Help Figuring Out How Many Amps

[Hellbringer]

Hi

I am working on rebuilding a CNC mill and i am planning to reuse the servos that are installed.

The X and Y are both the same and the plate lists them as 146V DC and lists pulse amps?? not sure what that is??

The Z does not list a voltage, but seeing that it is using the same power source as the X and Y I assume it is also 146V and it lists a stall amperage as 23 amps.

Now the million dollar question is, how many amps on average will those motors pull. how big of a power supply do i need to run them? Is there a formula to calculate that?

At 140V, the largest power supply i can find is 6.6 amps, is that enough?


Thanks in advanced
Mike

Pictures of both motor plates

X&Y Motor



Z Motor



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[Jim Dawson]

My mill has similar motors (Baldor), almost the same specification. I am running 2 of those, and a 6.3 amp stepper (z-axis) on one 75V, 5 amp power supply. I can do 200 IPM rapids, but normally limit it to 100 IPM.

In actual operation, the motors draw only a fraction of their rated current.

The other alternative is to find a 120/100 volt transformer and just build your own power supply. Just need a bridge rectifier, a couple of large capacitors rated for the voltage, and a 15K or so 5 watt bleeder resistor. That will give you about 141 volts.

Something like this https://www.ebay.com/itm/Gomi-Electr....c100005.m1851

[RCaffin]

I too have DC servo motors on the axes. Under most conditions they would not draw more than 15 W each. To be sure, the motors could handle hundreds of watts, but they don't need to. 3:1 reduction motor to ball screw and 5 mm pitch ball screw.

The spindle normally draws under 0.5 A at 150 VDC. More drag there. If it draws >2 A I reduce the feed rate. I did see it hit 8 A once when drilling Titanium: that was definitely a mistake!

Cheers
Roger

[Hellbringer]

Thank you guys!!