Strange Electrical Noise From Stepper Motor

What you are hearing is the effect of actually stepping the current. A sharp change in current produces a sharp change in the forces acting on the motor structure, which produces a certain amount of acoustical output. It's not quite the same as hitting it with a hammer (it's a step, not a pulse) but the idea is the same. If you listen closely, you will realize that the pitch of the sound you hear is determined by the stepping rate of your driver. If you vary the step rate, the pitch will change as well. The effect is not "pure", since the excitation (a step) produces lots of harmonics. If you replace your steppers with a pair of sine wave drivers, 90 degrees out of phase, you can get rotation which is essentially silent

1. Stepper Motor Not Responding. Wiring Issue?

Nope. Not wiring issue. Double check if you got the exact same chip in the tutorial. If so, it's probably a software problem. Try running the program as root

2. Smallest stepper motor (that one could buy)

You could take a look at The world's smallest stepper motor at elabz. They can be found inside BluRay drives, so might be a little on the expensive side if you want a bunch of them.Also, do not forget that if you want to reduce the power consumption of your stepper motor, you have a couple of options.

3. Simple Stepper motor for my experiment?

I would recommend tweaking your choice of independent variable slightly. I would consider each coil to be either ON, OFF, or ON(Reversed). I would then consider which coils are energized to be the independent variable.I think this is a great experiment. You should be able to build a working model similar to the diagram you posted. You can use toggle switches to control the coils and "step" the motor.A DPDT toggle switch can be hooked up so that middle is off, up is current in one direction, and down is current in the opposite direction. See here.

4. One stepper motor of two getting really hot

The L293D is only a driver that switches the supplied voltage to the load (motor). It has no current control, like chopper,... So basically when the motor is at standstill the current is limited only by its winding resistance. If it is spinning then the current is lower, since the back EMF voltage builds up: $$V_supp = Icdot RV_BEMF $$ $$I=dfracV_supp-V_BEMFR$$ $$V_BEMF=k_ecdot N_RPM$$ therefore at N=0:$$I=dfracV_suppR$$

5. RPi restarts when driving 28BYJ-48 (ULN2003) stepper motor through LM2577 Step-up converter module

You should not be running the power for a stepper motor (or any other moderately hi or pulsed load) through the pi, period. At the least give the load its own wiring directly back to the supply.While it is true that higher voltage supplies can yield much better stepper motor performance, a boost converter is going to be a poor way to do this. If you want to run your motor at 12v (say with a chopping driver) you should use a 12v supply, not one upconverted from a lower voltage where higher current would be required.If you have a good supply in the 12v range you could consider using a buck regulator to also power your pi from it, but you may find it simpler to use independent supplies for the pi and motors driver

6. Difference between stepper motor and servo motor - Thunder Laser

Do you know the difference between stepper motor and servo motor? Now thunder laser will show you the difference by using our Lite model laser cutter (stepper motors) and our Plus model laser cutter (servo motors). Seeing is believing, you can compare the difference from the video directly.

7. Debugging my Stepper Motor Driver circuit

I had this same issue when setting up this circuit with this code and driver on an Arduino Uno. All else was fine, but the current for the motor was set WAY too high on the driver from the factory. The VREF was 1.7 volts, and it needed to be around .5 for the motor I was using. As I set the VREF to the appropriate voltage, the motor started to spin as it should and stopped hissing. I know this post is old, but I hope that this helps someone else. Pololu has a great video (and documentation in general) for setting the appropriate voltage on most of their drivers on the product page here: DRV8825 Stepper Motor Driver Carrier, High Current

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