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# If I have a power supply rated at 12Volts 10Amps, would it safely run 3 stepper motors rated at 24Volts 2.8Amps? Answered

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## 4 Replies

kricketone (author)2011-01-02

Lets see here you got a 12 volt power supply and you are going to try and run three motors rated a 24 volts, hummmmm I dont see this working, your 12 volt power supply is about to be smoked

kelseymh (author)2010-12-28

Energy (or power) is conserved across a transformer. 12V*10A = 120W. Each of your stepper motors (24V, 2.8A) needs 67.2W. So you can only run 1 motor at full power at a time. If your control system switches between the motors, then you're fine. Otherwise the motors are going to get less than maximum current.

steveastrouk (author)2010-12-29

Question:
A motor with a 24V winding draws 2.8 A
1.)Calculate its resistance.
2.)Using the value calculated what current will the winding draw on 12V ?
3.) A PSU, of 12V and 10A rating is supplied. Can this feed THREE motors as described.

For full marks, show your working. Calculators may NOT be used.

Steve

steveastrouk (author)2010-12-28

It'll run 'em, just not very well, since it won't GET 2.8Amps to flow in the windings,