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#1
 
12-03-2006, 12:07 AM
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Could someone please check my math for a power supply. nema 23 500oz rex steppers,3 volt,3 amp\phase I figured I would need 68 volt dc 48 volt secondary 6 amps 120VA 10,000uf CAP 50volt rectifier @25 amp 50 volt thanks for any replies Ged  |
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#3
12-03-2006, 09:25 AM
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| If the 6 amps is for 100% duty cycle, I make that just over 500va or 340va for 60% duty, a 5500µfd min. capacitor for 5% ripple. If your DC is 68 volts your bridge will need to be higher than 50v? The cost is minimal for higher voltage, go with 100v or 150vdc PIV. Al.
__________________ CNC, Mechatronics Integration and Machine Design. “Logic will get you from A to B. Imagination will take you everywhere.” Albert E. |
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#4
12-03-2006, 10:03 AM
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| Hi Al thanks for your reply I have 3 steppers at 3v 3a\phase According to Mariss`s paper I figured 67% of 9amps is 6.03amps this is how I came up with 120va. Did I do something wrong? the motors are two phase 4 wire. Would that be 6amps for ea motor? |
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#5
12-03-2006, 10:40 AM
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| You can base the the required VA or power rating on your estimated average current draw (6amps) x 48v = minimum 300va. Al.
__________________ CNC, Mechatronics Integration and Machine Design. “Logic will get you from A to B. Imagination will take you everywhere.” Albert E. |
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