-part-1.pdf
Something to test these with and see what I can make with them....
? lol
Hood
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I edited to remove a post that I made which was meant to be in another thread, I had two windows open at the same time and wasn't paying attention to where I typed
Ah now I see...that PDF is that for a 50 volt DC motor not 120 Volt?I edited to remove a post that I made which was meant to be in another thread, I had two windows open at the same time and wasn't paying attention to where I typed
But can I get them in the UK?
Hood
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Yes but you can just use the plans to get an idea how to make one but use a transformer with a secondary voltage of approx 85V so that once smoothed it is about 120v DC.
WorkshopChris
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Without getting to involved you will probably need to test each motor to see how it is configured. Some dc motors just want 2 wires L & N but most are normally wired to run with some type of driver circuit and may also have additional terminals for a feed back coil or tacho.
Crater Creator
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@WorkshopChris , I think the 1.4 figure is what you multiply 240V AC RMS by to get the peak voltage. So mains is 240*1.4 = 336V peak.
I don't know how you could get more DC out than AC you put in without some clever electrickery.
Just googled - I was wrong saying a smoothed full wave rectifier would do it - but a half wave rectifier would get you about 109VDC from a very simple circuit (one diode, one capacitor).
I don't know how you could get more DC out than AC you put in without some clever electrickery.
Just googled - I was wrong saying a smoothed full wave rectifier would do it - but a half wave rectifier would get you about 109VDC from a very simple circuit (one diode, one capacitor).
gaz1
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you need something like this
http://www.ebay.co.uk/itm/HX-PWM-AC...601705?hash=item1c5bf0f2a9:g:d0AAAOSwwbdWMyZh
the motors you have are treadmill motors
http://www.ebay.co.uk/itm/ROGER-BLA...006598?hash=item33c48e8506:g:6Y4AAOSwx2dYJPYt
http://www.ebay.co.uk/itm/REEBOK-ED...173138?hash=item237afbbb12:g:ewgAAOSwUKxYcTD8
http://www.ebay.co.uk/itm/HX-PWM-AC...601705?hash=item1c5bf0f2a9:g:d0AAAOSwwbdWMyZh
the motors you have are treadmill motors
http://www.ebay.co.uk/itm/ROGER-BLA...006598?hash=item33c48e8506:g:6Y4AAOSwx2dYJPYt
http://www.ebay.co.uk/itm/REEBOK-ED...173138?hash=item237afbbb12:g:ewgAAOSwUKxYcTD8
WorkshopChris
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Isn't rectified dc voltage higher than than the ac supply voltage.
You have me thinking now but i dont always trust my self this time of day due to pain killers.
That would actually be better....I have a few ideas for their use. One of which is to see if they will power a welding positioner. To see if they also loose torque while loosing voltage.
