Re: [CAD_CAM_EDM_DRO] Re: PowerSupply Amperage?

This explanation made me enlighted!
Alex

----- Original Message -----
From: <info@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, December 16, 2002 7:11 PM
Subject: [CAD_CAM_EDM_DRO] Re: PowerSupply Amperage?


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fusion X Studio"
> <fusionxstudio@h...> wrote:
> > They are Power-One F24-12-A, I think regulated power supplies.
> What is the
> > difference and how does it affect the machine?
> >
> > Thanks,
> >
> Nothing wrong with using regulated power supply. If it is a linear
> (big power transformer) with series pass (power transistors on the
> chassis) then you should put a large diode in series with the
> positive output rated at least 50PIV and 20A. Probably be a stud
> mount that needs mica insulators. The cathode goes towards the load
> (arrow points to the cathode end). This will keep spikes and
> transients from the motors from taking out the series pass. A
> switcher might need a larger capacitor on the output for smoothing
> out the surges.
>
> As long as you are using current limited motor drivers and you keep
> the voltage below the ratings of the drives you can use just about
> anything that gives low ripple DC. The name plate voltage on a
> stepper is just there to confuse you. They are current devices
> and "draw" current from the source based on their reactance
> (frequency dependent resistance). If you apply too much voltage to a
> stepper it will draw too much current....unless your driver limits
> the current then it just stops the pulse (woops, got enough!). Why
> would you want more than 6 volts? Well the trick to getting steppers
> to step quickly is to make the time from zero current to full rated
> current as short as possible so we hit it with more voltage.
>
> Here as in analogy: Lets say you have a bucket you want to fill and
> it only holds 1 gallon. Your source is a larger bucket setting
> slightly above it. There is a hose between them and we have a
> valve. The hose limits how fast we can transfer the water into our
> empty bucket. Now if we want to fill this empty bucket quickly
> because we have more buckets to fill, then we have to find a way to
> move the water faster. We can't make the hose larger (reluctance of
> the load) so we pick our source bucket up and set it on top of a
> ladder. Now there is more force (EMF or voltage) and the bottom
> bucket fills much faster and would quickly overflow but we have the
> valve to cut it off precisely when it reaches the top. Now we can
> start to fill the next bucket. What if we had the empty buckets on a
> wheel and by filling each one we could start the wheel rotating. The
> faster we could get the water moving and fill each bucket and the
> more water we got in each bucket the faster the wheel spins....
>
> Now if you have the patience to read the tutorial you know everything
> about current and voltage...sorta.
>
>
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