Re: [CAD_CAM_EDM_DRO] Re: Need help with servo power supply design

Hi Dave,

10 amps is the continuous current. You can safely set the peak current
much higher than that. Current gives you torque and the more available
torque the better. If you use the full 20 amps for any length of time
the motors will overheat but in normal use this will never happen as you
only need high torque when accelerating hard.

I was testing my mill earlier on today to see just how fast I could push
the motors. While cutting a complicated shape at about 160IPM the drives
cut out. In investigation I found that the Y axis fuse had blown. This
was a 2A antisurge fuse that I had fitted to be safe for testing and
completely forgotten to replace. This is a good demonstration of the
'transformer' effect of switching drives. Although the motor was
probably receiving up to 20 amps the power supply was proibably only
supplying peaks of 4A or so.

Les


turbulatordude wrote:

>OK, so, I buy a 1.5hp treadmill motor 110 volts. (1.7*746= 1,116
>watts or 10 amps)
>
>I gear it down for my plasma table, 2:1.
>assuming the power supply will be 66 volts, that is 60% of nameplate,
>so would I set the current for 10 amps for the motor maximum ? 6 amps
>for the max speed calculation ? or something in line with the power
>the table needs ?
>
>Dave
>
>