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I have successfully controlled my stepper motor with a L293D and Arduino. Now I want to add more motors (up to 3) each with it's own L293D driver. I'm using a single separate power supply for the motors. Will I need a regulator to stabilize the voltage and if yes why? The motors won't rotate/step at the same time. The motors are low powered 5V - 9V.

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  • \$\begingroup\$ Why not just use a single supply that can supply sufficient current for all of them? \$\endgroup\$ – Ignacio Vazquez-Abrams Jul 1 '16 at 19:57
  • \$\begingroup\$ Yes that is what i mean. I use a single power supply for all the motors. Do i need a regulator? \$\endgroup\$ – John Am Jul 1 '16 at 19:58
  • \$\begingroup\$ Do you understand what a regulator does? \$\endgroup\$ – Ignacio Vazquez-Abrams Jul 1 '16 at 19:59
  • \$\begingroup\$ Not really. I think if you draw more current or voltage it stabilizes the supply \$\endgroup\$ – John Am Jul 1 '16 at 20:00
  • \$\begingroup\$ @JohnAm, you might want to clarify what you mean by "work" in your statement "The [stepper] motors won't work at the same time." Current flows continuously through a stepper motor's windings when the motor is energized and the shaft is stationary or stepping/rotating. \$\endgroup\$ – Jim Fischer Jul 1 '16 at 21:07
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Without seeing the entire system, it is impossible to answer your question definitively. However, it seems UNLIKELY that you need a regulator just because of the additional stepper motors. Since they are stepper motors, they aren't very dependent on voltage anyway. And if only one will be operating at a time, then there seems like little or no benefit. Of course if there are OTHER parts of the circuit that need stable voltage, that is a different question (or at least a question broader than the one you asked.)

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