Efficient Voltage Conversion for High Amperage CNC Machines

[blakjakd]

Hi everyone,

I'm in the process of building a CNC machine. It is controlled by 3 stepper motors controlled by a driver board. Each motor uses 3A, and my board can only handle 36V.

How do I drop my 42V power supply to 30V?
-I can't find a high amperage, 30V linear regulator.
-A bunch of diodes in series to drop the voltage would not work because the current will drop when some motors are not in use.

 

[vk6kro]

You could try some of these:

http://www.ebay.com.au/itm/AC-DC-12-48V-1-5-38V-5A-Converter-Board-Step-Down-Voltage-Regulator-Module-/130590702707?pt=AU_B_I_Electrical_Test_Equipment&hash=item1e67cffc73

They are AC/ DC 12-48V to 1.5-38V 5A Converter Boards so that seems to fit in with your voltages.

About $9 each delivered.