CNC3040Z Motor and Spindle Selection.

[vksingh]

Hi Jazz,
I am newbie to cnc and stepper world. I have gone through various forums for power supply rating for stepper motors, but could not understand.
I am using a 18V-80V and 1.2A-7.0A rated stepper driver. and the
Stepper specs are

Ph. Current			:			4.0 A
Ph. Res. (Ohm)			:			0.85
Ph. Inductance			:			3.8 mH
Holding Torque			:			32 Kg-cm
Detent Torque			:			1 kg-cm
Rotor Inertia			:			680 g-cm2
Lead Wires			:			4

rated voltage is 3.4V

I need 3Nos of stepper motor for my cnc. Now my question is what should be the rating of power supply if I am using single power power supply for all the three motors.
Can this power supply be used for the stepper drivers
800W-70V-11-4A-CNC-Switching-Power-Supply

Thanks

[Clive S]

It is generally accepted that linear p/s are better ie http://www.zappautomation.co.uk/elec...-supply-5.html I take it you already have the drivers. ..Clive

[JAZZCNC]

Like Clive says Unregulated linear supplies are considered best for CNC use but that power supply would work thou you would have to run it 70V or the lowest it can be adjusted to.

Rule of thumb for working out voltage is 20 x rated motor voltage. So 3.4 x 20 = 68Vdc. This is just general guide and in practice you can go higher depending on the motors/drives etc. Any where between 65-70vdc is about right for those motors.