Thread: PSU size calculation
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19-05-2020 #1
Hi
I need to source a PSU and am confused about the size calculations as I have limited experience.
I intend to run 4 x Nema 24 closed loop motors, 4Nm, 5.0A, 2.5mH inductance. I want to run these at best performance and understand that the inductance als needs to be considers. So I calculate
1. Square root of 2.6 x 32 = 51V, so at least a 48V PSU
AND a second recommended calculation is
2. P= 4 x 5 x 48 x 1.2 = 1 152W
But it seems most 48V PSU's deliver 350 - 400W at 7-8A.
1. Since the PSU's are rated at 7A, do I need 1 x PSU per stepper motor since more than 1 motor will exceed the A rating?
2. Since the PSU's are rated 400W, do I need 1 x PSU per stepper motor since more than 1 motor will exceed the W rating?
Knowledge, experience and constructive critique welcomed!
Ian
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