On Tue, 2012-11-20 at 19:08 +0200, Viesturs Lācis wrote:
> 2012/11/20 andy pugh <[email protected]>:
> > On 20 November 2012 11:23, <[email protected]> wrote:
> >
> >> I see a great many lower priced switching supplies
> >
> > Possibly because a motor power supply contains too few components to
> > bother selling as a unit.
> > A transformer, rectifier and capacitor is all that is needed. And the
> > transformer may be optional.
>
> For my last 3 machines I used ~1kW transformer with 220VAC input and
> 20VAC output, which gives ~28 VDC after rectification. My current
> build has 800W transformer with 20VAC output, that machine has 2 7i39
> drives, 10A for each motor is 40A total. That is what transformer
> rated for, but I am now curious to find out, if capacitors, when they
> will be charged, will not actually draw a lot more current. What do
> others think about it? How can I calculate that?
>
> BTW those are custom-made for me torroidal transformers by a company
> in Poland. The 1kW transformer cost me 200EUR, including shipping, the
> 800W was 150EUR. I managed to burn down 50A rectifier bridge (despite
> the heatsink), but I was not able to feel by hand that transformer had
> warmed even a little. They work really great.
> If anyone ever needs, let me know, I can pass their contacts.
Avel Lindberg Inc., United States
47 South End Plaza
New Milford, Connecticut 06776
USA
E-Mail: [email protected]
Tel: (860) 355 4711
Fax: (860) 354 8597
Avel Lindberg, Europe
Arisdale Avenue
Unit 6 Sirhowy Industrial Park
Tredegar
Gwent NP22 4QZ
United Kingdom
E-Mail: [email protected]
Tel: 01495 722233
Fax: 01495 722244
I've had good luck with these guys. Price on their 25v-25v 20 A
was about 142 USD. No idea what the Brit price might be.
http://www.avellindberg.com/transformers/toroidal_transformers_index.htm
YMMV
Dave
>
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