[pock]

Hi,

I've been wanting to build a CNC router for a long time, and finally my finances are at a point that I can afford to.

I' have ordered some NEMA 23 motors (these: Wholesale Product Snapshot Product name is 3 PCS 1.8deg Nema 23 CNC Stepper Motor Bipolar 56mm 2.8A 1.26Nm(178.5oz.in) 4 Leads CNC Router Laser Grind Foam Plasma Cut ) and I found a website that had these calculations to work out the required power supply:

Voltage = 32 * sqrt( Inductance in mH )
Supply voltage should be based off your motors inductance:

Current = Amps needed per drive * Number of drives * 0.7
Current needed should be 70% of the individual amp requirement of one drive times the number of drives in your setup. Generally it is possible to run your drives from even down to 50% of the total amp requirement, but for good measure stick with 70%

I have calculated:

Voltage = 32 x sqrt of 2.5
Voltage = 32 x 1.58113883008419
Voltage = 50.59644256269407 (close enough to 50v)

Current = 2.8 (amps) * 3 (motors) * 0.7 (70%)
Current = 5.88 A

So, a 50v 6 A power supply.

I found a power supply rated 48v 7.3A. My question is, will this do? It's not quite 50v, but the current is greater, so this will compensate right?

[pock]

Well crap.

I just had a look at the specs of the stepper drivers I've ordered, and they are rated to 36v max (recommended using 24v).

So, will using a 24v power supply with a higher current output work or do I have to order different stepper drivers?

[jschmitt]

A 24v rated at 6 amp will work. The 50 volts is for max performance. With 50v the stepper should have higher top rpm than the 24v.