On Wed, 6 Apr 2011, andy pugh wrote:
> Date: Wed, 6 Apr 2011 20:49:16 +0100
> From: andy pugh <[email protected]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] PSU
>
> And now the cap sizing.
> If I say that I can put up with 10% ripple at max rated current (7.5A
> for the motors) on a nominal 300V then I end up with
> C = 7.5A X 10mS / 30V = 2500uF.
>
> Eeek!
>
> http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5436785
>
> Is the cheapest that is even close.
>
> A thread on CNCzone said 20,000uF per amp, but I decided to ignore that.
i>
This is why 3 phase power is prefered, its always there and doesn't go on
vacation 50 (or 60) times a second!
> --
> atp
> "Torque wrenches are for the obedience of fools and the guidance of wise men"
Peter Wallace
Mesa Electronics
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