Hello,
I am trying to make a Mineba 14PM-M004 stepper motor run using Arduino Uno and a L293D H-Bridge. I have connected the stepper and the H-Bridge to a 9V power supply. However, the stepper runs only for some time, and later it stops. I based my wiring on the Zerotope project of Arduino and tweaked it for a stepper. According to the stepper specs, it needs a 24V power supply, and I guess, that might be the reason that it doesn't run continuously.
My question is whether I could connect a 24V power supply to the Arduino instead of the 9V battery without burning the Arduino, or I should add other components or shields. Please, see the diagram attached.
Your diagram shows the 9v connected to Vs of the 293, and doesn't show it connected to the Uno. You show that you're driving the 293 Vss which is the logic supply from the Uno. It doesn't actually show the power supply to the Uno.... is it connected to the USB still?
In essence, you can replace the 9v with the 24v, since that is going to the 293 and out again to the motor. The 293 basically separates the motor side's high voltage / high current from the control side, in your case the Uno.
But no, don't put 24v into the Uno, that's for sure.
The actual specifications for the stepper motor (14PM-M004) aren't listed in the datasheet you linked.
What is the coil current specification and the winding resistance? The steady state winding current will be approximately (power supply voltage - 3) divided by the coil resistance, and that may not exceed the specified winding current on average or the motor will burn up.
Surely you weren't trying to power this motor with a 9V PP3 battery, as the diagram suggests!