Re: Control of AC motor in antenna rotor

Roland Jollivet wrote:
> There is the wiki on it, but even that does not explain it properly. If you
> have a look at this;
> 
> http://www.pcrite.com/store/product_info.php?cPath=24&products_id=360
> 

You don't put serious servers on such a UPS. I was thinking about smart
UPS that power one or more larger systems in computer rack.

> which is typical of what you find in a computer store, you will find a
> single, underrated inductor inside. During normal use, the PC is powered
> directly, and the the battery is kept topped up by one winding. When the
> mains fails, relays kick in, and inverter runs, using the same power
> inductor, but other windings. Usually only for a few min otherwise the
> inductor would overheat(been there). When mains restores, it takes up to 8
> hours to recharge the battery. They really are designed for an unlikely
> power outage.
> 
> But...... I'm not sure what power rating you are thinking of, or what
> country you are in. When I say 'most', I mean the units you find here;
> 
> http://www.walmart.be/english/products/oneCategoryProducts.asp?cat=48&catName=UPS
> 

You won't find this useful for powering a large computer center where
min of 5 to 10 kW is needed. My guess is we were thinking about
different systems based on previous experience.

> which are usually chinese made.