Hello all.
I currently have two Sonceboz 6231 R079 bi-polar stepper motors from an electronic speedometer, wich i would like to connect to Arduino.
I've been looking for their datasheet online, but to no avail.
The only two specs i know are the 0.17 Amperes per phase rating and 70 ohms (as they're printed on the stator case).
I'm opening this thread as i need to precisely confirm just the following things:
These two stepper motors cannot be powered directly via the Arduino power supply, but need a separated external supply, correct? Given the available specs, what would be best in my case? 12v?
For bi-polar stepper motors, should i use the SN754410ne H-Bridge as listed in the arduino guide or are there other micocontrollers i should look at?
The SN54410ne is a very old bi-polar part with a high voltage drop. There are much more efficient MOSFET drivers available. Pololu (Pololu - Stepper Motor Drivers) is one provider of motor controllers. They have a confusing number of possibilities. Probably someone else on the forum has a recommendation. It has been decades since I used a stepper so my knowledge is limited to obsolete technology.
Yes, No Arduino can directly drive motors. As it has 2 coils I assume you should be able to drive it with a A4988 driver / equivalent or more modern driver. Use a cooling element as these drivers might get hot.
The global spec above states 0.17-0.34 Amps and the R = 70 Ohm => 0.17 * 70
So 12V should work.
No, I don't see a problem with that, provided the power supply is adequately rated.
I would be more worried about powering the Arduino with 12V. Depending on the model you use (you forgot to mention that), pulling more than a small current from the 5V pin can overload the Arduino's regulator.
What does Ohm's law tell you, knowing the current and coil resistance?
+1
There is a Switec library for those motors, and they can be driven directly from Arduino pins.
I managed to drive four of those motors directly from a single Nano v3.
No drivers needed.
Those drivers are for high current/low impedance motors. Op has high impedance (70 Ohm) motors.
If torque at high speed is not required, then they can be driven with common (mosfet) H-bridges, powered with 12volt.. The TB6612 is a good option. They are used on the Adafruit shield I mentioned.
IMO these are well worth looking into - only 2 wire connection to the processor - one sets direction, the other you pulse to move it . No library required .
