Hi,
I am want to build a cnc with 4 Stepper Motors(http://www.sparkfun.com/commerce/produc … ts_id=9238) - I use two for the X-Axis.
I will control them with an Arduino Mega and 4 Easy Driver v4.2(http://www.sparkfun.com/commerce/produc … ts_id=9402). And now to my question can I operate the 4 Stepper Motors at the Rated Current and Voltage with the 12V Powesupply (http://www.sparkfun.com/commerce/produc … ts_id=9442) ?
Stepper Motor:
Power Supply:
No.
4 times 0.33 Amps is 1.32 Amps.
It is also good to use a power supply of about twice the expected current draw so look for a 12V 3Amp (or more) power supply.
Pyramid makes a number of inexpensive power supplies.
This one would work.
If you run the motor at a max of 0.33A per phase, when you reach a step where you are half way between 2 full steps, you will draw 70.71% of that current on each phase (as per the datasheet of the A3967 driver IC). That gives you a total of 0.47A per motor so you are looking at about 2A of current at maximum power.
The power supply that waltr suggested will still be suitable.
-Bill
I think that I’m going to use a ATX computer power supply.
Thanks for your help.
-yama