Re: Question on Power Supply

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:

> Bruce:
>
> It frustrates me there are SO many wizards "in here" who spec.

newbies'

> power-supplies, and it is clear 80% of them haven't a clue!
>
> First, you say your drivers are rated up to 30 VDC. An unregulated

28 or 30

> VDC supply WILL exceed that, at least at times, and BLOW your

drives. Use

> no more than a 24 VDC unregulated supply!

I think you missed the posts. they said to purchase a regulated PS as
it is the easiest way.

> Next, your motors have two windings drawing 1.5 A each @ 2.3 VDC.

That

> simply means each draws about 7 watts.

Reading between the lines, the DRIVER can handle 2.5 amps each. so,
considder that a larger motor(s) will be needed at some point. the
total drivers load is 7.5 amps at 30 volts max. that is 210 watts.
ASSUMING 5 volt, 2.5 amps motors are used, then the real load is 12.5
watts per phase or 25 watts, times 3 = 75 watts. so, 75 watts is the
minimum I would recomend as that is the ball-park range of a fully
powered machine.


the CURRENT motors, 2.3volts, 1.5amps = 7 watts per motor. 21 watts
for 3 axes.

But, everyone just totally bypassed the process of motor selection in
the first place !

What type of machine ? I hope the poster does not have any intention
of using these for any type of milling or drilling operations. These
tiny motors will be hard pressed to do metal work.

To just answer one question with an answer may be a bigger disservice
than to not respond at all.

Dave