Re: [CAD_CAM_EDM_DRO] Re: Question on Power Supply

Thanks Dave...as always.

These motors are going to be used a Table Top,
Dremmal Tool CNC for Wood. First CNC to get
some knowledge before making the CNC Plasma machine
I want.

I contacted the Electrical Engineer (who designed it) on the Drvier and
this was his responde to
my question on the power supply needed for this Driver and Motors.

"You will need two separate power supplies.

One for logic, regulated 5V DC (+/- 5%) 150mA min.
The second power supply will be used to provide the power to the motors.
This one doesn't have to be regulated but at the same time CANNOT be
switching type.
They don't work well with any step motors.
I would recommend the cheapest AC-to-DC LINEAR 24V DC and at least 3A per
axis. For example
if you want to run 3-axis then 9A min , for 4-axis 12A min.
The 24V is an industry standard so it will be easier to find one. The
problem is to find LINEAR power supply
with so much current. Since it doesn't have to be regulated I would use
just
transformer, bridge rectifier and
a large electrolytic capacitor. I'm assuming you are going to mount
everything in some cabinet of the machine."

A few things are still unclear, but I am hoping Mr. Robert Campbell will
make them clear.

Luke


turbulatordude wrote:

>
>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
>
>
>