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#1
07-30-2004, 01:10 PM
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driver When designing a power supply, is one to look at phase current or rated current of stepper motor? ex. 2 phase motor rated at 5v 3amps. Lets say a three axis machine. Would I design my power supply for 3amps x 3=9amps or would it be 3amps x 2phase=6amps x 3 motors= 18 amps.I understand that depending on the driver I use will make a difference on the percentage of amps to use in the calc., something like 67% of total amps(ex. a chopper drive). What about without a chopper drive, should I go with the total amps + 20% to cover all bases? I seem to be using a basic bipolar drive. The one on electrokits.com Last edited by FLUTE HEAD; 07-30-2004 at 03:02 PM. Reason: link  |
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#2
07-30-2004, 02:36 PM
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| With that drive, yes, add up all the amps for each phase. 3a/phase times 2 phases/motor = 6 amps times 3 motors = 18 amps. I'd maket it at least 20. If you used Gecko's, on the other hand, you'd only need about 6 amps. You'll be wasting a LOT of power through your resistors.
__________________ Gerry Mach3 2010 Screenset http://home.comcast.net/~cncwoodworker/2010.html (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |
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#3
07-31-2004, 08:40 AM
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| ALSO, What is the amp rating refering to on most stepper motors(per phase amps or total amps)? |
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#4
07-31-2004, 12:41 PM
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| per phase
__________________ Gerry Mach3 2010 Screenset http://home.comcast.net/~cncwoodworker/2010.html (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |
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